10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

001-3034	41-0448030
(Commission File Number)	(I.R.S. Employer Identification No.)

(Registrant, State of Incorporation or Organization, Address of Principal Executive Officers and Telephone Number)

Xcel Energy Inc.

(a Minnesota corporation)

414 Nicollet Mall

Minneapolis, MN 55401

612-330-5500

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Stock, $2.50 par value per share	Nasdaq Stock Market LLC
Securities registered pursuant to section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. x Yes ¨ No

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. ¨ Yes x No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. x Yes ¨ No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 and Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). x Yes ¨ No

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulations S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. x Large accelerated filer ¨ Accelerated filer ¨ Non-accelerated filer ¨ Smaller Reporting Company ¨ Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). ¨ Yes x No

As of June 29, 2018, the aggregate market value of the voting common stock held by non-affiliates of the Registrants was $23,246,479,826 and there were 508,898,420 shares of common stock outstanding.

As of Feb. 14, 2019, there were 514,211,368shares of common stock outstanding, $2.50 par value.

DOCUMENTS INCORPORATED BY REFERENCE

The Registrant’s Definitive Proxy Statement for its 2019 Annual Meeting of Shareholders is incorporated by reference into Part III of this Form 10-K.

1

TABLE OF CONTENTS

PART I
Item 1 —	Business	3
	ABBREVIATIONS AND INDUSTRY TERMS	3
	COMPANY OVERVIEW	5
	ELECTRIC UTILITY OPERATIONS	8
	Electric Operating Statistics	8
	NSP-Minnesota	11
	NSP-Wisconsin	12
	PSCo	13
	SPS	14
	NATURAL GAS UTILITY OPERATIONS	15
	Natural Gas Operating Statistics	15
	NSP-Minnesota	16
	NSP-Wisconsin	16
	PSCo	16
	SPS	16
	GENERAL	16
	ENVIRONMENTAL MATTERS	17
	CAPITAL SPENDING AND FINANCING	17
	EMPLOYEES	17
	EXECUTIVE OFFICERS	18
Item 1A —	Risk Factors	19
Item 1B —	Unresolved Staff Comments	23
Item 2 —	Properties	24
Item 3 —	Legal Proceedings	25
Item 4 —	Mine Safety Disclosures	25
PART II
Item 5 —	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	25
Item 6 —	Selected Financial Data	26
Item 7 —	Management’s Discussion and Analysis of Financial Condition and Results of Operations	26
Item 7A —	Quantitative and Qualitative Disclosures About Market Risk	43
Item 8 —	Financial Statements and Supplementary Data	43
Item 9 —	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	78
Item 9A —	Controls and Procedures	78
Item 9B —	Other Information	78
PART III
Item 10 —	Directors, Executive Officers and Corporate Governance	78
Item 11 —	Executive Compensation	78
Item 12 —	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	78
Item 13 —	Certain Relationships and Related Transactions, and Director Independence	78
Item 14 —	Principal Accountant Fees and Services	78
PART IV
Item 15 —	Exhibits, Financial Statement Schedules	79
Item 16 —	Form 10-K Summary	85
SIGNATURES		86

2

PART I

Item 1 — Business

ABBREVIATIONS AND INDUSTRY TERMS

Xcel Energy Inc.’s Subsidiaries and Affiliates (current and former)
Capital Services	Capital Services, LLC
Eloigne	Eloigne Company
e prime	e prime inc.
NCE	New Century Energies, Inc.
NSP-Minnesota	Northern States Power Company, a Minnesota corporation
NSP System	The electric production and transmission system of NSP-Minnesota and NSP-Wisconsin operated on an integrated basis and managed by NSP-Minnesota
NSP-Wisconsin	Northern States Power Company, a Wisconsin corporation
Operating companies	NSP-Minnesota, NSP-Wisconsin, PSCo and SPS
PSCo	Public Service Company of Colorado
SPS	Southwestern Public Service Co.
Utility subsidiaries	NSP-Minnesota, NSP-Wisconsin, PSCo and SPS
WGI	WestGas InterState, Inc.
WYCO	WYCO Development, LLC
Xcel Energy	Xcel Energy Inc. and its subsidiaries

Federal and State Regulatory Agencies
CPUC	Colorado Public Utilities Commission
D.C. Circuit	United States Court of Appeals for the District of Columbia Circuit
DOC	Minnesota Department of Commerce
DOE	United States Department of Energy
DOJ	Department of Justice
DOT	United States Department of Transportation
EPA	United States Environmental Protection Agency
FERC	Federal Energy Regulatory Commission
Fifth Circuit	United States Court of Appeals for the Fifth Circuit
IRS	Internal Revenue Service
Minnesota District Court	U.S. District Court for the District of Minnesota
MPSC	Michigan Public Service Commission
MPUC	Minnesota Public Utilities Commission
NDPSC	North Dakota Public Service Commission
NERC	North American Electric Reliability Corporation
Ninth Circuit	U.S. Court of Appeals for the Ninth Circuit
NMPRC	New Mexico Public Regulation Commission
NRC	Nuclear Regulatory Commission
OAG	Minnesota Office of the Attorney General
PHMSA	Pipeline and Hazardous Materials Safety Administration
PSCW	Public Service Commission of Wisconsin
PUCT	Public Utility Commission of Texas
SDPUC	South Dakota Public Utilities Commission
SEC	Securities and Exchange Commission
TCEQ	Texas Commission on Environmental Quality

Electric, Purchased Gas and Resource Adjustment Clauses
CIP	Conservation improvement program
DCRF	Distribution cost recovery factor
DSM	Demand side management
DSMCA	Demand side management cost adjustment
ECA	Retail electric commodity adjustment

EE	Energy efficiency
EECRF	Energy efficiency cost recovery factor
EIR	Environmental improvement rider
FCA	Fuel clause adjustment
FPPCAC	Fuel and purchased power cost adjustment clause
GCA	Gas cost adjustment
GUIC	Gas utility infrastructure cost rider
PCCA	Purchased capacity cost adjustment
PCRF	Power cost recovery factor
PGA	Purchased gas adjustment
PSIA	Pipeline system integrity adjustment
RDF	Renewable development fund
RER	Renewable energy rider
RES	Renewable energy standard
RESA	Renewable energy standard adjustment
SCA	Steam cost adjustment
SEP	State energy policy rider
TCA	Transmission cost adjustment
TCR	Transmission cost recovery adjustment
TCRF	Transmission cost recovery factor
WCA	Windsource® cost adjustment

Other
AFUDC	Allowance for funds used during construction
ALJ	Administrative law judge
APBO	Accumulated postretirement benefit obligation
ARAM	Average rate assumption method
ARO	Asset retirement obligation
ASC	FASB Accounting Standards Codification
ASU	FASB Accounting Standards Update
ATM	At-the-market
ATRR	Annual transmission revenue requirement
BART	Best available retrofit technology
Boulder	City of Boulder, CO
C&I	Commercial and Industrial
CAPM	Capital Asset Pricing Model
CACJA	Clean Air Clean Jobs Act
CAISO	California Independent System Operator
CapX2020	Alliance of electric cooperatives, municipals and investor-owned utilities in the upper Midwest involved in a joint transmission line planning and construction effort
CBA	Collective-bargaining agreement
CCR	Coal combustion residuals
CCR Rule	Final rule (40 CFR 257.50 - 257.107) published by the EPA regulating the management, storage and disposal of CCRs as a nonhazardous waste
CDD	Cooling degree-days
CEP	Colorado Energy Plan
CIG	Colorado Interstate Gas Company, LLC
CO2	Carbon dioxide
Corps	U.S. Army Corps of Engineers
CPCN	Certificate of public convenience and necessity
CPP	Clean Power Plan
CWA	Clean Water Act

3

CWIP	Construction work in progress
DCF	Discounted Cash Flows
DECON	Decommissioning method where radioactive contamination is removed and safely disposed at a requisite facility, or decontaminated to a permitted level.
DRC	Development Recovery Company
DRIP	Dividend Reinvestment Program
EEI	Edison Electric Institute
ELG	Effluent limitations guidelines
EMANI	European Mutual Association for Nuclear Insurance
EPS	Earnings per share
EPU	Extended power uprate
ERP	Electric resource plan
ETR	Effective tax rate
FASB	Financial Accounting Standards Board
FTR	Financial transmission right
GAAP	Generally accepted accounting principles
GE	General Electric
GHG	Greenhouse gas
HDD	Heating degree-days
HTY	Historic test year
IM	Integrated market
IPP	Independent power producing entity
IRC	Internal Revenue Code
IRP	Integrated Resource Plan
ISFSI	Independent Spent Fuel Storage Installation
ITC	Investment Tax Credit
JOA	Joint operating agreement
LCM	Life cycle management
LLW	Low-level radioactive waste
LSP Transmission	LSP Transmission Holdings, LLC
Mankato 1	Mankato Energy Center, LLC
Mankato 2	Mankato Energy Center II, LLC
MDL	Multi-district litigation
MGP	Manufactured gas plant
MISO	Midcontinent Independent System Operator, Inc.
Moody’s	Moody’s Investor Services
NAAQS	National Ambient Air Quality Standard
Native load	Demand of retail and wholesale customers that a utility has an obligation to serve under statute or contract
NAV	Net asset value
NEIL	Nuclear Electric Insurance Ltd.
NETO	New England Transmission Owners
NOL	Net operating loss
NOX	Nitrogen oxide
O&M	Operating and maintenance
OATT	Open Access Transmission Tariff
OCC	Office of Consumer Counsel
Opinion 531	Methodology for calculating base ROE adopted by the FERC in June 2014
Paris Agreement	Establishes a framework for GHG mitigation actions by all countries (“nationally determined contributions”)
PI	Prairie Island nuclear generating plant
PJM	PJM Interconnection, LLC

PM	Particulate matter
Post-65	Post-Medicare
PPA	Purchased power agreement
Pre-65	Pre-Medicare
PRP	Potentially responsible party
PTC	Production tax credit
QF	Qualifying facilities
R&E	Research and experimentation
REC	Renewable energy credit
RFP	Request for proposal
ROE	Return on equity
ROFR	Right-of-first-refusal
RPS	Renewable portfolio standards
RTO	Regional Transmission Organization
Standard & Poor’s	Standard & Poor’s Ratings Services
SAB	Staff Accounting Bulletin
SAB 118	Income Tax Accounting Implications of the Tax Cuts and Jobs Act
SERP	Supplemental executive retirement plan
SMMPA	Southern Minnesota Municipal Power Agency
SO2	Sulfur dioxide
SPP	Southwest Power Pool, Inc.
SSL	Statistically significant increase over established groundwater standards
TCEH	Texas Competitive Energy Holdings
TCJA	2017 federal tax reform enacted as Public Law No: 115-97, commonly referred to as the Tax Cuts and Jobs Act
THI	Temperature-humidity index
TOs	Transmission owners
TransCo	Transmission-only subsidiary
TSR	Total shareholder return
VaR	Value at Risk
VIE	Variable interest entity
WOTUS	Waters of the U.S.

Measurements
Bcf	Billion cubic feet
KV	Kilovolts
KWh	Kilowatt hours
MMBtu	Million British thermal units
MW	Megawatts
MWh	Megawatt hours

4

Forward-Looking Statements

Except for the historical statements contained in this report, the matters discussed herein are forward-looking statements that are subject to certain risks, uncertainties and assumptions. Such forward-looking statements, including the 2019 EPS guidance, long-term EPS and dividend growth rate, as well as assumptions and other statements are intended to be identified in this document by the words “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “objective,” “outlook,” “plan,” “project,” “possible,” “potential,” “should,” “will,” “would” and similar expressions. Actual results may vary materially. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information. The following factors, in addition to those discussed elsewhere in this Annual Report on Form 10-K for the fiscal year ended Dec. 31, 2018 (including the items described under Factors Affecting Results of Operations; and the other risk factors listed from time to time by Xcel Energy Inc. in reports filed with the SEC, including “Risk Factors” in Item 1A of this Annual Report on Form 10-K hereto), could cause actual results to differ materially from management expectations as suggested by such forward-looking information: changes in environmental laws and regulations; climate change and other weather, natural disaster and resource depletion, including compliance with any accompanying legislative and regulatory changes; ability of subsidiaries to recover costs from customers; reductions in our credit ratings and the cost of maintaining certain contractual relationships; general economic conditions, including inflation rates, monetary fluctuations and their impact on capital expenditures and the ability of Xcel Energy Inc. and its subsidiaries to obtain financing on favorable terms; availability or cost of capital; our customers’ and counterparties’ ability to pay their debts to us; assumptions and costs relating to funding our employee benefit plans and health care benefits; our subsidiaries’ ability to make dividend payments; tax laws; operational safety, including our nuclear generation facilities; successful long-term operational planning; commodity risks associated with energy markets and production; rising energy prices; costs of potential regulatory penalties; effects of geopolitical events, including war and acts of terrorism; cyber security threats and data security breaches; fuel costs; and employee work force and third party contractor factors.

Where To Find More Information

Xcel Energy’s website address is www.xcelenergy.com. Xcel Energy makes available, free of charge through its website, its annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and all amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 as soon as reasonably practicable after the reports are electronically filed with or furnished to the SEC. The SEC maintains an internet site that contains reports, proxy and information statements, and other information regarding issuers that file electronically at http://www.sec.gov.

COMPANY OVERVIEW

Xcel Energy Inc. and its subsidiaries (“Xcel Energy” or the “Company”) is a major U.S. regulated electric and natural gas delivery company which serves customers in eight mid-western and western states, including portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. The Company provides a comprehensive portfolio of energy-related products and services to approximately 3.6 million electric customers and 2.0 million natural gas customers through four operating companies (e.g., NSP-Minnesota, NSP-Wisconsin, PSCo and SPS).

Xcel Energy‘s vision is to be the preferred and trusted provider of the energy our customers need and we strive to provide our investors an attractive total return value proposition and customers with safe, clean and reliable energy services at a competitive price. This mission is enabled via three key strategic priorities:

• Lead the clean energy transition;

• Enhance the customer experience; and,

• Keep the bills low.

Xcel Energy is an environmental leader and in 2018 was the first major utility in the nation to announce a vision to serve all customers with 100% zero-carbon emissions by 2050. The Company is also implementing the nation’s largest multi-state wind plan with 12 new, low-cost wind farms across seven states. By leading the clean energy transition, we have positioned ourselves to create economic development for the communities and customers we serve.

See Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations — Management’s Strategic Priorities for further discussion.

* Holding company incorporated under the laws of Minnesota in 1909 and its executive offices are located at 414 Nicollet Mall, Minneapolis, MN 55401.

5

NSP-Minnesota

NSP-Minnesota conducts business in Minnesota, North Dakota and South Dakota and has electric operations in all three states including the generation, purchase, transmission, distribution and sale of electricity as managed on the NSP System. NSP-Minnesota also purchases, transports, distributes and sells natural gas to retail customers and transports customer-owned natural gas in Minnesota and North Dakota.

	NSP-Minnesota
	Electric customers	1.5 million
	Natural gas customers	0.5 million
	Consolidated earnings contribution	35% to 45%
	Total assets	$18.5 billion
	Electric generating capacity	7,530 MW
	Gas storage capacity	14.7 Bcf

NSP-Wisconsin

NSP-Wisconsin conducts business in Wisconsin and Michigan and generates, transmits, distributes and sells electricity as managed on the NSP System. NSP-Wisconsin also purchases, transports, distributes and sells natural gas to retail customers and transports customer-owned natural gas.

	NSP-Wisconsin
	Electric customers	0.3 million
	Natural gas customers	0.1 million
	Consolidated earnings contribution	5% to 10%
	Total assets	$2.7 billion
	Electric generating capacity	563 MW
	Gas storage capacity	3.6 Bcf

6

PSCo

PSCo conducts business in Colorado and generates, purchases, transmits, distributes and sells electricity in addition to purchasing, transporting, distributing and selling natural gas to retail customers and transporting customer-owned natural gas.

	PSCo
	Electric customers	1.5 million
	Natural gas customers	1.4 million
	Consolidated earnings contribution	35% to 45%
	Total assets	$17.3 billion
	Electric generating capacity	5,685 MW
	Gas storage capacity	27.1 Bcf

SPS

SPS conducts business in Texas and New Mexico and generates, purchases, transmits, distributes and sells electricity.

	SPS
	Electric customers	0.4 million
	Consolidated earnings contribution	15% to 20%
	Total assets	$6.7 billion
	Electric generating capacity	4,406 MW

7

ELECTRIC UTILITY OPERATIONS

Electric Operating Statistics

	Year Ended Dec. 31
	2018			2017			2016
Electric sales (Millions of KWh)
Residential	25,518			24,216			24,726
Large C&I	28,686			27,951			27,664
Small C&I	36,308			35,493			35,830
Public authorities and other	1,071			1,055			1,103
Total retail	91,583			88,715			89,323
Sales for resale	24,199			18,349			18,694
Total energy sold	115,782			107,064			108,017
Number of customers at end of period
Residential	3,117,262			3,082,974			3,053,732
Large C&I	1,253			1,241			1,228
Small C&I	436,836			433,883			432,012
Public authorities and other	69,794			69,376			68,935
Total retail	3,625,145			3,587,474			3,555,907
Wholesale	70			58			52
Total customers	3,625,215			3,587,532			3,555,959
Electric revenues (Millions of Dollars)
Residential	$	3,006		$	2,975		$	2,966
Large C&I	1,696			1,779			1,707
Small C&I	3,343			3,463			3,328
Public authorities and other	136			143			140
Total retail	8,181			8,360			8,141
Wholesale	801			719			693
Other electric revenues	737			597			666
Total electric revenues	$	9,719		$	9,676		$	9,500
KWh sales per retail customer	25,263			24,729			25,120
Revenue per retail customer	$	2,257		$	2,330		$	2,289
Residential revenue per KWh		11.78	¢		12.29	¢		11.99	¢
Large C&I revenue per KWh	5.91			6.36			6.17
Small C&I revenue per KWh	9.21			9.76			9.29
Total retail revenue per KWh	8.93			9.42			9.11
Wholesale revenue per KWh	3.31			3.92			3.71

8

Energy Sources 2018

*Distributed generation from the Solar*Rewards^® program is not included (approximately 432 million KWh for 2018).

Energy Source Statistics

	Xcel Energy		NSP System		PSCo		SPS
2018
Owned Generation	67	%	77	%	70	%	49	%
Purchased Generation	33		23		30		51
	100	%	100	%	100	%	100	%
2017
Owned Generation	66	%	75	%	70	%	47	%
Purchased Generation	34		25		30		53
	100	%	100	%	100	%	100	%

Renewable Sources

Xcel Energy’s renewable energy portfolio includes wind, hydroelectric, biomass and solar power from both owned generating facilities and PPAs. As of Dec. 31, 2018, each utility or system was in compliance with their applicable RPS. Renewable percentages will vary year over year based on local weather, system demand and transmission constraints.

NSP System

Renewable energy as a percentage of the NSP System’s total:

	2018		2017
Wind	16.4	%	18.3	%
Hydroelectric	5.8		6.3
Biomass and solar	4.8		4.2
Renewable	27.0	%	28.8	%

Wind —The NSP System has more than 130 PPAs ranging from under one MW to more than 200 MW. The NSP System owns and operates five wind farms with 840 MW, net, of capacity.

• The NSP System had approximately 2,550 MW and 2,600 MW of wind energy on its system at the end of 2018 and 2017, respectively.

• Average cost per MWh of wind energy under existing PPAs was approximately $44 for 2018 and 2017.

• Average cost per MWh of wind energy from owned generation was approximately $37 and $42 for 2018 and 2017, respectively.

PSCo

Renewable energy as a percentage of PSCo’s total:

	2018		2017
Wind	23.8	%	23.7	%
Hydroelectric and solar	3.6		3.9
Renewable	27.4	%	27.6	%

Wind — PSCo has 19 PPAs ranging from two MW to over 300 MW. PSCo owns and operates the Rush Creek wind farm which has 600 MW, net, of capacity.

• PSCo had approximately 3,160 MW and 2,560 MW of wind energy on its system at the end of 2018 and 2017, respectively.

• Average cost per MWh of wind energy under these contracts was approximately $43 and $42 for 2018 and 2017, respectively.

• Rush Creek became operational in December 2018. The 2019 average cost per MWh is expected to be $29.

SPS

Renewable energy as a percentage of SPS’ total:

	2018		2017
Wind	19.1	%	21.2	%
Solar	2.0		2.8
Renewable	21.1	%	24.0	%

Wind — SPS has 18 PPAs with facilities ranging from under one MW to 250 MW.

• SPS had approximately 1,565 MW and 1,500 MW of wind energy on its system at the end of 2018 and 2017, respectively.

• Average cost per MWh of wind energy under the IPP contracts and QF tariffs was approximately $26 and $27 for 2018 and 2017, respectively.

• In 2018, SPS began construction on the Sagamore and Hale County wind farms. Refer to the SPS Wind Development section for further information.

9

Non-Renewable Sources

Delivered cost per MMBtu of each significant category of fuel consumed for owned electric generation and the percentage of total fuel requirements represented by each category of fuel:

	Coal (a)				Nuclear				Natural Gas
	Cost		Percent		Cost		Percent		Cost		Percent
NSP System
2018	$	2.13	42	%	$	0.80	45	%	$	3.87	13	%
2017	2.08		45		0.78		45		4.10		10
PSCo
2018	1.45		62		—		—		3.74		38
2017	1.56		70		—		—		3.82		30
SPS
2018	2.04		56		—		—		2.24		44
2017	2.18		74		—		—		3.39		26

^(a)  Includes refuse-derived fuel and wood for the NSP System.

Weighted average cost per MMBtu of all fuels for owned electric generation:

	NSP System		PSCo		SPS
2018	$	1.78	$	2.33	$	2.13
2017	1.72		2.25		2.50

See Items 1A and 7 for further information.

Coal — Inventory maintained (in days):

	Normal	Dec. 31, 2018 Actual	Dec. 31, 2017 Actual (a)
NSP System	35 - 50	47	53
PSCo	35 - 50	48	48
SPS	35 - 50	44	52

^(a)  Milder weather, purchase commitments and low power and natural gas prices impacted coal inventory levels.

Coal requirements (in million tons):

	2018	2017
NSP System	7.8	8.0
PSCo	9.4	10.0
SPS	5.1	5.5

Coal supply as a percentage of requirements (in million tons) for 2019:

	Contracted Coal Supply		2019 Estimated Requirements
NSP System(a)	76%	(b)	8.4
PSCo(a)	83		8.4
SPS(a)	64		4.1

^(a)  The general coal purchasing objective is to contract for approximately 75% of first year requirements, 40% of year two requirements and 20% of year three requirements.

^(b)  Increase in estimated million tons was due to lower delivered coal prices at Sherco in January 2019, combined with higher future forecasted gas prices for 2019 (higher burn forecast).

Contracted coal transportation as a percentage of requirements in 2019 and 2020:

	2019	2020
NSP System	100%	100%
PSCo	100	100
SPS	100	100

Natural Gas — Natural gas supplies, transportation and storage services for power plants are procured to provide an adequate supply of fuel. Remaining requirements are procured through a liquid spot market. Generally, natural gas supply contracts have variable pricing that is tied to natural gas indices. Natural gas supply and transportation agreements include obligations for the purchase and/or delivery of specified volumes or payments in lieu of delivery.

Contracts and commitments at Dec. 31:

	NSP System				PSCo				SPS
(Millions of Dollars)	Gas Supply		Gas Transportation and Storage (a)		Gas Supply (b)		Gas Transportation and Storage (a)		Gas Supply		Gas Transportation and Storage (a)
2018	$	—	$	406	$	412	$	589	$	20	$	152
2017	—		398		545		620		11		191
Year of Expiration	N/A		2020 - 2037		2021 - 2023		2019 - 2040		One year or less		2019 - 2033

^(a)  For incremental supplies, there are limited on-site fuel storage facilities, with a primary reliance on the spot market.

^(b)  Majority of natural gas supply under contract is covered by a long-term agreement with Anadarko Energy Services Company and the balance of natural gas supply contracts have variable pricing features tied to changes in various natural gas indices. PSCo hedges a portion of that risk through financial instruments. See Note 10 to the consolidated financial statements for further information.

Nuclear — NSP-Minnesota secures contracts for uranium concentrates, uranium conversion, uranium enrichment and fuel fabrication to operate its nuclear plants. The contract strategy involves a portfolio of spot purchases and medium and long-term contracts for uranium concentrates, conversion services and enrichment services with multiple producers and with a focus on diversification to minimize potential impacts caused by supply interruptions due to geographical and world political issues.

• Current nuclear fuel supply contracts cover 100% of uranium concentrates requirements through 2021 and approximately 51% of the requirements for 2022 - 2033.

• Current contracts for conversion services cover 100% of the requirements through 2021 and approximately 43% of the requirements for 2022 - 2033.

• Current enrichment service contracts cover 100% of the requirements through 2025 and approximately 19% of the requirements for 2026 - 2033.

Fabrication services for Monticello and PI are 100% committed through 2030 and 2027, respectively. 

NSP-Minnesota expects sufficient uranium concentrates, conversion services and enrichment services to be available for the requirements of its nuclear generating plants. Some exposure to market price volatility will remain due to index-based pricing structures contained in supply contracts.

See Item 7 for further information.

10

Capacity and Demand

Uninterrupted system peak demand and date for the regulated utilities:

	System Peak Demand (in MW)
	2018		2017
NSP System  (a)	8,927	June 29	8,546	July 17
PSCo (a)	6,718	July 10	6,671	July 19
SPS (a)	4,648	July 19	4,374	July 26

^(a)  Peak demand typically occurs in the summer. The increase in peak load from 2017 to 2018 is partly due to warmer weather in 2018.

NSP-Minnesota

Public Utility Regulation

Summary of Regulatory Agencies and Areas of Jurisdiction — Retail rates, services and other aspects of NSP-Minnesota’s operations are regulated by the MPUC, NDPSC and SDPUC. The MPUC also has regulatory authority over security issuances, certain property transfers, mergers, dispositions of assets and transactions between NSP-Minnesota and its affiliates. In addition, the MPUC reviews and approves NSP-Minnesota’s IRPs for meeting future energy needs. In addition, MPUC certifies the need and siting for generating plants greater than 50 MW and transmission lines greater than 100 KV that will be located within the state. The NDPSC and SDPUC have regulatory authority over generation and transmission facilities, along with the siting and routing of new generation and transmission facilities in North Dakota and South Dakota, respectively.

NSP-Minnesota is subject to the jurisdiction of the FERC for its wholesale electric operations, hydroelectric licensing, accounting practices, wholesale sales for resale, transmission of electricity in interstate commerce, compliance with NERC electric reliability standards, asset transfers and mergers, and natural gas transactions in interstate commerce.

NSP-Minnesota is a transmission owning member of the MISO RTO and operates within the MISO RTO and MISO wholesale markets. NSP-Minnesota makes wholesale sales in other RTO markets at market-based rates. NSP-Minnesota and NSP-Wisconsin also make wholesale electric sales at market-based prices to customers outside of their balancing authority as jointly authorized by the FERC.

Fuel, Purchased Energy and Conservation Cost-Recovery

Mechanisms —

• CIP rider — Recovers the costs of conservation and demand-side management programs.

• EIR — Recovers the costs of environmental improvement projects.

• RDF — Allocates money collected from retail customers to support the research and development of emerging renewable energy projects and technologies.

• RES — Recovers the cost of renewable generation in Minnesota.

• RER — Recovers the cost of renewable generation located in North Dakota.

• SEP — Recovers costs related to various energy policies approved by the Minnesota legislature.

• TCR — Recovers costs associated with investments in electric transmission and distribution grid modernization costs.

• Infrastructure rider — Recovers costs for investments in generation and incremental property taxes in South Dakota.

NSP-Minnesota’s retail electric rates in Minnesota, North Dakota and South Dakota include a FCA for monthly billing adjustments to recover changes in prudently incurred costs of fuel related items and purchased energy. Capacity costs are recovered through base rates and are not recovered through the FCA. Costs associated with MISO are generally recovered through either the FCA or base rates.

In 2017, the MPUC voted to change the FCA process in Minnesota. Under the new process, each month utilities would collect amounts equal to the baseline cost of energy set at the start of the plan year (base would be reset annually). Monthly variations to the baseline costs would be tracked and netted over a 12-month period. Utilities would issue refunds above the baseline costs, and could seek recovery of any overage. Recently, the MPUC delayed implementation until January 2020.

Minnesota state law requires NSP-Minnesota to invest 2% of its state electric revenues and 0.5% of its state gas revenues in CIP. These costs are recovered through an annual cost-recovery mechanism for electric conservation and energy management program expenditures.

Energy Sources and Transmission Service Provider

NSP-Minnesota expects to use power plants, power purchases, CIP/DSM options, new generation facilities and expansion of power plants to meet its system capacity requirements.

Purchased Power — NSP-Minnesota has contracts to purchase power from other utilities and IPPs. Long-term purchased power contracts for dispatchable resources typically require a capacity charge and an energy charge. NSP-Minnesota makes short-term purchases to meet system requirements, replace company owned generation, meet operating reserve obligations or obtain energy at a lower cost.

Purchased Transmission Services — NSP-Minnesota and NSP-Wisconsin have contracts with MISO and other regional transmission service providers to deliver power and energy to their customers.

Wind Development — In 2017, the MPUC approved NSP-Minnesota’s proposal to add 1,550 MW of new wind generation including ownership of 1,150 MW of wind generation.

In April 2018, the MPUC approved NSP-Minnesota’s petition to build and own the Dakota Range, a 300 MW wind project in South Dakota. NSP-Minnesota’s capital investment for the Dakota Range is expected to be approximately $350 million and placed in service in 2021.

In December 2018, the NDPSC approved a settlement agreement for these wind development projects.

PPA Terminations and Amendments — In June 2018, NSP-Minnesota terminated the Benson and Laurentian PPAs, and purchased the Benson biomass facility. As a result, a $103 million regulatory asset was recognized for the costs of the Benson transaction. For Laurentian, a regulatory asset of $109 million was recognized for annual termination payments/obligations. Regulatory approvals provide for recovery of the Benson regulatory asset over 10 years and Laurentian termination payments as they occur (over six years). Termination of the PPAs is expected to save customers over $600 million throughout the next 10 years.

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Jurisdictional Cost Recovery Allocation — In December 2016, NSP-Minnesota filed a resource treatment framework with the NDPSC and MPUC. The filing proposed a framework to allow NSP-Minnesota’s operations in North Dakota and Minnesota to gradually become more independent of one another with respect to future generation resource selection while also identifying a path for cost sharing of current resources. NSP-Minnesota’s filing identified two options: a legal separation, creating a separate North Dakota operating company; or a pseudo-separation, which maintains the current corporate structure but directly assigns the costs and benefits of each resource to the jurisdiction that supports it. Docket remains under consideration by the NDPSC.

Minnesota State ROFR Statute Complaint — In September 2017, LSP Transmission filed a complaint in the Minnesota District Court against the Minnesota Attorney General, MPUC and DOC. The complaint was in response to MISO assigning NSP-Minnesota and ITC Midwest, LLC to jointly own a new 345 KV transmission line from near Mankato, Minnesota to Winnebago, Minnesota. The project was estimated by MISO to cost $108 million and was assigned to NSP-Minnesota and ITC Midwest as the incumbent utilities, consistent with a Minnesota state ROFR statute. The complaint challenged the constitutionality of the state ROFR statute and is seeking declaratory judgment that the statute violates the Commerce Clause of the U.S. Constitution and should not be enforced. The Minnesota state agencies and NSP-Minnesota filed motions to dismiss. In June 2018, the Minnesota District Court granted the defendants’ motions to dismiss with prejudice. LSP Transmission filed an appeal in July 2018. It is uncertain when a decision will be rendered.

Nuclear Power Operations and Waste Disposal

NSP-Minnesota owns two nuclear generating plants: the Monticello plant and the PI plant. Nuclear power plant operations produce gaseous, liquid and solid radioactive wastes which are controlled by federal regulation. High-level radioactive wastes primarily include used nuclear fuel. LLW consists primarily of demineralizer resins, paper, protective clothing, rags, tools and equipment that have become contaminated through use in a plant.

NRC Regulation — The NRC regulates nuclear operations. Costs of complying with NRC requirements can affect both operating expenses and capital investments of the plants. NSP-Minnesota has obtained recovery of these compliance costs in customer rates and expects future compliance costs will continue to be recoverable.

LLW Disposal — LLW from NSP-Minnesota’s Monticello and PI nuclear plants is currently disposed at the Clive facility located in Utah and the Waste Control Specialists facility located in Texas. If off-site LLW disposal facilities become unavailable, NSP-Minnesota has storage capacity available on-site at PI and Monticello which would allow both plants to continue to operate until the end of their current licensed lives.

High-Level Radioactive Waste Disposal — The federal government has responsibility to permanently dispose domestic spent nuclear fuel and other high-level radioactive wastes. The Nuclear Waste Policy Act requires the DOE to implement a program for nuclear high-level waste management. This includes the siting, licensing, construction and operation of a repository for spent nuclear fuel from civilian nuclear power reactors and other high-level radioactive wastes at a permanent federal storage or disposal facility. The federal government has been evaluating a nuclear geologic repository at Yucca Mountain, Nevada for many years. Currently, there are no definitive plans for a permanent federal storage facility at Yucca Mountain or any other site.

Review of PI Costs —As part of NSP-Minnesota’s 2016 multi-year electric rate case and IRP, the MPUC ordered an investigation into NSP-Minnesota’s PI nuclear investments. The issue was resolved as part of the 2016 multi-year electric rate case settlement. In November 2018, the DOC issued a final report, in which no cost disallowances were recommended.

Nuclear Spent Fuel Storage—NSP-Minnesota has interim on-site storage for spent nuclear fuel at its Monticello and PI nuclear generating plants. Authorized storage capacity is sufficient to allow NSP-Minnesota to operate until the end of the operating licenses in 2030 for Monticello, 2033 for PI Unit 1, and 2034 for PI Unit 2. Authorizations for additional spent fuel storage capacity may be required at each site to support either continued operation or decommissioning if the federal government does not commence storage operations.

In 2013, NSP-Minnesota’s Monticello nuclear generating plant loaded and placed five storage canisters (canisters #11-15) in the ISFSI and a sixth canister (canister #16) was loaded but remained in the plant pending resolution of weld inspection issues. Successful pressure and leak testing demonstrated the safety and integrity of all six canisters involved. NSP-Minnesota took several actions to assure compliance with the NRC’s regulations and Monticello’s storage license. The NRC has approved NSP-Minnesota’s compliance plan for all canisters.

NSP-Minnesota intends to seek recovery of these costs in a future regulatory proceeding. No public safety issues have been raised, or are believed to exist, in this matter.

See Note 12 to the consolidated financial statements for further information.

Wholesale and Commodity Marketing Operations

NSP-Minnesota conducts various wholesale marketing operations, including the purchase and sale of electric capacity, energy, ancillary services and energy-related products. NSP-Minnesota uses physical and financial instruments to minimize commodity price and credit risk and hedge sales and purchases. NSP-Minnesota also engages in trading activity unrelated to hedging and sharing of any margins is determined through state regulatory proceedings as well as the operation of the FERC approved JOA. NSP-Minnesota does not serve any wholesale requirements customers at cost-based regulated rates.

NSP-Wisconsin

Public Utility Regulation

Summary of Regulatory Agencies and Areas of Jurisdiction — Retail rates, services and other aspects of NSP-Wisconsin’s operations are regulated by the PSCW and the MPSC. In addition, each of the state commissions certifies the need for new generating plants and electric transmission lines before the facilities may be sited and built. NSP-Wisconsin is subject to the jurisdiction of the FERC for its wholesale electric operations, hydroelectric generation licensing, accounting practices, wholesale sales for resale, transmission of electricity in interstate commerce, compliance with NERC electric reliability standards, asset transactions and mergers and natural gas transactions in interstate commerce. NSP-Wisconsin is a transmission owning member of the MISO RTO that operates within the MISO RTO and wholesale energy market. NSP-Wisconsin and NSP-Minnesota are jointly authorized by the FERC to make wholesale electric sales at market-based prices.

The PSCW has a biennial base rate filing requirement. By June of each odd numbered year, NSP-Wisconsin must submit a rate filing for the test year beginning the following January.

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Fuel and Purchased Energy Cost Recovery Mechanisms — NSP-Wisconsin does not have an automatic electric fuel adjustment clause. Instead, under Wisconsin rules, utilities submit a forward-looking annual fuel cost plan to the PSCW. Once the PSCW approves the fuel cost plan, utilities defer the amount of any fuel cost under-recovery or over-recovery in excess of a 2% annual tolerance band, for future rate recovery or refund. Approval of a fuel cost plan and any rate adjustment for refund or recovery of deferred costs is determined by the PSCW. Rate recovery of deferred fuel cost is subject to an earnings test based on the utility’s most recently authorized ROE. Fuel cost under-collections that exceed the 2% annual tolerance band may not be recovered if the utility earnings for that year exceed the authorized ROE.

NSP-Wisconsin’s electric fuel costs for 2018 were lower than authorized in rates and outside the 2% annual tolerance band, primarily due to greater than forecasted generation sales into the MISO market and lower purchased power costs coupled with moderate weather. Under the fuel cost recovery rules, NSP-Wisconsin retained approximately $3.6 million of fuel costs and deferred approximately $2.8 million. NSP-Wisconsin will file a reconciliation of 2018 fuel costs with the PSCW by March 31, 2019. 

NSP-Wisconsin’s retail electric rate schedules for Michigan customers include power supply cost recovery factors, which are based on 12-month projections. After each 12-month period, a reconciliation is submitted whereby over-recoveries are refunded and any under-recoveries are collected from customers.

Wisconsin Energy Efficiency Program — The primary energy efficiency program is funded by the state’s utilities, but operated by independent contractors subject to oversight by the PSCW and utilities. NSP-Wisconsin recovers these costs from retail customers.

Transmission Initiatives

NSP-Wisconsin operates an integrated system with NSP-Minnesota. See NSP-Minnesota-Energy Sources and Transmission Service Provider.

NSP-Wisconsin / American Transmission Company, LLC - La Crosse to Madison, WI Transmission Line — In December 2018, construction was completed on the Badger Coulee 345 KV transmission line. The line extends from La Crosse, WI. to Madison, WI. NSP-Wisconsin’s half of the line is shared with Dairyland Power Cooperative, WPPI Energy and Southern Minnesota Municipal Power Agency-Wisconsin.

Wholesale and Commodity Marketing Operations

NSP-Wisconsin does not serve any wholesale requirements customers at cost-based regulated rates.

PSCo

Public Utility Regulation

Summary of Regulatory Agencies and Areas of Jurisdiction — PSCo is regulated by the CPUC with respect to its facilities, rates, accounts, services and issuance of securities. PSCo is regulated by the FERC for its wholesale electric operations, accounting practices, hydroelectric licensing, wholesale sales for resale, transmission of electricity in interstate commerce, compliance with the NERC electric reliability standards, asset transactions and mergers and natural gas transactions in interstate commerce. PSCo is not presently a member of an RTO and does not operate within an RTO energy market. However, PSCo does make certain sales to other RTO’s, including SPP. PSCo makes wholesale electric sales at cost-based prices to customers inside PSCo’s balancing authority area and at market-based prices to customers outside PSCo’s balancing authority area as authorized by the FERC.

Fuel, Purchased Energy and Conservation Cost-Recovery

Mechanisms

• ECA — Recovers fuel and purchased energy costs. Short-term sales margins are shared with retail customers through the ECA. The ECA is revised quarterly.

• PCCA — Recovers purchased capacity payments.

• SCA — Recovers the difference between PSCo’s actual cost of fuel and costs recovered under its steam service rates. The SCA rate is revised quarterly.

• DSMCA — Recovers DSM, interruptible service costs and performance initiatives for achieving energy savings goals.

• RESA — Recovers the incremental costs of compliance with the RES with a maximum of 2% of the customer’s bill.

• WCA — Recovers costs for customers who choose renewable resources.

• TCA — Recovers costs for transmission investment outside of rate cases.

• CACJA — Recovers costs associated with the CACJA.

PSCo recovers fuel and purchased energy costs from its wholesale electric customers through a fuel cost adjustment clause approved by the FERC. Wholesale customers pay their jurisdictional allocation of production costs through a fully forecasted formula rate with true-up.

Energy Sources and Transmission Service Providers

PSCo expects to meet its system capacity requirements through electric generating stations, power purchases, new generation facilities, DSM options and expansion of generation plants.

Purchased Power — PSCo purchases power from other utilities and IPPs. Long-term purchased power contracts for dispatchable resources typically require capacity and energy charges. It also contracts to purchase power for both wind and solar resources. PSCo makes short-term purchases to meet system load and energy requirements, replace owned generation, meet operating reserve obligations, or obtain energy at a lower cost.

Purchased Transmission Services — In addition to using its own transmission system, PSCo has contracts with regional transmission service providers to deliver energy to its customers.

Wind Development — In 2018, PSCo completed construction and placed in service its Rush Creek 600 MW wind farm in Colorado.

CEP — In September 2018, the CPUC approved PSCo’s preferred CEP portfolio, which included the retirement of two coal-fired generation units, Comanche Unit 1 (in 2022) and Comanche Unit 2 (in 2025), and the following additions:

	Total Capacity	PSCo's Ownership
Wind generation	1,100 MW	500 MW
Solar generation	700 MW	—
Battery storage	275 MW	—
Natural gas generation	380 MW	380 MW

PSCo’s investment is expected to be approximately $1 billion, including transmission to support the increase in renewable generation. This investment includes the 500 MW Cheyenne Ridge wind farm and 345 KV generation tie line, as well as the Shortgrass Substation. CPCNs for these projects were filed in December 2018. A CPUC decision is anticipated by May 2019. CPCNs for the natural gas generation facility are anticipated to be filed by mid-2019.

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Boulder Municipalization — In 2011, Boulder passed a ballot measure authorizing the formation of an electric municipal utility, subject to certain conditions. Subsequently, there have been various legal proceedings in multiple venues with jurisdiction over Boulder’s plan. In 2014, the Boulder City Council passed an ordinance to establish an electric utility. PSCo challenged the formation of this utility and the Colorado Court of Appeals ruled in PSCo’s favor, vacating a lower court decision. In June 2018, the Colorado Supreme court rejected Boulder’s request to dismiss the case and remanded it to the Boulder District Court.

Boulder has filed multiple separation applications with the CPUC, which have been challenged by PSCo and other intervenors. In September 2017, the CPUC issued a written decision, agreeing with several key aspects of PSCo’s position. The CPUC has approved the designation of some electrical distribution assets for transfer, subject to Boulder completing certain filings. Those filings were submitted in the fourth quarter of 2018. Subsequently, various parties requested the CPUC commence additional processes; the form of such processes is currently under consideration. In the fourth quarter of 2018, Boulder’s City Council also adopted an Ordinance authorizing Boulder to begin negotiations for the acquisition of certain property or to otherwise condemn that property after Feb. 1, 2019. In the first quarter of 2019, Boulder sent PSCo a Notice of Intent to acquire certain electric distribution assets.

Boulder does not have authorization from the CPUC to initiate a condemnation proceeding at this time.

Wholesale and Commodity Marketing Operations

PSCo conducts various wholesale marketing operations, including the purchase and sale of electric capacity, energy, ancillary services and energy related products. PSCo uses physical and financial instruments to minimize commodity price and credit risk and hedge sales and purchases. PSCo also engages in trading activity unrelated to hedging and sharing of any margins is determined through state regulatory proceedings as well as the operation of the FERC approved JOA.

SPS

Public Utility Regulation

Summary of Regulatory Agencies and Areas of Jurisdiction — The PUCT and NMPRC regulate SPS’ retail electric operations and have jurisdiction over its retail rates and services and the construction of transmission or generation in their respective states. The municipalities in which SPS operates in Texas have original jurisdiction over SPS’ rates in those communities. The municipalities’ rate setting decisions are subject to PUCT review.

SPS is regulated by the FERC for its wholesale electric operations, accounting practices, wholesale sales for resale, the transmission of electricity in interstate commerce, compliance with NERC electric reliability standards, asset transactions and mergers, and natural gas transactions in interstate commerce. SPS is a transmission-owning member of the SPP RTO and operates within the SPP RTO and SPP IM wholesale market. SPS is authorized to make wholesale electric sales at market-based prices.

Fuel, Purchased Energy and Conservation Cost-Recovery

Mechanisms —

• DCRF — Recovers distribution costs not included in rates in Texas.

• EECRF — Recovers costs for energy efficiency programs in Texas.

• EE rider — Recovers costs for energy efficiency programs in New Mexico.

• FPPCAC — Adjusts monthly to recover the actual fuel and purchased power costs in New Mexico.

• PCRF — Allows recovery of purchased power costs not included in rates in Texas.

• RPS — Recovers deferred costs for renewable energy programs in New Mexico.

• TCRF — Recovers certain transmission infrastructure improvement costs and changes in wholesale transmission charges not included in base rates in Texas.

The fixed fuel and purchased energy recovery factor provides for the over- or under-recovery of energy expenses. Regulations require refunding or surcharging over- or under- recovery amounts, including interest, when they exceed 4% of the utility’s annual fuel and purchased energy costs on a rolling 12-month basis, if this condition is expected to continue.

SPS recovers fuel and purchased energy costs from its wholesale customers through a monthly wholesale fuel and purchased energy cost adjustment clause accepted by the FERC. Wholesale customers also pay the jurisdictional allocation of production costs.

Energy Sources and Transmission Service Providers

SPS expects to use electric generating stations, power purchases, DSM and new generation options to meet its system capacity requirements. In addition, it has evaluated water supply issues at the Tolk facility, concluding additional resource investment will be required to operate the plant through its existing life. The Ogallala aquifer has depleted more rapidly than expected. SPS installed a horizontal water well that may help delay the need for a more substantial investment solution. As a result of this issue and future environmental rules facing the plant, it sought a decrease to the remaining life of the facility in the 2017 Texas and New Mexico rate case proceedings.

Purchased Power — SPS purchases power from other utilities and IPPs. Long-term purchased power contracts typically require periodic capacity and energy charges. SPS also makes short-term purchases to meet system load and energy requirements to replace owned generation, meet operating reserve obligations or obtain energy at a lower cost.

Purchased Transmission Services — SPS has contractual arrangements with SPP and regional transmission service providers to deliver power and energy to its native load customers.

Wind Development — In 2018, the NMPRC and PUCT approved SPS’ proposal to add 1,230 MW of new wind generation, including 1,000 MW ownership.

In March 2018, the NMPRC approved SPS’ petition to build and own Sagamore, a 522 MW wind project in New Mexico which is expected to be placed into service in 2020. In May 2018, the PUCT approved SPS’ petition to build and own Hale County, a 478 MW wind project in Texas which is expected to be placed into service in 2019. Both projects qualify for 100% of PTCs. SPS’ capital investment for these wind projects is expected to be approximately $1.6 billion.

Texas State ROFR Request for Declaratory Order —In 2017, SPS and SPP filed a joint petition with the PUCT for a declaratory order regarding SPS’ ROFR. SPS contended that Texas law grants an incumbent electric utility the ROFR to construct new transmission facilities located in the utility’s service area. The PUCT subsequently issued an order finding that SPS does not possess an exclusive right to construct and operate transmission facilities. In January 2018, SPS and two other parties filed appeals in the Texas State District Court. In September 2018, the District Court affirmed the PUCT’s ROFR order. SPS has filed an additional appeal.

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NATURAL GAS UTILITY OPERATIONS

Natural Gas Operating Statistics

	Year Ended Dec. 31
	2018		2017		2016
Natural gas deliveries (Thousands of MMBtu)
Residential	149,036		134,189		132,853
C&I	96,447		87,271		84,082
Total retail	245,483		221,460		216,935
Transportation and other	173,092		142,497		133,498
Total deliveries	418,575		363,957		350,433
Number of customers at end of period
Residential	1,878,576		1,856,221		1,835,507
C&I	158,424		157,798		157,286
Total retail	2,037,000		2,014,019		1,992,793
Transportation and other	7,951		7,705		7,316
Total customers	2,044,951		2,021,724		2,000,109
Natural gas revenues (Millions of Dollars)
Residential	$	1,045	$	1,006	$	930
C&I	556		524		469
Total retail	1,601		1,530		1,399
Transportation and other	138		120		132
Total natural gas revenues	$	1,739	$	1,650	$	1,531
MMBtu sales per retail customer	120.51		109.96		108.86
Revenue per retail customer	$	786	$	760	$	702
Residential revenue per MMBtu	7.01		7.50		7.00
C&I revenue per MMBtu	5.76		6.00		5.58
Transportation and other revenue per MMBtu	0.80		0.84		0.99

Capability and Demand

Natural gas supply requirements are categorized as firm or interruptible (customers with an alternate energy supply).

Maximum daily send-out (firm and interruptible) and occurrence date:

	2018			2017
Utility Subsidiary	MMBtu		Date	MMBtu	Date
NSP-Minnesota	786,751	(a)	Jan. 12	893,062	Dec. 26
NSP-Wisconsin	159,700		Jan. 5	160,170	Dec. 26
PSCo	1,903,878	(a)	Feb. 20	1,948,167	Jan. 5

^(a)  Decrease in MMBtu output due to milder winter temperatures in 2018.

Natural gas is purchased from independent suppliers, generally based on market indices that reflect current prices, and is delivered under transportation agreements with interstate pipelines.

Contracted firm deliverable pipeline capacity as of Dec. 31:

Utility Subsidiary	MMBtu Per Day
NSP-Minnesota	645,171
NSP-Wisconsin	140,195
PSCo	1,834,843	(a)

^(a)  Includes 871,418 MMBtu of natural gas under third-party underground storage agreements.

The utility subsidiaries contract with providers of underground natural gas storage services. Agreements provided storage of winter natural gas and peak day firm requirements for 2018 as follows:

Utility Subsidiary	Percent of Winter Requirements	Peak Day Firm Requirements
NSP-Minnesota	24%	29%
NSP-Wisconsin	30	33

PSCo also operates three company-owned underground storage facilities, which provide approximately 43,500 MMBtu of natural gas on peak days. The balance required to meet firm peak day sales obligations is primarily purchased at PSCo’s city gate meter stations.

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Natural Gas Supply and Costs

Xcel Energy actively seeks natural gas supply, transportation and storage alternatives to yield a diversified portfolio which provides increased flexibility, decreased interruption and financial risk and economical rates. In addition, the utility subsidiaries conduct natural gas price hedging activities approved by their respective state commissions.

Average delivered cost per MMBtu of natural gas for regulated retail distribution:

	NSP-Minnesota		NSP-Wisconsin		PSCo
2018	$	4.03	$	3.84	$	3.20
2017	3.89		3.88		3.45

NSP-Minnesota, NSP-Wisconsin and PSCo have natural gas supply transportation and storage agreements that include obligations for purchase and/or delivery of specified volumes or to make payments in lieu of delivery. As of Dec. 31, 2018, the utility subsidiaries had the following contractual obligations:

• NSP-Minnesota — $437 million (expire 2019 - 2033);

• NSP-Wisconsin — $89 million (expire 2019 - 2029); and,

• PSCo — $1.1 billion (expire 2019 - 2029).

NSP-Minnesota

Public Utility Regulation

Summary of Regulatory Agencies and Areas of Jurisdiction — Retail rates, services and other aspects of NSP-Minnesota’s retail natural gas operations are regulated by the MPUC and NDPSC. The MPUC has regulatory authority over security issuances, certain property transfers, mergers with other utilities and transactions between NSP-Minnesota and its affiliates. The MPUC reviews and approves NSP-Minnesota’s natural gas supply plans for meeting future energy needs. NSP-Minnesota is subject to the jurisdiction of the FERC with respect to certain natural gas transactions in interstate commerce. NSP-Minnesota is also subject to the DOT, Minnesota Office of Pipeline Safety, NDPSC and SDPUC for pipeline safety compliance.

Purchased Gas and Conservation Cost-Recovery Mechanisms — NSP-Minnesota’s retail natural gas rates for Minnesota and North Dakota include a PGA clause that provides for prospective monthly rate adjustments to reflect the forecasted cost of purchased natural gas, transportation and storage service. The annual difference between the natural gas cost revenues collected through PGA rates and the actual natural gas costs is collected or refunded over the subsequent 12-month period.

NSP-Minnesota also recovers costs associated with transmission and distribution pipeline integrity management programs through its GUIC rider. Costs recoverable under the GUIC rider include funding for pipeline assessments as well as deferred costs from NSP-Minnesota’s existing sewer separation and pipeline integrity management programs.

NSP-Wisconsin

Public Utility Regulation

Summary of Regulatory Agencies and Areas of Jurisdiction — NSP-Wisconsin is regulated by the PSCW and MPSC. The PSCW has a biennial base-rate filing requirement. By June of each odd-numbered year, NSP-Wisconsin must submit a rate filing for the test year period beginning the following January.

NSP-Wisconsin is subject to the jurisdiction of the FERC with respect to natural gas transactions in interstate commerce. NSP-Wisconsin is subject to the DOT, PSCW and MPSC for pipeline safety compliance.

Natural Gas Cost-Recovery Mechanisms — NSP-Wisconsin has a retail PGA cost-recovery mechanism for Wisconsin to recover the actual cost of natural gas and transportation and storage services.

NSP-Wisconsin’s natural gas rates for Michigan customers include a natural gas cost-recovery factor, which is based on 12-month projections and trued-up to actual amounts on an annual basis.

PSCo

Public Utility Regulation

Summary of Regulatory Agencies and Areas of Jurisdiction — PSCo is regulated by the CPUC with respect to its facilities, rates, accounts, services and issuance of securities. PSCo holds a FERC certificate that allows it to transport natural gas in interstate commerce without PSCo becoming subject to full FERC jurisdiction. PSCo is subject to the DOT and CPUC with regards to pipeline safety compliance.

Purchased Natural Gas and Conservation Cost-Recovery Mechanisms

• GCA — Recovers the costs of purchased natural gas and transportation to meet customer requirements and is revised quarterly to allow for changes in natural gas rates.

• DSMCA — Recovers costs of DSM and performance initiatives to achieve various energy savings goals.

• PSIA — Recovers costs for transmission and distribution pipeline integrity management programs.

SPS

Natural Gas Facilities Used for Electric Generation

SPS does not provide retail natural gas service, but purchases and transports natural gas for its generation facilities and operates natural gas pipeline facilities connecting the generation facilities to interstate natural gas pipelines. SPS is subject to the jurisdiction of the FERC with respect to natural gas transactions in interstate commerce and the PHMSA and PUCT for pipeline safety compliance.

GENERAL

Seasonality

Demand for electric power and natural gas is affected by seasonal differences in the weather. In general, peak sales of electricity occur in the summer months and peak sales of natural gas occur in the winter months. As a result, the overall operating results may fluctuate substantially on a seasonal basis. Additionally, Xcel Energy’s operations have historically generated less revenues and income when weather conditions are milder in the winter and cooler in the summer.

See Item 7 for further information.

Competition

Xcel Energy is a vertically integrated utility subject to traditional cost-of-service regulation by state public utilities commissions. Xcel Energy is subject to public policies that promote competition and development of energy markets. Xcel Energy’s industrial and large commercial customers have the ability to generate their own electricity. In addition, customers may have the option of substituting other fuels or relocating their facilities to a lower cost region.

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Customers have the opportunity to supply their own power with distributed generation including, but not limited to, solar generation and in most jurisdictions can currently avoid paying for most of the fixed production, transmission and distribution costs incurred to serve them. Several states have policies designed to promote the development of solar and other distributed energy resources through incentive policies. With these incentives and federal tax subsidies, distributed generating resources are potential competitors to Xcel Energy’s electric service business.

The FERC has continued to promote competitive wholesale markets through open access transmission and other means. As a result, Xcel Energy Inc.’s utility subsidiaries and their wholesale customers can purchase the output from generation resources of competing wholesale suppliers and use the transmission systems of the utility subsidiaries on a comparable basis to serve their native load.

FERC Order No. 1000 seeks to establish competition for construction and operation of certain new electric transmission facilities. State utilities commissions have also created resource planning programs that promote competition for electricity generation resources used to provide service to retail customers.

Xcel Energy Inc.’s utility subsidiaries have franchise agreements with cities subject to periodic renewal, however, a city could seek alternative means to access electric power or gas, such as municipalization.

While each of Xcel Energy Inc.’s utility subsidiaries faces these challenges, Xcel Energy believes their rates and services are competitive with the alternatives currently available.

ENVIRONMENTAL MATTERS

Xcel Energy’s facilities are regulated by federal and state environmental agencies that have jurisdiction over air emissions, water quality, wastewater discharges, solid wastes and hazardous substances. Various company activities require registrations, permits, licenses, inspections and approvals from these agencies. Xcel Energy has received all necessary authorizations for the construction and continued operation of its generation, transmission and distribution systems. Xcel Energy’s facilities have been designed and constructed to operate in compliance with applicable environmental standards and related monitoring and reporting requirements. However, it is not possible to determine when or to what extent additional facilities or modifications of existing or planned facilities will be required as a result of changes to environmental regulations, interpretations or enforcement policies or what effect future laws or regulations may have upon Xcel Energy’s operations. Xcel Energy will likely be required to incur capital expenditures in the future to comply with requirements for remediation of MGP and other legacy sites. The scope and timing of these expenditures cannot be determined until more information is obtained regarding the need for remediation at legacy sites.

In Minnesota, Texas and Wisconsin, Xcel Energy must comply with emission budgets that require the purchase of emission allowances from other utilities. The Denver North Front Range Nonattainment Area does not meet either the 2008 or 2015 ozone NAAQS. Colorado will continue to consider further reductions available in the non-attainment area as it develops plans to meet ozone standards. Gas plants which operate in PSCo’s non-attainment area may be required to improve or add controls, implement further work practices and/or implement enhanced emissions monitoring as part of future Colorado state plans.

There are significant present and future environmental regulations to encourage use of clean energy technologies and regulate emissions of GHGs. Xcel Energy has undertaken numerous initiatives to meet current requirements and prepare for potential future regulations, reduce GHG emissions and respond to state renewable and energy efficiency goals. If future environmental regulations do not provide credit for the investments Xcel Energy has already made or if they require additional initiatives or emission reductions, substantial costs may be incurred. The EPA, as an alternative to the CPP, has proposed a new regulation that, if adopted, would require implementation of heat rate improvement projects at our coal-fired power plants. It is not known what those costs might be until a final rule is adopted and state plans are developed to implement a final regulation. Xcel Energy believes, based on prior state commission practice, the cost of these initiatives or replacement generation would be recoverable through rates.

Xcel Energy is committed to addressing climate change and potential climate change regulation through efforts to reduce its GHG emissions in a balanced, cost-effective manner. Starting in 2011, Xcel Energy began reporting GHG emissions under the EPA’s mandatory GHG Reporting Program.

Xcel Energy estimates that in 2018, it reduced the CO₂ emissions associated with the electric generating resources used to serve its customers by approximately 40% from 2005 levels. This reduction accounts for emissions from electric generating plants owned by Xcel Energy as well as purchased power.

Xcel Energy primarily relied on strategies that resulted in:

• Development of renewable energy facilities;

• Retirement and replacement of existing generating plants; and,

• Customer energy efficiency programs.

CAPITAL SPENDING AND FINANCING

See Item 7 for a discussion of expected capital expenditures and funding sources.

EMPLOYEES

As of Dec. 31, 2018, Xcel Energy had 11,043 full-time employees and 49 part-time employees, of which 5,129 were covered under CBAs.

	Employees Covered by CBAs	Total Employees
NSP-Minnesota	2,064	3,278
NSP-Wisconsin	386	540
PSCo	1,904	2,426
SPS	775	1,151
XES	—	3,697
Total	5,129	11,092

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EXECUTIVE OFFICERS (a)
Name	Age (b)	Current and Recent Positions Held	Time in Position
Ben Fowke	60	Chairman of the Board, President and Chief Executive Officer and Director, Xcel Energy Inc.	August 2011 - Present
		Chief Executive Officer, NSP-Minnesota, NSP-Wisconsin, PSCo, and SPS	January 2015 - Present
Brett C. Carter	52	Executive Vice President and Chief Customer and Innovation Officer, Xcel Energy Inc.	May 2018 - Present
		Senior Vice President and Shared Services Executive, Bank of America	October 2015 - May 2018
		Senior Vice President and Chief Operating Officer, Bank of America	March 2015 - October 2015
		Senior Vice President and Chief Distribution Officer, Duke Energy Co.	February 2013 - March 2015
Christopher B. Clark	52	President and Director, NSP-Minnesota	January 2015 - Present
		Regional Vice President, Rates and Regulatory Affairs, NSP-Minnesota	October 2012 - December 2014
David L. Eves	60	Executive Vice President and Group President, Utilities, Xcel Energy Inc.	March 2018 - Present
		President and Director, PSCo	January 2015 - February 2018
		President, Director and Chief Executive Officer, PSCo	December 2009 - December 2014
Darla Figoli	56	Senior Vice President, Human Resources & Employee Services, Chief Human Resources Officer, Xcel Energy Inc.	May 2018 - Present
		Senior Vice President, Human Resources and Employee Services, Xcel Energy Inc.	May 2015 - May 2018
		Vice President, Human Resources, Xcel Energy Inc.	February 2010 - May 2015
Robert C. Frenzel	48	Executive Vice President, Chief Financial Officer, Xcel Energy Inc.	May 2016 - Present
		Senior Vice President and Chief Financial Officer, Luminant, a subsidiary of Energy Future Holdings Corp. (c)	February 2012 - April 2016
David T. Hudson	58	President and Director, SPS	January 2015 - Present
		President, Director and Chief Executive Officer, SPS	January 2014 - December 2014
Alice Jackson	40	President and Director, PSCo	May 2018 - Present
		Area Vice President, Strategic Revenue Initiatives, Xcel Energy Services Inc.	November 2016 - May 2018
		Regional Vice President, Rates and Regulatory Affairs, PSCo	October 2011 - November 2016
Kent T. Larson	59	Executive Vice President and Group President Operations, Xcel Energy Inc.	January 2015 - Present
		Senior Vice President, Group President Operations, Xcel Energy Services Inc.	August 2014 - December 2014
		Senior Vice President Operations, Xcel Energy Services Inc.	September 2011 - August 2014
Timothy O’Connor	59	Senior Vice President, Chief Nuclear Officer, Xcel Energy Services Inc.	February 2013 - Present
Judy M. Poferl	59	Senior Vice President, Corporate Secretary and Executive Services, Xcel Energy Inc.	January 2015 - Present
		Vice President, Corporate Secretary, Xcel Energy Inc.	May 2013 - December 2014
Jeffrey S. Savage	47	Senior Vice President, Controller, Xcel Energy Inc.	January 2015 - Present
		Vice President, Controller, Xcel Energy Inc.	September 2011 - December 2014
Mark E. Stoering	58	President and Director, NSP-Wisconsin	January 2015 - Present
		President, Director and Chief Executive Officer, NSP-Wisconsin	January 2012 - December 2014
Scott M. Wilensky	62	Executive Vice President, General Counsel, Xcel Energy Inc.	January 2015 - Present
		Senior Vice President, General Counsel, Xcel Energy Inc.	September 2011 - December 2014

^(a)    No family relationships exist between any of the executive officers or directors.

^(b)    Ages as of Dec. 31, 2018.

^(c)  In April 2014, Energy Future Holdings Corp., the majority of its subsidiaries, including TCEH the parent company of Luminant, filed a voluntary bankruptcy petition. TCEH emerged from Chapter 11 in October 2016. 

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Item 1A — Risk Factors

Xcel Energy is subject to a variety of risks, many of which are beyond our control. Risks that may adversely affect the business, financial condition, results of operations or cash flows are described below. These risks should be carefully considered together with the other information set forth in this report and future reports that Xcel Energy files with the SEC.

Oversight of Risk and Related Processes

A key accountability of the Board of Directors is the oversight of material risk, and our Board of Directors employs an effective process for doing so. Management and each Board of Directors’ committee have responsibility for overseeing the identification and mitigation of key risks and reporting its assessments and activities to the full Board of Directors.

Management identifies and analyzes risks to determine materiality and other attributes such as timing, probability and controllability. Identification and analysis occurs formally through a key risk assessment conducted by senior management, the financial disclosure process, hazard risk management procedures and internal auditing and compliance with financial and operational controls. Management also identifies and analyzes risk through its business planning process and development of goals and key performance indicators, which include risk identification to determine barriers to implementing Xcel Energy’s strategy. The business planning process also identifies areas in which there is a potential for a business area to assume inappropriate risk to meet goals and determines how to prevent inappropriate risk-taking.

Xcel Energy has a robust compliance program and promotes a culture of compliance, including tone at the top. The process for risk mitigation includes adherence to our code of conduct and compliance policies, operation of formal risk management structures and overall business management to mitigate the risks inherent in the implementation of strategy. Xcel Energy manages and further mitigates risks through formal risk management structures, including management councils, risk committees and services of corporate areas such as internal audit, corporate controller and legal.

Management communicates regularly with the Board of Directors and key stakeholders regarding risk. Senior management presents and communicates a periodic risk assessment to the Board of Directors which provides information on the risks management believes are material, including the earnings impact, timing, likelihood and controllability.

The Board of Directors approaches oversight, management and mitigation of risk as an integral and continuous part of its governance of Xcel Energy. The Board of Directors regularly reviews management’s key risk assessment and analyzes areas of existing and future risks and opportunities. In addition, the Board of Directors assigns oversight of critical risks to its four committees to ensure these risks are well understood and given appropriate focus. The Audit Committee is responsible for reviewing the adequacy of risk oversight and affirming that appropriate oversight occurs. Oversight of cybersecurity risks by the Operations, Nuclear, Environmental and Safety Committee includes receiving independent outside assessments of cybersecurity maturity and assessment of plans.

New risks are considered and assigned as appropriate during the annual Board of Directors’ and committee evaluation process. Committee charters and annual work plans are updated accordingly. Committees regularly report on their oversight activities and certain risk issues may be brought to the full Board of Directors for consideration when deemed appropriate. Finally, the Board of Directors conducts an annual strategy session where Xcel Energy’s future plans and initiatives are reviewed.

Risks Associated with Our Business

Operational Risks

Our natural gas and electric transmission and distribution operations involve numerous risks that may result in accidents and other operating risks and costs.

Our natural gas transmission and distribution activities include inherent hazards and operating risks, such as leaks, explosions, outages and mechanical problems. Our electric transmission and distribution activities also include inherent hazards and operating risks such as contact, fire and outages which could cause substantial financial losses. These natural gas and electric risks could result in loss of life, significant property damage, environmental pollution, impairment of our operations and substantial losses. We maintain insurance against some, but not all, of these risks and losses. The occurrence of these events, if not fully covered by insurance, could have a material effect on our financial condition, results of operations and cash flows.

Additionally, for natural gas costs that may be required in order to comply with potential new regulations, including the Pipeline Safety Act, could be significant.

The Pipeline Safety Act requires verification of pipeline infrastructure records by pipeline owners and operators to confirm the maximum allowable operating pressure of lines located in high consequence areas or more-densely populated areas. We have programs in place to comply with the Pipeline Safety Act and for systematic infrastructure monitoring and renewal over time. A significant incident could increase regulatory scrutiny and result in penalties and higher costs of operations.

The PHMSA is responsible for administering the DOT’s national regulatory program to assure the safe transportation of natural gas, petroleum and other hazardous materials by pipelines. The PHMSA continues to develop regulations and other approaches to risk management to assure safety in design, construction, testing, operation, maintenance and emergency response of natural gas pipeline infrastructure.

Our utility operations are subject to long-term planning risks.

Most electric utility investments are planned to be used for decades. Transmission and generation investments typically have long lead times and are planned well in advance of when they are brought in-service subject to long-term resource plans. These plans are based on numerous assumptions such as: sales growth, customer usage, commodity prices, economic activity, costs, regulatory mechanisms, customer behavior, available technology and public policy.

The electric utility sector is undergoing a period of significant change. For example, increases in appliance, lighting and energy efficiency, wider adoption and lower cost of renewable generation and distributed generation, shifts away from coal generation to decrease CO₂ emissions and increasing use of natural gas in electric generation driven by lower natural gas prices. Customer adoption of these technologies and increased energy efficiency could result in excess transmission and generation resources as well as stranded costs if Xcel Energy is not able to fully recover the costs and investments. These changes also introduce additional uncertainty into long-term planning which gives rise to a risk that the magnitude and timing of resource additions and growth in customer demand may not coincide and that the preference for the types of additions may change from planning to execution. In addition, we are subject to longer-term availability of the natural resource inputs such as coal, natural gas, uranium and water to cool our facilities. Lack of availability of these resources could jeopardize long-term operations of our facilities or make them uneconomic to operate.

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Changing customer expectations and technologies are requiring significant investments in advanced grid infrastructure. This increases the exposure to potential outdating of technologies and resultant risks. The inability of coal mining companies to attract capital could disrupt longer-term supplies. Decreasing use per customer driven by appliance and lighting efficiency and the availability of cost-effective distributed generation places downward pressure on sales growth. This may lead to under recovery of costs, excess resources to meet customer demand and increases in electric rates. Finally, multiple states may not agree as to the appropriate resource mix and the differing views may lead to costs incurred to comply with one jurisdiction that are not recoverable across all of the jurisdictions served by the same assets.

Our subsidiary, NSP-Minnesota, is subject to the risks of nuclear generation.

NSP-Minnesota’s two nuclear stations, PI and Monticello, subject it to the risks of nuclear generation, which include:

• Risks associated with use of radioactive material in the production of energy, the management, handling, storage and disposal of radioactive materials;

• Limitations on insurance available to cover losses that might arise in connection with nuclear operations, as well as obligations to contribute to an insurance pool in the event of damages at a covered U.S. reactor; and,

• Uncertainties with the technological and financial aspects of decommissioning nuclear plants. For example, assumptions regarding decommissioning costs may change based on economic conditions and changes in the expected life of the asset may cause our funding obligations to change.

The NRC has authority to impose licensing and safety-related requirements for the operation of nuclear generation facilities. The NRC has the authority to impose fines and/or shut down a unit until compliance is achieved. Revised NRC safety requirements could necessitate substantial capital expenditures or an increase in operating expenses. In addition, the Institute for Nuclear Power Operations reviews NSP-Minnesota’s nuclear operations and nuclear generation facilities. Compliance with the Institute for Nuclear Power Operations’ recommendations could result in substantial capital expenditures or a substantial increase in operating expenses.

If an incident did occur, it could have a material effect on our results of operations, financial condition or cash flows. Furthermore, the non-compliance or the occurrence of a serious incident at other nuclear facilities could result in increased regulation of the industry, which may increase NSP-Minnesota’s compliance costs.

NSP-Wisconsin’s production and transmission system is operated on an integrated basis with NSP-Minnesota. NSP-Wisconsin may be subject to risks associated with NSP-Minnesota’s nuclear generation.

We are subject to commodity risks and other risks associated with energy markets and energy production.

If fuel costs increase, customer demand could decline and bad debt expense may rise, which could have a material impact on our results of operations. While we have fuel clause recovery mechanisms in most of our states, higher fuel costs could significantly impact our results of operations if costs are not recovered. Delays in the timing of the collection of fuel cost recoveries could impact our cash flows. Low fuel costs have a positive impact on sales, however low oil and natural gas prices could negatively impact oil and gas production activities and subsequently our sales volumes and revenue.

A significant disruption in supply could cause us to seek alternative supply services at potentially higher costs or suffer increased liability for unfulfilled contractual obligations. Significantly higher energy or fuel costs relative to sales commitments have a negative impact on our cash flows and potentially result in economic losses. Potential market supply shortages may not be fully resolved through alternative supply sources and could cause disruptions in our ability to provide electric and/or natural gas services to our customers. Failure to provide service due to disruptions may also result in fines, penalties or cost disallowances through the regulatory process.

We also engage in wholesale sales and purchases of electric capacity, energy and energy-related products as well as natural gas. In many markets, emission allowances and/or RECs are also needed to comply with various statutes and commission rulings. As a result we are subject to market supply and commodity price risk. Commodity price changes can affect the value of our commodity trading derivatives. We mark certain derivatives to estimated fair market value on a daily basis. Actual settlements can vary significantly from estimated fair values recorded and significant changes from the assumptions underlying our fair value estimates could cause earnings variability.

Financial Risks

Our profitability depends on the ability of our utility subsidiaries to recover their costs and changes in regulation may impair the ability of our utility subsidiaries to recover costs from their customers.

We are subject to comprehensive regulation by federal and state utility regulatory agencies, including siting and construction of facilities, customer service and the rates that we can charge customers.

The profitability of our utility operations is dependent on our ability to recover the costs of providing energy and utility services and earn a return on our capital investment. Our rates are generally regulated and based on an analysis of the utility’s costs incurred in a test year. Our utility subsidiaries are subject to both future and historical test years depending upon the regulatory jurisdiction. Thus, the rates a utility is allowed to charge may or may not match its costs at any given time. Rate regulation is premised on providing an opportunity to earn a reasonable rate of return on invested capital. In a continued low interest rate environment there has been pressure pushing down ROE. There can also be no assurance that our regulatory commissions will judge all the costs of our utility subsidiaries to be prudent, which could result in disallowances, or that the regulatory process will always result in rates that will produce full recovery. Changes in the long-term cost-effectiveness or changes to the operating conditions of our assets may result in early retirements of utility facilities and while regulation typically provides relief for these types of changes, there is no assurance that regulators would allow full recovery of all remaining costs leaving all or a portion of these asset costs stranded. Higher than expected inflation or tariffs may increase costs of construction and operations. Rising fuel costs could increase the risk that our utility subsidiaries will not be able to fully recover their fuel costs from their customers. Furthermore, there could be changes in the regulatory environment that would impair the ability of our utility subsidiaries to recover costs historically collected from their customers, or these factors could cause the operating utilities to exceed commitments made regarding cost caps and result in less than full recovery. Overall, management currently believes prudently incurred costs are recoverable given the existing regulatory mechanisms in place.

Adverse regulatory rulings or the imposition of additional regulations could have an adverse impact on our results of operations and materially affect our ability to meet our financial obligations, including debt payments and the payment of dividends on our common stock.

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Any reductions in our credit ratings could increase our financing costs and the cost of maintaining certain contractual relationships.

We cannot be assured that our current ratings or our subsidiaries’ ratings will remain in effect, or that a rating will not be lowered or withdrawn by a rating agency. Significant events including disallowance of costs, significantly lower returns on equity or equity ratios or impacts of tax policy changes may impact our cash flows and credit metrics, potentially resulting in a change in our credit ratings. In addition, our credit ratings may change as a result of the differing methodologies or change in the methodologies used by the various rating agencies.

Any downgrade could lead to higher borrowing costs and could impact our ability to access capital markets. Also, our utility subsidiaries may enter into contracts that require the posting of collateral or settlement of applicable contracts if credit ratings fall below investment grade.

We are subject to capital market and interest rate risks.

Utility operations require significant capital investment. As a result, we frequently need to access capital markets. Any disruption in capital markets could have a material impact on our ability to fund our operations. Capital markets are global and impacted by issues and events throughout the world. Capital market disruption events and financial market distress could prevent us from issuing short-term commercial paper, issuing new securities or cause us to issue securities with unfavorable terms and conditions, such as higher interest rates.

Higher interest rates on short-term borrowings with variable interest rates could also have an adverse effect on our operating results. Changes in interest rates may also impact the fair value of the debt securities in the nuclear decommissioning and/or pension funds, as well as our ability to earn a return on short-term investments of excess cash.

We are subject to credit risks.

Credit risk includes the risk that our customers will not pay their bills, which may lead to a reduction in liquidity and an increase in bad debt expense. Credit risk is comprised of numerous factors including the price of products and services provided, the overall economy and local economies in the geographic areas we serve, including local unemployment rates.

Credit risk also includes the risk that various counterparties that owe us money or product will become insolvent and/or breach their obligations. Should the counterparties fail to perform, we may be forced to enter into alternative arrangements. In that event, our financial results could be adversely affected and incur losses.

We may at times have direct credit exposure in our short-term wholesale and commodity trading activity to financial institutions trading for their own accounts or issuing collateral support on behalf of other counterparties. We may also have some indirect credit exposure due to participation in organized markets, such as CAISO, SPP, PJM, MISO and Electric Reliability Council of Texas, in which any credit losses are socialized to all market participants.

We have additional indirect credit exposures to financial institutions in the form of letters of credit provided as security by power suppliers under various purchased power contracts. If any of the credit ratings of the letter of credit issuers were to drop below investment grade, the supplier would need to replace that security with an acceptable substitute. If the security were not replaced, the party could be in default under the contract.

Increasing costs of our defined benefit retirement plans and employee benefits may adversely affect our results of operations, financial condition or cash flows.

We have defined benefit pension and postretirement plans that cover most of our employees. Assumptions related to future costs, return on investments, interest rates and other actuarial assumptions have a significant impact on our funding requirements related to these plans. Estimates and assumptions may change. In addition, the Pension Protection Act changed the minimum funding requirements for defined benefit pension plans. Therefore, our funding requirements and related contributions may change in the future. Also, the payout of a significant percentage of pension plan liabilities in a single year due to high retirements or employees leaving could trigger settlement accounting and could require Xcel Energy to recognize incremental pension expense related to unrecognized plan losses in the year liabilities are paid.

Increasing costs associated with health care plans may adversely affect our results of operations.

Our self-insured costs of health care benefits for eligible employees have increased in recent years. Increasing levels of large individual health care claims and overall health care claims could have an adverse impact on our results of operations, financial condition or cash flows. Changes in industry standards utilized in key assumptions (e.g., mortality tables) could have a significant impact on future liabilities and benefit costs. Legislation related to health care could also significantly change our benefit programs and costs.

We must rely on cash from our subsidiaries to make dividend payments.

We are a holding company and investments in our subsidiaries are our primary assets. Substantially all of our operations are conducted by our subsidiaries. Consequently, our operating cash flow and ability to service our debt and pay dividends depends upon the operating cash flows of our subsidiaries and their payment of dividends. Our subsidiaries are separate legal entities that have no obligation to pay any amounts due pursuant to our obligations or to make any funds available for dividends on our common stock. In addition, each subsidiary’s ability to pay dividends depends on statutory and/or contractual restrictions which may include requirements to maintain minimum levels of equity ratios, working capital or assets. Also, our utility subsidiaries are regulated by state utility commissions, which possess broad powers to ensure that the needs of the utility customers are being met.

If our utility subsidiaries were to cease making dividend payments, our ability to pay dividends on our common stock or otherwise meet our financial obligations could be adversely affected.

Federal tax law may significantly impact our business.

Xcel Energy’s utility subsidiaries collect through regulated rates estimated federal, state and local tax payments. Changes to federal tax law may benefit or adversely affect our earnings and customer costs. Changes to tax depreciable lives and the value of various tax credits may change the economics of resources and our resource selections. There could be timing delays before regulated rates provide for realization of the tax changes in revenues. In addition, certain IRS tax policies such as the requirement to utilize normalization may impact our ability to economically deliver certain types of resources relative to market prices.

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Macroeconomic Risks

Economic conditions impact our business.

Our operations are affected by local, national and worldwide economic conditions. Growth in customers and sales are correlated with economic conditions.

Economic conditions may be impacted by insufficient financial sector liquidity leading to potential increased unemployment, which may impact customers’ ability to pay timely, increase customer bankruptcies, and may lead to additional bad debt expense.

Further, worldwide economic activity impacts the demand for basic commodities necessary for utility infrastructure, which may impact our ability to acquire sufficient supplies. We operate in a capital intensive industry and federal policy on trade could significantly impact the cost of materials we use. We could be at risk for higher costs for materials and our workforce. There may be delays before these additional costs can be recovered in rates.

Our operations could be impacted by war, acts of terrorism, and threats of terrorism or disruptions due to events.

Our generation plants, fuel storage facilities, transmission and distribution facilities and information and control systems may be targets of terrorist activities. Any disruption could impact operations or result in a decrease in revenues and additional costs to repair and insure our assets. These disruptions could have a material impact on our financial condition, results of operations or cash flows. The potential for terrorism has subjected our operations to increased risks and could have a material effect on our business. We have already incurred increased costs for security and capital expenditures in response to these risks.

The insurance industry has also been affected by these events and the availability of insurance may decrease. In addition, insurance may have higher deductibles, higher premiums and more restrictive policy terms.

A disruption of the regional electric transmission grid, interstate natural gas pipeline infrastructure or other fuel sources, could negatively impact our business, our brand and reputation. Because our facilities are part of an interconnected system, we face the risk of possible loss of business due to a disruption caused by the actions of a neighboring utility or an event (e.g., severe storm, severe temperature extremes, wildfires, generator or transmission facility outage, pipeline rupture, railroad disruption, operator error, sudden and significant increase or decrease in wind generation or a disruption of work force) within our operating systems or on a neighboring system. Any such disruption could result in a significant decrease in revenues and significant additional costs to repair assets, which could have a material impact on our results of operations, financial condition or cash flows.

A cyber incident or security breach could have a material effect on our business.

We operate in an industry that requires the continued operation of sophisticated information technology, control systems and network infrastructure. In addition, we use our systems and infrastructure to create, collect, use, disclose, store, dispose of and otherwise process sensitive information, including company data, customer energy usage data, and personal information regarding customers, employees and their dependents, contractors, shareholders and other individuals.

Our generation, transmission, distribution and fuel storage facilities, information technology systems and other infrastructure or physical assets, as well as information processed in our systems (e.g., information regarding our customers, employees, operations, infrastructure and assets) could be affected by cyber security incidents, including those caused by human error.

Our industry has begun to see an increased volume and sophistication of cyber security incidents from international activist organizations, Nation States and individuals. Cyber security incidents could harm our businesses by limiting our generating, transmitting and distributing capabilities, delaying our development and construction of new facilities or capital improvement projects to existing facilities, disrupting our customer operations or causing the release of customer information, all of which could expose us to liability.

Our generation, transmission systems and natural gas pipelines are part of an interconnected system. Therefore, a disruption caused by the impact of a cyber security incident of the regional electric transmission grid, natural gas pipeline infrastructure or other fuel sources of our third party service providers’ operations, could also negatively impact our business.

Our supply chain for procurement of digital equipment may expose software or hardware to these risks and could result in a breach or significant costs of remediation. In addition, such an event would likely receive federal and state regulatory scrutiny. We are unable to quantify the potential impact of cyber security threats or subsequent related actions. These potential cyber security incidents and regulatory action could result in a material decrease in revenues and may causesignificant additional costs (e.g., penalties, third party claims, repairs, insurance or compliance) and potentially disrupt our supply and markets for natural gas, oil and other fuels.

We maintain security measures to protect our information technology and control systems, network infrastructure and other assets. However, these assets and the information they process may be vulnerable to cyber security incidents, including the resulting disability, or failures of assets or unauthorized access to assets or information. If our technology systems or those of our third-party service providers were to fail or be breached, we may be unable to fulfill critical business functions. We are unable to quantify the potential impact of cyber security incidents on our business, our brand, and our reputation. The cyber security threat is dynamic and evolves continually, and our efforts to prioritize network monitoring may not be effective given the constant changes to threat vulnerability.

Our operating results may fluctuate on a seasonal and quarterly basis and can be adversely affected by milder weather.

Our electric and natural gas utility businesses are seasonal and weather patterns can have a material impact on our operating performance. Demand for electricity is often greater in the summer and winter months associated with cooling and heating. Because natural gas is heavily used for residential and commercial heating, the demand depends heavily upon weather patterns. A significant amount of natural gas revenues are recognized in the first and fourth quarters related to the heating season. Accordingly, our operations have historically generated less revenues and income when weather conditions are milder in the winter and cooler in the summer. Unusually mild winters and summers could have an adverse effect on our financial condition, results of operations or cash flows.

Our operations use third party contractors in addition to employees to perform periodic and on-going work.

We rely on third party contractors to perform work for operations, maintenance and construction. We have contractual arrangements with these contractors which typically include performance standards, progress payments, insurance requirements and security for performance.

Cyber security breaches have at times exploited third party equipment or software in order to gain access. Poor vendor performance could impact on going operations, restoration operations, our reputation and could introduce financial risk or risks of fines.

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Public Policy Risks

We may be subject to legislative and regulatory responses to climate change, with which compliance could be difficult and costly.

Legislative and regulatory responses related to climate change and new interpretations of existing laws create financial risk as our facilities may be subject to additional regulation at either the state or federal level in the future. Such regulations could impose substantial costs on our system.

We may be subject to climate change lawsuits. An adverse outcome could require substantial capital expenditures and could possibly require payment of substantial penalties or damages. Defense costs associated with such litigation can also be significant. Such payments or expenditures could affect results of operations, financial condition or cash flows if such costs are not recovered through regulated rates.

Although the United States has not adopted any international or federal GHG emission reduction targets, many states and localities may continue to pursue climate policies in the absence of federal mandates. All of the steps that Xcel Energy has taken to date to reduce GHG emissions, including energy efficiency measures, adding renewable generation or retiring or converting coal plants to natural gas, occurred under state-endorsed resource plans, renewable energy standards and other state policies. While those actions likely would have put Xcel Energy in a good position to meet federal or international standards being discussed, the lack of federal action does not adversely impact these state-endorsed actions and plans.

If our regulators do not allow us to recover all or a part of the cost of capital investment or the O&M costs incurred to comply with the mandates, it could have a material effect on our results of operations, financial condition or cash flows.

Increased risks of regulatory penalties could negatively impact our business.

The Energy Act increased civil penalty authority for violation of FERC statutes, rules and orders. The FERC can impose penalties of up to $1.3 million per violation per day, particularly as it relates to energy trading activities for both electricity and natural gas. In addition, NERC electric reliability standards and critical infrastructure protection requirements are mandatory and subject to potential financial penalties. Additionally, the PHMSA, Occupational Safety and Health Administration and other federal agencies have penalty authority. In the event of serious incidents, these agencies have become more active in pursuing penalties. Some states have the authority to impose substantial penalties. If a serious reliability or safety incident did occur, it could have a material effect on our results of operations, financial condition or cash flows.

Environmental Risks

We are subject to environmental laws and regulations, with which compliance could be difficult and costly.

We are subject to environmental laws and regulations that affect many aspects of our operations, including air emissions, water quality, wastewater discharges and the generation, transport and disposal of solid wastes and hazardous substances. Laws and regulations require us to obtain permits, licenses, and approvals and to comply with a variety of environmental requirements.

Environmental laws and regulations can also require us to restrict or limit the output of facilities or the use of certain fuels, shift generation to lower-emitting, install pollution control equipment, clean up spills and other contamination and correct environmental hazards. Environmental regulations may also lead to shutdown of existing facilities.

Failure to meet requirements of environmental mandates may result in fines or penalties. We may be required to pay all or a portion of the cost to remediate (i.e., clean-up) sites where our past activities, or the activities of other parties, caused environmental contamination.

We are subject to mandates to provide customers with clean energy, renewable energy and energy conservation offerings. It could have a material effect on our results of operations, financial condition or cash flows if our regulators do not allow us to recover the cost of capital investment or the O&M costs incurred to comply with the requirements.

In addition, existing environmental laws or regulations may be revised and new laws or regulations may be adopted. We may also incur additional unanticipated obligations or liabilities under existing environmental laws and regulations.

We are subject to physical and financial risks associated with climate change and other weather, natural disaster and resource depletion impacts.

Climate change can create physical and financial risk. Physical risks include changes in weather conditions and extreme weather events.

Our customers’ energy needs vary with weather. To the extent weather conditions are affected by climate change, customers’ energy use could increase or decrease. Increased energy use due to weather changes may require us to invest in generating assets, transmission and infrastructure. Decreased energy use due to weather changes may result in decreased revenues. Extreme weather conditions in general require system backup, costs, and can contribute to increased system stress, including service interruptions. Extreme weather conditions creating high energy demand may raise electricity prices, increasing the cost of energy we provide to our customers.

Severe weather impacts our service territories, primarily when thunderstorms, flooding, tornadoes, wildfires and snow or ice storms occur. To the extent the frequency of extreme weather events increases, this could increase our cost of providing service. Periods of extreme temperatures could impact our ability to meet demand. Changes in precipitation resulting in droughts or water shortages could adversely affect our operations. Drought conditions also contribute to the increase in wildfire risk from our electric generation facilities. While we carry liability insurance, given an extreme event, if Xcel Energy was found to be liable for wildfire damages, amounts that potentially exceed our coverage could negatively impact our results of operations, financial condition or cash flows. Drought or water depletion could adversely impact our ability to provide electricity to customers and increase the price paid for energy. We may not recover all costs related to mitigating these physical and financial risks.

Climate change may impact a region’s economy, which could impact our sales and revenues. The price of energy has an impact on the economic health of our communities. The cost of additional regulatory requirements, such as regulation of GHG, could impact the availability of goods and prices charged by our suppliers which would normally be borne by consumers through higher prices for energy and purchased goods. To the extent financial markets view climate change and emissions of GHGs as a financial risk, this could negatively affect our ability to access capital markets or cause us to receive less than ideal terms and conditions.

Item 1B — Unresolved Staff Comments

None.

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Item 2 — Properties

Virtually all of the utility plant property of NSP-Minnesota, NSP-Wisconsin, SPS and PSCo is subject to the lien of their first mortgage bond indentures.

Electric Generating Stations:

NSP-Minnesota Station, Location and Unit	Fuel	Installed	MW (a)
Steam:
A.S. King-Bayport, MN, 1 Unit	Coal	1968	511
Sherco-Becker, MN
Unit 1	Coal	1976	680
Unit 2	Coal	1977	682
Unit 3	Coal	1987	517	(b)
Monticello, MN, 1 Unit	Nuclear	1971	617
PI-Welch, MN
Unit 1	Nuclear	1973	521
Unit 2	Nuclear	1974	519
Various locations, 4 Units	Wood/Refuse	Various	36	(c)
Combustion Turbine:
Angus Anson-Sioux Falls, SD, 3 Units	Natural Gas	1994 - 2005	327
Black Dog-Burnsville, MN, 3 Units	Natural Gas	1987 - 2002	494	(d)
Blue Lake-Shakopee, MN, 6 Units	Natural Gas	1974 - 2005	453
High Bridge-St. Paul, MN, 3 Units	Natural Gas	2008	530
Inver Hills-Inver Grove Heights, MN, 6 Units	Natural Gas	1972	282
Riverside-Minneapolis, MN, 3 Units	Natural Gas	2009	454
Various locations, 14 Units	Natural Gas	Various	67
Wind:
Border-Rolette County, ND, 75 Units	Wind	2015	148	(e)
Courtenay Wind, ND, 100 Units	Wind	2016	195	(e)
Grand Meadow-Mower County, MN, 67 Units	Wind	2008	101	(e)
Nobles-Nobles County, MN., 134 Units	Wind	2010	200	(e)
Pleasant Valley-Mower County, MN, 100 Units	Wind	2015	196	(e)
		Total	7,530

^(a)  Summer 2018 net dependable capacity.

^(b)  Based on NSP-Minnesota’s ownership of 59%.

^(c)  Refuse-derived fuel is made from municipal solid waste.

^(d)  Black Dog Unit 6 was commissioned and placed into operation in the third quarter of 2018.

^(e)  Values disclosed are the maximum generation levels for these wind units. Capacity is attainable only when wind conditions are sufficiently available (on-demand net dependable capacity is zero).

NSP-Wisconsin Station, Location and Unit	Fuel	Installed	MW (a)
Steam:
Bay Front-Ashland, WI, 3 Units	Coal/Wood/Natural Gas	1948 - 1956	56
French Island-La Crosse, WI, 2 Units	Wood/Refuse	1940 - 1948	16	(b)
Combustion Turbine:
French Island-La Crosse, WI, 2 Units	Oil	1974	122
Wheaton-Eau Claire, WI, 5 Units	Natural Gas/Oil	1973	234
Hydro:
Various locations, 63 Units	Hydro	Various	135
		Total	563

^(a)  Summer 2018 net dependable capacity.

^(b)  Refuse-derived fuel is made from municipal solid waste.

PSCo Station, Location and Unit	Fuel	Installed	MW (a)
Steam:
Comanche-Pueblo, CO (b)
Unit 1	Coal	1973	325
Unit 2	Coal	1975	335
Unit 3	Coal	2010	500	(c)
Craig-Craig, CO, 2 Units (d)	Coal	1979 - 1980	82	(e)
Hayden-Hayden, CO, 2 Units	Coal	1965 - 1976	233	(f)
Pawnee-Brush, CO, 1 Unit	Coal	1981	505
Cherokee-Denver, CO, 1 Unit	Natural Gas	1968	310
Combustion Turbine:
Blue Spruce-Aurora, CO, 2 Units	Natural Gas	2003	264
Cherokee-Denver, CO, 3 Units	Natural Gas	2015	576
Fort St. Vrain-Platteville, CO, 6 Units	Natural Gas	1972 - 2009	968
Rocky Mountain-Keenesburg, CO, 3 Units	Natural Gas	2004	580
Various locations, 6 Units	Natural Gas	Various	171
Hydro:
Cabin Creek-Georgetown, CO
Pumped Storage, 2 Units	Hydro	1967	210
Various locations, 9 Units	Hydro	Various	26
Wind:
Rush Creek, CO, 300 units	Wind	2018	600	(g)
		Total	5,685

^(a)  Summer 2018 net dependable capacity.

^(b)  In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in 2022 and 2025, respectively.

^(c)  Based on PSCo’s ownership of 67%.

^(d)  Craig Unit 1 is expected to be retired early in 2025.

^(e)  Based on PSCo’s ownership of 10%.

^(f)  Based on PSCo’s ownership of 75% of Unit 1 and 37% of Unit 2.

^(g)  Generation capability is based on the maximum output level of wind units, including the Rush Creek Wind Project. Capacity is attainable only when wind conditions are sufficiently available (on-demand net dependable capacity is zero).

SPS Station, Location and Unit	Fuel	Installed	MW (a)
Steam:
Cunningham-Hobbs, NM, 2 Units	Natural Gas	1957 - 1965	251
Harrington-Amarillo, TX, 3 Units	Coal	1976 - 1980	1,018
Jones-Lubbock, TX, 2 Units	Natural Gas	1971 - 1974	486
Maddox-Hobbs, NM, 1 Unit	Natural Gas	1967	112
Nichols-Amarillo, TX, 3 Units	Natural Gas	1960 - 1968	457
Plant X-Earth, TX, 4 Units	Natural Gas	1952 - 1964	411
Tolk-Muleshoe, TX, 2 Units	Coal	1982 - 1985	1,067
Combustion Turbine:
Cunningham-Hobbs, NM, 2 Units	Natural Gas	1998	209
Jones-Lubbock, TX, 2 Units	Natural Gas	2011 - 2013	334
Maddox-Hobbs, TX, 1 Unit	Natural Gas	1963 - 1976	61
		Total	4,406

^(a)  Summer 2018 net dependable capacity.

24

Electric utility overhead and underground transmission and distribution lines (measured in conductor miles) at Dec. 31, 2018:

Conductor Miles	NSP-Minnesota	NSP-Wisconsin	PSCo	SPS
500 KV	2,917	—	—	—
345 KV	13,560	3,415	4,062	9,028
230 KV	2,202	—	12,053	9,675
161 KV	615	1,823	—	—
138 KV	—	—	91	—
115 KV	7,372	1,817	5,051	14,493
Less than 115 KV	86,185	32,831	78,446	25,820

Electric utility transmission and distribution substations at Dec. 31, 2018:

	NSP-Minnesota	NSP-Wisconsin	PSCo	SPS
Quantity	348	203	232	459

Natural gas utility mains at Dec. 31, 2018:

Miles	NSP-Minnesota	NSP-Wisconsin	PSCo	SPS	WGI
Transmission	90	3	2,080	20	11
Distribution	10,437	2,466	22,518	—	—

Item 3 — Legal Proceedings

Xcel Energy is involved in various litigation matters that are being defended and handled in the ordinary course of business. Assessment of whether a loss is probable or is a reasonable possibility, and whether a loss or a range of loss is estimable, often involves a series of complex judgments regarding future events. Management maintains accruals for losses that are probable of being incurred and subject to reasonable estimation. Management may be unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to, when (1) damages sought are indeterminate, (2) proceedings are in the early stages or (3) matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss.

See Note 12 to the consolidated financial statements, Item 1 and Item 7 for further information.

Item 4 — Mine Safety Disclosures

None.

PART II

Item 5 — Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Stock Data

Xcel Energy Inc.’s common stock was listed on the New York Stock Exchange (NYSE) in 2017, but moved to the Nasdaq Global Select Market (Nasdaq) in 2018. The trading symbol is XEL. The number of common stockholders of record as of Dec. 31, 2018 was approximately 57,059.

See Item 7 for further information.

The following compares our cumulative TSR on common stock with the cumulative TSR of the EEI Investor-Owned Electrics Index and the Standard & Poor’s 500 Composite Stock Price Index over the last five years (assuming a $100 investment on Dec. 31, 2013, and the reinvestment of all dividends).

The EEI Investor-Owned Electrics Index (market capitalization-weighted) included 42 companies at year-end and is a broad measure of industry performance.

COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN*

Xcel Energy Inc., the EEI Investor-Owned Electrics and the Standard & Poor’s 500

* $100 invested on Dec. 31, 2013 in stock or index — including reinvestment of dividends. Fiscal years ended Dec. 31.

25

Securities Authorized for Issuance Under Equity Compensation Plans

Information required under Item 5 — Securities Authorized for Issuance Under Equity Compensation Plans is contained in Xcel Energy Inc.’s Proxy Statement for its 2018 Annual Meeting of Shareholders, which is incorporated by reference.

Purchases of Equity Securities by Issuer and Affiliated Purchasers

For the quarter ended Dec. 31, 2018, no equity securities that are registered by Xcel Energy Inc. pursuant to Section 12 of the Securities Exchange Act of 1934 were purchased by or on behalf of us or any of our affiliated purchasers.

Item 6 — Selected Financial Data

Selected financial data for Xcel Energy related to the five most recent years ended Dec. 31.     

(Millions of Dollars, Millions of Shares, Except Per Share Data)	2018		2017		2016		2015		2014
Operating revenues	$	11,537	$	11,404	$	11,107	$	11,024	$	11,686
Operating expenses (a)	9,572		9,181		8,867		9,024		9,738
Net income	1,261		1,148		1,123		984		1,021
Earnings available to common shareholders	1,261		1,148		1,123		984		1,021
Diluted earnings per common share	2.47		2.25		2.21		1.94		2.03
Financial information
Dividends declared per common share	1.52		1.44		1.36		1.28		1.20
Total assets (b) (c)	45,987		43,030		41,155		38,821		36,958
Long-term debt (c)(d)	15,803		14,520		14,195		12,399		11,500

^(a)  As a result of adopting ASU No. 2017-07 (Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, Topic 715), $33 million and $26 million of pension costs were retrospectively reclassified from operating and maintenance expenses to other income, net on the consolidated statements of income for the years ended Dec. 31, 2017 and Dec. 31, 2016, respectively.

^(b)  As a result of adopting ASU No. 2015-17 (Balance Sheet Classification of Deferred Taxes, Topic 740), $140 million of current deferred income taxes was retrospectively reclassified to long-term deferred income tax liabilities on the consolidated balance sheet as of Dec. 31, 2015.

^(c)  As a result of adopting ASU No. 2015-03 (Simplifying the Presentation of Debt Issuance Costs, Subtopic 835-30), $92 million of deferred debt issuance costs was retrospectively reclassified from other non-current assets to long-term debt on the consolidated balance sheet as of Dec. 31, 2015.

^(d)  Includes capital lease obligations.

Item 7 — Management’s Discussion and Analysis of Financial Condition and Results of Operations

Business Segments and Organizational Overview

Xcel Energy Inc. is a public utility holding company. Xcel Energy’s operations include the activity of four utility subsidiaries that serve electric and natural gas customers in eight states. The utility subsidiaries serve customers in portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. Along with the utility subsidiaries, the TransCo subsidiaries, WYCO (a joint venture formed with CIG to develop and lease natural gas pipelines, storage and compression facilities) and WGI (an interstate natural gas pipeline company) comprise the regulated utility operations.

Xcel Energy Inc.’s immaterial nonregulated subsidiaries are Eloigne and Capital Services.

Management’s Strategic Priorities

Xcel Energy’s vision is to be the preferred and trusted provider of the energy our customers need. We strive to provide our investors an attractive value proposition and our customers with safe, clean and reliable energy services at a competitive price. This mission is enabled via three key strategic priorities:

• Lead the clean energy transition;

• Enhance the customer experience; and,

• Keep bills low.

Successful execution of our strategic objectives should allow Xcel Energy to continue to deliver a competitive total return for our shareholders.

Lead the clean energy transition

For more than a decade, we have managed the risk of climate change and increasing customer demand for renewable energy through a clean energy strategy that consistently reduces carbon emissions and transitions our operations for the future. As a result, we have successfully reduced our carbon emissions to our customers by approximately 40% from 2005 to 2018. We expect to reduce our carbon footprint by 80% by 2030 (over 2005 levels). We have also announced our vision to serve all customers with 100% zero-carbon emissions by 2050.

Our service territories benefit from the geographic concentration of favorable renewable resources. Strong wind and high solar irradiance yield high generation capacity factors, which lowers the cost of these resources. The combination of high capacity factors, grid options from transmission investment and market operations, improved supply chain, technological improvements and the extension of the renewable tax credits translates into low renewable energy costs for our customers. As a result, we are able to invest in renewable generation, in which the capital costs are largely or completely offset by fuel savings. This provides us the opportunity to lower the emission profile of our generation fleet, grow our renewable portfolio and provide significant fuel savings to our customers. We call this our “Steel for Fuel” strategy.

26

We are transitioning how we produce, deliver and encourage the efficient use of energy through four primary mechanisms:

• Increasing the use of affordable renewable energy;

• Offering energy efficiency programs for customers;

• Retiring or repowering coals units and modernizing our generating plants; and,

• Advancing power grid capabilities.

We have announced ambitious plans to add approximately 3,600 MW of wind energy on our system by 2021.

In addition, the proposed CEP in Colorado encompasses the retirement of 660 MW from two coal-fired units at Comanche and the addition of up to 1,100 MW of wind, 700 MW of solar and 275 MW of battery storage.

Enhance the customer experience

The utility landscape is changing, and we must continue to thoughtfully anticipate and address the future needs of our stakeholders, including our customers, policymakers, employees and shareholders. Our customers expect to have choices, and we are committed to providing options and solutions that they want and value at a competitive price.

We will continue to expand our production of renewable energy, including wind and solar alternatives, and further develop and promote DSM, conservation and renewable programs. We are also in the process of transforming our transmission and distribution systems to accommodate increased levels of renewables, distributed energy resources and corresponding data growth, while maintaining high levels of reliability and security and keeping customer bills affordable. We also are expanding our Renewable*Connect program, which allows customers to choose how much of their energy comes from renewable sources. Renewable*Connect has regulatory approval in Minnesota, Colorado and Wisconsin. This is yet another way for us to add renewable energy and meet the needs of our customers. Importantly, Renewable*Connect does not negatively impact the bills of non-participants. Finally, we are improving our communications to enable customers to interact with us in the way they prefer.

Keep bills low

Xcel Energy is very focused on our customers and the impact our actions have on their bill. Our objective is to keep total bill increases at or below the rate of inflation so our prices remain competitive relative to alternatives. We expect to continue to keep our customer bills low by executing on our Steel for Fuel plan, controlling O&M costs and promoting energy efficiency and conservation.

Xcel Energy is working to keep long-term O&M expense relatively consistent without compromising reliability or safety. We intend to accomplish this objective by continually improving our processes, leveraging technology, proactively managing risk and maintaining a workforce that is prepared to meet the needs of our business today and tomorrow. In 2018, we experienced warmer than normal summer weather, which caused us to spend additional O&M for vegetation management and system maintenance due to the hot summer, business systems costs, investments to improve and enhance business processes and customer service, as well as damage prevention and remediation costs. However, we remain committed to our long-term objective of improving operating efficiencies and taking costs out of the business for the benefit of our customers and anticipate that our long-term O&M expense trend will remain relatively consistent.

Provide a competitive total return to investors and maintain strong investment grade credit rating

Through our disciplined approach to business growth, financial investment, operations and safety, we plan to:

• Deliver long-term annual EPS growth of 5% to 7%;

• Deliver annual dividend increases of 5% to 7%;

• Target a dividend payout ratio of 60% to 70% of annual ongoing EPS; and,

• Maintain senior secured debt credit ratings in the A range and senior unsecured debt credit ratings in the BBB+ to A range.

We have consistently achieved our financial objectives, meeting or exceeding our earnings guidance range for fourteen consecutive years, and we believe we are positioned to continue to deliver on our value proposition. Our ongoing earnings have grown approximately 6.1% and our dividend has grown approximately 4.5% annually from 2005 - 2018. In addition, our current senior unsecured debt credit ratings for Xcel Energy and its utility subsidiaries are in the BBB+ to A range, while our secured operating company debt ratings are in the A range.

Non-GAAP Financial Measures

The following discussion includes financial information prepared in accordance with GAAP, as well as certain non-GAAP financial measures such as the ongoing return on equity (ROE), electric margin, natural gas margin, ongoing earnings and ongoing diluted EPS. Generally, a non-GAAP financial measure is a measure of a company’s financial performance, financial position or cash flows that excludes (or includes) amounts that are adjusted from measures calculated and presented in accordance with GAAP. Xcel Energy’s management uses non-GAAP measures for financial planning and analysis, for reporting of results to the Board of Directors, in determining performance-based compensation, and communicating its earnings outlook to analysts and investors. Non-GAAP financial measures are intended to supplement investors’ understanding of our performance and should not be considered alternatives for financial measures presented in accordance with GAAP. These measures are discussed in more detail below and may not be comparable to other companies’ similarly titled non-GAAP financial measures.

Ongoing ROE

Ongoing ROE is calculated by dividing the net income or loss of Xcel Energy or each subsidiary, adjusted for certain nonrecurring items, by each entity’s average stockholder’s equity. We use these non-GAAP financial measures to evaluate and provide details of earnings results.

Electric and Natural Gas Margins

Electric margin is presented as electric revenues less electric fuel and purchased power expenses. Natural gas margin is presented as natural gas revenues less the cost of natural gas sold and transported. Expenses incurred for electric fuel and purchased power and the cost of natural gas are generally recovered through various regulatory recovery mechanisms. As a result, changes in these expenses are generally offset in operating revenues.

Management believes electric and natural gas margins provide the most meaningful basis for evaluating our operations because they exclude the revenue impact of fluctuations in these expenses. These margins can be reconciled to operating income, a GAAP measure, by including other operating revenues, cost of sales-other, O&M expenses, conservation and DSM expenses, depreciation and amortization and taxes (other than income taxes).

27

Earnings Adjusted for Certain Items (Ongoing Earnings and Ongoing Diluted EPS)

GAAP diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock (i.e., common stock equivalents) were settled. The weighted average number of potentially dilutive shares outstanding used to calculate Xcel Energy Inc.’s diluted EPS is calculated using the treasury stock method. Ongoing earnings reflect adjustments to GAAP earnings (net income) for certain items. Ongoing diluted EPS is calculated by dividing the net income or loss of each subsidiary, adjusted for certain items, by the weighted average fully diluted Xcel Energy Inc. common shares outstanding for the period. Ongoing diluted EPS for each subsidiary is calculated by dividing the net income or loss of such subsidiary, adjusted for certain items, by the weighted average fully diluted Xcel Energy Inc. common shares outstanding for the period.

We use these non-GAAP financial measures to evaluate and provide details of Xcel Energy’s core earnings and underlying performance. We believe these measurements are useful to investors to evaluate the actual and projected financial performance and contribution of our subsidiaries. For the year ended Dec. 31, 2017, Xcel Energy recognized an estimated one-time, non-cash, income tax expense of approximately $23 million for net excess deferred tax assets which may not be recovered from customers or not attributable to regulated operations, increased valuation allowances, etc. due to the enactment of the TCJA in December 2017. For the year ended Dec. 31, 2018, there were no such adjustments to GAAP earnings and therefore GAAP earnings equal ongoing earnings.

See Note 7 to the consolidated financial statements for further information.

Results of Operations

Diluted EPS for Xcel Energy at Dec. 31:

	2018			2017									2016
Diluted Earnings (Loss) Per Share	GAAP and Ongoing Diluted EPS			GAAP Diluted EPS			Impact of TCJA (a)			Ongoing Diluted EPS			GAAP and Ongoing Diluted EPS
PSCo	$	1.08		$	0.97		$	(0.03	)	$	0.94		$	0.91
NSP-Minnesota	0.96			0.96			0.05			1.01			0.96
SPS	0.42			0.31			(0.01		)	0.30			0.30
NSP-Wisconsin	0.19			0.16			—			0.16			0.14
Equity earnings of unconsolidated subsidiaries (a)	0.04			0.07			(0.04		)	0.03			0.05
Regulated utility (b)	2.69			2.47			(0.03		)	2.45			2.35
Xcel Energy Inc. and other	(0.22		)	(0.22		)	0.07			(0.15		)	(0.15		)
Total (b)	$	2.47		$	2.25		$	0.05		$	2.30		$	2.21

^(a)  Includes income taxes.

^(b)  Amounts may not add due to rounding.

Xcel Energy’s management believes that ongoing earnings reflects management’s performance in operating the company and provides a meaningful representation of the performance of Xcel Energy’s core business. In addition, Xcel Energy’s management uses ongoing earnings internally for financial planning and analysis, reporting results to the Board of Directors and when communicating its earnings outlook to analysts and investors.

Earnings Adjusted for Certain Items

2018 Comparison with 2017

2017 Adjustment to GAAP Earnings — Impact of the TCJA — Xcel Energy recognized an estimated one-time, non-cash, income tax expense of approximately $23 million in the fourth quarter of 2017 for net excess deferred tax assets which may not be recovered from customers or not attributable to regulated operations, increased valuation allowances, etc. due to the enactment of the TCJA in December 2017. The income tax expense associated with the TCJA enactment has been excluded from Xcel Energy’s 2017 ongoing earnings, given the non-recurring nature of the TCJA’s broad and sweeping reform of the IRC.

See Note 7 to the consolidated financial statements for further information.

Differences between GAAP and ongoing earnings are due to the non-recurring impact of the TCJA experienced in 2017. Explanations for operating company results below exclude the offsetting impacts of the TCJA on sales, depreciation and amortization expense and income tax.

Xcel Energy — GAAP and ongoing earnings increased$0.22 and $0.17 per share, respectively. Earnings increased as a result of higher electric and natural gas revenues primarily due to favorable weather and sales growth and higher AFUDC. These positive factors were partially offset by increased O&M, depreciation and interest expenses. GAAP earnings for 2017 include the non-recurring negative impact of the TCJA.

PSCo — GAAP and ongoing 2018 earnings increased $0.11 and $0.14 per share, respectively. Increases were driven by higher natural gas margins largely due to a natural gas rate increase, higher electric margins reflecting favorable weather and sales growth, and additional AFUDC associated with the Rush Creek wind project. These items were partially offset by higher O&M expenses, interest charges, depreciation expense and property taxes.

NSP-Minnesota — 2018 GAAP earnings were consistent with 2017, while 2018 ongoing earnings decreased$0.05 per share. The decrease in ongoing earnings reflects higher depreciation expense and O&M expenses. These amounts were partially offset by higher electric and natural gas margins attributable to favorable weather.

SPS — 2018 GAAP and ongoing earnings increased$0.11 and $0.12 per share, respectively. Increases were primarily due to higher electric margins reflecting favorable weather and sales growth and a rate increase in New Mexico, AFUDC related to the Hale County wind project and lower interest charges. Increases were partially offset by higher depreciation expense.

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NSP-Wisconsin — 2018 GAAP and ongoing earnings increased$0.03 per share. Increases reflect higher electric and natural gas rates and the impact of favorable weather and sales growth, which were partially offset by higher depreciation.

Xcel Energy Inc. and other — Xcel Energy Inc. and other primarily includes financing costs at the holding company. 2018 GAAP earnings were consistent with 2017, while 2018 ongoing earnings decreased$0.07 per share. Decrease was primarily due to higher interest expense related to additional debt and the change in the federal income tax rate.

2017 Comparison with 2016

Xcel Energy — GAAP earnings increased $0.04 per share for 2017. Ongoing earnings increased $0.09 per share, excluding the impact of the TCJA. Earnings were higher as a result of increased electric and natural gas margins to recover infrastructure investments, reduced O&M expenses, a lower ETR and higher AFUDC. These positive factors were partially offset by increased depreciation expense, interest charges and property taxes.

PSCo — GAAP earnings increased $0.06 per share for 2017. Ongoing earnings increased $0.03 per share, excluding the impact of the TCJA. The increase in earnings was driven by higher electric and natural gas margins, increased AFUDC primarily related to the Rush Creek wind project, a decrease in O&M expenses (timing of generation outages) and a lower ETR, partially offset by higher depreciation expense, interest charges and the impact of unfavorable weather.

NSP-Minnesota — GAAP earnings were flat for 2017. Ongoing earnings increased $0.05 per share, excluding the impact of the TCJA. The change reflects higher electric margins driven by a 2017 Minnesota rate increase as well as increased gas margins, a lower ETR and reduced O&M expenses. These positive factors were partially offset by higher depreciation expense due to increased invested capital as well as prior year amortization of Minnesota’s excess depreciation reserve and higher property taxes.

SPS — GAAP earnings increased $0.01 per share for 2017. Ongoing earnings were flat, excluding the impact of the TCJA. Rate increases in Texas and New Mexico and a lower ETR were offset by higher depreciation expense (representing continued investment), O&M expenses (including the prior year deferrals associated with the Texas 2016 rate case), property taxes and the impact of unfavorable weather.

NSP-Wisconsin — GAAP and ongoing earnings increased $0.02 per share for 2017. The change in ongoing earnings was driven by a rise in electric and natural gas rates, partially offset by additional depreciation expense related to continued transmission and distribution investments and higher O&M expenses.

Equity earnings of unconsolidated subsidiaries — GAAP earnings increased $0.02 per share for 2017. Ongoing earnings of unconsolidated subsidiaries decreased $0.02 per share, excluding the impact of the TCJA. The decline primarily related to lower revenues due to lower rates at WYCO.

Changes in Diluted EPS

Components significantly contributing to changes in 2018 EPS compared with the same period in 2017 and 2017 EPS compared to 2016:

2018 vs. 2017
Diluted Earnings (Loss) Per Share	Dec. 31
GAAP diluted EPS — 2017	$	2.25
Impact of the TCJA (a)	0.05
Ongoing diluted EPS — 2017	$	2.30
Components of change — 2018 vs. 2017
Higher electric margins (excluding TCJA impacts) (a)	0.31
Higher natural gas margins (excluding TCJA impacts) (a)	0.13
Higher AFUDC — equity	0.07
Higher O&M expenses	(0.10		)
Higher depreciation and amortization (excluding TCJA impacts) (a)	(0.10		)
Higher ETR (excluding TCJA impacts) (a)	(0.07		)
Higher interest charges	(0.04		)
Higher conservation and demand side management (DSM) program expenses (offset by higher revenues)	(0.02		)
Higher taxes (other than income taxes)	(0.01		)
GAAP and ongoing diluted EPS — 2018	$	2.47
Estimated net impact of the TCJA, including assumptions regarding future regulatory proceedings: (a)
Income tax — rate change and ARAM (net of deferral)	0.68
Electric margin reductions (net)	(0.46		)
Natural gas margin reductions (net)	(0.06		)
Depreciation and amortization reductions (Colorado prepaid pension)	(0.11		)
Holding company — interest expense	(0.04		)
Total	$	0.01

2017 vs. 2016
Diluted Earnings (Loss) Per Share	Dec. 31
GAAP and ongoing diluted EPS — 2016	$	2.21
Components of change — 2017 vs. 2016
Higher electric margins (a)	0.16
Lower ETR (b)	0.07
Higher natural gas margins	0.03
Higher AFUDC — equity	0.03
Lower O&M expenses	0.03
Higher depreciation and amortization	(0.21		)
Higher conservation and DSM program expenses (c)	(0.03		)
Higher interest charges	(0.02		)
Higher taxes (other than income taxes)	(0.02		)
Equity earnings of unconsolidated subsidiaries	(0.02		)
Other, net	0.02
GAAP diluted EPS — 2017	$	2.25
Impact of the TCJA	0.05
Ongoing diluted EPS — 2017	$	2.30

^(a)  Includes an increase of $23 million in revenues from conservation and DSM programs, offset by related expenses, for the twelve months ended Dec. 31, 2017.

^(b)  ETR includes the impact of an additional $20 million of wind PTCs for the twelve months ended Dec. 31, 2017, which are largely flowed back to customers through electric margin, as well as the impact of the TCJA recorded in the fourth quarter of 2017.

^(c)  Offset by higher revenues.

29

ROE for Xcel Energy and its utility subsidiaries at Dec. 31:

	2018		2017
ROE	GAAP and Ongoing ROE		GAAP ROE		Impact of the TCJA		Ongoing ROE
PSCo	9.10	%	8.90	%	(0.24	)%	8.66	%
NSP-Minnesota	8.91		9.05		0.45		9.50
SPS	9.14		7.84		(0.30	)	7.54
NSP-Wisconsin	10.77		9.41		0.09		9.50
Operating Companies	9.14		8.84		0.03		8.87
Xcel Energy	10.65		10.21		0.21		10.42

Reconciliation of GAAP earnings (net income) to ongoing earnings and GAAP diluted EPS to ongoing diluted EPS for the years ended Dec. 31:

(Millions of Dollars)	2018		2017		2016
GAAP earnings	$	1,261	$	1,148	$	1,123
Estimated impact of TCJA	—		23		—
Ongoing earnings	$	1,261	$	1,171	$	1,123

Diluted EPS	2018		2017		2016
GAAP diluted EPS	$	2.47	$	2.25	$	2.21
Estimated impact of TCJA	—		0.05		—
Ongoing diluted EPS	$	2.47	$	2.30	$	2.21

Statement of Income Analysis

The following summarizes the items that affected the individual revenue and expense items reported in the consolidated statements of income.

Estimated Impact of Temperature Changes on Earnings — Unusually hot summers or cold winters increase electric and natural gas sales, while mild weather reduces electric and natural gas sales. The estimated impact of weather on earnings is based on the number of customers, temperature variances and the amount of natural gas or electricity historically used per degree of temperature. Weather deviations from normal levels can affect Xcel Energy’s financial performance.

Degree-day or THI data is used to estimate amounts of energy required to maintain comfortable indoor temperature levels based on each day’s average temperature and humidity. HDD is the measure of the variation in the weather based on the extent to which the average daily temperature falls below 65° Fahrenheit. CDD is the measure of the variation in the weather based on the extent to which the average daily temperature rises above 65° Fahrenheit. Each degree of temperature above 65° Fahrenheit is counted as one CDD, and each degree of temperature below 65° Fahrenheit is counted as one HDD. In Xcel Energy’s more humid service territories, a THI is used in place of CDD, which adds a humidity factor to CDD. HDD, CDD and THI are most likely to impact the usage of Xcel Energy’s residential and commercial customers. Industrial customers are less sensitive to weather.

Normal weather conditions are defined as either the 20-year or 30-year average of actual historical weather conditions. The historical period of time used in the calculation of normal weather differs by jurisdiction, based on regulatory practice. To calculate the impact of weather on demand, a demand factor is applied to the weather impact on sales. Extreme weather variations, windchill and cloud cover may not be reflected in weather-normalized estimates. Percentage increase (decrease) in normal and actual HDD, CDD and THI:

	2018 vs. Normal		2017 vs. Normal		2018 vs. 2017		2016 vs. Normal		2017 vs. 2016
HDD	2.2	%	(10.0	)%	12.2	%	(13.4	)%	2.6	%
CDD	26.7		6.5		20.5		11.1		(3.5	)
THI	37.3		(11.3	)	56.9		7.7		(18.5	)

Weather — Estimated impact of temperature variations on EPS compared with normal weather conditions:

	2018 vs. Normal			2017 vs. Normal			2018 vs. 2017			2016 vs. Normal			2017 vs. 2016
Retail electric	$	0.114		$	(0.036	)	$	0.150		$	0.004		$	(0.040	)
Firm natural gas	0.007			(0.023		)	0.030			(0.025		)	0.002
Total (excluding decoupling)	$	0.121		$	(0.059	)	$	0.180		$	(0.021	)	$	(0.038	)
Decoupling — Minnesota electric	(0.051		)	0.022			(0.073		)	(0.002		)	0.024
Total (adjusted for recovery from decoupling)	$	0.070		$	(0.037	)	$	0.107		$	(0.023	)	$	(0.014	)

Sales Growth(Decline) — Sales growth (decline) for actual and weather-normalized sales in 2018 compared to the same period in 2017:

	2018 vs. 2017
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Actual
Electric residential	3.6	%	5.8	%	8.6	%	5.7	%	5.4	%
Electric C&I	1.5		1.1		5.4		3.2		2.4
Total retail electric sales	2.2		2.5		5.9		3.9		3.2
Firm natural gas sales	9.3		14.6		N/A		13.1		11.3

30

	2018 vs. 2017
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Weather-normalized
Electric residential	1.8	%	(0.5	)%	2.0	%	0.2	%	0.8	%
Electric C&I	1.2		(0.4	)	4.6		2.3		1.5
Total retail electric sales	1.3		(0.4	)	4.1		1.7		1.3
Firm natural gas sales	2.2		2.7		N/A		3.1		2.4

Weather-normalized 2018 Electric Sales Growth (Decline)

• PSCo — Higher residential sales growth reflects customer additions and slightly higher use per customer. C&I growth was due to an increase in customers and higher use per customer, predominately from the fabricated metal, food products, metal mining and oil and gas extraction industries.

• NSP-Minnesota — Residential sales decrease was a result of lower use per customer, partially offset by customer growth. The decline in C&I sales was due to an increase in customers offset by lower use per customer. Increased sales to large customers in manufacturing and energy were offset by declines in services.

• SPS — Residential sales grew largely due to higher use per customer and customer additions. The increase in C&I sales was driven by the oil and natural gas industry in the Permian Basin.

• NSP-Wisconsin — Sales growth was primarily attributable to customer additions, partially offset by lower use per customer. C&I growth was largely due to higher use per large customer, customer additions and increased sales to sand mining and energy industries.

Weather-normalized 2018 Natural Gas Sales Growth

• Higher natural gas sales reflect an increase in the number of customers combined with increasing customer use.

	2017 vs. 2016
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Actual
Electric residential	(1.8	)%	(2.1	)%	(3.5	)%	(0.8	)%	(2.1	)%
Electric C&I	(0.1	)	(1.4	)	1.3		2.2		(0.1	)
Total retail electric sales	(0.6	)	(1.6	)	0.2		1.3		(0.7	)
Firm natural gas sales	(2.2	)	9.3		N/A		11.3		2.1

	2017 vs. 2016
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Weather-normalized
Electric residential	(1.6	)%	(0.7	)%	(1.2	)%	0.3	%	(1.0	)%
Electric C&I	0.1		(1.0	)	1.5		2.5		0.2
Total retail electric sales	(0.4	)	(1.0	)	0.9		1.8		(0.2	)
Firm natural gas sales	0.6		4.7		N/A		5.7		2.2

	2017 vs. 2016 (Excluding Leap Day) (b)
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Weather-normalized - adjusted for leap day
Electric residential (a)	(1.3	)%	(0.5	)%	(1.0	)%	0.6	%	(0.8	)%
Electric C&I	0.3		(0.8	)	1.8		2.7		0.4
Total retail electric sales	(0.2	)	(0.7	)	1.1		2.1		0.1
Firm natural gas sales	1.1		5.2		N/A		6.3		2.7

^(a)  Extreme weather variations, windchill and cloud cover may not be reflected in weather-normalized and actual growth (decline) estimates.

^(b)  Estimated impact of the 2016 leap day is excluded to present a more comparable year-over-year presentation. Estimated impact of the additional day of sales in 2016 was approximately 0.3% for retail electric and 0.5% for firm natural gas for the twelve months ended.

Weather-normalized 2017 Electric Sales Growth (Decline) (Excluding Leap Day)

• PSCo’s decline in residential sales reflects lower use per customer, partially offset by customer additions. C&I growth was mainly due to an increase in customers and higher use for large C&I customers that support the mining, oil and natural gas industries, partially offset by lower use for the small C&I class.

• NSP-Minnesota’s residential sales decrease was a result of lower use per customer, partially offset by customer growth. The decline in C&I sales was largely due to reduced usage, which offset an increase in the number of customers. Declines in services more than offset increased sales to large customers in manufacturing and energy industries.

• SPS’ residential sales fell largely due to lower use per customer. The increase in C&I sales reflects customer additions and greater use for large C&I customers driven by the oil and natural gas industry in the Permian Basin.

• NSP-Wisconsin’s residential sales increase was primarily attributable to higher use per customer and customer additions. C&I growth was largely due to higher use per customer and increased sales to customers in the sand mining industry and large customers in the energy and manufacturing industries.

Weather-normalized 2017 Natural Gas Sales Growth

• Higher natural gas sales reflect an increase in the number of customers, partially offset by a decline in customer use.

Weather-normalized sales for 2019 are projected to be relatively consistent with 2018 levels for retail electric customers and within a range of 0.0% to 1.0% over 2018 levels for retail natural gas customers.

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Electric Margin

Electric revenues and fuel and purchased power expenses are impacted by fluctuations in the price of natural gas, coal and uranium used in the generation of electricity. However, these price fluctuations have minimal impact on electric margin due to fuel recovery mechanisms that recover fuel expenses. Electric margin was reduced by approximately $105 million in 2018 and $130 million in 2017 for PTCs (grossed up for federal income tax) which were returned to customers. Margin reductions for PTCs are largely offset by income tax benefits.

Electric revenues and margin before and after the impact of the TCJA:

(Millions of Dollars)	2018			2017			2016
Electric revenues before TCJA impact	$	10,046		$	9,676		$	9,500
Electric fuel and purchased power before TCJA impact	(3,867		)	(3,757		)	(3,718		)
Electric margin before TCJA impact	$	6,179		$	5,919		$	5,782
TCJA impact (offset as a reduction in income tax)	(314		)	—			—
Electric margin	$	5,865		$	5,919		$	5,782

Electric Margin

(Millions of Dollars)	2018 vs. 2017
Estimated impact of weather (net of Minnesota decoupling)	$	63
Retail sales growth (net of Minnesota decoupling and sales true-up)	52
Non-fuel riders	45
Purchased capacity costs	38
Wholesale transmission revenue (net)	31
Retail rate increase (Wisconsin, New Mexico and Michigan)	20
Other (net)	11
Total increase in electric margin before TCJA impact	$	260
TCJA impact (offset as a reduction in income tax)	(314		)
Total decrease in electric margin	$	(54	)

(Millions of Dollars)	2017 vs. 2016
Retail rate increases (Texas, Minnesota, New Mexico and Wisconsin)	$	123
Non-fuel riders	33
Conservation and DSM revenues (offset by expenses)	23
Decoupling (weather portion — Minnesota)	18
Purchased capacity costs	8
Wholesale transmission revenue (net of costs)	(38		)
Estimated impact of weather	(30		)
Conservation incentive	(18		)
Other (net)	18
Total increase in electric margin	$	137

Natural Gas Margin

Total natural gas expense varies with changing sales requirements and the cost of natural gas. However, fluctuations in the cost of natural gas has minimal impact on natural gas margin due to natural gas cost recovery mechanisms.

Natural gas revenues and margin before and after the impact of the TCJA:

(Millions of Dollars)	2018			2017			2016
Natural gas revenues before TCJA impact	$	1,778		$	1,650		$	1,531
Cost of natural gas sold and transported	(843		)	(823		)	(733		)
Natural gas margin before TCJA impact	$	935		$	827		$	798
TCJA impact (offset as a reduction in income tax)	(39		)	—			—
Natural gas margin	$	896		$	827		$	798

Natural Gas Margin

(Millions of Dollars)	2018 vs. 2017
Retail rate increase (Colorado, Wisconsin and Michigan)	$	58
Estimated impact of weather	24
Infrastructure and integrity riders	13
Sales growth	6
Conservation revenue (offset by expenses)	3
Other (net)	4
Total increase in natural gas margin before TCJA impact	$	108
TCJA impact (offset as a reduction in income tax)	(39		)
Total increase in natural gas margin	$	69

(Millions of Dollars)	2017 vs. 2016
Infrastructure and integrity riders	$	18
Retail sales growth, excluding weather impact	7
Estimated impact of weather	1
Other (net)	3
Total increase in natural gas margin	$	29

Non-Fuel Operating Expenses and Other Items

O&M Expenses — O&M expenses increased$82 million, or 3.6%, for 2018. Significant changes are summarized below:

(Millions of Dollars)	2018 vs. 2017
Business systems and contract labor	$	39
Distribution costs	19
Natural gas systems damage prevention and other remediation	12
Generation plant costs (including increased wind O&M)	11
Nuclear plant operations and amortization	(9		)
Other (net)	10
Total increase in O&M expenses	$	82

• Business systems and contract labor costs increased due to growing network and storage needs, cybersecurity, initiatives to support our customer strategy, and initiatives to improve business processes;

• Distribution costs reflect higher maintenance expenses, including vegetation management; and,

• Nuclear plant operations and amortization are lower largely reflecting savings initiatives and reduced refueling outage costs.

32

O&M expenses decreased $23 million, or 1.0%, for 2017. Significant changes are summarized as follows:

(Millions of Dollars)	2017 vs. 2016
Nuclear plant operations and amortization	$	(27	)
Plant generation costs	(23		)
Transmission costs	(2		)
Employee benefits expense	17
Texas 2016 electric rate case cost deferral	16
Electric distribution costs	2
Other (net)	(6		)
Total decrease in O&M expenses	$	(23	)

• Nuclear plant operations and amortization expenses are lower mostly due to reduced refueling outage costs and operating efficiencies.

• Plant generation costs decreased as a result of lower expenses associated with planned outages and overhauls at a number of generation facilities.

• Employee benefits expense includes the recognition of an $8 million pension settlement expense in the fourth quarter of 2017.

Conservation and DSM Program Expenses —Conservation and DSM program expenses increased$17 million, or 6.2%, for 2018. The increase was primarily due to recovery for conservation programs to assist customers in reducing energy use. Conservation and DSM expenses are generally recovered concurrently through riders and base rates. Timing of recovery may vary from when costs are incurred.

Conservation and DSM program expenses increased $28 million, or 11.4%, for 2017 compared with 2016. The increase was due to higher customer participation in electric conservation programs and recovery rates, mostly in Minnesota.

Depreciation and Amortization — Depreciation and amortization increased$163 million, or 11%, for 2018. The increase was primarily driven by capital investments and additional amortization of a prepaid pension asset in Colorado (approximately $75 million) related to TCJA settlements, which were offset by lower income taxes.

Depreciation and amortization increased $176 million, or 13.5%, for 2017 compared with 2016. The increase was primarily due to capital investments and prior year amortization of the excess depreciation reserve in Minnesota.

Taxes (Other Than Income Taxes) — Taxes (other than income taxes) increased$11 million, or 2.0%, for 2018. The increase was primarily due to higher property taxes.

Taxes (other than income taxes) increased $13 million, or 2.4%, for 2017 compared with 2016. The increase was primarily due to higher property taxes in Minnesota and Texas.

AFUDC, Equity and Debt — AFUDC increased$46 million for 2018. The increase was primarily due to the Rush Creek and Hale wind projects and other capital investments.

AFUDC increased $23 million for 2017 compared with 2016. The increase was primarily due to higher CWIP, particularly the Rush Creek wind project.

Interest Charges — Interest expense increased$37 million, or 5.6%, for 2018. The increase was related to higher debt levels to fund capital investments, partially offset by refinancings at lower interest rates.

Interest charges increased $16 million, or 2.5%, for 2017 compared with 2016. The increase was related to higher debt levels to fund capital investments, partially offset by refinancings at lower interest rates.

Income Taxes — Income tax expense decreased $361 million for 2018. The decrease was primarily driven by a lower federal tax rate due to the TCJA, lower pretax earnings, a one time, non-cash income tax expense related to the TCJA in 2017, an increase in plant-related regulatory differences related to ARAM (net of deferrals), 2018 non-plant excess accumulated deferred income tax amortization, and the impact of 2018 investment tax credits. These were partially offset by a higher tax benefit for the resolution of past appeals/audits in 2017 and a higher tax benefit for adjustments in 2017. The ETR was 12.6% for 2018 compared with 32.1% for 2017. The lower ETR in 2018 was largely due to the adjustments above.

Income tax expense decreased $39 million for 2017 compared with 2016. The decrease was primarily driven by increased wind PTCs, a net tax benefit related to the resolution of appeals/audits in 2017, an increase in R&E credits, lower pretax earnings in 2017 and a rise in permanent plant-related adjustments. PTCs are flowed back to customers and reduce electric margin. The decrease was partially offset by the estimated one-time, non-cash, income tax expense recognized in the fourth quarter related to the TCJA. The ETR was 32.1% for 2017 compared with 34.1% for 2016. The lower ETR in 2017 was primarily due to the adjustments referenced above. Excluding the impact for the TCJA adjustment, the ETR would have been 30.7% for 2017.

See Note 7 to the consolidated financial statements for further information.

Xcel Energy Inc. and Other Results

Net income and diluted EPS contributions of Xcel Energy Inc. and its nonregulated businesses:

	Contribution (Millions of Dollars)
	2018			2017			2016
Xcel Energy Inc. financing costs	$	(110	)	$	(79	)	$	(71	)
Eloigne (a)	—			2			1
Xcel Energy Inc. taxes and other results	(5		)	(35		)	(6		)
Total Xcel Energy Inc. and other costs	$	(115	)	$	(112	)	$	(76	)

	Contribution (Diluted Earnings (Loss) Per Share)
	2018			2017			2016
Xcel Energy Inc. financing costs	$	(0.21	)	$	(0.15	)	$	(0.14	)
Eloigne (a)	—			—			—
Xcel Energy Inc. taxes and other results	(0.01		)	(0.07		)	(0.01		)
Total Xcel Energy Inc. and other costs	$	(0.22	)	$	(0.22	)	$	(0.15	)

^(a)  Amounts include gains or losses associated with sales of properties held by Eloigne.

Xcel Energy Inc.’s results include interest charges, which are incurred at Xcel Energy Inc. and are not directly assigned to individual subsidiaries.

Factors Affecting Results of Operations

Xcel Energy’s utility revenues depend on customer usage, which varies with weather conditions, general business conditions and the cost of energy services. Various regulatory agencies approve the prices for electric and natural gas service within their respective jurisdictions and affect Xcel Energy’s ability to recover its costs from customers. Historical and future trends of Xcel Energy’s operating results have been, and are expected to be, affected by a number of factors, including those listed below.

33

Regulation

FERC and State Regulation— The FERC and various state and local regulatory commissions regulate Xcel Energy Inc.’s utility subsidiaries and WGI. The electric and natural gas rates charged to customers of Xcel Energy Inc.’s utility subsidiaries and WGI are approved by the FERC or the regulatory commissions in the states in which they operate. The rates are designed to recover plant investment, operating costs and an allowed return on investment. Xcel Energy Inc.’s utility subsidiaries request changes in rates for utility services through filings with governing commissions. Changes in operating costs can affect Xcel Energy’s financial results, depending on the timing of rate case filings and implementation of final rates. Other factors affecting rate filings are new investments, sales, conservation and DSM efforts, and the cost of capital. In addition, the regulatory commissions authorize the ROE, capital structure and depreciation rates in rate proceedings. Decisions by these regulators can significantly impact Xcel Energy’s results of operations.

Tax Reform — Regulatory Proceedings

In December 2017, the TCJA was signed into law, enacting significant changes to the IRC, including a reduction of the corporate income tax rate from 35% to 21% and a resulting reduction in deferred tax assets and liabilities. As a result of IRS requirements and past regulatory treatment of income taxes in the determination of regulated rates, the impacts of TCJA are primarily recognized as a regulatory liability. Treatment of these tax benefits, (e.g., degree to which benefits will be used to refund currently effective rates and/or used to mitigate other costs and potential future rate increases) is subject to regulatory approval.

Concluded and ongoing regulatory TCJA proceedings:

Operating Company	Utility Service	Approval Date	Additional Information
NSP-Minnesota	Electric and Natural Gas	August 2018	Minnesota — In 2018, the MPUC ordered NSP-Minnesota to refund the 2018 impacts of TCJA, including $135 million to electric customers and low income program funding, and $6 million to natural gas customers.
NSP-Minnesota	Electric	July 2018	South Dakota — In July 2018, the SDPUC approved a settlement providing a one-time customer refund of $11 million for the 2018 impact of the TCJA, while NSP-Minnesota would retain the TCJA benefits in 2019 and 2020 in exchange for a two-year rate case moratorium.
NSP-Minnesota	Natural Gas	November 2018	North Dakota — In November 2018, the NDPSC approved a TCJA settlement in which NSP-Minnesota will amortize $1 million annually of the regulatory asset for the remediation of the MGP site in Fargo, ND and retain the TCJA savings to offset the MGP amortization expense.
NSP-Minnesota	Electric	February 2019	North Dakota — In February 2019, the NDPSC approved a settlement including a one-time customer refund of $10 million for 2018, while NSP-Minnesota would retain the TCJA benefits in 2019 and 2020 in exchange for a two-year rate case moratorium.
NSP-Wisconsin	Electric and Natural Gas	May 2018	Wisconsin — In May 2018, the PSCW approved customer refunds of $27 million and deferrals of approximately $5 million until NSP-Wisconsin’s next rate case proceeding.
NSP-Wisconsin	Electric and Natural Gas	May 2018	Michigan — In May 2018, the MPSC approved electric and natural gas TCJA settlement agreements. Most of the electric TCJA benefits were reflected in NSP-Wisconsin’s approved Michigan 2018 electric base rate case.
PSCo	Natural Gas	December 2018	In February 2018, the ALJ recommended approval of a TCJA settlement agreement, which included a $20 million reduction to PSCo’s provisional rates effective March 1, 2018. In September 2018, PSCo revised its 2018 TCJA benefit estimate to $24 million and requested an equity ratio of 56% to offset the negative impact of the TCJA on credit metrics. In December 2018, the CPUC approved an equity ratio of 54.6% and utilized the remainder of the TCJA benefit to reduce an existing prepaid pension asset. The CPUC also ordered 2018 excess non-plant ADIT benefits of $11.1 million be utilized to accelerate amortization of the prepaid pension asset.
PSCo	Electric	June 2018 October 2018	In 2018, the CPUC approved a TCJA settlement agreement that included a customer refund of $42 million in 2018, with the remainder of the $59 million of TCJA benefits to be used to accelerate the amortization of an existing prepaid pension asset. For 2019, the expected customer refund is estimated to be $67 million, and amortization of the prepaid pension asset is estimated to be $34 million. Impacts of the TCJA for 2020 and future years are expected to be addressed in a future electric rate case.
SPS	Electric	December 2018	Texas - In December 2018, the PUCT approved a rate settlement which fully reflects the TCJA cost impacts and results in no change in customer rates or refunds and SPS’ actual capital structure, which SPS has informed the parties it intends to be up to a 57% equity ratio to offset the negative impacts on its credit metrics and potentially its credit ratings.
SPS	Electric	Pending	New Mexico- In September 2018, the NMPRC issued its final order in SPS’ 2017 electric rate case, which included a $10 million refund of the 2018 impact of the TCJA. SPS subsequently filed an appeal with the NMSC, including the order to refund retroactive TCJA savings. The NMSC granted a temporary stay to delay the implementation of the retroactive TCJA refund until a decision on the appeal occurs. On Feb. 15, 2019, SPS and the NMPRC filed a Joint Motion to Dismiss with the NMSC, requesting they remand the case back to the NMPRC to provide them the opportunity to revise its rate case order in accordance with the motion. This would require the NMPRC to replace the order issued in September 2018 and eliminate the retroactive TCJA refund. The revised order would be subject to further administrative or judicial review.

See Note 7 to the consolidated financial statements for further information.

34

Pending and Recently Concluded Regulatory Proceedings

Mechanism	Utility Service	Amount Requested (in millions)	Filing Date	Approval	Additional Information
NSP-Minnesota (MPUC)
TCR	Electric	$98	November 2017	Pending	Reflects the revenue requirements for 2018 and a true-up for 2017 and is based on a proposed ROE of 10%. The MPUC decision is expected during the first quarter of 2019.
CIP Incentive	Electric & Natural Gas	$34	March 2018	Received	The MPUC approved 2017 CIP electric and natural gas financial incentives, effective October 2018, of $30 million and $4 million, respectively.
CIP Rider	Electric & Natural Gas	$57	March 2018	Received	The MPUC approved the forecasted 2018 electric and natural gas CIP riders with estimated 2019 recovery of $48 million and $9 million of electric and natural gas CIP expenses, respectively.
2018 GUIC	Natural Gas	$23	November 2017	Pending	Proposed ROE of 10%. The MPUC decision is expected during the first quarter of 2019.
2019 GUIC	Natural Gas	$29	November 2018	Pending	Proposed ROE of 10.25%. Timing of the MPUC decision is uncertain.
RDF	Electric	$42	October 2018	Received	The MPUC approved the 2019 RDF rate based on a net revenue requirement of $42 million, effective January 2019.
RES	Electric	$23	November 2017	Pending	Reflects the revenue requirements for 2018, 2017 true-up and a proposed ROE of 10%. The MPUC decision is expected in the first quarter of 2019.
PSCo (CPUC)
Multi-Year Rate Case	Natural Gas	$139	June 2017	Received	Proposed annual revenue request of $139 million over three years, $63 million for 2018. Requested an ROE of 10.0% and an equity ratio of 55.25%. In August 2018, CPUC approved an increase of $46 million (prior to TCJA impacts). The interim decision included application of a 2016 HTY, a 13-month average rate base, an ROE of 9.35%, an equity ratio of 54.6% and provided no return on the prepaid pension asset. In December 2018, the CPUC issued the final ruling which upheld the interim decision and finalized the TCJA impacts. In October 2018, the CPUC approved a settlement to extend the PSIA rider through 2021.
DSM Incentive	Electric & Natural Gas	$11	April 2018	Received	PSCo earned an electric and natural gas DSM incentive of $9 million and $2 million, respectively, for achieving its 2017 savings goals.
SPS (PUCT)
Rate Case	Electric	$54	August 2017	Received	In 2017, SPS filed a retail electric, non-fuel base rate increase case in Texas, which included an ROE of 9.5%. In December 2018, PUCT issued a final order approving a settlement, which results in no overall change to SPS’ revenues after adjusting for the impact of the TCJA and the lower costs of long-term debt. In November 2018, SPS filed an application with the PUCT requesting permission to recover $5.4 million in unbilled TCRF revenue from January 23, 2018 through June 9, 2018. Timing of a final order on this matter is uncertain.
SPS (NMPRC)
Rate Case	Electric	$41	November 2016	Pending	In 2017, SPS filed a notice of appeal to the New Mexico Supreme Court. A decision is not expected until the second half of 2019.
Rate Case	Electric	$43	October 2017	Received/Pending	In September 2018, the NMPRC approved a revenue increase of approximately $8 million, effective Sept. 27, 2018, based on a ROE of 9.1% and a 51% equity ratio. The NMPRC also ordered a refund of $10 million associated with the TCJA impacts (retroactive Jan. 1, 2018 - Sept. 27, 2018). SPS recorded a regulatory liability for this amount in the third quarter of 2018. SPS subsequently filed an appeal of the order. The NMSC subsequently granted a temporary stay to delay the implementation of the retroactive TCJA refund until a decision on the appeal occurs. On Feb. 15, 2019, SPS and the NMPRC filed a Joint Motion to Dismiss with the NMSC, requesting they remand the case back to the NMPRC to provide them the opportunity to revise its rate case order in accordance with the motion. This would require the NMPRC to replace the order issued in September 2018 with the following: eliminating the retroactive refund associated with the TCJA, approving a ROE of 9.56% and approving an equity ratio of 53.97%. Annual revenue increase based on terms of the settlement agreement would be $12.5 million ($8 million from original order plus $4.5 million for changes in ROE and equity ratio). New rates would be effective as of the date provided by the revised NMPRC order (not retrospective to Sept. 26, 2018), which is expected in the second quarter of 2019. The revised order would be subject to further administrative or judicial review.

See Rate Matters within Note 12 to the consolidated financial statements for further information.

NSP-Minnesota — Mankato Energy Center Acquisition — In November 2018, NSP-Minnesota reached an agreement with Southern Power Company to purchase the 760 MW natural gas combined cycle Mankato Energy Center for approximately $650 million. NSP-Minnesota previously contracted to purchase the energy and capacity of this facility through a PPA. The asset acquisition is anticipated to close in mid-2019 and subject to regulatory approvals from the MPUC, NDPSC, FERC and DOJ. The acquisition is projected to provide net customer savings of approximately $50 million to $150 million over the life of the plant.

NSP-Minnesota — Wind Repowering Acquisition — In December 2018, NSP-Minnesota filed with the MPUC to acquire the Jeffers and Community Wind North wind farms from Longroad Energy. The wind farms will have approximately 70 MW of capacity after being repowered. The repowering is expected to be completed by December 2020 to qualify for the 100% PTC benefit. The acquisition is projected to provide customer savings of approximately $7 million over the life of the wind farms. Cost of acquisition is approximately $135 million and pending MPUC approval.

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General Economic Conditions

Economic conditions may have a material impact on Xcel Energy’s operating results. Other events impact overall economic conditions and management cannot predict the impact of fluctuating energy prices, terrorist activity, war or the threat of war. However, Xcel Energy could experience a material impact to its results of operations, future growth or ability to raise capital resulting from a sustained general slowdown in economic growth or a significant increase in interest rates.

Fuel Supply and Costs

See Item 1 — Fuel Supply and Costs for discussion of fuel supply and costs.

Pension Plan Costs and Assumptions

Xcel Energy has significant net pension and postretirement benefit costs that are measured using actuarial valuations. Key assumptions in these valuations include discount rates and expected return on plan assets. Xcel Energy evaluates these key assumptions at least annually by analyzing current market conditions, which include changes in interest rates and market returns. Changes in the related net pension and postretirement benefits costs and funding requirements may occur in the future due to changes in assumptions. The payout of a significant percentage of pension plan liabilities in a single year due to high retirements or employees leaving Xcel Energy would trigger settlement accounting and could require Xcel Energy to recognize material incremental pension expense related to unrecognized plan losses in the year these liabilities are paid. For further discussion and a sensitivity analysis on these assumptions, see “Employee Benefits” under Critical Accounting Policies and Estimates.

Environmental Matters

Environmental costs include accruals for nuclear plant decommissioning and payments for storage of spent nuclear fuel, disposal of hazardous materials and waste, remediation of contaminated sites, monitoring of discharges to the environment and compliance with laws and permits with respect to emissions.

Costs charged to operating expenses for nuclear decommissioning and spent nuclear fuel disposal expenses, environmental monitoring and disposal of hazardous materials and waste were approximately:

• $309 million in 2018;

• $303 million in 2017; and,

• $304 million in 2016.

Xcel Energy estimates an average annual expense of approximately $356 million from 2019 - 2023 for similar costs. The precise timing and amount of environmental costs, including those for site remediation and disposal of hazardous materials, are unknown. Additionally, the extent to which environmental costs will be included in and recovered through rates may fluctuate.

Capital expenditures for environmental improvements at regulated facilities were approximately:

• $50 million in 2018;

• $61 million in 2017; and,

• $93 million in 2016.

See Item 7 — Capital Requirements for further discussion.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Preparation of the consolidated financial statements and disclosures in compliance with GAAP requires the application of accounting rules and guidance, as well as the use of estimates. Application of these policies involves judgments regarding future events, including the likelihood of success of particular projects, legal and regulatory challenges and anticipated recovery of costs. These judgments could materially impact the consolidated financial statements and disclosures, based on varying assumptions. In addition, the financial and operating environment also may have a significant effect on the operation of the business and results reported.

Accounting policies and estimates that are most significant to Xcel Energy’s results of operations, financial condition or cash flows, and require management’s most difficult, subjective or complex judgments are outlined below. Each of these has a higher likelihood of resulting in materially different reported amounts under different conditions or using different assumptions. Each critical accounting policy has been reviewed and discussed with the Audit Committee of Xcel Energy Inc.’s Board of Directors on a quarterly basis.

Regulatory Accounting

Xcel Energy Inc. is subject to the accounting for Regulated Operations, which provides that rate-regulated entities report assets and liabilities consistent with the recovery of those incurred costs in rates, if it is probable that such rates will be charged and collected. Xcel Energy’s rates are derived through the ratemaking process, which results in the recording of regulatory assets and liabilities based on the probability of future cash flows. Regulatory assets generally represent incurred or accrued costs that have been deferred because future recovery from customers is probable. Regulatory liabilities generally represent amounts that are expected to be refunded to customers in future rates or amounts collected in current rates for future costs. In other businesses or industries, regulatory assets and regulatory liabilities would generally be charged to net income or other comprehensive income.

Each reporting period Xcel Energy assesses the probability of future recoveries and obligations associated with regulatory assets and liabilities. Factors such as the current regulatory environment, recently issued rate orders and historical precedents are considered. Decisions made by regulatory agencies can directly impact the amount and timing of cost recovery as well as the rate of return on invested capital, and may materially impact Xcel Energy’s results of operations, financial condition or cash flows.

As of Dec. 31, 2018 and 2017, Xcel Energy has recorded regulatory assets of $3.8 billion and $3.4 billion, respectively, and regulatory liabilities of $5.6 billion and $5.3 billion, respectively. Each subsidiary is subject to regulation that varies from jurisdiction to jurisdiction. If future recovery of costs in any such jurisdiction is no longer probable, Xcel Energy would be required to charge these assets to current net income or other comprehensive income. In assessing the probability of recovery of recognized regulatory assets, Xcel Energy noted no current or anticipated proposals or changes in the regulatory environment that it expects will materially impact the probability of recovery of the assets.

See Note 4 to the consolidated financial statements for further information.

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Income Tax Accruals

Judgment, uncertainty and estimates are a significant aspect of the income tax accrual process that accounts for the effects of current and deferred income taxes. Uncertainty associated with the application of tax statutes and regulations and outcomes of tax audits and appeals require that judgment and estimates be made in the accrual process and in the calculation of the ETR.

Changes in tax laws and rates may affect recorded deferred tax assets and liabilities and our future ETR. ETR calculations are revised every quarter based on best available year-end tax assumptions, adjusted in the following year after returns are filed. The tax accrual estimates being trued-up to the actual amounts claimed on the tax returns and further adjusted after examinations by taxing authorities, as needed.

In accordance with the interim period reporting guidance, income tax expense for the first three quarters in a year is based on the forecasted annual ETR. The forecasted ETR reflects a number of estimates including forecasted annual income, permanent tax adjustments and tax credits.

Valuation allowances are applied to deferred tax assets if it is more likely than not that at least a portion may not be realized based on an evaluation of expected future taxable income. Accounting for income taxes also requires that only tax benefits that meet the more likely than not recognition threshold can be recognized or continue to be recognized. We may adjust our unrecognized tax benefits and interest accruals as disputes with the IRS and state tax authorities are resolved, and as new developments occur. These adjustments may increase or decrease earnings.

See Note 7 to the consolidated financial statements for further information.

Employee Benefits

Xcel Energy sponsors several noncontributory, defined benefit pension plans and other postretirement benefit plans that cover almost all employees and certain retirees. Projected benefit costs are based on historical information and actuarial calculations that include a number of key assumptions (e.g., annual return level on pension and postretirement health care investment assets, discount rates, mortality rates and health care cost trend rates). In addition, the pension cost calculation uses an asset-smoothing methodology to reduce the volatility of investment performance over time. Pension assumptions are continually reviewed by Xcel Energy..

At Dec. 31, 2018, Xcel Energy set the rate of return on assets used to measure pension costs at 6.87%, which is consistent with the rate set at Dec. 31, 2017. The rate of return used to measure postretirement health care costs is 5.30% at Dec. 31, 2018, which represents a 50 basis point decrease from Dec. 31, 2017. Xcel Energy’s pension investment strategy is based on plan-specific investments that seek to minimize investment and interest rate risk as a plan’s funded status increases over time. This strategy results in a greater percentage of interest rate sensitive securities being allocated to plans having relatively higher funded status ratios and a greater percentage of growth assets being allocated to plans having relatively lower funded status ratios.

Xcel Energy set the discount rates used to value the pension obligations at 4.31% and postretirement health care obligations at 4.32% at Dec. 31, 2018. This represents a 68 basis point and 70 basis point increase, respectively, from Dec. 31, 2017. Xcel Energy uses a bond matching study as its primary basis for determining the discount rate used to value pension and postretirement health care obligations. The bond matching study utilizes a portfolio of high grade (Aa or higher) bonds that matches the expected cash flows of Xcel Energy’s benefit plans in amount and duration.

The effective yield on this cash flow matched bond portfolio determines the discount rate for the individual plans. The bond matching study is validated for reasonableness against the Merrill Lynch Corporate 15+ Bond Index. In addition, Xcel Energy reviews general actuarial survey data to assess the reasonableness of the discount rate selected.

If Xcel Energy were to use alternative assumptions at Dec. 31, 2018, a 1% change would result in the following impact on 2018 pension costs:

	Pension Costs
(Millions of Dollars)	+1%			-1%
Rate of return	$	(17	)	$	17
Discount rate (a)	(6		)	7

^(a)  These costs include the effects of regulation.

Mortality rates are developed from actual and projected plan experience for pension plan and postretirement benefits. Xcel Energy’s actuary conducts an experience study periodically as part of the process to determine an estimate of mortality. Xcel Energy considers standard mortality tables, improvement factors and the plans actual experience when selecting a best estimate.

As of Dec. 31, 2018 the initial medical trend cost claim assumptions for Pre-65 was 6.5% and Post-65 was 5.3%. The ultimate trend assumption remained at 4.5% for both Pre-65 and Post-65 claims costs. The period from initial trend rate until the ultimate rate is reached is four years. Xcel Energy bases its medical trend assumption on the long-term cost inflation expected in the health care market, considering the levels projected and recommended by industry experts, as well as recent actual medical cost experienced by Xcel Energy’s retiree medical plan.

A 1% change in the assumed health care cost trend rate would have the following effects on Xcel Energy:

	APBO					Service and Interest Components
(Millions of Dollars)	+1%		-1%			+1%		-1%
Health care cost trend	$	49	$	(42	)	$	3	$	(2	)

Funding requirements in 2019 are expected to remain consistent with 2018, continue at that level in 2020 and begin to decline in the following years. While investment returns were below the assumed levels in 2016 and exceeded assumed levels in 2017, investment returns were below the assumed levels in 2018.

The pension cost calculation uses a market-related valuation of pension assets. Xcel Energy uses a calculated value method to determine the market-related value of the plan assets. The market-related value is determined by adjusting the fair market value of assets at the beginning of the year to reflect the investment gains and losses (the difference between the actual investment return and the expected investment return on the market-related value) during each of the previous five years at the rate of 20% per year. As differences between actual and expected investment returns are incorporated into the market-related value, amounts are recognized in pension cost over the expected average remaining years of service for active employees (approximately 13 years in 2018).

Xcel Energy currently projects the pension costs recognized for financial reporting purposes will be $114 million in 2019 and $107 million in 2020, while the actual pension costs were $140 million in 2018 and $139 million in 2017. The expected decrease in 2019 and future year costs is primarily due the settlement charge experienced in 2018 and reductions in loss amortizations.

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Pension funding contributions across all four of Xcel Energy’s pension plans, both voluntary and required, for 2016 - 2019:

• $150 million in January 2019;

• $150 million in 2018;

• $162 million in 2017; and,

• $125 million in 2016

Future amounts may change based on actual market performance, changes in interest rates and any changes in governmental regulations. Therefore, additional contributions could be required in the future.

Xcel Energy contributed $11 million, $20 million and $18 million during 2018, 2017 and 2016, respectively, to the postretirement health care plans. Xcel Energy expects to contribute approximately $11 million during 2019.

Xcel Energy recovers employee benefits costs in its utility operations consistent with accounting guidance with the exception of the areas noted below.

• NSP-Minnesota recognizes pension expense in all regulatory jurisdictions using the aggregate normal cost actuarial method. Differences between aggregate normal cost and expense as calculated by pension accounting standards are deferred as a regulatory liability.

• In 2018, the PSCW approved NSP-Wisconsin’s request for deferred accounting treatment of the 2018 pension settlement accounting expense.

• Regulatory Commissions in Colorado, Texas, New Mexico and FERC jurisdictions allow the recovery of other postretirement benefit costs only to the extent that recognized expense is matched by cash contributions to an irrevocable trust. Xcel Energy has consistently funded at a level to allow full recovery of costs in these jurisdictions.

• PSCo and SPS recognize pension expense in all regulatory jurisdictions based on expense consistent with accounting guidance. The Texas and Colorado electric retail jurisdictions and the Colorado gas retail jurisdiction, each record the difference between annual recognized pension expense and the annual amount of pension expense approved in their last respective general rate case as a deferral to a regulatory asset.

• In 2018, PSCo was required to create a regulatory liability to adjust postretirement health care costs to zero in order to match the amounts collected in rates in the Colorado Gas retail jurisdiction.

See Note 11 to the consolidated financial statements for further information.

Nuclear Decommissioning

Xcel Energy recognizes liabilities for the expected cost of retiring tangible long-lived assets for which a legal obligation exists. These AROs are recognized at fair value as incurred and are capitalized as part of the cost of the related long-lived assets. In the absence of quoted market prices, Xcel Energy estimates the fair value of its AROs using present value techniques, in which it makes assumptions including estimates of the amounts and timing of future cash flows associated with retirement activities, credit-adjusted risk free rates and cost escalation rates. When Xcel Energy revises any assumptions, it adjusts the carrying amount of both the ARO liability and related long-lived asset. ARO liabilities are accreted to reflect the passage of time using the interest method.

A significant portion of Xcel Energy’s AROs relates to the future decommissioning of NSP-Minnesota’s nuclear facilities. The nuclear decommissioning obligation is funded by the external decommissioning trust fund. Difference between regulatory funding (including depreciation expense less returns from the external trust fund) and expense recognized is deferred as a regulatory asset. The amounts recorded for AROs related to future nuclear decommissioning were $1.968 billion in 2018 and $1.874 billion in 2017.

NSP-Minnesota obtains periodic independent cost studies in order to estimate the cost and timing of planned nuclear decommissioning activities. Estimates of future cash flows are highly uncertain and may vary significantly from actual results. NSP-Minnesota is required to file a nuclear decommissioning filing every three years. The filing covers all expenses for the decommissioning of the nuclear plants, including decontamination and removal of radioactive material.

The most recent triennial filing was approved by the MPUC in January 2019 and resulted in no change to the accrual. The 2020 accrual will be set subsequent to a compliance filing that is expected to be submitted in July 2019.

The following assumptions have a significant effect on the estimated nuclear obligation:

Timing— Decommissioning cost estimates are impacted by each facility’s retirement date and timing of the actual decommissioning activities. Estimated retirement dates coincide with the expiration of each unit’s operating license with the NRC (i.e., 2030 for Monticello and 2033 and 2034 for PI’s Unit 1 and 2, respectively). The estimated timing of the decommissioning activities is based upon the DECON method, which assumes prompt removal and dismantlement. The use of the DECON method is required by the MPUC. Decommissioning activities are expected to begin at the end of the license date and be completed for both facilities by 2091.

Technology and Regulation — There is limited experience with actual decommissioning of large nuclear facilities. Changes in technology, experience and regulations could cause cost estimates to change significantly.

Escalation Rates — Escalation rates represent projected cost increases due to general inflation and increases in the cost of decommissioning activities. NSP-Minnesota used an escalation rate of 3.4% in calculating the ARO for nuclear decommissioning of its nuclear facilities, based on the weighted averages of labor and non-labor escalation factors calculated by Goldman Sachs Asset Management.

Discount Rates — Changes in timing or estimated cash flows that result in upward revisions to the ARO are calculated using the then-current credit-adjusted risk-free interest rate. The credit-adjusted risk-free rate in effect when the change occurs is used to discount the revised estimate of the incremental expected cash flows of the retirement activity. If the change in timing or estimated expected cash flows results in a downward revision of the ARO, the undiscounted revised estimate of expected cash flows is discounted using the credit-adjusted risk-free rate in effect at the date of initial measurement and recognition of the original ARO. Discount rates ranging from approximately 4% to 7% have been used to calculate the net present value of the expected future cash flows over time.

Significant uncertainties exist in estimating future costs including the method to be utilized, ultimate costs to decommission and planned method of disposing spent fuel. If different cost estimates, life assumptions or cost escalation rates were utilized, the AROs could change materially. However, changes in estimates have minimal impact on results of operations as NSP-Minnesota expects to continue to recover all costs in future rates.

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Xcel Energy continually makes judgments and estimates related to these critical accounting policy areas, based on an evaluation of the assumptions and uncertainties for each area. The information and assumptions of these judgments and estimates will be affected by events beyond the control of Xcel Energy, or otherwise change over time. This may require adjustments to recorded results to better reflect updated information that becomes available. The accompanying financial statements reflect management’s best estimates and judgments of the impact of these factors as of Dec. 31, 2018.

See Note 12 to the consolidated financial statements for further information.

Derivatives, Risk Management and Market Risk

Xcel Energy Inc. and its subsidiaries are exposed to a variety of market risks in the normal course of business. Market risk is the potential loss that may occur as a result of adverse changes in the market or fair value of a particular instrument or commodity. All financial and commodity-related instruments, including derivatives, are subject to market risk.

See Note 10 to the consolidated financial statements for further information.

Xcel Energy is exposed to the impact of adverse changes in price for energy and energy-related products, which is partially mitigated by the use of commodity derivatives. In addition to ongoing monitoring and maintaining credit policies intended to minimize overall credit risk, management takes steps to mitigate changes in credit and concentration risks associated with its derivatives and other contracts, including parental guarantees and requests of collateral. While Xcel Energy expects that the counterparties will perform under the contracts underlying its derivatives, the contracts expose Xcel Energy to certain credit and non-performance risk.

Distress in the financial markets may impact counterparty risk, the fair value of the securities in the nuclear decommissioning fund and pension fund and Xcel Energy’s ability to earn a return on short-term investments.

Commodity Price Risk — Xcel Energy Inc.’s utility subsidiaries are exposed to commodity price risk in their electric and natural gas operations. Commodity price risk is managed by entering into long- and short-term physical purchase and sales contracts for electric capacity, energy and energy-related products and fuels used in generation and distribution activities. Commodity price risk is also managed through the use of financial derivative instruments. Xcel Energy’s risk management policy allows it to manage commodity price risk within each rate-regulated operation per commission approved hedge plans.

Wholesale and Commodity Trading Risk — Xcel Energy Inc.’s utility subsidiaries conduct various wholesale and commodity trading activities, including the purchase and sale of electric capacity, energy, energy-related instruments and natural gas-related instruments, including derivatives. Xcel Energy’s risk management policy allows management to conduct these activities within guidelines and limitations as approved by its risk management committee.

At Dec. 31, 2018, fair values by source for net commodity trading contract assets were as follows:

	Futures / Forwards
(Millions  of Dollars)	Source of Fair Value	Maturity Less Than 1 Year		Maturity 1 to 3 Years		Maturity 4 to 5 Years		Maturity Greater Than 5 Years		Total Futures / Forwards Fair Value
NSP-Minnesota	2	$	3	$	5	$	2	$	1	$	11
PSCo	2	1		—		—		—		1
		$	4	$	5	$	2	$	1	$	12

	Options
(Millions) of Dollars)	Source of Fair Value	Maturity Less Than 1 Year		Maturity 1 to 3 Years		Maturity 4 to 5 Years		Maturity Greater Than 5 Years		Total Options Fair Value
NSP-Minnesota	2	$	—	$	4	$	1	$	—	$	5

2 — Prices based on models and other valuation methods.

Changes in the fair value of commodity trading contracts before the impacts of margin-sharing for the years ended Dec. 31 were as follows:

(Millions of Dollars)	2018			2017
Fair value of commodity trading net contract assets outstanding at Jan. 1	$	16		$	10
Contracts realized or settled during the period	(10		)	(5		)
Commodity trading contract additions and changes during the period	11			11
Fair value of commodity trading net contract assets outstanding at Dec. 31	$	17		$	16

At Dec. 31, 2018, a 10% increase in market prices for commodity trading contracts would increase pretax income by approximately $16 million, whereas a 10% decrease would decrease pretax income by approximately $16 million. At Dec. 31, 2017, a 10% increase or decrease in market prices for commodity trading contracts would have an immaterial impact.

Xcel Energy Inc.’s utility subsidiaries’ wholesale and commodity trading operations measure the outstanding risk exposure to price changes on transactions, contracts and obligations using VaR. VaR expresses the potential change in fair value on the outstanding transactions, contracts and obligations over a particular period of time under normal market conditions.

VaRs for the NSP-Minnesota and PSCo commodity trading operations, calculated on a consolidated basis using a Monte Carlo simulation with a 95% confidence level and a one-day holding period:

(Millions of Dollars)	Year Ended Dec. 31		VaR Limit		Average		High		Low
2018	$	4.83	$	6.00	$	0.62	$	5.63	$	0.06
2017	0.18		3.00		0.21		0.66		0.04

In November 2018, management temporarily increased the VaR limit to accommodate a 10-year transaction. NSP-Minnesota has been systematically hedging the transaction and the consolidated VaR returned below $3 million in January 2019.

Nuclear Fuel Supply — NSP-Minnesota is scheduled to take delivery of approximately 24% of its 2019 and approximately 54% of its 2020 enriched nuclear material requirements from sources that could be impacted by events in Ukraine and extended sanctions against Russia. Long-term, through 2024, NSP-Minnesota is scheduled to take delivery of approximately 32% of its average enriched nuclear material requirements from these sources. Alternate potential sources provide the flexibility to manage NSP-Minnesota’s nuclear fuel supply. NSP-Minnesota periodically assesses if further actions are required to assure a secure supply of enriched nuclear material.

Disruptions in third party nuclear fuel supply contracts due to bankruptcies or change of contract assignments have not materially impacted NSP-Minnesota’s operational or financial performance.

Interest Rate Risk — Xcel Energy is subject to interest rate risk. Xcel Energy’s risk management policy allows interest rate risk to be managed through the use of fixed rate debt, floating rate debt and interest rate derivatives such as swaps, caps, collars and put or call options.

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A 100 basis point change in the benchmark rate on Xcel Energy’s variable rate debt would impact annual pretax interest expense by approximately $10 million in 2018 and $9 million in 2017.

NSP-Minnesota maintains a nuclear decommissioning fund, as required by the NRC. The nuclear decommissioning fund is subject to interest rate risk and equity price risk. The fund is invested in a diversified portfolio of cash equivalents, debt securities, equity securities and other investments. These investments may be used only for the purpose of decommissioning NSP-Minnesota’s nuclear generating plants.

Realized and unrealized gains on the decommissioning fund investments are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Fluctuations in equity prices or interest rates affecting the nuclear decommissioning fund do not have a direct impact on earnings due to the application of regulatory accounting. See Note 10 to the consolidated financial statements for further information.

Changes in discount rates and expected return on plan assets impact the value of pension and postretirement plan assets as well as benefit costs.

See Note 11 to the consolidated financial statements for further information.

Credit Risk — Xcel Energy Inc. and its subsidiaries are also exposed to credit risk. Credit risk relates to the risk of loss resulting from counterparties’ nonperformance on their contractual obligations. Xcel Energy Inc. and its subsidiaries maintain credit policies intended to minimize overall credit risk and actively monitor these policies to reflect changes and scope of operations.

At Dec. 31, 2018, a 10% increase in commodity prices would have resulted in an increase in credit exposure of $14 million, while a decrease in prices of 10% would have resulted in an increase in credit exposure of $3 million. At Dec. 31, 2017, a 10% increase in commodity prices would have resulted in an increase in credit exposure of $26 million, while a decrease in prices of 10% would have resulted in an increase in credit exposure of $7 million.

Xcel Energy Inc. and its subsidiaries conduct credit reviews for all counterparties and employ credit risk controls, such as letters of credit, parental guarantees, master netting agreements and termination provisions. Credit exposure is monitored, and when necessary, the activity with a specific counterparty is limited until credit enhancement is provided. Distress in the financial markets could increase Xcel Energy’s credit risk.

Fair Value Measurements

Xcel Energy uses derivative contracts such as futures, forwards, interest rate swaps, options and FTRs to manage commodity price and interest rate risk. Derivative contracts, with the exception of those designated as normal purchase-normal sale contracts, are reported at fair value. Xcel Energy’s investments held in the nuclear decommissioning fund, rabbi trusts, pension and other postretirement funds are also subject to fair value accounting.

See Notes 10 and 11 to the consolidated financial statements for further information.

Commodity Derivatives — Xcel Energy monitors the creditworthiness of the counterparties to its commodity derivative contracts and assesses each counterparty’s ability to perform on the transactions. Given the typically short duration of these contracts, the impact of discounting commodity derivative assets for counterparty credit risk was not material to the fair value of commodity derivative assets at Dec. 31, 2018.

Adjustments to fair value for credit risk of commodity trading instruments are recorded in electric revenues. Credit risk adjustments for other commodity derivative instruments are recorded as other comprehensive income or deferred as regulatory assets and liabilities. Classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms. The impact of discounting commodity derivative liabilities for credit risk was immaterial at Dec. 31, 2018.

Liquidity and Capital Resources

Cash Flows

(Millions of Dollars)	2018		2017		2016
Net cash provided by operating activities	$	3,122	$	3,126	$	3,052

Net cash provided by operating activities decreased by $4 million for 2018 as compared to 2017. Change was primarily due to refunds associated with the TCJA and timing of certain electric and natural gas recovery mechanisms, partially offset by the change in net income (excluding amounts related to non-cash operating activities (e.g., depreciation and deferred tax expenses)).

Net cash provided by operating activities increased by $74 million for 2017 as compared to 2016. Increase was primarily due to higher net income, excluding amounts related to non-cash operating activities (e.g., depreciation and deferred tax expenses) and timing of customer receipts, partially offset by higher interest payments and pension contributions, refunds, timing of vendor payments and lower income tax refunds.

(Millions of Dollars)	2018			2017			2016
Net cash used in investing activities	$	(3,986	)	$	(3,296	)	$	(3,261	)

Net cash used in investing activities increased by $690 million for 2018 as compared to 2017. Increase was largely related to higher capital expenditures for the Rush Creek, Foxtail and Hale wind generation facilities.

Net cash used in investing activities increased by $35 million for 2017 as compared to 2016. Increase was mainly attributable to capital expenditures related to the Rush Creek wind generation facility, partially offset by amounts for the Courtenay wind farm and less rabbi trust investments.

(Millions of Dollars)	2018		2017		2016
Net cash provided by financing activities	$	928	$	168	$	209

Net cash provided by financing activities increased by $760 million for 2018 as compared to 2017. Increase was primarily due to lower repayments of long-term debt, proceeds from the issuances of common stock and additional debt financings, partially offset by lower short-term debt proceeds as compared to 2017.

Net cash provided by financing activities decreased by $41 million for 2017 as compared to 2016. Decrease was primarily due to lower proceeds from debt issuances and higher dividend payments, partially offset by higher short-term debt proceeds and lower repurchases of common stock in 2017.

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Capital Requirements

Xcel Energy expects to meet future financing requirements by periodically issuing short-term debt, long-term debt, common stock, hybrid and other securities to maintain desired capitalization ratios.

Contractual Obligations and Other Commitments — Xcel Energy has contractual obligations and other commitments that will need to be funded in the future. Contractual obligations and other commercial commitments as of Dec. 31, 2018 were as follows:

	Payments Due by Period
(Millions of Dollars)	Total		Less than 1 Year		1 to 3 Years		3 to 5 Years		After 5 Years
Long-term debt, principal and interest payments	$	27,538	$	1,062	$	2,910	$	2,711	$	20,855
Capital lease obligations	286		14		28		24		220
Operating leases (a)	2,174		239		469		429		1,037
Unconditional purchase obligations (b)	6,700		1,457		1,990		1,432		1,821
Other long-term obligations, including current portion	716		57		98		64		497
Other short-term obligations	405		405		—		—		—
Short-term debt	1,038		1,038		—		—		—
Total contractual cash obligations	$	38,857	$	4,272	$	5,495	$	4,660	$	24,430

^(a)  Included in operating lease payments are $207 million, $418 million, $383 million and $0.9 billion, for the less than 1 year, 1 - 3 years, 3 - 5 years and after 5 years categories, respectively, pertaining to PPAs that were accounted for as operating leases.

^(b)  Xcel Energy Inc. and its subsidiaries have contracts providing for the purchase and delivery of a significant portion of its coal, nuclear fuel and natural gas requirements. Additionally, the utility subsidiaries of Xcel Energy Inc. have entered into non-lease purchase power agreements. Certain contractual purchase obligations are adjusted on indices. Effects of price changes are mitigated through cost of energy adjustment mechanisms.

See Notes 5 and 12 to the consolidated financial statements for further information.

Capital Expenditures — Current estimated base capital expenditure programs of Xcel Energy’s operating companies for the years 2019 - 2023:

	Capital Forecast
(Millions of Dollars)	2019			2020			2021			2022		2023		2019 - 2023 Total
By Subsidiary
NSP-Minnesota	$	2,825		$	1,290		$	1,540		$	1,300	$	1,380	$	8,335
PSCo	1,370			1,380			1,335			1,395		1,530		7,010
SPS	1,130			770			460			530		635		3,525
NSP-Wisconsin	240			240			300			305		275		1,360
Other (a)	(50		)	(70		)	(25		)	10		15		(120		)
Total capital expenditures	$	5,515		$	3,610		$	3,610		$	3,540	$	3,835	$	20,110

	Capital Forecast
(Millions of Dollars)	2019		2020		2021		2022		2023		2019 - 2023 Total
By Function
Electric distribution	$	775	$	865	$	1,150	$	1,245	$	1,270	$	5,305
Electric transmission	580		560		950		870		1,055		4,015
Renewables	2,315		1,105		240		—		—		3,660
Electric generation	1,070		310		480		560		545		2,965
Natural gas	430		415		420		510		595		2,370
Other (b)	345		355		370		355		370		1,795
Total capital expenditures	$	5,515	$	3,610	$	3,610	$	3,540	$	3,835	$	20,110

^(a)  Other category includes intercompany transfers for safe harbor wind turbines.

^(b)  Amounts in other category are net of intercompany transfers.

Xcel Energy’s capital expenditure program is subject to continuous review and modification. Actual capital expenditures may vary from estimates due to changes in electric and natural gas projected load growth, regulatory decisions, legislative initiatives, reserve margin requirements, availability of purchased power, alternative plans for meeting long-term energy needs, compliance with environmental requirements, RPS and merger, acquisition and divestiture opportunities.

Xcel Energy issues debt and equity securities to refinance retiring maturities, reduce short-term debt, fund capital programs, infuse equity in subsidiaries, fund asset acquisitions and for other general corporate purposes.

41

Financing Capital Expenditures through 2023 — Xcel Energy issues debt and equity securities to refinance retiring maturities, reduce short-term debt, fund capital programs, infuse equity in subsidiaries, fund asset acquisitions and for other general corporate purposes. Current estimated financing plans of Xcel Energy for 2019 - 2023:

(Millions of Dollars)
Funding Capital Expenditures
Cash from Operations*	$	13,070
New Debt**	6,190
Equity through the DRIP and Benefit Program	390
Equity through forward equity agreements	460
Base Capital Expenditures 2019 - 2023	$	20,110
Maturing Debt	$	3,645

^{* Net of dividends and pension funding.} 

^{** Reflects a combination of short and long-term debt; net of refinancing.} 

Common Stock Dividends — Future dividend levels will be dependent on Xcel Energy’s results of operations, financial condition, cash flows, reinvestment opportunities and other factors, and will be evaluated by the Xcel Energy Inc. Board of Directors. In February 2019, Xcel Energy announced a quarterly dividend of $0.405 per share, which represents an increase of 6.6%. Xcel Energy’s dividend policy balances the following:

• Projected cash generation;

• Projected capital investment;

• A reasonable rate of return on shareholder investment; and,

• The impact on Xcel Energy’s capital structure and credit ratings.

In addition, there are certain statutory limitations that could affect dividend levels. Federal law places limits on the ability of public utilities within a holding company system to declare dividends. Specifically, under the Federal Power Act, a public utility may not pay dividends from any funds properly included in a capital account. The utility subsidiaries’ dividends may be limited directly or indirectly by state regulatory commissions or bond indenture covenants.

See Note 5 to the consolidated financial statements for further information.

Pension Fund— Xcel Energy’s pension assets are invested in a diversified portfolio of domestic and international equity securities, short-term to long-duration fixed income securities and alternative investments, including private equity, real estate and hedge funds. Funded status and pension assumptions:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
Fair value of pension assets	$	2,742		$	3,088
Projected pension obligation (a)	3,477			3,828
Funded status	$	(735	)	$	(740	)

^(a)  Excludes non-qualified plan of $33 million and $37 million at Dec. 31, 2018 and 2017, respectively.

Pension Assumptions	2018		2017
Discount rate	4.31	%	3.63	%
Expected long-term rate of return	6.87		6.87

Capital Sources

Short-Term Funding Sources — Xcel Energy uses a number of sources to fulfill short-term funding needs, including operating cash flow, notes payable, commercial paper and bank lines of credit. The amount and timing of short-term funding needs depend on financing needs for construction expenditures, working capital and dividend payments.

Short-Term Investments — Xcel Energy Inc., NSP-Minnesota, NSP-Wisconsin, PSCo and SPS maintain cash operating and short-term investment accounts.

Short-Term Debt — Xcel Energy Inc., NSP-Minnesota, NSP-Wisconsin, PSCo and SPS each have individual commercial paper programs. Authorized levels for these commercial paper programs are:

• $1 billion for Xcel Energy Inc.;

• $700 million for PSCo;

• $500 million for NSP-Minnesota;

• $400 million for SPS; and,

• $150 million for NSP-Wisconsin.

In addition, Xcel Energy Inc. has a 364-day term loan agreement to borrow up to $500 million. As of Dec. 31, 2018, $250 million of borrowings were outstanding with $250 million additional borrowing capacity. In February 2019, Xcel Energy borrowed the remaining $250 million. No additional borrowing capacity currently remains.

Xcel Energy’s outstanding short-term debt:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Dec. 31, 2018
Borrowing limit	$	3,250
Amount outstanding at period end	1,038
Average amount outstanding	500
Maximum amount outstanding	1,038
Weighted average interest rate, computed on a daily basis	2.76		%
Weighted average interest rate at end of period	2.97

(Amounts in Millions, Except Interest Rates)	Year Ended Dec. 31, 2018			Year Ended Dec. 31, 2017			Year Ended Dec. 31, 2016
Borrowing limit	$	3,250		$	3,250		$	2,750
Amount outstanding at period end	1,038			814			392
Average amount outstanding	788			644			485
Maximum amount outstanding	1,349			1,247			1,183
Weighted average interest rate, computed on a daily basis	2.34		%	1.35		%	0.74		%
Weighted average interest rate at end of period	2.97			1.90			0.95

Credit Facility Agreements— Xcel Energy Inc., NSP-Minnesota, PSCo and SPS each have the right to request an extension of the revolving credit facility for two additional one-year periods beyond the June 2021 termination date. NSP-Wisconsin has the right to request an extension of the revolving credit facility termination date for an additional one-year period. All extension requests are subject to majority bank group approval.

As of Feb. 20, 2019, Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available to meet liquidity needs:

(Millions of Dollars)	Facility		Drawn(a)		Available		Cash		Liquidity
Xcel Energy Inc.	$	1,500	$	786	$	714	$	—	$	714
PSCo	700		224		476		1		477
NSP-Minnesota	500		152		348		1		349
SPS	400		128		272		—		272
NSP-Wisconsin	150		29		121		1		122
Total	$	3,250	$	1,319	$	1,931	$	3	$	1,934

^(a)  Includes outstanding commercial paper, term loan borrowings and letters of credit.

42

Registration Statements — Xcel Energy Inc.’s Articles of Incorporation authorize the issuance of one billion shares of $2.50 par value common stock. As of Dec. 31, 2018 and 2017, Xcel Energy Inc. had approximately 514 million shares and 508 million shares of common stock outstanding, respectively.

Xcel Energy Inc. and its utility subsidiaries have registration statements on file with the SEC pursuant to which they may sell securities from time to time. These registration statements, which are uncapped, permit Xcel Energy Inc. and its utility subsidiaries to issue debt and other securities in the future at amounts, prices and with terms to be determined at the time of future offerings, and in the case of our utility subsidiaries, subject to commission approval.

Planned Financing Activity— Xcel Energy Inc. and its utility subsidiaries’ 2019 financing plans reflect the following:

• Xcel Energy Inc. — approximately $700 million of senior notes and approximately $75 to $80 million of equity through the DRIP and benefit programs;

• NSP-Minnesota — approximately $900 million of first mortgage bonds;

• PSCo — approximately $800 million of first mortgage bonds; and,

• SPS — approximately $300 million of first mortgage bonds.

Forward Equity Agreements —In November 2018, Xcel Energy Inc. entered into forward sale agreements in connection with a completed $459 million public offering of 9.4 million shares of Xcel Energy common stock. The initial forward agreement was for 8.1 million shares with an additional forward agreement of 1.2 million shares exercised at the option of the banking counterparty. At Dec. 31, 2018, the forward agreements could have been settled with physical delivery of 9.4 million common shares to the banking counterparty in exchange for cash of $456 million. The forward instruments could also have been settled at Dec. 31, 2018 with delivery of approximately $24 million of cash or approximately 0.5 million shares of common stock to the banking counterparty, if Xcel Energy unilaterally elected net cash or net share settlement, respectively.

The forward price used to determine amounts due at settlement is calculated based on the November 2018 public offering price for Xcel Energy’s common stock of $49.00, increased for the overnight bank funding rate, less a spread of 0.75% and less expected dividends on Xcel Energy’s common stock during the period the instruments are outstanding.

Xcel Energy may settle the forward agreements at any time up to the maturity date of February 7, 2020. The cash proceeds, depending on the timing of settlement, are expected to be approximately $450 million to $460 million.

Forward equity instruments were accounted for as stockholders’ equity and recorded at fair value at the execution of the forward agreements, and will not be subsequently adjusted for changes in fair value until settlement.

ATM Equity Offering —In 2018, Xcel Energy issued 4.7 million shares of common stock with net proceeds of $224.7 million through the at the market program. In addition, total transaction fees of $1.9 million were paid. In November 2018, the ATM offering was closed.

Other Equity — Xcel Energy also plans to issue approximately $75 to $80 million of equity, each year, through the DRIP and benefit programs during the five-year forecast time period.

Long-Term Borrowings and Other Financing Instruments— See Note 5 to the consolidated financial statements for further information.

Off-Balance-Sheet Arrangements

Xcel Energy does not have any off-balance-sheet arrangements, other than those currently disclosed, that have or are reasonably likely to have a current or future effect on financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that is material to investors.

Earnings Guidance

2019 GAAP and ongoing earnings guidance is a range of $2.55 to $2.65 per share.^(a) Key assumptions:

• Constructive outcomes in all rate case and regulatory proceedings.

• Normal weather patterns for the year.

• Weather-normalized retail electric sales are projected to be relatively consistent with 2018 levels.

• Weather-normalized retail natural gas sales are projected to be within a range of 0.0% to 1.0% over 2018 levels.

• Capital rider revenue is projected to increase $115 million to $125 million (net of PTCs) over 2018 levels. PTCs are flowed back to customers, primarily through capital riders as reductions to electric margin.

• Purchase capacity costs are expected to decline $25 million to $30 million compared with 2018 levels.

• O&M expenses are projected to be consistent with 2017 levels.

• Depreciation expense is projected to increase approximately $120 million to $130 million over 2018 levels. Depreciation expense includes $34 million for the amortization of a prepaid pension asset at PSCo, which is TCJA related and will not impact earnings.

• Property taxes are projected to increase approximately $15 million to $25 million over 2018 levels.

• Interest expense (net of AFUDC — debt) is projected to increase $90 million to $100 million over 2018 levels.

• AFUDC — equity is projected to decrease approximately $20 million to $30 million from 2018 levels.

• The ETR is projected to be approximately 6% to 8%. The ETR reflects benefits of PTCs which are flowed back to customers through electric margin.

• Assumptions do not include the impact for the upcoming adoption of the new lease accounting standard, effective 2019. Xcel Energy does not expect changes in the accounting for leases to impact earnings, but it may result in variations in certain line items within the statement of income.

^(a) Ongoing earnings is calculated using net income and adjusting for certain nonrecurring or infrequent items that are, in management’s view, not reflective of ongoing operations. Ongoing earnings could differ from those prepared in accordance with GAAP for unplanned and/or unknown adjustments. Xcel Energy is unable to forecast if any of these items will occur or provide a quantitative reconciliation of the guidance for ongoing EPS to corresponding GAAP EPS.

Item 7A — Quantitative and Qualitative Disclosures About Market Risk

See Item 7, incorporated by reference.

Item 8 — Financial Statements and Supplementary Data

See Item 15-1 for an index of financial statements included herein.

See Note 15 to the consolidated financial statements for further information.

43

Management Report on Internal Controls Over Financial Reporting

The management of Xcel Energy Inc. is responsible for establishing and maintaining adequate internal control over financial reporting. Xcel Energy Inc.’s internal control system was designed to provide reasonable assurance to Xcel Energy Inc.’s management and board of directors regarding the preparation and fair presentation of published financial statements.

All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation.

Xcel Energy Inc. management assessed the effectiveness of Xcel Energy Inc.’s internal control over financial reporting as of Dec. 31, 2018. In making this assessment, it used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control — Integrated Framework (2013). Based on our assessment, we believe that, as of Dec. 31, 2018, Xcel Energy Inc.’s internal control over financial reporting is effective at the reasonable assurance level based on those criteria.

Xcel Energy Inc.’s independent registered public accounting firm has issued an audit report on the Xcel Energy Inc.’s internal control over financial reporting. Its report appears herein.

/s/ BEN FOWKE	/s/ ROBERT C. FRENZEL
Ben Fowke	Robert C. Frenzel
Chairman, President and Chief Executive Officer	Executive Vice President, Chief Financial Officer
Feb. 22, 2019	Feb. 22, 2019

44

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of Xcel Energy Inc.

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Xcel Energy Inc. and subsidiaries (the "Company") as of December 31, 2018 and 2017, the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2018, and the related notes and the schedules listed in the Index at Item 15 (collectively referred to as the "financial statements"). We also have audited the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) issued by COSO.

Basis for Opinions

The Company’s management is responsible for these financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management Report on Internal Controls over Financial Reporting. Our responsibility is to express an opinion on these financial statements and an opinion on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the financial statements included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures to respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ DELOITTE & TOUCHE LLP

Minneapolis, Minnesota

February 22, 2019

We have served as the Company’s auditor since 2002.

45

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (amounts in millions, except per share data)
	Year Ended Dec. 31
	2018			2017			2016
Operating revenues
Electric	$	9,719		$	9,676		$	9,500
Natural gas	1,739			1,650			1,531
Other	79			78			76
Total operating revenues	11,537			11,404			11,107
Operating expenses
Electric fuel and purchased power	3,854			3,757			3,718
Cost of natural gas sold and transported	843			823			733
Cost of sales — other	35			34			36
Operating and maintenance expenses	2,352			2,270			2,300
Conservation and demand side management program expenses	290			273			245
Depreciation and amortization	1,642			1,479			1,303
Taxes (other than income taxes)	556			545			532
Total operating expenses	9,572			9,181			8,867
Operating income	1,965			2,223			2,240
Other expense, net	(14		)	(10		)	(18		)
Equity earnings of unconsolidated subsidiaries	35			30			42
Allowance for funds used during construction — equity	108			75			60
Interest charges and financing costs
Interest charges — includes other financing costs of $25, $24 and $25, respectively	700			663			647
Allowance for funds used during construction — debt	(48		)	(35		)	(27		)
Total interest charges and financing costs	652			628			620
Income before income taxes	1,442			1,690			1,704
Income taxes	181			542			581
Net income	$	1,261		$	1,148		$	1,123
Weighted average common shares outstanding:
Basic	511			509			509
Diluted	511			509			509
Earnings per average common share:
Basic	$	2.47		$	2.26		$	2.21
Diluted	2.47			2.25			2.21
See Notes to Consolidated Financial Statements

46

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (amounts in millions)
	Year Ended Dec. 31
	2018			2017			2016
Net income	$	1,261		$	1,148		$	1,123
Other comprehensive income (loss)
Pension and retiree medical benefits:
Net pension and retiree medical losses arising during the period, net of tax of $(2), $(2), and $(5), respectively	(6		)	(3		)	(8		)
Amortization of losses included in net periodic benefit cost, net of tax of $3, $5, and $2, respectively	9			7			4
	3			4			(4		)
Derivative instruments:
Net fair value decrease, net of tax of $(2), $0, and $0, respectively	(5		)	—			—
Reclassification of losses to net income, net of tax of $1, $2, and $2, respectively	3			3			4
	(2		)	3			4
Other comprehensive income	1			7			—
Comprehensive income	$	1,262		$	1,155		$	1,123
See Notes to Consolidated Financial Statements

47

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (amounts in millions)
	Year Ended Dec. 31
	2018			2017			2016
Operating activities
Net income	$	1,261		$	1,148		$	1,123
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,659			1,495			1,319
Nuclear fuel amortization	122			114			117
Deferred income taxes	218			640			587
Allowance for equity funds used during construction	(108		)	(75		)	(60		)
Equity earnings of unconsolidated subsidiaries	(35		)	(30		)	(42		)
Dividends from unconsolidated subsidiaries	37			41			46
Provision for bad debts	42			39			39
Share-based compensation expense	45			57			41
Net realized and unrealized hedging and derivative transactions	22			2			8
Changes in operating assets and liabilities:
Accounts receivable	(105		)	(60		)	(83		)
Accrued unbilled revenues	9			(34		)	(75		)
Inventories	(65		)	(3		)	1
Other current assets	18			9			61
Accounts payable	90			43			118
Net regulatory assets and liabilities	223			(16		)	(19		)
Other current liabilities	(61		)	(38		)	20
Pension and other employee benefit obligations	(179		)	(133		)	(91		)
Other, net	(71		)	(73		)	(58		)
Net cash provided by operating activities	3,122			3,126			3,052
Investing activities
Utility capital/construction expenditures	(3,957		)	(3,244		)	(3,195		)
Purchases of investment securities	(853		)	(1,697		)	(547		)
Proceeds from the sale of investment securities	833			1,669			479
Other, net	(9		)	(24		)	2
Net cash used in investing activities	(3,986		)	(3,296		)	(3,261		)
Financing activities
Proceeds from (repayments of) short-term borrowings, net	225			422			(454		)
Proceeds from issuance of long-term debt	1,675			1,518			2,424
Repayments of long-term debt, including reacquisition premiums	(452		)	(1,030		)	(1,036		)
Proceeds from issuance of common stock	230			—			—
Repurchases of common stock	(1		)	(3		)	(32		)
Dividends paid	(730		)	(721		)	(681		)
Other, net	(19		)	(18		)	(12		)
Net cash provided by financing activities	928			168			209
Net change in cash and cash equivalents	64			(2		)	—
Cash and cash equivalents at beginning of period	83			85			85
Cash and cash equivalents at end of period	$	147		$	83		$	85
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	$	(633	)	$	(616	)	$	(592	)
Cash received for income taxes, net	27			44			62
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	$	388		$	464		$	311
Inventory transfers to property, plant and equipment	129			63			107
Allowance for equity funds used during construction	108			75			61
Issuance of common stock for reinvested dividends and equity awards	67			31			29
See Notes to Consolidated Financial Statements

48

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (amounts in millions, except share and per share)
	Dec. 31
	2018			2017
Assets
Current assets
Cash and cash equivalents	$	147		$	83
Accounts receivable, net	860			797
Accrued unbilled revenues	755			764
Inventories	548			610
Regulatory assets	464			424
Derivative instruments	87			44
Prepaid taxes	79			68
Prepayments and other	154			183
Total current assets	3,094			2,973
Property, plant and equipment, net	36,944			34,329
Other assets
Nuclear decommissioning fund and other investments	2,317			2,397
Regulatory assets	3,326			3,005
Derivative instruments	34			48
Deposits and other	272			278
Total other assets	5,949			5,728
Total assets	$	45,987		$	43,030
Liabilities and Equity
Current liabilities
Current portion of long-term debt	$	406		$	457
Short-term debt	1,038			814
Accounts payable	1,237			1,243
Regulatory liabilities	436			239
Taxes accrued	450			448
Accrued interest	174			174
Dividends payable	195			183
Derivative instruments	61			29
Other	463			501
Total current liabilities	4,460			4,088
Deferred credits and other liabilities
Deferred income taxes	4,165			3,845
Deferred investment tax credits	54			58
Regulatory liabilities	5,187			5,083
Asset retirement obligations	2,568			2,475
Derivative instruments	129			126
Customer advances	199			193
Pension and employee benefit obligations	994			1,042
Other	206			145
Total deferred credits and other liabilities	13,502			12,967
Commitments and contingencies
Capitalization
Long-term debt	15,803			14,520
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 514,036,787 and 507,762,881 shares outstanding at Dec. 31, 2018 and 2017, respectively	1,285			1,269
Additional paid in capital	6,168			5,898
Retained earnings	4,893			4,413
Accumulated other comprehensive loss	(124		)	(125		)
Total common stockholders’ equity	12,222			11,455
Total liabilities and equity	$	45,987		$	43,030
See Notes to Consolidated Financial Statements

49

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS’ EQUITY (amounts in millions, shares in thousands)
	Common Stock Issued											Accumulated Other Comprehensive Loss			Total Common Stockholders’ Equity
	Shares		Par Value			Additional Paid In Capital			Retained Earnings
Balance at Dec. 31, 2015	507,536		$	1,269		$	5,889		$	3,553		$	(110	)	$	10,601
Net income									1,123						1,123
Dividends declared on common stock ($1.36 per share)									(694		)				(694		)
Issuances of common stock	486		1			15									16
Repurchases of common stock	(799	)	(2		)	(30		)							(32		)
Share-based compensation						7									7
Balance at Dec. 31, 2016	507,223		$	1,268		$	5,881		$	3,982		$	(110	)	$	11,021
Net income									1,148						1,148
Other comprehensive income												7			7
Dividends declared on common stock ($1.44 per share)									(736		)				(736		)
Issuances of common stock	611		1			4									5
Repurchases of common stock	(71	)	—			(3		)							(3		)
Share-based compensation						16			(3		)				13
Adoption of ASU No. 2018-02									22			(22		)	—
Balance at Dec. 31, 2017	507,763		$	1,269		$	5,898		$	4,413		$	(125	)	$	11,455
Net income									1,261						1,261
Other comprehensive income												1			1
Dividends declared on common stock ($1.52 per share)									(780		)				(780		)
Issuances of common stock	6,296		16			254									270
Repurchases of common stock	(22	)	—			(1		)							(1		)
Share-based compensation						17			(1		)				16
Balance at Dec. 31, 2018	514,037		$	1,285		$	6,168		$	4,893		$	(124	)	$	12,222
See Notes to Consolidated Financial Statements

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XCEL ENERGY INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

1. Summary of Significant Accounting Policies

General — Xcel Energy Inc.’s utility subsidiaries are engaged in the regulated generation, purchase, transmission, distribution and sale of electricity and in the regulated purchase, transportation, distribution and sale of natural gas.

Xcel Energy’s regulated operations include the activities of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS. These utility subsidiaries serve electric and natural gas customers in portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. Also included in regulated operations are WGI, an interstate natural gas pipeline company, and WYCO, a joint venture with CIG to develop and lease natural gas pipeline, storage and compression facilities.

Xcel Energy Inc.’s nonregulated subsidiaries include Eloigne and Capital Services. Eloigne invests in rental housing projects that qualify for low-income housing tax credits. Capital Services procures equipment for construction of renewable generation facilities at other subsidiaries. Xcel Energy Inc. owns the following additional direct subsidiaries, some of which are intermediate holding companies with additional subsidiaries: Xcel Energy Wholesale Group Inc., Xcel Energy Markets Holdings Inc., Xcel Energy Ventures Inc., Xcel Energy Retail Holdings Inc., Xcel Energy Communications Group, Inc., Xcel Energy International Inc., Xcel Energy Transmission Holding Company, LLC, Nicollet Holdings Company, LLC, Nicollet Project Holdings LLC and Xcel Energy Services Inc. Xcel Energy Inc. and its subsidiaries collectively are referred to as Xcel Energy.

Xcel Energy’s consolidated financial statements include its wholly-owned subsidiaries and VIEs for which it is the primary beneficiary. All intercompany transactions and balances are eliminated, unless a different treatment is appropriate for rate regulated transactions.

Xcel Energy uses the equity method of accounting for its investment in WYCO. Xcel Energy’s equity earnings in WYCO are included on the consolidated statements of income as equity earnings of unconsolidated subsidiaries.

Xcel Energy has investments in certain plants and transmission facilities jointly owned with nonaffiliated utilities. Xcel Energy’s proportionate share of jointly owned facilities is recorded as property, plant and equipment on the consolidated balance sheets, and Xcel Energy’s proportionate share of the operating costs associated with these facilities is included in its consolidated statements of income. See Note 3 for further information.

Xcel Energy’s consolidated financial statements are presented in accordance with GAAP. All of the utility subsidiaries’ underlying accounting records also conform to the FERC uniform system of accounts.

Xcel Energy has evaluated events occurring after Dec. 31, 2018 up to the date of issuance of these consolidated financial statements. Statements contain all necessary adjustments and disclosures resulting from that evaluation.

Use of Estimates — Xcel Energy uses estimates based on the best information available in recording transactions and balances resulting from business operations. Estimates are used on items such as plant depreciable lives or potential disallowances, AROs, certain regulatory assets and liabilities, tax provisions, uncollectible amounts, environmental costs, unbilled revenues, jurisdictional fuel and energy cost allocations and actuarially determined benefit costs. Recorded estimates are revised when better information becomes available or actual amounts can be determined. Revisions can affect operating results.

Regulatory Accounting — Xcel Energy Inc.’s regulated utility subsidiaries account for income and expense items in accordance with accounting guidance for regulated operations. Under this guidance:

• Certain costs, which would otherwise be charged to expense or other comprehensive income, are deferred as regulatory assets based on the expected ability to recover the costs in future rates.

• Certain credits, which would otherwise be reflected as income or other comprehensive income, are deferred as regulatory liabilities based on the expectation the amounts will be returned to customers in future rates, or because the amounts were collected in rates prior to the costs being incurred.

Estimates of recovering deferred costs and returning deferred credits are based on specific ratemaking decisions or precedent for each item. Regulatory assets and liabilities are amortized consistent with the treatment in the rate setting process.

If changes in the regulatory environment occur, the utility subsidiaries may no longer be eligible to apply this accounting treatment, and may be required to eliminate regulatory assets and liabilities from their balance sheets. Such changes could have a material effect on Xcel Energy’s results of operations, financial condition or cash flows.

See Note 4 for further information.

Income Taxes — Xcel Energy accounts for income taxes using the asset and liability method, which requires deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Xcel Energy defers income taxes for all temporary differences between pretax financial and taxable income, and between the book and tax bases of assets and liabilities. Xcel Energy uses the tax rates that are scheduled to be in effect when the temporary differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in the period that includes the enactment date.

The effects of tax rate changes that are attributable to the utility subsidiaries are generally subject to a normalization method of accounting. Therefore, the revaluation of most of the utility subsidiaries’ net deferred taxes upon a tax rate reduction results in the establishment of a net regulatory liability which will be refundable to utility customers over the remaining life of the related assets. A tax rate increase would result in the establishment of a similar regulatory asset.

Reversal of certain temporary differences are accounted for as current income tax expense due to the effects of past regulatory practices when deferred taxes were not required to be recorded due to the use of flow through accounting for ratemaking purposes. Tax credits are recorded when earned unless there is a requirement to defer the benefit and amortize it over the book depreciable lives of the related property. The requirement to defer and amortize tax credits only applies to federal ITCs related to public utility property. Utility rate regulation also has resulted in the recognition of regulatory assets and liabilities related to income taxes.

Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax asset will not be realized.

Xcel Energy follows the applicable accounting guidance to measure and disclose uncertain tax positions that it has taken or expects to take in its income tax returns. Xcel Energy recognizes a tax position in its consolidated financial statements when it is more likely than not that the position will be sustained upon examination based on the technical merits of the position.

Recognition of changes in uncertain tax positions are reflected as a component of income tax.

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Xcel Energy reports interest and penalties related to income taxes within the other income and interest charges in the consolidated statements of income.

Xcel Energy Inc. and its subsidiaries file consolidated federal income tax returns as well as consolidated or separate state income tax returns. Federal income taxes paid by Xcel Energy Inc. are allocated to its subsidiaries based on separate company computations. A similar allocation is made for state income taxes paid by Xcel Energy Inc. in connection with consolidated state filings. Xcel Energy Inc. also allocates its own income tax benefits to its direct subsidiaries.

See Note 7 for further information.

Property, Plant and Equipment and Depreciation — Property, plant and equipment is stated at original cost. The cost of plant includes direct labor and materials, contracted work, overhead costs and AFUDC. The cost of plant retired is charged to accumulated depreciation and amortization. Amounts recovered in rates for future removal costs are recorded as regulatory liabilities. Significant additions or improvements extending asset lives are capitalized, while repairs and maintenance costs are charged to expense as incurred. Maintenance and replacement of items determined to be less than a unit of property are charged to operating expenses as incurred. Planned maintenance activities are charged to operating expense unless the cost represents the acquisition of an additional unit of property or the replacement of an existing unit of property.

Property, plant and equipment is tested for impairment when it is determined that the carrying value of the assets may not be recoverable. A loss is recognized in the current period if it becomes probable that part of a cost of a plant under construction or recently completed plant will be disallowed for recovery from customers and a reasonable estimate of the disallowance can be made. For investments in property, plant and equipment that are abandoned and not expected to go into service, incurred costs and related deferred tax amounts are compared to the discounted estimated future rate recovery, and a loss is recognized, if necessary.

Xcel Energy records depreciation expense using the straight-line method over the plant’s useful life. Actuarial life studies are performed and submitted to the state and federal commissions for review. Upon acceptance by the various commissions, the resulting lives and net salvage rates are used to calculate depreciation. Depreciation expense, expressed as a percentage of average depreciable property, was approximately 3.1% for 2018, 3.1% for 2017 and 2.9% for 2016.

See Note 3 for further information.

AROs—Xcel Energy Inc.’s utility subsidiaries account for AROs under accounting guidance that requires a liability for the fair value of an ARO to be recognized in the period in which it is incurred if it can be reasonably estimated, with the offsetting associated asset retirement costs capitalized as a long-lived asset. The liability is generally increased over time by applying the effective interest method of accretion, and the capitalized costs are depreciated over the useful life of the long-lived asset. Changes resulting from revisions to the timing or amount of expected asset retirement cash flows are recognized as an increase or a decrease in the ARO. Xcel Energy Inc.’s utility subsidiaries also recover through rates certain future plant removal costs in addition to AROs. The accumulated removal costs for these obligations are reflected in the balance sheets as a regulatory liability.

See Note 12 for further information.

Nuclear Decommissioning — Nuclear decommissioning studies that estimate NSP-Minnesota’s ultimate costs of decommissioning its nuclear power plants are performed at least every three years and submitted to the state commissions for approval.

For ratemaking purposes, NSP-Minnesota recovers the decommissioning costs of its nuclear power plants over each facility’s expected service life based on the triennial decommissioning studies. The studies consider estimated future costs of decommissioning and the market value of investments in trust funds, and recommend annual funding amounts. Amounts collected in rates are deposited in the trust funds. For financial reporting purposes, NSP-Minnesota accounts for nuclear decommissioning as an ARO.

Restricted funds for the payment of future decommissioning expenditures for NSP-Minnesota’s nuclear facilities are included in nuclear decommissioning fund and other assets on the consolidated balance sheets.

See Note 10 for further information.

Benefit Plans and Other Postretirement Benefits — Xcel Energy maintains pension and postretirement benefit plans for eligible employees. Recognizing the cost of providing benefits and measuring the projected benefit obligation of these plans requires management to make various assumptions and estimates.

Certain unrecognized actuarial gains and losses and unrecognized prior service costs or credits are deferred as regulatory assets and liabilities, rather than recorded as other comprehensive income, based on regulatory recovery mechanisms.

See Note 11 for further information.

Environmental Costs — Environmental costs are recorded when it is probable Xcel Energy is liable for remediation costs and the liability can be reasonably estimated. Costs are deferred as a regulatory asset if it is probable that the costs will be recovered from customers in future rates. Otherwise, the costs are expensed. If an environmental expense is related to facilities currently in use, such as emission-control equipment, the cost is capitalized and depreciated over the life of the plant.

Estimated remediation costs are regularly adjusted as estimates are revised and remediation proceeds. If other participating PRPs exist and acknowledge their potential involvement with a site, costs are estimated and recorded only for Xcel Energy’s expected share of the cost.

Future costs of restoring sites are treated as a capitalized cost of plant retirement. The depreciation expense levels recoverable in rates include a provision for removal expenses. Removal costs recovered in rates before the related costs are incurred are classified as a regulatory liability.

See Note 12 for further information.

Revenue From Contracts With Customers — Performance obligations related to the sale of energy are satisfied as energy is delivered to customers. Xcel Energy recognizes revenue that corresponds to the price of the energy delivered to the customer. The measurement of energy sales to customers is generally based on the reading of their meters, which occurs on a systematic basis throughout the month. At the end of each month, amounts of energy delivered to customers since the date of the last meter reading are estimated, and the corresponding unbilled revenue is recognized.

Xcel Energy does not recognize a separate financing component of its collections from customers as contract terms are short-term in nature. Xcel Energy presents its revenues net of any excise or sales taxes or fees.

Xcel Energy’s utility subsidiaries recognize sales to customers on a gross basis in electric revenues and cost of sales. Revenues and charges for short term wholesale sales of excess energy transacted through RTOs are also recorded on a gross basis. Other RTO revenues and charges are recorded on a net basis in cost of sales.

See Note 6 for further information.

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Cash and Cash Equivalents — Xcel Energy considers investments in instruments with a remaining maturity of three months or less at the time of purchase, to be cash equivalents.

Accounts Receivable and Allowance for Bad Debts — Accounts receivable are stated at the actual billed amount net of an allowance for bad debts. Xcel Energy establishes an allowance for uncollectible receivables based on a policy that reflects its expected exposure to the credit risk of customers. As of Dec. 31, 2018 and 2017, the allowance for bad debts was $55 million and $52 million, respectively.

Inventory — Inventory is recorded at average cost and consisted of the following:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Inventories
Materials and supplies	$	271	$	311
Fuel	170		186
Natural gas	107		113
	$	548	$	610

Fair Value Measurements — Xcel Energy presents cash equivalents, interest rate derivatives, commodity derivatives and nuclear decommissioning fund assets at estimated fair values in its consolidated financial statements. Cash equivalents are recorded at cost plus accrued interest; money market funds are measured using quoted NAVs. For interest rate derivatives, quoted prices based primarily on observable market interest rate curves are used to establish fair value. For commodity derivatives, the most observable inputs available are generally used to determine the fair value of each contract. In the absence of a quoted price, Xcel Energy may use quoted prices for similar contracts or internally prepared valuation models to determine fair value.

For the pension and postretirement plan assets and nuclear decommissioning fund, published trading data and pricing models, generally using the most observable inputs available, are utilized to estimate fair value for each security.

See Notes 10 and 11 for further information.

Derivative Instruments — Xcel Energy uses derivative instruments in connection with its interest rate, utility commodity price, vehicle fuel price and commodity trading activities, including forward contracts, futures, swaps and options. Any derivative instruments not qualifying for the normal purchases and normal sales exception are recorded on the consolidated balance sheets at fair value as derivative instruments. Classification of changes in fair value for those derivative instruments is dependent on the designation of a qualifying hedging relationship. Changes in fair value of derivative instruments not designated in a qualifying hedging relationship are reflected in current earnings or as a regulatory asset or liability. Classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms.

Gains or losses on commodity trading transactions are recorded as a component of electric operating revenues; hedging transactions for vehicle fuel costs are recorded as a component of capital projects and O&M costs; and interest rate hedging transactions are recorded as a component of interest expense.

Normal Purchases and Normal Sales — Xcel Energy enters into contracts for purchases and sales of commodities for use in its operations. At inception, contracts are evaluated to determine whether a derivative exists and/or whether an instrument may be exempted from derivative accounting if designated as a normal purchase or normal sale.

See Note 10 for further information.

Commodity Trading Operations — All applicable gains and losses related to commodity trading activities are shown on a net basis in electric operating revenues in the consolidated statements of income.

Commodity trading activities are not associated with energy produced from Xcel Energy’s generation assets or energy and capacity purchased to serve native load. Commodity trading contracts are recorded at fair market value and commodity trading results include the impact of all margin-sharing mechanisms.

See Note 10 for further information.

Other Utility Items

AFUDC — AFUDC represents the cost of capital used to finance utility construction activity. AFUDC is computed by applying a composite financing rate to qualified CWIP. The amount of AFUDC capitalized as a utility construction cost is credited to other nonoperating income (for equity capital) and interest charges (for debt capital). AFUDC amounts capitalized are included in Xcel Energy’s rate base for establishing utility rates.

Alternative Revenue — Certain rate rider mechanisms (including decoupling and CIP/DSM programs) qualify as alternative revenue programs under GAAP. These mechanisms arise from costs imposed upon the utility by action of a regulator or legislative body related to an environmental, public safety or other mandate. When certain criteria are met, such as collection within 24 months, revenue is recognized equal to the revenue requirement, which may include incentives and return on rate base items. Billing amounts are revised periodically for differences between total amount collected and revenue earned, which may increase or decrease the level of revenue collected from customers. Alternative revenues arising from these programs are presented on a gross basis and disclosed separately from revenue from contracts with customers.

See Note 6 for further information.

Conservation Programs —Costs incurred for DSM and CIP programs are deferred if it is probable future revenue will recover the incurred cost. Revenues recognized for incentive programs for the recovery of lost margins and/or conservation performance incentives are limited to amounts expected to be collected within 24 months from when they are earned. Regulatory assets are recognized to reflect the amount of costs or earned incentives that have not yet been collected from customers.

Emission Allowances — Emission allowances are recorded at cost plus broker commission fees. The inventory accounting model is utilized for all emission allowances and sales of these allowances are included in electric revenues.

Nuclear Refueling Outage Costs — Xcel Energy uses a deferral and amortization method for nuclear refueling costs. This method amortizes refueling outage costs over the period between refueling outages consistent with rate recovery.

RECs — Cost of RECs that are utilized for compliance is recorded as electric fuel and purchased power expense. In certain jurisdictions, Xcel Energy reduces recoverable fuel costs for the cost of RECs and records that cost as a regulatory asset when the amount is recoverable in future rates.

Sales of RECs are recorded in electric revenues on a gross basis. The cost of these RECs and amounts credited to customers under margin-sharing mechanisms are recorded in electric fuel and purchased power expense.

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2.    Accounting Pronouncements

Recently Issued

Leases —In 2016, the FASB issued Leases, Topic 842 (ASU No. 2016-02), which requires balance sheet recognition of right-of-useassets and lease liabilities for most leases. Adoptionwill occur on Jan. 1, 2019 utilizing the package of transition practical expedients provided by the new standard, including carrying forward prior conclusions of whether agreements existing before the adoption date contain leases, and whether existing leases are operating or capital/finance leases. Xcel Energy expects to utilize other expedients offered by the new standard and Leases, Topic 842 (ASU No. 2018-11), including elections to not recognize short term leases on the consolidated balance sheet for certain classes of assets and to implement the standard on a prospective basis. Xcel Energy’s implementation of the new guidance is substantially complete, and is expected to result in the recognition of approximately $2 billion of right-of-use assets and lease liabilities in the first quarter of 2019 for operating leases for the use of real estate, equipment and certain natural gas generating facilities operated under PPAs. The implementation is not expected to have a significant impact on Xcel Energy’s consolidated financial statements, other than first-time recognition of these operating leases on the consolidated balance sheet.

Recently Adopted

Revenue Recognition —In 2014, the FASB issued Revenue from Contracts with Customers, Topic 606 (ASU No. 2014-09), which provides a new framework for the recognition of revenue. Xcel Energy implemented the guidance on a modified retrospective basis on Jan. 1, 2018. Results for reporting periods beginning after Dec. 31, 2017 are presented in accordance with Topic 606, while prior period results have not been adjusted and continue to be reported in accordance with prior accounting guidance. The implementation did not have a material impact on Xcel Energy’s consolidated financial statements, other than increased disclosures regarding revenues related to contracts with customers.

Classification and Measurement of Financial Instruments —In 2016, the FASB issued Recognition and Measurement of Financial Assets and Financial Liabilities, Subtopic 825-10 (ASU No. 2016-01), which eliminated the available-for-sale classification for marketable equity securities and also replaced the cost method of accounting for non-marketable equity securities with a model for recognizing impairments and observable price changes. Xcel Energy implemented the guidance on Jan. 1, 2018 and the adoption impacts were not material.

Presentation of Net Periodic Benefit Cost —In 2017, the FASB issued Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, Topic 715 (ASU No. 2017-07), which establishes that only the service cost portion of pension cost may be presented as a component of operating income. In addition, only the service cost portion of pension cost is eligible for capitalization. As a result of regulatory accounting treatment, a similar amount of pension cost, including non-service components, will be recognized consistent with historical ratemaking and the impacts of adoption are limited to changes in classification of non-service costs in the consolidated statements of income.

Xcel Energy implemented the new guidance on Jan. 1, 2018. As a result, $33 million and $26 million of pension costs were retrospectively reclassified from operating and maintenance expenses to other expense, net on the consolidated statements of income for 2017 and 2016, respectively. Xcel Energy used benefit cost amounts disclosed for prior periods as the basis for retrospective application.

3. Property, Plant and Equipment

Major classes of property, plant and equipment:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
Property, plant and equipment
Electric plant	$	41,472		$	39,016
Natural gas plant	6,210			5,800
Common and other property	2,154			2,013
Plant to be retired (a)	322			11
CWIP	2,091			2,087
Total property, plant and equipment	52,249			48,927
Less accumulated depreciation	(15,659		)	(15,000		)
Nuclear fuel	2,771			2,697
Less accumulated amortization	(2,417		)	(2,295		)
	$	36,944		$	34,329

^(a)  In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early in 2025.  Amounts are presented net of accumulated depreciation.

Joint Ownership of Generation, Transmission and Gas Facilities

The utility subsidiaries’ jointly owned assets as of Dec. 31, 2018:

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Minnesota
Electric Generation:
Sherco Unit 3	$	604	$	415	$	1	59	%
Sherco Common Facilities	145		100		1		80
Other	5		4		—		59
Electric Transmission:
CapX2020 Transmission	960		73		2		51
Other	11		2		—		50
Total NSP-Minnesota	$	1,725	$	594	$	4

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Wisconsin
Electric Transmission:
La Crosse, WI to Madison, WI	$	175	$	2	$	—	37	%
CapX2020 Transmission	169		15		2		81
Total NSP-Wisconsin	$	344	$	17	$	2

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
PSCo
Electric Generation:
Hayden Unit 1	$	153	$	76	$	—	76	%
Hayden Unit 2	149		68		—		37
Hayden Common Facilities	41		21		—		53
Craig Units 1 and 2	81		40		—		10
Craig Common Facilities	39		21		—		7
Comanche Unit 3	886		130		—		67
Comanche Common Facilities	28		3		—		82
Electric Transmission:
Transmission and other facilities	183		63		1		Various
Gas Transportation:
Rifle, CO to Avon, CO	22		7		—		60
Gas Transportation Compressor	8		1		—		50
Total PSCo	$	1,590	$	430	$	1

Each company’s share of operating expenses and construction expenditures are included in the applicable utility accounts. Respective owners are responsible for providing their own financing.

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4. Regulatory Assets and Liabilities

Regulatory assets and liabilities are created for amounts that regulators may allow to be collected, or may require to be paid back to customers in future electric and natural gas rates. Xcel Energy would be required to recognize the write-off of regulatory assets and liabilities in net income or other comprehensive income if changes in the utility industry no longer allow for the application of regulatory accounting guidance under GAAP.

Components of regulatory assets:

(Millions of Dollars)	See Note(s)	Remaining Amortization Period	Dec. 31, 2018				Dec. 31, 2017
Regulatory Assets			Current		Non- current		Current		Non- current
Pension and retiree medical obligations	11	Various	$	87	$	1,500	$	91	$	1,499
Net AROs (a)	1, 12	Plant lives	—		452		—		301
Excess deferred taxes - TCJA	7	Various	—		296		—		254
Recoverable deferred taxes on AFUDC recorded in plant		Plant lives	—		264		—		244
Environmental remediation costs	1, 12	Various	17		155		16		165
Depreciation differences		One to thirteen years	18		107		20		69
Benson biomass PPA termination and asset purchase		Ten years	10		86		—		—
Contract valuation adjustments (b)	1, 10	Term of related contract	17		77		21		93
Laurentian biomass PPA termination		Five years	18		73		—		—
Purchased power contract costs		Term of related contract	4		63		3		67
PI EPU		Sixteen years	3		56		3		58
Losses on reacquired debt		Term of related debt	4		44		5		48
State commission adjustments		Plant lives	1		29		1		29
Conservation programs (c)	1	One to two years	42		28		50		32
Property tax		Various	14		10		8		24
Nuclear refueling outage costs	1	One to two years	37		14		49		20
Deferred purchased natural gas and electric energy costs		One to three years	57		13		21		13
Renewable resources and environmental initiatives		One to two years	39		9		48		10
Sales true up and revenue decoupling		One to two years	38		7		37		12
Gas pipeline inspection and remediation costs		One to two years	28		3		24		12
Other		Various	30		40		27		55
Total regulatory assets			$	464	$	3,326	$	424	$	3,005

^(a) Includes amounts recorded for future recovery of AROs, less amounts recovered through nuclear decommissioning accruals and gains from decommissioning investments.

^(b) Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

^(c) Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

Components of regulatory liabilities:

(Millions of Dollars)	See Note(s)	Remaining Amortization Period	Dec. 31, 2018				Dec. 31, 2017
Regulatory Liabilities			Current		Non- current		Current		Non- current
Deferred income tax adjustments and TCJA refunds (a)	7	Various	$	157	$	3,715	$	—	$	3,790
Plant removal costs	1, 12	Plant lives	—		1,175		—		1,131
Effects of regulation on employee benefit costs (b)		Various	—		137		—		46
Renewable resources and environmental initiatives		Various	9		54		19		60
ITC deferrals (c)	1	Various	—		40		—		23
Deferred electric, natural gas and steam production costs		Less than one year	102		—		104		—
Contract valuation adjustments (d)	1, 10	Less than one year	26		—		30		—
Conservation programs (e)	1	Less than one year	36		—		23		—
DOE settlement		Less than one year	19		—		18		—
Other		Various	87		66		45		33
Total regulatory liabilities (f)			$	436	$	5,187	$	239	$	5,083

^(a)  Includes the revaluation of recoverable/regulated plant ADIT and revaluation impact of non-plant ADIT due to the TCJA.

^(b)  Includes regulatory amortization and certain TCJA benefits approved by the CPUC to offset the PSCo prepaid pension asset at Dec. 31, 2018.

^(c)  Includes impact of lower federal tax rate due to the TCJA.

^(d)  Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

^(e)  Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

^(f)  Revenue subject to refund of $29 million and $15 million for 2018 and 2017, respectively, is included in other current liabilities.

At Dec. 31, 2018 and 2017, Xcel Energy’s regulatory assets not earning a return primarily included the unfunded portion of pension and retiree medical obligations, net AROs and Laurentian biomass PPA termination costs/obligations. In addition, regulatory assets included $178 million and $212 million at Dec. 31, 2018 and 2017, respectively, of past expenditures not earning a return. Amounts largely related to purchased natural gas and electric energy costs, various renewable resources and certain environmental initiatives.

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5. Borrowings and Other Financing Instruments

Short-Term Borrowings

Short-Term Debt — Xcel Energy Inc. and its utility subsidiaries meet their short-term liquidity requirements primarily through the issuance of commercial paper, term loan borrowings and letters of credit under their credit facilities.

Short-term debt borrowings outstanding for Xcel Energy were as follows:

	Three Months Ended Dec. 31, 2018			Year Ended Dec. 31
(Amounts in Millions, Except Interest Rates)				2018			2017			2016
Borrowing limit	$	3,250		$	3,250		$	3,250		$	2,750
Amount outstanding at period end	1,038			1,038			814			392
Average amount outstanding	500			788			644			485
Maximum amount outstanding	1,038			1,349			1,247			1,183
Weighted average interest rate, computed on a daily basis	2.76		%	2.34		%	1.35		%	0.74		%
Weighted average interest rate at end of period	2.97			2.97			1.90			0.95

Term Loan Agreement —In December 2018, Xcel Energy Inc. renewed its $500 million364-Day Term Loan Agreement with $250 million outstanding. In February 2019, Xcel Energy borrowed the remaining amount. No additional capacity remains as loans borrowed and repaid may not be redrawn. The loan is unsecured and matures Dec. 3, 2019. Xcel Energy has an option to request an extension through Dec. 2, 2020. Term loan includes one financial covenant, requiring Xcel Energy’s consolidated funded debt to total capitalization ratio to be less than or equal to 65 percent. Interest is at a rate equal to either (i) the Eurodollar rate, plus 50.0 basis points, or (ii) an alternate base rate. Xcel Energy is also required to pay a commitment fee equal to 10 basis points per annum on the unborrowed portion.

Letters of Credit— Xcel Energy Inc. and its subsidiaries use letters of credit, typically with terms of one year, to provide financial guarantees for certain operating obligations. As of Dec. 31, 2018 and 2017, there were $49 million and $30 million of letters of credit outstanding. Amounts approximate their fair value.

Credit Facilities — Xcel Energy Inc. and its utility subsidiaries must have revolving credit facilities in place at least equal to the amount of their commercial paper borrowing limits and cannot issue commercial paper exceeding available capacity under these credit facilities. The lines of credit provide short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

Features of the credit facilities:

	Debt-to-Total Capitalization Ratio(a)				Amount Facility May Be Increased (millions)		Additional Periods For Which a One-Year Extension May Be Requested (b)
	2018		2017
Xcel Energy Inc. (c)	58	%	58	%	$	200	2
NSP-Wisconsin	48		47		N/A		1
NSP-Minnesota	48		48		100		2
SPS	46		46		50		2
PSCo	46		44		100		2

^(a)  Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.

^(b)  All extension requests are subject to majority bank group approval.

^(c) The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. will be in default on its borrowings under the facility if it or any of its subsidiaries (except NSP-Wisconsin as long as its total assets do not comprise more than 15% of Xcel Energy’s consolidated total assets) default on indebtedness in an aggregate principal amount exceeding $75 million.

If Xcel Energy Inc. or its utility subsidiaries do not comply with the covenant, an event of default may be declared, and if not remedied, any outstanding amounts due under the facility can be declared due by the lender. As of Dec. 31, 2018, Xcel Energy Inc. and its subsidiaries were in compliance with all financial covenants.

Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available as of Dec. 31, 2018:

(Millions of Dollars)	Credit Facility (a)		Drawn (b)		Available
Xcel Energy Inc.	$	1,500	$	488	$	1,012
PSCo	700		317		383
NSP-Minnesota	500		187		313
SPS	400		44		356
NSP-Wisconsin	150		51		99
Total	$	3,250	$	1,087	$	2,163

^(a)  These credit facilities mature in June 2021, with the exception of Xcel Energy’s Inc.’s 364-day term loan agreement which expires in December 2019.

^(b)  Includes outstanding commercial paper, term loan borrowings and letters of credit.

All credit facility bank borrowings, outstanding letters of credit, term loan borrowings and outstanding commercial paper reduce the available capacity under the credit facilities. Xcel Energy Inc. and its subsidiaries had no direct advances on facilities outstanding as of Dec. 31, 2018 and 2017.

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Long-Term Borrowings and Other Financing Instruments

Generally, all property of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS are subject to the liens of their first mortgage indentures. Debt premiums, discounts and expenses are amortized over the life of the related debt. The premiums, discounts and expenses for refinanced debt are deferred and amortized over the life of the new issuance.

Long term debt obligations for Xcel Energy Inc. and its utility subsidiaries as of Dec. 31:

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
Xcel Energy Inc.
Unsecured senior notes	2020 - 2041	2.40% - 6.50%	1.20% - 6.50%	$	3,400		$	2,900
Elimination of PSCo capital lease obligation with affiliates				(60		)	(62		)
Unamortized discount				(5		)	(2		)
Unamortized debt issuance cost				(21		)	(20		)
Current maturities (Capital lease obligation)				2			2
Total				$	3,316		$	2,818

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
NSP-Minnesota
Mortgage bonds	2020 - 2047	2.15% - 7.13%	2.15% - 7.13%	$	5,000		$	5,000
Unamortized discount				(21		)	(22		)
Unamortized debt issuance cost				(42		)	(45		)
Current maturities				—			—
Total				$	4,937		$	4,933

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
NSP-Wisconsin
Mortgage bonds	2024 - 2048	3.3% - 6.38%	3.3% - 6.38%	$	800		$	750
City of La Crosse resource recovery bond	2021	6.00%	6.00%	19			19
Other				—			2
Unamortized discount				(3		)	(3		)
Unamortized debt issuance cost				(9		)	(7		)
Current maturities				—			(151		)
Total				$	807		$	610

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
PSCo
Capital lease obligations	2025 - 2060	11.20% - 14.30%	11.20% - 14.30%	$	145		$	151
Mortgage bonds	2019 - 2048	2.25% - 6.50%	2.25% - 6.50%	4,900			4,500
Unamortized discount				(14		)	(13		)
Unamortized debt issuance cost				(33		)	(29		)
Current maturities				(406		)	(306		)
Total				$	4,592		$	4,303

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
SPS
Mortgage bonds	2024 - 2048	3.30% - 4.50%	3.30% - 4.50%	$	1,800		$	1,500
Unsecured senior notes	2033 - 2036	6.00%	6.00% - 8.75%	350			350
Unamortized discount				(4		)	(2		)
Unamortized debt issuance cost				(20		)	(18		)
Current maturities				—			—
Total				$	2,126		$	1,830

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
Other Subsidiaries
Various Eloigne Co. affordable housing project notes	2019 - 2052	0.00% - 6.90%	0.00% - 7.05%	$	26		$	28
Current maturities				(1		)	(2		)
Total				$	25		$	26

57

Maturities of long-term debt:

(Millions of Dollars)
2019	$	406
2020	1,257
2021	425
2022	902
2023	653

2018 financings:

	Amount	Financing Instrument	Interest Rate		Maturity Date
Xcel Energy Inc.	$500 million	Senior Notes	4.00	%	June 15, 2028
PSCo	350 million	First mortgage bonds	3.70		June 15, 2028
PSCo	350 million	First mortgage bonds	4.10		June 15, 2048
NSP-Wisconsin	200 million	First mortgage bonds	4.20		Sept. 1, 2048
SPS	300 million	First mortgage bonds	4.40		Nov 15, 2048

2017 financings:

	Amount	Financing Instrument	Interest Rate		Maturity Date
PSCo	$400 million	First mortgage bonds	3.80	%	June 15, 2047
SPS	450 million	First mortgage bonds	3.70		Aug. 15, 2047
NSP-Minnesota	600 million	First mortgage bonds	3.60		Sept. 15, 2047
NSP-Wisconsin	100 million	First mortgage bonds	3.75		Dec. 1, 2047

Forward Equity Agreements —In November 2018, Xcel Energy Inc. entered into forward sale agreements in connection with a completed $459 million public offering of 9.4 million shares of Xcel Energy common stock. The initial forward agreement was for 8.1 million shares with an additional agreement of 1.2 million shares exercised at the option of the banking counterparty. At Dec. 31, 2018, the forward agreements could have been settled with physical delivery of 9.4 million common shares to the banking counterparty in exchange for cash of $456 million. The forward instruments could also have been settled at Dec. 31, 2018 with delivery of approximately $24 million of cash or approximately 0.5 million shares of common stock to the counterparty, if Xcel Energy unilaterally elected net cash or net share settlement, respectively. The forward price used to determine amounts due at settlement is calculated based on the November 2018 public offering price for Xcel Energy’s common stock of $49.00, increased for the overnight bank funding rate, less a spread of 0.75% and less expected dividends on Xcel Energy’s common stock during the period the instruments are outstanding.

Xcel Energy may settle the agreements at any time up to the maturity date of February 7, 2020. Depending on settlement timing, cash proceeds are expected to be approximately $450 million to $460 million.

Forward equity instruments were recognized within stockholders’ equity at fair value at execution of the agreements, and will not be subsequently adjusted until settlement.

ATM Equity Offering— Xcel Energy issued 4.7 million shares of common stock with net proceeds of $224.7 million through the at-the-market program. In addition, transaction fees of $1.9 million were paid. In November 2018, the ATM offering was closed.

Other Equity —Xcel Energy issued $38.5 million and $39.2 million of equity through the DRIP program during the years ended Dec. 31, 2018 and 2017 respectively. Program allows stockholders to elect dividend reinvestment in Xcel Energy common stock through a non-cash transaction. See Note 8 for equity items related to share based compensation.

Deferred Financing Costs — Deferred financing costs of approximately $126 million and $119 million, net of amortization, are presented as a deduction from the carrying amount of long-term debt as of Dec. 31, 2018 and 2017, respectively.

Capital Stock — Preferred stock authorized/outstanding:

	Preferred Stock Authorized (Shares)	Par Value of Preferred Stock		Preferred Stock Outstanding (Shares) 2018 and 2017
Xcel Energy Inc.	7,000,000	$	100	—
PSCo	10,000,000	0.01		—
SPS	10,000,000	1.00		—

Xcel Energy Inc. had the following common stock authorized/outstanding:

Commons Stock Authorized (Shares)		Par Value of Common Stock		Common Stock Outstanding (Shares)2018	Common Stock Outstanding (Shares) 2017
1	billion	$	2.50	514,036,787	507,762,881

Dividend and Other Capital-Related Restrictions — Xcel Energy depends on its subsidiaries to pay dividends. Xcel Energy Inc.’s utility subsidiaries’ dividends are subject to the FERC’s jurisdiction, which prohibits the payment of dividends out of capital accounts. Dividends are solely to be paid from retained earnings. Certain covenants also require Xcel Energy Inc. to be current on interest payments prior to dividend disbursements.

State regulatory commissions impose dividend limitations for NSP-Minnesota, NSP-Wisconsin and SPS.

Requirements and actuals as of Dec. 31, 2018:

	Equity to Total Capitalization Ratio Required Range				Equity to Total Capitalization Ratio Actual
	Low		High		2018
NSP-Minnesota	47.1	%	57.5	%	52.3	%
NSP-Wisconsin	51.5		N/A		51.8
SPS (a)	45.0		55.0		54.4

^(a)  SPS excludes short-term debt.

	Unrestricted Retained Earnings			Total Capitalization			Limit on Total Capitalization
NSP-Minnesota	$	1.0	billion	$	10.7	billion	$	11.5	billion
NSP-Wisconsin (a)	11.5		million	1.7		billion	N/A
SPS (b)	605.7		million	4.7		billion	N/A

^(a)  NSP-Wisconsin cannot pay annual dividends in excess of approximately $55 million if its average equity-to-total capitalization ratio falls below the commission authorized level.

^(b)  SPS may not pay a dividend that would cause it to lose its investment grade bond rating.

Issuance of securities by Xcel Energy Inc. generally is not subject to regulatory approval. However, utility financings and intra-system financings are subject to the jurisdiction of state regulatory commissions and/or the FERC. Xcel Energy may seek additional authorization as necessary.

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Authorizations as of Dec. 31, 2018:

	Amount Authorized to Issue
	Long-Term Debt				Short-Term Debt
NSP-Minnesota	52.93% of total capitalization			(a)	$	1.725	billion	(a)
NSP-Wisconsin	$	—		(b)	150		million
SPS	—			(b)	600		million
PSCo	1.1		billion		800		million

^(a)  NSP-Minnesota has authorization to issue long-term securities provided the equity-to-total capitalization remains within the required range, and to issue short-term debt provided it does not exceed 15% of total capitalization.

^(b)  SPS and NSP-Wisconsin will file for additional long-term debt authorization.

6. Revenues

Revenue is classified by the type of goods/services rendered and market/customer type. Xcel Energy’s operating revenues (subsequent to adoption of the revised revenue guidance) consists of the following:

	Year Ended Dec. 31, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	2,919	$	988	$	38	$	3,945
C&I	4,874		524		25		5,423
Other	134		—		6		140
Total retail	7,927		1,512		69		9,508
Wholesale	791		—		—		791
Transmission	523		—		—		523
Other	98		100		—		198
Total revenue from contracts with customers	9,339		1,612		69		11,020
Alternative revenue and other	380		127		10		517
Total revenues	$	9,719	$	1,739	$	79	$	11,537

7. Income Taxes

Federal Tax Reform— In 2017, the TCJA was signed into law. The key provisions impacting Xcel Energy, generally beginning in 2018, include:

• Corporate federal tax rate reduction from 35% to 21%;

• Normalization of resulting plant-related excess deferred taxes;

• Elimination of the corporate alternative minimum tax;

• Continued interest expense deductibility and discontinued bonus depreciation for regulated public utilities;

• Limitations on certain executive compensation deductions;

• Limitations on certain deductions for NOLs arising after Dec. 31, 2017 (limited to 80% of taxable income);

• Repeal of the section 199 manufacturing deduction; and

• Reduced deductions for meals and entertainment as well as state and local lobbying.

Xcel Energy estimated the effects of the TCJA, which have been reflected in the consolidated financial statements.

Reductions in deferred tax assets and liabilities due to a decrease in corporate federal tax rates typically result in a net tax benefit. However, the impacts are primarily recognized as regulatory liabilities refundable to utility customers as a result of IRS requirements and past regulatory treatment.

Estimated impacts of the new tax law in December 2017 included:

• $2.7 billion ($3.8 billion grossed-up for tax) of reclassifications of plant-related excess deferred taxes to regulatory liabilities upon valuation at the new 21% federal rate. The regulatory liabilities will be amortized consistent with IRS normalization requirements, resulting in customer refunds over an estimated weighted average period of approximately 30 years;

• $254 million and $174 million of reclassifications (grossed-up for tax) of excess deferred taxes for non-plant related deferred tax assets and liabilities, respectively, to regulatory assets and liabilities; and,

• $23 million of total estimated income tax expense related to the tax rate change on certain non-plant deferred taxes and all other 2017 income statement impacts of the federal tax reform.

Xcel Energy accounted for the state tax impacts of federal tax reform based on enacted state tax laws. Any future state tax law changes related to the TCJA will be accounted for in the periods state laws are enacted.

Federal Tax Loss Carryback Claims — In 2012 - 2015, Xcel Energy identified certain expenses related to 2009, 2010, 2011, 2013, 2014 and 2015 that qualify for an extended carryback beyond the typical two-year carryback period. As a result of a higher tax rate in prior years, Xcel Energy recognized a tax benefit of approximately $5 million in 2015, $17 million in 2014, $12 million in 2013 and $15 million in 2012.

Federal Audit— Statute of limitations applicable to Xcel Energy’s consolidated federal income tax returns expire as follows:

Tax Year(s)	Expiration
2009 - 2014	October 2019
2015	September 2019
2016	September 2020
2017	September 2021

In 2012, the IRS commenced an examination of tax years 2010 and 2011, including the 2009 carryback claim. In 2017, Xcel Energy and the Office of Appeals reached an agreement and the benefit related to the agreed upon portions was recognized. In the second quarter of 2018, the Joint Committee on Taxation completed its review and took no exception to the agreement. As a result, the remaining unrecognized tax benefit was released and recorded as a payable to the IRS.

In the third quarter of 2015, the IRS commenced an examination of tax years 2012 and 2013. In the third quarter of 2017, the IRS concluded the audit of tax years 2012 and 2013 and proposed an adjustment that would impact Xcel Energy’s NOL and ETR. Xcel Energy filed a protest with the IRS. As of Dec. 31, 2018, the case has been forwarded to the Office of Appeals and Xcel Energy has recognized its best estimate of income tax expense that will result from a final resolution of this issue; however, the outcome and timing of a resolution is unknown.

In the fourth quarter of 2018, the IRS began an audit of tax years 2014 - 2016, however no adjustments have been proposed.

State Audits— Xcel Energy files consolidated state tax returns based on income in its major operating jurisdictions and various other state income-based tax returns.

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As of Dec. 31, 2018, Xcel Energy’s earliest open tax years (subject to examination by state taxing authorities in its major operating jurisdictions) were as follows:

State	Year
Colorado	2009
Minnesota	2009
Texas	2010
Wisconsin	2014

• In the fourth quarter of 2018, the Minnesota audit of tax years 2010 - 2014 concluded with no material adjustments.

• In the third quarter of 2018, the Wisconsin audit of tax years 2012 - 2013 concluded with no material adjustments. In the fourth quarter of 2018, Wisconsin began an audit of tax years 2014 - 2016. No material adjustments have been proposed.

• No other state income tax audits were in progress as of Dec. 31, 2018.

Unrecognized Tax Benefits — Unrecognized tax benefit balance includes permanent tax positions, which if recognized would affect the annual ETR. In addition, the unrecognized tax benefit balance includes temporary tax positions for which the ultimate deductibility is highly certain, but for which there is uncertainty about the timing of such deductibility. A change in the period of deductibility would not affect the ETR but would accelerate the payment to the taxing authority to an earlier period.

Unrecognized tax benefits - permanent vs. temporary:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Unrecognized tax benefit — Permanent tax positions	$	28	$	20
Unrecognized tax benefit — Temporary tax positions	9		19
Total unrecognized tax benefit	$	37	$	39

Changes in unrecognized tax benefits:

(Millions of Dollars)	2018			2017			2016
Balance at Jan. 1	$	39		$	134		$	121
Additions based on tax positions related to the current year	9			6			8
Reductions based on tax positions related to the current year	(4		)	(4		)	—
Additions for tax positions of prior years	2			15			10
Reductions for tax positions of prior years	(4		)	(105		)	(5		)
Settlements with taxing authorities	(5		)	(7		)	—
Balance at Dec. 31	$	37		$	39		$	134

Unrecognized tax benefits were reduced by tax benefits associated with NOL and tax credit carryforwards:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
NOL and tax credit carryforwards	$	(35	)	$	(31	)

Net deferred tax liability associated with the unrecognized tax benefit amounts and related NOLs and tax credits carryforwards were $24 million and $13 million at Dec. 31, 2018 and Dec 31, 2017, respectively.

As the IRS Appeals and federal and state audits progress and other state audits resume, it is reasonably possible that the amount of unrecognized tax benefit could decrease up to approximately $28 million in the next 12 months.

Payable for interest related to unrecognized tax benefits is partially offset by the interest benefit associated with NOL and tax credit carryforwards.

Interest payable related to unrecognized tax benefits:

(Millions of Dollars)	2018		2017			2016
Payable for interest related to unrecognized tax benefits at Jan. 1	$	—	$	(3	)	$	—
Interest income (expense) related to unrecognized tax benefits	—		3			(3		)
Payable for interest related to unrecognized tax benefits at Dec. 31	$	—	$	—		$	(3	)

No amounts were accrued for penalties related to unrecognized tax benefits as of Dec. 31, 2018, 2017 or 2016.

Other Income Tax Matters — NOL amounts represent the tax loss that is carried forward and tax credits represent the deferred tax asset. NOL and tax credit carryforwards as of Dec. 31 were as follows:

(Millions of Dollars)	2018			2017
Federal NOL carryforward	$	—		$	1,072
Federal tax credit carryforwards	553			517
Valuation allowances for federal credit carryforwards	(5		)	(5		)
State NOL carryforwards	1,104			1,592
Valuation allowances for state NOL carryforwards	(50		)	(55		)
State tax credit carryforwards, net of federal detriment (a)	89			90
Valuation allowances for state credit carryforwards, net of federal benefit (b)	(69		)	(68		)

^(a)  State tax credit carryforwards are net of federal detriment of $24 million as of Dec. 31, 2018 and 2017.

^(b)  Valuation allowances for state tax credit carryforwards were net of federal benefit of $18 million as of Dec. 31, 2018 and 2017.

Federal carryforward periods expire between 2021 and 2038 and state carryforward periods expire between 2019 and 2037.

Total income tax expense from operations differs from the amount computed by applying the statutory federal income tax rate to income before income tax expense.

Effective income tax rate for years ended Dec. 31:

	2018		2017 (a)		2016 (a)
Federal statutory rate	21.0	%	35.0	%	35.0	%
State income tax on pretax income, net of federal tax effect	5.0		4.1		4.1
Increases (decreases) in tax from:
Regulatory differences - ARAM (b)	(5.8	)	(0.1	)	(0.1	)
Wind production tax credits recognized	(5.2	)	(4.7	)	(3.4	)
Other tax credits recognized, net of federal income tax expense	(2.0	)	(1.0	)	(0.8	)
Regulatory differences - other utility plant items	(1.0	)	(0.7	)	(0.5	)
Regulatory differences - Deferral of ARAM (c)	0.6		—		—
Change in unrecognized tax benefits	0.4		(0.6	)	0.2
Tax reform	—		1.4		—
Other, net	(0.4	)	(1.3	)	(0.4	)
Effective income tax rate	12.6	%	32.1	%	34.1	%

^(a)  Prior periods have been reclassified to conform to current year presentation.

^(b)  ARAM is a method to flow back excess deferred taxes to customers.

^(c)  ARAM has been deferred when regulatory treatment has not been established. As Xcel Energy received direction from its regulatory commissions regarding the return of excess deferred taxes to customers, the ARAM deferral was reversed. This resulted in a reduction to tax expense with a corresponding reduction to revenue.

60

Components of income tax expense for years ended Dec. 31:

(Millions of Dollars)	2018			2017			2016
Current federal tax (benefit) expense	$	(34	)	$	1		$	(3	)
Current state tax expense (benefit)	8			(11		)	(4		)
Current change in unrecognized tax (benefit) expense	(6		)	(83		)	6
Deferred federal tax expense	122			460			477
Deferred state tax expense	85			107			112
Deferred change in unrecognized tax expense (benefit)	11			73			(2		)
Deferred investment tax credits	(5		)	(5		)	(5		)
Total income tax expense	$	181		$	542		$	581

Components of deferred income tax expense as of Dec. 31:

(Millions of Dollars)	2018			2017			2016
Deferred tax expense (benefit) excluding items below	$	320		$	(2,939	)	$	631
Amortization and adjustments to deferred income taxes on income tax regulatory assets and liabilities	(102		)	3,583			(45		)
Tax (expense) benefit allocated to other comprehensive income, net of adoption of ASU No. 2018-02, and other	—			(4		)	1
Deferred tax expense	$	218		$	640		$	587

Components of net deferred tax liability as of Dec. 31:

(Millions of Dollars)	2018			2017
Deferred tax liabilities:
Differences between book and tax bases of property	$	5,082		$	4,960
Regulatory assets	599			565
Pension expense	178			199
Other	64			57
Total deferred tax liabilities	$	5,923		$	5,781
Deferred tax assets:
Regulatory liabilities	$	879		$	886
Tax credit carryforward	642			607
NOL carryforward	51			293
NOL and tax credit valuation allowances	(79		)	(77		)
Other employee benefits	124			132
Deferred ITCs	16			17
Rate refund	60			10
Other	65			68
Total deferred tax assets	$	1,758		$	1,936
Net deferred tax liability	$	4,165		$	3,845

8. Share-Based Compensation

Incentive Plans Including Share-Based Compensation — Xcel Energy Inc. has three incentive plans that include share-based payment elements. Plans and authorized equity shares for awards:

• Omnibus Incentive Plan - 7.0 million shares;

• Long-Term Incentive Plan - 8.3 million shares; and,

• Executive Annual Incentive Award Plan - 1.2 million shares.

Restricted Stock — The Executive Annual Incentive Award Plan and Omnibus Incentive Plan allow certain employees to elect to receive shares of common or restricted stock. Restricted stock is treated as an equity award and vests and settles in equal annual installments over a three-year period. Restricted stock has a fair value equal to the market trading price of Xcel Energy Inc.’s stock at the grant date.

Shares of restricted stock granted at Dec. 31:

(Shares in Thousands)	2018		2017		2016
Granted shares	18		15		20
Grant date fair value	$	44.68	$	42.00	$	38.82

Changes in nonvested restricted stock:

(Shares in Thousands)	Shares		Weighted Average Grant Date Fair Value
Nonvested restricted stock at Jan. 1, 2018	44		$	39.71
Granted	18		44.68
Forfeited	—		—
Vested	(27	)	37.25
Dividend equivalents	1		46.27
Nonvested restricted stock at Dec. 31, 2018	36		44.29

Other Equity Awards — Xcel Energy Inc.’s Board of Directors has granted equity awards under the Xcel Energy Inc. Long-Term Incentive Plan and the Omnibus Incentive Plan. These plans include various vesting conditions and performance goals. At the end of the restricted period, such grants will be awarded if the vesting conditions and/or performance goals are met.

Certain employees are granted equity awards with a portion subject only to service conditions, and the other portion subject to performance conditions. A total of 0.3 million time-based equity shares subject only to service conditions were granted annually in 2018, 2017 and 2016, respectively.

The performance conditions for a portion of the awards granted from 2016 to 2018 are based on relative TSR and environmental goals. Equity awards with performance conditions will be settled or forfeited after three years, with payouts ranging from zero to 200 percent depending on achievement.

Equity award units granted to employees (excluding restricted stock):

(Units in Thousands)	2018		2017		2016
Granted units	500		503		522
Weighted average grant date fair value	$	47.60	$	41.02	$	36.00

Equity awards vested:

(Units in Thousands)	2018		2017		2016
Vested Units	475		467		530
Total Fair Value	$	23,393	$	22,459	$	21,575

Changes in the nonvested portion of equity award units for 2018:

(Units in Thousands)	Units		Weighted Average Grant Date Fair Value
Nonvested Units at Jan. 1, 2018	995		$	38.48
Granted	500		47.60
Forfeited	(126	)	41.74
Vested	(475	)	35.92
Dividend equivalents	45		40.74
Nonvested Units at Dec. 31, 2018	939		44.30

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Stock Equivalent Units — Non-employee members of Xcel Energy Inc. Board of Directors may elect to receive their annual equity grant as stock equivalent units in lieu of common stock. Each unit’s value is equal to one share of Xcel Energy Inc. common stock. The annual equity grant is vested as of the date of each member’s election to the Board of Directors; there is no further service or other condition.  Directors may also elect to receive their cash fees as stock equivalent units in lieu of cash. Stock equivalent units are payable as a distribution of common stock upon a director’s termination of service.

Stock equivalent units granted:

(Units in Thousands)	2018		2017		2016
Granted units	36		51		49
Weighted average grant date fair value	$	45.44	$	46.05	$	40.68

Changes in stock equivalent units:

(Units in Thousands)	Units		Weighted Average Grant Date Fair Value
Stock equivalent units at Jan. 1, 2018	753		$	29.83
Granted	36		45.44
Units distributed	(123	)	31.21
Dividend equivalents	22		46.40
Stock equivalent units at Dec. 31, 2018	688		30.93

TSR Liability Awards — Xcel Energy Inc.’s Board of Directors has granted TSR liability awards under the Long-Term Incentive Plan and Omnibus Incentive Plan. The plans allow Xcel Energy to attach various performance goals to the awards granted. The liability awards have been historically dependent on relative TSR measured over a three-year period. Xcel Energy Inc.’s TSR is compared to a 22-member utilities peer group for 2016 - 2018 awards. Potential payouts of the awards range from zero to 200%.

TSR liability awards granted:

(In Thousands)	2018	2017	2016
Awards granted	239	240	264

TSR liability awards settled:

(In Thousands)	2018		2017		2016
Awards settled	482		454		354
Settlement amount (cash, common stock and deferred amounts)	$	21,534	$	19,083	$	13,724

TSR liability awards of $8 million were settled in cash in 2018.

Share-Based Compensation Expense — Vesting of employee equity awards is typically predicated on the achievement of a TSR or environmental measures target, other than for restricted stock. Additionally, approximately 0.3 million of equity award units were granted annually in 2016 - 2018, with vesting subject only to service conditions of three years. Generally these instruments are considered to be equity awards as the award settlement determination (shares or cash) is made by Xcel Energy, not the participants. In addition, these awards have not been previously settled in cash and Xcel Energy plans to continue electing share settlement. Grant date fair value of equity awards is expensed over the service period.

TSR liability awards have been historically settled partially in cash, and do not qualify as equity awards, but rather are accounted for as liabilities. As liability awards, the fair value on which ratable expense is based, as employees vest in their rights to those awards, is remeasured each period based on the current stock price and performance achievement, and final expense is based on the market value of the shares on the date the award is settled.

Compensation costs related to share-based awards:

(Millions of Dollars)	2018		2017		2016
Compensation cost for share-based awards (a)	$	45	$	57	$	41
Tax benefit recognized in income	12		22		16

^(a)  Compensation costs for share-based payment are included in O&M expense.

There was approximately $38 million in 2018 and $44 million in 2017 of total unrecognized compensation cost related to nonvested share-based compensation awards. Xcel Energy expects to recognize the unrecognized amount over a weighted average period of 1.6 years.

9. Earnings Per Share

Basic EPS was computed by dividing the earnings available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS was computed by dividing the earnings available to common shareholders by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock (i.e., common stock equivalents) were settled. The weighted average number of potentially dilutive shares outstanding used to calculate diluted EPS is calculated using the treasury stock method.

Common Stock Equivalents— Xcel Energy Inc. has common stock equivalents related to forward equity agreements and certain equity awards in share-based compensation arrangements. Common stock equivalents include commitments to issue common stock related to time based equity compensation awards.

Stock equivalent units granted to Xcel Energy Inc.’s Board of Directors are included in common shares outstanding upon grant date as there is no further service, performance or market condition associated with these awards. Restricted stock issued to employees under the Xcel Energy Inc. Executive Annual Incentive Award Plan is included in common shares outstanding when granted.

Share-based compensation arrangements for which there is currently no dilutive impact to EPS include the following:

• Equity awards subject to a performance condition; included in common shares outstanding when all necessary conditions for settlement have been satisfied by the end of the reporting period; and,

• Liability awards subject to a performance condition; any portions settled in shares are included in common shares outstanding upon settlement.

Diluted common shares outstanding included common stock equivalents of 0.5 million, 0.6 million and 0.7 million shares for 2018, 2017 and 2016.

10.    Fair Value of Financial Assets and Liabilities

Fair Value Measurements

Accounting guidance for fair value measurements and disclosures provides a single definition of fair value and requires disclosures about assets and liabilities measured at fair value. A hierarchical framework for disclosing the observability of the inputs utilized in measuring assets and liabilities at fair value is established by this guidance.

• Level 1 — Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices.

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• Level 2 — Pricing inputs are other than quoted prices in active markets, but are either directly or indirectly observable as of the reporting date. The types of assets and liabilities included in Level 2 are typically either comparable to actively traded securities or contracts, or priced with models using highly observable inputs.

• Level 3 — Significant inputs to pricing have little or no observability as of the reporting date. The types of assets and liabilities included in Level 3 are those valued with models requiring significant management judgment or estimation.

Specific valuation methods include:

Cash equivalents— The fair values of cash equivalents are generally based on cost plus accrued interest; money market funds are measured using quoted NAV.

Investments in equity securities and other funds— Equity securities are valued using quoted prices in active markets. The fair values for commingled funds are measured using NAVs. The investments in commingled funds may be redeemed for NAV with proper notice. Private equity commingled fund investments require approval of the fund for any unscheduled redemption, and such redemptions may be approved or denied by the fund at its sole discretion. Unscheduled distributions from real estate commingled funds investments may be redeemed with proper notice, however, withdrawals may be delayed or discounted as a result of fund illiquidity.

Investments in debt securities— Fair values for debt securities are determined by a third party pricing service using recent trades and observable spreads from benchmark interest rates for similar securities.

Interest rate derivatives— Fair values of interest rate derivatives are based on broker quotes that utilize current market interest rate forecasts.

Commodity derivatives— Methods used to measure the fair value of commodity derivative forwards and options utilize forward prices and volatilities, as well as pricing adjustments for specific delivery locations, and are generally assigned a Level 2 classification. When contractual settlements relate to inactive delivery locations or extend to periods beyond those readily observable on active exchanges or quoted by brokers, the significance of the use of less observable forecasts of forward prices and volatilities on a valuation is evaluated and may result in Level 3 classification.

Electric commodity derivatives held by NSP-Minnesota and SPS include transmission congestion instruments, generally referred to as FTRs. FTRs purchased from a RTO are financial instruments that entitle or obligate the holder to monthly revenues or charges based on transmission congestion across a given transmission path. The value of an FTR is derived from, and designed to offset, the cost of transmission congestion. In addition to overall transmission load, congestion is also influenced by the operating schedules of power plants and the consumption of electricity pertinent to a given transmission path. Unplanned plant outages, scheduled plant maintenance, changes in the relative costs of fuels used in generation, weather and overall changes in demand for electricity can each impact the operating schedules of the power plants on the transmission grid and the value of an FTR.

If forecasted costs of electric transmission congestion increase or decrease for a given FTR path, the value of that particular FTR instrument will likewise increase or decrease. Given the limited observability of important inputs to the value of FTRs between auction processes, including expected plant operating schedules and retail and wholesale demand, fair value measurements for FTRs have been assigned a Level 3.

Non-trading monthly FTR settlements are included in fuel and purchased energy cost recovery mechanisms as applicable in each jurisdiction, and therefore changes in the fair value of the yet to be settled portions of most FTRs are deferred as a regulatory asset or liability. Given this regulatory treatment and the limited magnitude of FTRs relative to the electric utility operations of NSP-Minnesota and SPS, the numerous unobservable quantitative inputs pertinent to the value of FTRs are insignificant to the consolidated financial statements of Xcel Energy.

Non-Derivative Fair Value Measurements

The NRC requires NSP-Minnesota to maintain a portfolio of investments to fund the costs of decommissioning its nuclear generating plants. Assets of the nuclear decommissioning fund are legally restricted for the purpose of decommissioning these facilities. The fund contains cash equivalents, debt securities, equity securities and other investments. NSP-Minnesota uses the MPUC approved asset allocation for the escrow and investment targets by asset class for both the escrow and qualified trust.

NSP-Minnesota recognizes the costs of funding the decommissioning over the lives of the nuclear plants, assuming rate recovery of all costs. Realized and unrealized gains on fund investments over the life of the fund are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Consequently, any realized and unrealized gains and losses on securities in the nuclear decommissioning fund are deferred as a component of the regulatory asset.

Unrealized gains for the nuclear decommissioning fund were $450 million and $560 million as of Dec. 31, 2018 and 2017, respectively, and unrealized losses were $45 million and $7 million as of Dec. 31, 2018 and 2017, respectively.

Non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund:

	Dec. 31, 2018
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		NAV		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	24	$	24	$	—	$	—	$	—	$	24
Commingled funds	758		79		—		—		819		898
Debt securities	466		—		436		—		—		436
Equity securities	401		697		—		—		—		697
Total	$	1,649	$	800	$	436	$	—	$	819	$	2,055

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $141 million of equity investments in unconsolidated subsidiaries and $121 million of rabbi trust assets and miscellaneous investments.

	Dec. 31, 2017
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		NAV		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	29	$	29	$	—	$	—	$	—	$	29
Commingled funds	701		223		—		—		659		882
Debt securities	438		—		441		—		—		441
Equity securities	423		791		—		—		—		791
Total	$	1,591	$	1,043	$	441	$	—	$	659	$	2,143

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $140 million of equity investments in unconsolidated subsidiaries and $114 million of rabbi trust assets and miscellaneous investments.

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For the years ended Dec. 31, 2018 and 2017, there were no Level 3 nuclear decommissioning fund investments or transfer of amounts between levels.

Contractual maturity dates of debt securities in the nuclear decommissioning fund as of Dec. 31, 2018:

	Final Contractual Maturity
(Millions of Dollars)	Due in 1 Year or Less		Due in 1 to 5 Years		Due in 5 to 10 Years		Due after 10 Years		Total
Debt securities	$	10	$	107	$	211	$	108	$	436

Rabbi Trusts

Xcel Energy has established rabbi trusts to provide partial funding for future distributions of its SERP and deferred compensation plan.

Cost and fair value of assets held in rabbi trusts:

	Dec. 31, 2018
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	16	$	16	$	—	$	—	$	16
Mutual funds	52		51		—		—		51
Total	$	68	$	67	$	—	$	—	$	67

	Dec. 31, 2017
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	12	$	12	$	—	$	—	$	12
Mutual funds	47		50		—		—		50
Total	$	59	$	62	$	—	$	—	$	62

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet.

Derivative Fair Value Measurements

Xcel Energy enters into derivative instruments, including forward contracts, futures, swaps and options, for trading purposes and to manage risk in connection with changes in interest rates, utility commodity prices and vehicle fuel prices.

Interest Rate Derivatives — Xcel Energy enters into various instruments that effectively fix the interest payments on certain floating rate debt obligations or effectively fix the yield or price on a specified benchmark interest rate for an anticipated debt issuance for a specific period. These derivative instruments are generally designated as cash flow hedges for accounting purposes.

As of Dec. 31, 2018, accumulated other comprehensive losses related to interest rate derivatives included $3 million of net losses expected to be reclassified into earnings during the next 12 months as the hedged transactions impact earnings.

As of Dec 31, 2018, Xcel Energy had unsettled interest rate swaps outstanding with a notional amount of $300 million. These interest rate derivatives were designated as hedges, and as such, changes in fair value are recorded to other comprehensive income.

Wholesale and Commodity Trading Risk — Xcel Energy Inc.’s utility subsidiaries conduct various wholesale and commodity trading activities, including the purchase and sale of electric capacity, energy, energy-related instruments and natural gas-related instruments, including derivatives. Xcel Energy is allowed to conduct these activities within guidelines and limitations as approved by its risk management committee, comprised of management personnel not directly involved in activities governed by this policy.

Commodity Derivatives — Xcel Energy enters into derivative instruments to manage variability of future cash flows from changes in commodity prices in its electric and natural gas operations, as well as for trading purposes. This could include the purchase or sale of energy or energy-related products, natural gas to generate electric energy, natural gas for resale, FTRs, vehicle fuel and weather derivatives.

As of Dec. 31, 2018, Xcel Energy had no vehicle fuel contracts designated as cash flow hedges. Xcel Energy may enter into derivative instruments that mitigate commodity price risk on behalf of electric and natural gas customers, but may not be designated as qualifying hedging transactions. Changes in the fair value of non-trading commodity derivative instruments are recorded in other comprehensive income or deferred as a regulatory asset or liability. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms. Immaterial amounts to income related to the ineffectiveness of cash flow hedges were recorded for the years ended Dec. 31, 2018 and 2017.

As of Dec. 31, 2018, there were no net gains related to commodity derivative cash flow hedges recorded as a component of accumulated other comprehensive losses or related amounts expected to be reclassified into earnings during the next 12 months.

Xcel Energy enters into commodity derivative instruments for trading purposes not directly related to commodity price risks associated with serving its electric and natural gas customers. Changes in the fair value of these commodity derivatives are recorded in electric operating revenues, net of amounts credited to customers under margin-sharing mechanisms.

Gross notional amounts of commodity forwards, options and FTRs as of Dec. 31:

(Amounts in Millions) (a) (b)	2018	2017
MWh of electricity	87	68
MMBtu of natural gas	92	37

^(a)  Amounts are not reflective of net positions in the underlying commodities.

^(b)  Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

Consideration of Credit Risk and Concentrations — Xcel Energy continuously monitors the creditworthiness of counterparties to its interest rate derivatives and commodity derivative contracts prior to settlement, and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented in the consolidated balance sheets.

Xcel Energy’s utility subsidiaries’ most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to their wholesale, trading and non-trading commodity activities.

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As of Dec. 31, 2018, six of Xcel Energy’s 10 most significant counterparties for these activities, comprising $96 million or 43% of this credit exposure, had investment grade credit ratings from Standard & Poor’s, Moody’s or Fitch Ratings. Three of the 10 most significant counterparties, comprising $20 million or 9% of this credit exposure, were not rated by these external agencies, but based on Xcel Energy’s internal analysis, had credit quality consistent with investment grade. One of these significant counterparties, comprising $12 million or 5% of this credit exposure, had credit quality less than investment grade, based on Xcel Energy’s internal analysis. Eight of these significant counterparties are municipal or cooperative electric entities or other utilities.

Qualifying Cash Flow Hedges — Financial impact of qualifying interest rate and vehicle fuel cash flow hedges on Xcel Energy’s accumulated other comprehensive loss, included in the consolidated statements of common stockholders’ equity and in the consolidated statements of comprehensive income:

(Millions of Dollars)	2018			2017			2016
Accumulated other comprehensive loss related to cash flow hedges at Jan. 1	$	(58	)	$	(51	)	$	(55	)
After-tax net unrealized losses related to derivatives accounted for as hedges	(5		)	—			—
After-tax net realized losses on derivative transactions reclassified into earnings	3			3			4
Adoption of ASU. 2018-02 (a)	—			(10		)	—
Accumulated other comprehensive loss related to cash flow hedges at Dec. 31	$	(60	)	$	(58	)	$	(51	)

^(a)  In 2017, Xcel Energy implemented ASU No. 2018-02 related to TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.

Impact of derivative activity:

	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:
(Millions of Dollars)	Accumulated Other Comprehensive Loss			Regulatory (Assets) and Liabilities
Year Ended Dec. 31, 2018
Derivatives designated as cash flow hedges
Interest rate	$	(7	)	$	—
Total	$	(7	)	$	—
Other derivative instruments
Electric commodity	$	—		$	1
Natural gas commodity	—			10
Total	$	—		$	11
Year Ended Dec. 31, 2017
Other derivative instruments
Electric commodity	$	—		$	10
Natural gas commodity	—			(13		)
Total	$	—		$	(3	)
Year Ended Dec. 31, 2016
Other derivative instruments
Electric commodity	$	—		$	17
Natural gas commodity	—			1
Total	$	—		$	18

	Pre-Tax (Gains) Losses Reclassified into Income During the Period from:							Pre-Tax Gains (Losses) Recognized During the Period in Income
(Millions of Dollars)	Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Year Ended Dec. 31, 2018
Derivatives designated as cash flow hedges
Interest rate	$	4	(a)	$	—			$	—
Total	$	4		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	14		(b)
Electric commodity	—			(1		)	(c)	—
Natural gas commodity	—			(6		)	(d)	(4		)	(d)
Total	$	—		$	(7	)		$	10
Year Ended Dec. 31, 2017
Derivatives designated as cash flow hedges
Interest rate	$	5	(a)	$	—			$	—
Total	$	5		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	10		(b)
Electric commodity	—			(15		)	(c)	—
Natural gas commodity	—			3			(d)	(6		)	(d)
Total	$	—		$	(12	)		$	4
Year Ended Dec. 31, 2016
Derivatives designated as cash flow hedges
Interest rate	$	6	(a)	$	—			$	—
Total	$	6		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	2		(b)
Electric commodity	—			(8		)	(c)	—
Natural gas commodity	—			15			(d)	(8		)	(d)
Total	$	—		$	7			$	(6	)

^(a)  Amounts recorded to interest charges.

^(b)  Amounts recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.

^(c)  Amounts recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.

^(d)  Amounts for the year ended Dec. 31, 2018 included $1 million of settlement losses on derivatives entered to mitigate natural gas price risk for electric generation recorded to electric fuel and purchased power, subject to cost-recovery mechanisms and reclassified to a regulatory asset, as appropriate. Such gains and losses for the years ended Dec. 31, 2017 and 2016 were immaterial. Remaining settlement losses for the years ended Dec. 31, 2018, 2017 and 2016 related to natural gas operations and were recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

Xcel Energy had no derivative instruments designated as fair value hedges during the years ended Dec. 31, 2018, 2017 and 2016.

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Credit Related Contingent Features—Contract provisions for derivative instruments that the utility subsidiaries enter, including those accounted for as normal purchase-normal sale contracts and therefore not reflected on the consolidated balance sheets, may require the posting of collateral or settlement of the contracts for various reasons, including if the applicable utility subsidiary’s credit ratings are downgraded below its investment grade credit rating by any of the major credit rating agencies, or for cross default contractual provisions if there was a failure under other financing arrangements related to payment terms or other covenants. As of Dec. 31, 2018 and 2017, there were no derivative instruments in a liability position with such underlying contract provisions.

Certain derivative instruments are also subject to contract provisions that contain adequate assurance clauses. These provisions allow counterparties to seek performance assurance, including cash collateral, in the event that a given utility subsidiary’s ability to fulfill its contractual obligations is reasonably expected to be impaired. Xcel Energy had no collateral posted related to adequate assurance clauses in derivative contracts as of Dec. 31, 2018 and 2017.

Recurring Fair Value Measurements — Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis:

	Dec. 31, 2018													Dec. 31, 2017
	Fair Value						Fair Value Total		Netting (a)					Fair Value						Fair Value Total		Netting (a)
(Millions of Dollars)	Level 1		Level 2		Level 3							Total		Level 1		Level 2		Level 3							Total
Current derivative assets
Commodity trading	$	4	$	92	$	2	$	98	$	(44	)	$	54	$	2	$	22	$	—	$	24	$	(15	)	$	9
Electric commodity	—		—		25		25		—			25		—		—		32		32		(2		)	30
Natural gas commodity	—		4		—		4		—			4		—		—		—		—		—			—
Total current derivative assets	$	4	$	96	$	27	$	127	$	(44	)	83		$	2	$	22	$	32	$	56	$	(17	)	39
PPAs (b)												4													5
Current derivative instruments												$	87												$	44
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	—	$	27	$	5	$	32	$	(14	)	$	18	$	—	$	31	$	5	$	36	$	(7	)	$	29
Total noncurrent derivative assets	$	—	$	27	$	5	$	32	$	(14	)	18		$	—	$	31	$	5	$	36	$	(7	)	29
PPAs (b)												16													19
Noncurrent derivative instruments												$	34												$	48

	Dec. 31, 2018													Dec. 31, 2017
	Fair Value						Fair Value Total		Netting (a)					Fair Value						Fair Value Total		Netting (a)
(Millions of Dollars)	Level 1		Level 2		Level 3							Total		Level 1		Level 2		Level 3							Total
Current derivative liabilities
Derivatives designated as cash flow hedges:
Interest rate	$	—	$	7	$	—	$	7	$	—		$	7	$	—	$	—	$	—	$	—	$	—		$	—
Other derivative instruments:
Commodity trading	4		88		2		94		(60		)	34		2		18		—		20		(15		)	5
Electric commodity	—		—		—		—		—			—		—		—		2		2		(2		)	—
Natural gas commodity	—		—		—		—		—			—		—		1		—		1		—			1
Total current derivative liabilities	$	4	$	95	$	2	$	101	$	(60	)	41		$	2	$	19	$	2	$	23	$	(17	)	6
PPAs (b)												20													23
Current derivative instruments												$	61												$	29
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	—	$	18	$	1	$	19	$	17		$	36	$	—	$	24	$	—	$	24	$	(10	)	$	14
Total noncurrent derivative liabilities	$	—	$	18	$	1	$	19	$	17		36		$	—	$	24	$	—	$	24	$	(10	)	14
PPAs (b)												93													112
Noncurrent derivative instruments												$	129												$	126

^(a)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements as of Dec. 31, 2018 and 2017. At Dec. 31, 2018 and 2017, derivative assets and liabilities include $32 million and $0 million of obligations to return cash collateral, respectively. At Dec. 31, 2018 and 2017, derivative assets and liabilities include rights to reclaim cash collateral of $15 million and $3 million, respectively. Counterparty netting excludes settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

^(b)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

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Changes in Level 3 commodity derivatives:

	Year Ended Dec. 31
(Millions of Dollars)	2018			2017			2016
Balance at Jan. 1	$	35		$	17		$	18
Purchases	59			82			35
Settlements	(59		)	(97		)	(89		)
Net transactions recorded during the period:
(Losses) gains recognized in earnings (a)	(1		)	5			—
Net (losses) gains recognized as regulatory assets and liabilities	(5		)	28			53
Balance at Dec. 31	$	29		$	35		$	17

^(a)  Amounts relate to commodity derivatives held at the end of the period.

Xcel Energy recognizes transfers between levels as of the beginning of each period. There were no transfers of amounts between levels for derivative instruments for 2016 - 2018.

Fair Value of Long-Term Debt

As of Dec. 31, other financial instruments for which the carrying amount did not equal fair value:

	2018				2017
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	16,209	$	16,755	$	14,977	$	16,531

Fair value of Xcel Energy’s long-term debt is estimated based on recent trades and observable spreads from benchmark interest rates for similar securities. Fair value estimates are based on information available to management as of Dec. 31, 2018 and 2017, and given the observability of the inputs, fair values presented for long-term debt were assigned as Level 2.

11. Benefit Plans and Other Postretirement Benefits

Pension and Postretirement Health Care Benefits

Xcel Energy has several noncontributory, defined benefit pension plans that cover almost all employees. Generally, benefits are based on a combination of years of service and average pay. Xcel Energy’s policy is to fully fund into an external trust the actuarially determined pension costs subject to the limitations of applicable employee benefit and tax laws.

In addition to the qualified pension plans, Xcel Energy maintains a SERP and a nonqualified pension plan. The SERP is maintained for certain executives that were participants in the plan in 2008, when the SERP was closed to new participants. The nonqualified pension plan provides benefits for compensation that is in excess of the limits applicable to the qualified pension plans, with distributions funded by Xcel Energy’s consolidated operating cash flows. Obligations of the SERP and nonqualified plan as of Dec. 31, 2018 and 2017 were $33 million and $37 million, respectively. Xcel Energy recognized net benefit cost for the SERP and nonqualified plans of $4 million in 2018 and $5 million in 2017.

In 2016, Xcel Energy established rabbi trusts to provide partial funding for future distributions of the SERP and its deferred compensation plan, supplemented by Xcel Energy’s consolidated operating cash flows.

Xcel Energy has a contributory health and welfare benefit plan that provides health care and death benefits to certain Xcel Energy retirees.

• NSP-Minnesota and NSP-Wisconsin discontinued subsidizing health care benefits for non-bargaining employees retiring after 1998 and for bargaining employees who retired after 1999.

• Xcel Energy discontinued subsidizing health care benefits for nonbargaining employees of the former NCE who retired after June 30, 2003.

• Xcel Energy discontinued health care benefits for SPS bargaining employees hired after Jan. 1, 2012.

Xcel Energy bases the investment-return assumption on expected long-term performance for each of the asset classes in its pension and postretirement health care portfolios. For pension assets, Xcel Energy considers the historical returns achieved by its asset portfolio over the past 20 years or longer period, as well as long-term projected return levels.

Pension cost determination assumes a forecasted mix of investment types over the long-term.

• Investment returns in 2018 were below the assumed level of 6.87%;

• Investment returns in 2017 were above the assumed level of 6.87%;

• Investment returns in 2016 were below the assumed level of 6.87%; and,

• In 2019, Xcel Energy’s expected investment-return assumption is 6.87%.

Pension plan and postretirement benefit assets are invested in a portfolio according to Xcel Energy’s return, liquidity and diversification objectives to provide a source of funding for plan obligations and minimize contributions to the plan, within appropriate levels of risk. The principal mechanism for achieving these objectives is the asset allocation given the long-term risk, return, correlation and liquidity characteristics of each particular asset class. There were no significant concentrations of risk in any industry, index, or entity. Market volatility can impact even well-diversified portfolios and significantly affect the return levels achieved by the assets in any year.

State agencies also have issued guidelines to the funding of postretirement benefit costs. SPS is required to fund postretirement benefit costs for Texas and New Mexico amounts collected in rates. PSCo is required to fund postretirement benefit costs in irrevocable external trusts that are dedicated to the payment of these postretirement benefits. These assets are invested in a manner consistent with the investment strategy for the pension plan.

Xcel Energy’s ongoing investment strategy is based on plan-specific investment recommendations that seek to minimize potential investment and interest rate risk as a plan’s funded status increases over time. The investment recommendations result in a greater percentage of long-duration fixed income securities being allocated to specific plans having relatively higher funded status ratios and a greater percentage of growth assets being allocated to plans having relatively lower funded status ratios.

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Plan Assets

The following presents, for each of the fair value hierarchy levels, Xcel Energy’s pension plan assets measured at fair value:

	Dec. 31, 2018 (a)												Dec. 31, 2017 (a)
(Millions of Dollars)	Level 1		Level 2		Level 3		Measured at NAV			Total			Level 1			Level 2		Level 3		Measured at NAV		Total
Cash equivalents	$	137	$	—	$	—	$	—		$	137		$	196		$	—	$	—	$	—	$	196
Commingled funds:	914		—		—		987			1,901			1,054			—		—		1,075		2,129
Debt securities:	—		621		—		—			621			—			673		—		—		673
Equity securities:	106		—		—		—			106			114			—		—		—		114
Other	2		5		—		(30		)	(23		)	(29		)	4		—		1		(24		)
Total	$	1,159	$	626	$	—	$	957		$	2,742		$	1,335		$	677	$	—	$	1,076	$	3,088

^(a)  See Note 10 for further information regarding fair value measurement inputs and methods.

The following presents, for each of the fair value hierarchy levels, Xcel Energy’s postretirement benefit plan assets that were measured at fair value:

	Dec. 31, 2018 (a)										Dec. 31, 2017 (a)
(Millions of Dollars)	Level 1		Level 2		Level 3		Measured at NAV		Total		Level 1		Level 2		Level 3		Measured at NAV		Total
Cash equivalents	$	19	$	—	$	—	$	—	$	19	$	29	$	—	$	—	$	—	$	29
Insurance contracts	—		45		—		—		45		—		50		—		—		50
Commingled funds	133		—		—		40		173		148		—		—		—		148
Debt securities	—		179		—		—		179		—		198		—		—		198
Equity securities	—		—		—		—		—		35		—		—		—		35
Other	—		1		—		—		1		—		1		—		—		1
Total	$	152	$	225	$	—	$	40	$	417	$	212	$	249	$	—	$	—	$	461

^(a)  See Note 10 for further information on fair value measurement inputs and methods.

No assets were transferred in or out of Level 3 for 2018 and 2017.

Funded Status — Comparisons of the actuarially computed benefit obligation, changes in plan assets and funded status of the pension and postretirement health care plans for Xcel Energy are as follows:

	Pension Benefits						Postretirement Benefits
(Millions of Dollars)	2018			2017			2018			2017
Change in Benefit Obligation:
Obligation at Jan. 1	$	3,828		$	3,682		$	621		$	603
Service cost	94			94			2			2
Interest cost	133			147			22			24
Plan amendments	—			(13		)	—			—
Actuarial (gain) loss	(224		)	259			(62		)	33
Plan participants’ contributions	—			—			8			8
Medicare subsidy reimbursements	—			—			1			1
Benefit payments (a)	(354		)	(341		)	(50		)	(50		)
Obligation at Dec. 31	$	3,477		$	3,828		$	542		$	621
Change in Fair Value of Plan Assets:
Fair value of plan assets at Jan. 1	$	3,088		$	2,856		$	461		$	442
Actual return on plan assets	(142		)	411			(13		)	41
Employer contributions	150			162			11			20
Plan participants’ contributions	—			—			8			8
Benefit payments	(354		)	(341		)	(50		)	(50		)
Fair value of plan assets at Dec. 31	$	2,742		$	3,088		$	417		$	461
Funded status of plans at Dec. 31	$	(735	)	$	(740	)	$	(125	)	$	(160	)
Amounts recognized in the Consolidated Balance Sheet at Dec. 31:
Current liabilities	$	—		$	—		$	(7	)	$	(3	)
Noncurrent liabilities	(735		)	(740		)	(118		)	(157		)
Net amounts recognized	$	(735	)	$	(740	)	$	(125	)	$	(160	)

^(a)  Includes approximately $198 million in 2018 and $174 million in 2017 of lump-sum benefit payments used in the determination of a settlement charge.

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	Pension Benefits				Postretirement Benefits
(Millions of Dollars)	2018		2017		2018		2017
Significant Assumptions Used to Measure Benefit Obligations:
Discount rate for year-end valuation	4.31	%	3.63	%	4.32	%	3.62	%
Expected average long-term increase in compensation level	3.75		3.75		N/A		N/A
Mortality table	RP-2014		RP-2014		RP-2014		RP-2014
Health care costs trend rate — initial: Pre-65	N/A		N/A		6.50	%	7.00	%
Health care costs trend rate — initial: Post-65	N/A		N/A		5.35	%	5.50	%
Ultimate trend assumption — initial: Pre-65	N/A		N/A		4.50	%	4.50	%
Ultimate trend assumption — initial: Post-65	N/A		N/A		4.50	%	4.50	%
Years until ultimate trend is reached	N/A		N/A		4		5

Accumulated benefit obligation for the pension plan was $3,275 million and $3,612 million as of Dec. 31, 2018 and 2017, respectively.

Net Periodic Benefit Cost (Credit) —Net periodic benefit cost (credit), other than the service cost component, is included in other income in the consolidated statements of income.

Components of net periodic benefit cost (credit) and amounts recognized in other comprehensive income and regulatory assets and liabilities:

	Pension Benefits									Postretirement Benefits
(Millions of Dollars)	2018			2017			2016			2018			2017			2016
Service cost	$	94		$	94		$	92		$	2		$	2		$	2
Interest cost	133			147			160			22			24			26
Expected return on plan assets	(209		)	(209		)	(210		)	(26		)	(25		)	(25		)
Amortization of prior service credit	(5		)	(2		)	(2		)	(11		)	(11		)	(11		)
Amortization of net loss	111			107			97			8			7			4
Settlement charge (a)	91			81			—			—			—			—
Net periodic pension cost (credit)	215			218			137			(5		)	(3		)	(4		)
Costs not recognized due to effects of regulation	(75		)	(79		)	(15		)	2			—			—
Net benefit cost (credit) recognized for financial reporting	$	140		$	139		$	122		$	(3	)	$	(3	)	$	(4	)
Significant Assumptions Used to Measure Costs:
Discount rate	3.63		%	4.13		%	4.66		%	3.62		%	4.13		%	4.65		%
Expected average long-term increase in compensation level	3.75			3.75			4.00			—			—			—
Expected average long-term rate of return on assets	6.87			6.87			6.87			5.30			5.80			5.80

^(a)  A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In 2018 and 2017, as a result of lump-sum distributions during the 2018 and 2017 plan years, Xcel Energy recorded a total pension settlement charge of $91 million in 2018 and $81 million in 2017, the majority of which was not recognized due to the effects of regulation. A total of $11 million and $8 million was recorded in the consolidated statements of income in 2018 and 2017, respectively.

	Pension Benefits						Postretirement Benefits
(Millions of Dollars)	2018			2017			2018			2017
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost:
Net loss	$	1,633		$	1,709		$	116		$	147
Prior service credit	(20		)	(25		)	(33		)	(44		)
Total	$	1,613		$	1,684		$	83		$	103
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost Have Been Recorded as Follows Based Upon Expected Recovery in Rates:
Current regulatory assets	$	94		$	100		$	—		$	—
Noncurrent regulatory assets	1,446			1,511			89			107
Current regulatory liabilities	—			—			(1		)	(1		)
Noncurrent regulatory liabilities	—			—			(10		)	(10		)
Deferred income taxes	19			19			1			2
Net-of-tax accumulated other comprehensive income	54			54			4			5
Total	$	1,613		$	1,684		$	83		$	103

Measurement date Dec. 31, 2018 Dec. 31, 2017 Dec. 31, 2018 Dec. 31, 2017

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Cash Flows — Funding requirements can be impacted by changes to actuarial assumptions, actual asset levels and other calculations prescribed by the requirements of income tax and other pension-related regulations. Required contributions were made in 2016 - 2019 to meet minimum funding requirements.

Voluntary and required pension funding contributions:

• $150 million in January 2019;

• $150 million in 2018;

• $162 million in 2017; and,

• $125 million in 2016.

The postretirement health care plans have no funding requirements other than fulfilling benefit payment obligations, when claims are presented and approved. Additional cash funding requirements are prescribed by certain state and federal rate regulatory authorities.

Voluntary postretirement funding contributions:

• Expects to contribute approximately $11 million during 2019;

• $11 million during 2018;

• $20 million during 2017; and,

• $18 million during 2016.

Targeted asset allocations:

	Pension Benefits				Postretirement Benefits
	2018		2017		2018		2017
Domestic and international equity securities	36	%	36	%	18	%	24	%
Long-duration fixed income securities	30		27		—		—
Short-to-intermediate fixed income securities	17		20		70		60
Alternative investments	15		15		8		9
Cash	2		2		4		7
Total	100	%	100	%	100	%	100	%

Plan Amendments —The Xcel Energy Pension Plan and Xcel Energy Inc. Nonbargaining Pension Plan (South) were amended in 2017 to reduce supplemental benefits for non-bargaining participants as well as to allow the transfer of a portion of non-qualified pension obligations into the qualified plans. In 2016, the Xcel Energy Pension Plan was amended to change the discount rate basis for lump-sum conversion to annuity participants and annuity conversion to lump-sum participants. Annual credits contributed to the PSCo Bargaining Plan retirement spending account also increased.

In 2018 and 2017, there were no plan amendments made which affected the postretirement benefit obligation.

Projected Benefit Payments

Xcel Energy’s projected benefit payments:

(Millions of Dollars)	Projected Pension Benefit Payments		Gross Projected Postretirement Health Care Benefit Payments		Expected Medicare Part D Subsidies		Net Projected Postretirement Health Care Benefit Payments
2019	$	281	$	45	$	2	$	43
2020	260		45		2		43
2021	259		45		2		43
2022	260		44		2		42
2023	259		43		2		41
2024-2028	1,238		197		13		184

Defined Contribution Plans

Xcel Energy maintains 401(k) and other defined contribution plans that cover most employees. Total expense to these plans was approximately $38 million in 2018, $37 million in 2017 and $36 million in 2016.

Multiemployer Plans

NSP-Minnesota and NSP-Wisconsin each contribute to several union multiemployer pension and other postretirement benefit plans, none of which are individually significant. These plans provide pension and postretirement health care benefits to certain union employees who may perform services for multiple employers and do not participate in the NSP-Minnesota and NSP-Wisconsin sponsored pension and postretirement health care plans. Contributing to these types of plans creates risk that differs from providing benefits under NSP-Minnesota and NSP-Wisconsin sponsored plans, in that if another participating employer ceases to contribute to a multiemployer plan, additional unfunded obligations may need to be funded over time by remaining participating employers.

12.    Commitments and Contingencies

Legal

Xcel Energy is involved in various litigation matters that are being defended and handled in the ordinary course of business. Assessing whether a loss is probable or a reasonable possibility, and whether the loss or a range of loss is estimable, often involves complex judgments regarding future events. Management maintains accruals for losses that are probable of being incurred and subject to reasonable estimation. Management may be unable to estimate an amount or range of a reasonably possible loss in certain situations, including when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate the ultimate liabilities, if any, arising from such current proceedings would have a material effect on Xcel Energy’s financial statements. Unless otherwise required by GAAP, legal fees are expensed as incurred.

Gas Trading Litigation —e prime is a wholly owned subsidiary of Xcel Energy. e prime was in the business of natural gas trading and marketing but has not engaged in natural gas trading or marketing activities since 2003.  Multiple lawsuits seeking monetary damages were commenced against e prime and its affiliates, including Xcel Energy, between 2003 and 2009 alleging fraud and anticompetitive activities in conspiring to restrain the trade of natural gas and manipulate natural gas prices. Cases were all consolidated in the U.S. District Court in Nevada.

In the fourth quarter of 2018, four cases were settled. Two cases remain active which include an MDL matter consisting of a Colorado class (Breckenridge) and a Wisconsin class (Arandell Corp.).

Breckenridge/Colorado— Case has been remanded to the MDL panel, and is expected to be referred back to the U.S. District Court in Colorado. Xcel Energy has concluded that a loss is remote.

Arandell Corp. — In November 2017, the U.S. District Court in Nevada granted summary judgment against two plaintiffs in the Arandell Corp. case in favor of Xcel Energy and NSP-Wisconsin, leaving only three individual plaintiffs remaining in the litigation. In addition, the plaintiffs’ motions for class certification and remand back to originating courts were denied in March 2017.

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Plaintiffs have asked the lower court to remand the cases back to the court where the actions were originally filed anticipating class certification. A hearing date has not been set. Xcel Energy has concluded that a loss is remote.

Line Extension Disputes — In December 2015, the DRC filed a lawsuit seeking monetary damages in the Denver District Court, stating PSCo failed to award proper allowances and refunds for line extensions to new developments pursuant to the terms of electric and gas service agreements. The dispute involves claims by over fifty developers. In February 2018, the Colorado Supreme Court denied DRC’s petition to appeal the Denver District Court’s dismissal of the lawsuit, effectively terminating this litigation. However, in January 2018, DRC filed a new lawsuit in Boulder County District Court, asserting a single claim that PSCo was required to file its line extension agreements with the CPUC but failed to do so.

This claim is substantially similar to the arguments previously raised by DRC. PSCo filed a motion to dismiss this claim, which was granted in May 2018. DRC subsequently filed an appeal to the Colorado Court of Appeals with its opening brief in January 2019 and PSCo filed its answer brief in February 2019. It is uncertain when a decision will be rendered.

PSCo has concluded that a loss is remote with respect to both of these matters as the service agreements were developed to implement CPUC approved tariffs and PSCo has complied with the tariff provisions. If a loss were sustained, PSCo believes it would be allowed to recover costs through traditional regulatory mechanisms. Amount or range in dispute is presently unknown and no accrual has been recorded for this matter.

Rate Matters

NSP-Minnesota — Sherco — In NSP-Minnesota’s 2013 fuel reconciliation filing, the MPUC made recovery of replacement power costs associated with the 2011 incident at its Sherco Unit 3 plant provisional and subject to further review following conclusion of litigation commenced by NSP-Minnesota, SMMPA (Co-owner of Sherco Unit 3) and insurance companies against GE.

In 2018, NSP-Minnesota and SMMPA reached a settlement with GE. NSP-Minnesota has notified the MPUC of its proposal to refund the GE settlement proceeds back to customers through the FCA.

The insurance providers continued their litigation against GE and the case went to trial. In 2018, GE prevailed in the lawsuit with the insurance companies, however, the jury found comparable fault, finding that GE was 52% and NSP-Minnesota was 48% at fault. At that point in the litigation, NSP-Minnesota was no longer involved in the case and was not present to make arguments about its role in the event. The specific issue leading to the fault apportionment was also not before the jury and not relevant to the outcome of the trial.

In January 2019, the DOC recommended that NSP-Minnesota refund $20 million of previously recovered purchased power costs to its customers, based on the jury’s apportionment of fault. The OAG recommended the MPUC withhold any decision until the underlying litigation by the insurance providers (currently under appeal) is concluded. The DOC subsequently filed comments agreeing with the OAG’s recommendation to withhold a decision pending the outcome of any appeals.

NSP-Minnesota filed reply comments arguing that the DOC recommendations are without merit and that it acted prudently in operating the plant and its settlement with GE was reasonable.

MISO ROE Complaints — In November 2013 and February 2015, customers filed complaints against MISO TOs including NSP-Minnesota and NSP-Wisconsin. The first complaint argued for a reduction in the base ROE in MISO transmission formula rates from 12.38% to 9.15%, and removal of ROE adders (including those for RTO membership).The second complaint sought to reduce base ROE from 12.38% to 8.67%.

In September 2016, the FERC issued an order granting a 10.32% base ROE (10.82% with the RTO adder) effective for the first complaint period of Nov. 12, 2013 to Feb. 11, 2015 and subsequent to the date of the order. The D.C. Circuit subsequently vacated and remanded FERC Opinion No. 531, which had established the ROE methodology on which the September 2016 FERC order was based.

In October 2018, the FERC issued a NETO base ROE order that addressed the D.C. Circuit’s actions on Opinion No. 531. Under a new proposed two step ROE approach, the FERC has indicated an intention to dismiss an ROE complaint if the existing ROE falls within the range of just and reasonable ROEs based on equal weighting of the DCF, CAPM, and Expected Earnings models. The FERC proposes that if necessary, it would then set a new ROE by averaging the results of these models plus a Risk Premium model.

With respect to the MISO TOs, the FERC subsequently made preliminary determinations in a November 2018 order that the MISO base ROE in effect for the first complaint period (12.38%) was outside the range of reasonableness, and should be reduced. The FERC indicated its preliminary analysis using the new ROE approach resulted in a base ROE of 10.28% for the first compliant period, compared to the previously ordered base ROE of 10.32%. A procedural schedule has been set for the first half of 2019, with the FERC expected to act no earlier than the second half of 2019. NSP-Minnesota has recognized a current refund liability consistent with its best estimate of the final ROE.

SPP OATT Upgrade Costs — Under the SPP OATT, costs of transmission upgrades may be recovered from other SPP customers whose transmission service depends on capacity enabled by the upgrade. The SPP OATT has allowed SPP to charge for these upgrades since 2008, but SPP had not been charging its customers for these upgrades. In 2016, the FERC granted SPP’s request to recover these previously unbilled charges. SPP subsequently billed SPS approximately $13 million for these charges.

In July 2018, SPS’ appeal to the D.C. Circuit over the FERC rulings granting SPP the right to recover these previously unbilled charges was remanded to the FERC. Assessment of these charges (from 2008 - 2016) is being reviewed by the FERC, which is expected to rule in the first quarter of 2019.

In October 2017, SPS filed a separate complaint against SPP asserting that SPP has assessed upgrade charges to SPS in violation of the SPP OATT. The FERC has granted a rehearing for further consideration in May 2018. The timing of FERC action on the SPS rehearing is uncertain. If SPS’ complaint results in additional charges or refunds, it will seek to recover or refund the differential in future rate proceedings.

Environmental

New and changing federal and state environmental mandates can create financial liabilities for Xcel Energy, which are normally recovered through the regulated rate process.

Site Remediation — Various federal and state environmental laws impose liability where hazardous substances or other regulated materials have been released to the environment. Xcel Energy Inc.’s subsidiaries may sometimes pay all or a portion of the cost to remediate sites where past activities of their predecessors or other parties have caused environmental contamination. Environmental contingencies could arise from various situations, including sites of former MGPs; and third-party sites, such as landfills, for which one or more of Xcel Energy Inc.’s subsidiaries are alleged to have sent wastes to that site.

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MGP Sites

Ashland MGP Site — NSP-Wisconsin was named a responsible party for contamination at the Ashland/Northern States Power Lakefront Superfund Site (the Site) in Ashland, Wisconsin. Remediation and restoration activities are anticipated to be completed in 2019 and groundwater treatment activities will continue for many years.

Current cost estimate for remediation of the entire site is approximately $192 million, of which approximately $165 million has been spent. As of Dec. 31, 2018 and 2017, NSP-Wisconsin recorded a total liability of $27 million and $30 million, respectively, for the entire site.

NSP-Wisconsin has deferred the unrecovered portion of the estimated Site remediation costs as a regulatory asset. The PSCW has authorized NSP-Wisconsin rate recovery for all remediation costs incurred at the Site. In 2012, the PSCW agreed to allow NSP-Wisconsin to pre-collect certain costs, to amortize costs over a 10-year period and to apply a 3% carrying cost to the unamortized regulatory asset.

MGP, Landfill or Disposal Sites — Xcel Energy is currently investigating or remediating twelve MGP, landfill or other disposal sites across its service territories, in addition to the Ashland MGP Site, and these activities will continue through at least 2019. Xcel Energy accrued $9 million as of Dec. 31, 2018 and $19 million as of Dec. 31, 2017 for these sites. There may be insurance recovery and/or recovery from other potentially responsible parties, offsetting a portion of the costs incurred.

Environmental Requirements — Water and Waste

Coal Ash Regulation —Xcel Energy’s operations are subject to federal and state laws that impose requirements for handling, storage, treatment and disposal of solid waste. In 2015, the EPA published the CCR Rule. Litigation was brought challenging the rule in the D.C. Circuit.

Under the CCR Rule, utilities are required to complete groundwater sampling around their CCR landfills and surface impoundments. Xcel Energy has identified at least two sites in Colorado where SSLs exist in the groundwater near landfills and/or impoundments. Xcel Energy has completed removal of CCR from these impoundments and plans to close these landfills. By the end of 2019, only nine of Xcel Energy’s regulated ash units are expected to be in operation. Xcel Energy is conducting additional groundwater sampling and will evaluate whether corrective action is required at any CCR landfills or surface impoundments.

Until Xcel Energy completes its assessment, it is uncertain what impact, if any, there will be on the operations, financial condition or cash flows. In August 2018, the D.C. Circuit ruled that the EPA cannot allow utilities to continue to use unlined impoundments (including clay lined impoundments) for the storage or disposal of coal ash. Litigation is ongoing regarding the deadline for closing or retrofitting these impoundments. The decision will require Xcel Energy to expedite closure of one impoundment in Minnesota (see ARO removal costs below) and will require construction of a new impoundment, which is estimated to cost $6 million.

Federal CWA WOTUS Rule —In 2015, the EPA and Corps published a final rule that significantly broadened the scope of waters under the CWA that are subject to federal jurisdiction, referred to as “WOTUS”. The Rule has been subject to significant litigation and is currently stayed in a portion of the country. Xcel Energy cannot estimate potential impacts until the legal and administrative processes are finalized, but expects costs will be recoverable through regulatory mechanisms.

Federal CWA ELG — In 2015, the EPA issued a final ELG rule for power plants that discharge treated effluent to surface waters as well as utility-owned landfills that receive CCRs. In 2017, the EPA delayed the compliance date for flue gas desulfurization wastewater and bottom ash transport until November 2020. After 2020, Xcel Energy estimates that ELG compliance will cost approximately $12 million to complete. The EPA, however, is conducting a rulemaking process to potentially revise the effluent limitations and pretreatment standards, which may impact compliance costs. Xcel Energy anticipates these costs will be fully recoverable through regulatory mechanisms.

Federal CWA Section 316(b) — The federal CWA requires the EPA to regulate cooling water intake structures to assure that these structures reflect the best technology available for minimizing impingement and entrainment of aquatic species. Xcel Energy estimates the likely cost for complying with impingement and entrainment requirements is approximately $40 million, to be incurred between 2019 and 2028. Xcel Energy believes six NSP-Minnesota plants and two NSP-Wisconsin plants could be required by state regulators to make improvements to reduce impingement and entrainment. The exact total cost of the impingement and entrainment improvements is uncertain, but could be up to approximately $200 million. Xcel Energy anticipates these costs will be fully recoverable through regulatory mechanisms.

Environmental Requirements — Air

Regional Haze Rules — The regional haze program requires SO₂, NO_X and PM emission controls at power plants to reduce visibility impairment in national parks and wilderness areas. The program includes BART and reasonable further progress.

The requirements of the first regional haze plans developed by Minnesota and Colorado have been approved and implemented. Texas’ first regional haze plan has undergone federal review as described below.

BART Determination for Texas: The EPA has issued a revised final rule adopting a BART alternative Texas only SO₂ trading program that applies to all Harrington and Tolk units. Under the trading program, SPS expects the allowance allocations to be sufficient for SO₂ emissions. The anticipated costs of compliance are not expected to have a material impact; and SPS believes that compliance costs would be recoverable through regulatory mechanisms.

Several parties have challenged whether the final rule issued by the EPA should be considered to have met the requirements imposed in a Consent Decree entered by the United States District Court for the District of Columbia that established deadlines for the EPA to take final action on state regional haze plan submissions. The court has required status reports from the parties while the EPA works on the reconsideration rulemaking.

In December 2017, the National Parks Conservation Association, Sierra Club, and Environmental Defense Fund appealed the EPA’s 2017 final BART rule to the Fifth Circuit and filed a petition for administrative reconsideration. In January 2018, the court granted SPS’ motion to intervene in the Fifth Circuit litigation in support of the EPA’s final rule. The court has held the litigation in abeyance while the EPA decided whether to reconsider the rule. In August 2018, the EPA started a reconsideration rulemaking. It is not known when the EPA will make a final decision on this proposal.

Reasonable Progress Rule: In 2016, the EPA adopted a final rule establishing a federal implementation plan for reasonable further progress under the regional haze program for the state of Texas. The rule imposes SO₂ emission limitations that would require the installation of dry scrubbers on Tolk Units 1 and 2, with compliance required by February 2021. Investment costs associated with dry scrubbers could be $600 million. SPS appealed the EPA’s decision and obtained a stay of the final rule.

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In March 2017, the Fifth Circuit remanded the rule to the EPA for reconsideration, leaving the stay in effect. In a future rulemaking, the EPA will address whether SO₂ emission reductions beyond those required in the BART alternative rule are needed at Tolk under the “reasonable progress” requirements. The EPA has not announced a schedule for acting on the remanded rule.

Implementation of the NAAQS for SO₂ — The EPA has designated all areas near SPS’ generating plants as attaining the SO₂ NAAQS with an exception. The EPA issued final designations which found the area near the SPS Harrington plant as “unclassifiable.” The area near the Harrington plant is to be monitored for three years and a final designation is expected to be made by December 2020.

If the area near the Harrington plant is designated nonattainment in 2020, the TCEQ will need to develop an implementation plan, designed to achieve the NAAQS by 2025. The TCEQ could require additional SO₂ controls at Harrington as part of such a plan. Xcel Energy cannot evaluate the impacts until the final designation is made and any required state plans are developed. Xcel Energy believes that should SO₂ control systems be required for a plant, compliance costs or the costs of alternative cost-effective generation will be recoverable through regulatory mechanisms and therefore does not expect a material impact on results of operations, financial condition or cash flows.

AROs — AROs have been recorded for Xcel Energy’s assets. For nuclear assets, the ARO is associated with the decommissioning of the NSP-Minnesota nuclear generating plants, Monticello and PI.

Aggregate fair value of NSP-Minnesota’s legally restricted assets, for funding future nuclear decommissioning, was $2.1 billion for 2018 and 2017.

Xcel Energy’s AROs were as follows:

	Dec. 31, 2018
(Millions  of Dollars)	Jan. 1, 2018		Amounts Incurred (a)		Amounts Settled (b)			Accretion		Cash Flow Revisions(c)			Dec. 31, 2018
Electric
Nuclear	$	1,874	$	—	$	—		$	94	$	—		$	1,968
Steam, hydro, and other production	192		—		(14		)	8		(9		)	177
Wind	96		12		—			4		7			119
Distribution	21		—		—			1		20			42
Miscellaneous	5		—		—			—		2			7
Natural gas
Transmission and distribution	282		—		—			13		(46		)	249
Miscellaneous	4		—		—			—		—			4
Common
Miscellaneous	1		—		—			—		—			1
Non-utility
Miscellaneous	—		1		—			—		—			1
Total liability	$	2,475	$	13	$	(14	)	$	120	$	(26	)	$	2,568

^(a)  Amounts incurred related to the PSCo Rush Creek wind farm and Nicollet Projects community solar gardens, which were placed in service in 2018.

^(b)  Amounts settled related to asbestos abatement projects and closure of certain ash containment facilities.

^(c)  In 2018, AROs were revised for changes in timing and estimates of cash flows. Changes in gas transmission and distribution AROs were primarily related to increased gas line mileage and number of services, which were more than offset by increased discount rates. Changes in electric distribution AROs primarily related to increased labor costs.

	Dec. 31, 2017
(Millions  of Dollars)	Jan. 1, 2017		Amounts Incurred		Amounts Settled(a)			Accretion		Cash Flow Revisions(b)			Dec. 31, 2017
Electric
Nuclear	$	2,249	$	—	$	—		$	114	$	(489	)	$	1,874
Steam, hydro, and other production	205		1		(29		)	9		6			192
Wind	92		—		—			4		—			96
Distribution	20		—		—			1		—			21
Miscellaneous	5		—		—			—		—			5
Natural gas
Transmission and distribution	205		—		—			8		69			282
Miscellaneous	4		—		—			—		—			4
Common
Miscellaneous	2		—		(1		)	—		—			1
Total liability	$	2,782	$	1	$	(30	)	$	136	$	(414	)	$	2,475

^(a)  Amounts settled related to asbestos abatement, closure of ash containment facilities, and removal and disposal of storage tanks and other above ground equipment.

^(b)  In 2017, AROs were revised for changes in timing and estimates of cash flows. Nuclear AROs decreased due to updated assumptions. Changes in gas transmission and distribution AROs were primarily related to increased labor costs.

Indeterminate AROs — Other plants or buildings may contain asbestos due to the age of many of Xcel Energy’s facilities, but no confirmation or measurement of the cost of removal could be determined as of Dec. 31, 2018. Therefore, an ARO was not recorded for these facilities.

Removal Costs — Xcel Energy records a regulatory liability for the plant removal costs of its utility subsidiaries that are recovered currently in rates. Removal costs have accumulated based on varying rates as authorized by the appropriate regulatory entities. The utility subsidiaries have estimated the amount of removal costs accumulated through historic depreciation expense based on current factors used in the existing depreciation rates.

Accumulated balances by entity at Dec. 31:

(Millions of Dollars)	2018		2017
NSP-Minnesota	$	485	$	442
PSCo	344		346
SPS	188		197
NSP-Wisconsin	158		146
Total Xcel Energy	$	1,175	$	1,131

Nuclear Related

Nuclear Insurance — NSP-Minnesota’s public liability for claims from any nuclear incident is limited to $14.1 billion under the Price-Anderson amendment to the Atomic Energy Act. NSP-Minnesota has secured $450 million of coverage for its public liability exposure with a pool of insurance companies. The remaining $13.6 billion of exposure is funded by the Secondary Financial Protection Program, available from assessments by the federal government.

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NSP-Minnesota is subject to assessments of up to $138 million per reactor-incident for each of its three licensed reactors, for public liability arising from a nuclear incident at any licensed nuclear facility in the United States. The maximum funding requirement is $21 million per reactor-incident during any one year. Maximum assessments are subject to inflation adjustments by the NRC and state premium taxes. The NRC’s last adjustment was effective November 2018.

NSP-Minnesota purchases insurance for property damage and site decontamination cleanup costs from NEIL and EMANI. The coverage limits are $2.3 billion for each of NSP-Minnesota’s two nuclear plant sites. NEIL also provides business interruption insurance coverage, including the cost of replacement power during prolonged accidental outages of nuclear generating units. Premiums are expensed over the policy term.

All companies insured with NEIL are subject to retroactive premium adjustments if losses exceed accumulated reserve funds. Capital has been accumulated in the reserve funds of NEIL and EMANI to the extent that NSP-Minnesota would have no exposure for retroactive premium assessments in case of a single incident under the business interruption and the property damage insurance coverage. NSP-Minnesota could be subject to annual maximum assessments of approximately $18 million for business interruption insurance and $39 million for property damage insurance if losses exceed accumulated reserve funds.

Nuclear Fuel Disposal — NSP-Minnesota is responsible for temporarily storing spent nuclear fuel from its nuclear plants. The DOE is responsible for permanently storing spent fuel from U.S. nuclear plants, but no such facility is yet available.

NSP-Minnesota owns temporary on-site storage facilities for spent fuel at its Monticello and PI nuclear plants, which consist of storage pools and dry cask facilities. The Monticello dry-cask storage facility currently stores all 30 of the authorized canisters. The PI dry-cask storage facility currently stores 44 of the 64 authorized casks. Monticello’s future spent fuel will continue to be placed in its spent fuel pool. The decommissioning plan addresses the disposition of spent fuel at the end of the licensed life.

Regulatory Plant Decommissioning Recovery — Decommissioning activities for NSP-Minnesota’s nuclear facilities are planned to begin at the end of each unit’s operating license and be completed by 2091. NSP-Minnesota’s current operating licenses allow continued use of its Monticello nuclear plant until 2030 and its PI nuclear plant until 2033 for Unit 1 and 2034 for Unit 2.

Future decommissioning costs of nuclear facilities are estimated through triennial periodic studies that assess the costs and timing of planned nuclear decommissioning activities for each unit.

Obligation for decommissioning is expected to be funded 100% by the external decommissioning trust fund. This cost study assumes the external decommissioning fund will earn an after-tax return between 5.23% and 6.30% Realized and unrealized gains on fund investments are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Decommissioning costs are quantified in 2014 dollars. Escalation rates are 4.36% for plant removal activities and 3.36% for fuel management and site restoration activities.

NSP-Minnesota has accumulated $2.1 billion of assets held in external decommissioning trusts in 2018. The following table summarizes the funded status of NSP-Minnesota’s decommissioning obligation. Xcel Energy believes future decommissioning costs will continue to be recovered in customer rates. The following amounts were prepared on a regulatory basis and not directly recorded in the financial statements (ARO).

	Regulatory Basis
(Millions of Dollars)	2018			2017
Estimated decommissioning cost obligation from most recently approved study (in 2014 dollars)	$	3,012		$	3,012
Effect of escalating costs	539			396
Estimated decommissioning cost obligation (in current dollars)	3,551			3,408
Effect of escalating costs to payment date	7,654			7,797
Estimated future decommissioning costs (undiscounted)	11,205			11,205
Effect of discounting obligation (using average risk-free interest rate of 3.33% and 2.80% for 2018 and 2017, respectively)	(6,911		)	(6,398		)
Discounted decommissioning cost obligation	$	4,294		$	4,807
Assets held in external decommissioning trust	$	2,055		$	2,143
Underfunding of external decommissioning fund compared to the discounted decommissioning obligation	2,239			2,664

Calculations and data used by the regulator in approving NSP-Minnesota’s rates are useful in assessing future cash flows. Regulatory basis information is a means to reconcile amounts previously provided to the MPUC and utilized for regulatory purposes to amounts used for financial reporting.

Reconciliation of the discounted decommissioning cost obligation - regulated basis to the ARO recorded in accordance with GAAP:

(Millions of Dollars)	2018			2017
Discounted decommissioning cost obligation - regulated basis	$	4,294		$	4,807
Differences in discount rate and market risk premium	(1,447		)	(1,403		)
O&M costs not included for GAAP	(879		)	(1,041		)
ARO differences between 2017 and 2014 cost studies	—			(489		)
Nuclear production decommissioning ARO - GAAP	$	1,968		$	1,874

Decommissioning expenses recognized as a result of regulation:

(Millions of Dollars)	2018		2017		2016
Annual decommissioning recorded as depreciation expense: (a) (b)	$	20	$	20	$	20

^(a)  Decommissioning expense does not include depreciation of the capitalized nuclear asset retirement costs.

^(b)  Decommissioning expenses in 2018, 2017 and 2016 include Minnesota’s retail jurisdiction annual funding requirement of approximately $14 million.

The 2014 nuclear decommissioning filing, approved in 2015, was used for regulatory presentation in 2018, 2017 and 2016. The 2017 filing, effective Jan. 1, 2019, has been approved by the MPUC.

Leases — Xcel Energy has three leases accounted for as capital leases. The assets and liabilities of a capital lease are recorded at the lower of fair market value of the leased asset or the present value of future lease payments and are amortized over the term of the contract.

WYCO is a joint venture with CIG to develop and lease natural gas pipeline, storage and compression facilities. Xcel Energy Inc. has a 50% ownership interest in WYCO. WYCO leases its facilities to CIG, and CIG operates the facilities, providing natural gas storage and transportation services to PSCo under separate service agreements.

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PSCo accounts for its Totem natural gas storage service arrangement with CIG as a capital lease. Xcel Energy Inc. eliminates 50% of the capital lease obligation related to WYCO in the consolidated balance sheet along with an equal amount of Xcel Energy Inc.’s equity investment in WYCO.

PSCo records amortization for its capital lease assets as electric fuel and purchased power and cost of natural gas sold and transported on the consolidated statements of income.

Property held under capital leases:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
Gas storage facilities	$	201		$	201
Gas pipeline	21			21
Property held under capital leases	222			222
Accumulated depreciation	(77		)	(71		)
Total property held under capital leases, net	$	145		$	151

Remaining leases, primarily for real estate and certain natural gas generating facilities operated under PPAs, as well as railcars, aircraft and other equipment, are accounted for as operating leases.

Total expenses (including capacity payments) under operating lease obligations for Xcel Energy and the corresponding capacity payments for PPAs accounted for as operating leases for the year ended Dec. 31:

(Millions of Dollars)	2018		2017		2016
Total expense	$	248	$	246	$	255
Capacity payments	210		210		216

Included in the future commitments under operating leases are estimated future capacity payments under PPAs that have been accounted for as operating leases.

Future commitments under operating and capital leases:

(Millions of Dollars)	Operating Leases		PPA (a) (b) Operating Leases		Total Operating Leases		Capital Leases
2019	$	32	$	207	$	239	$	14
2020	26		208		234		14
2021	25		210		235		14
2022	24		197		221		12
2023	22		186		208		12
Thereafter	154		883		1,037		220
Total minimum obligation							286
Interest component of obligation							(201		)
Present value of minimum obligation							$	85		(c)

^(a)  Amounts do not include PPAs accounted for as executory contracts.

^(b)  PPA operating leases contractually expire through 2034.

^(c)  Excludes certain amounts related to Xcel Energy’s 50% ownership interest in WYCO.

Non-Lease PPAs— NSP Minnesota, PSCo and SPS have entered into PPAs with other utilities and energy suppliers with expiration dates through 2039 for purchased power to meet system load and energy requirements, meet operating reserve obligations and as part of wholesale and commodity trading activities. In general, these agreements provide for energy payments, based on actual energy delivered and capacity payments. Certain PPAs accounted for as executory contracts contain minimum energy purchase commitments.

Capacity and energy payments are contingent on the IPPs meeting contract obligations, including plant availability requirements. Certain contractual payments are adjusted based on market indices. The effects of price adjustments on our financial results are mitigated through purchased energy cost recovery mechanisms.

Included in electric fuel and purchased power expenses for PPAs accounted for as executory contracts were payments for capacity of $131 million, $168 million and $191 million in 2018, 2017 and 2016, respectively.

At Dec. 31, 2018, the estimated future payments for capacity and energy that the utility subsidiaries of Xcel Energy are obligated to purchase pursuant to these executory contracts, subject to availability, were as follows:

(Millions of Dollars)	Capacity		Energy (a)
2019	$	86	$	99
2020	70		109
2021	78		157
2022	77		173
2023	79		177
Thereafter	125		328
Total	$	515	$	1,043

^(a)  Excludes contingent energy payments for renewable energy PPAs.

Fuel Contracts — Xcel Energy has entered into various long-term commitments for the purchase and delivery of a significant portion of its coal, nuclear fuel and natural gas requirements. These contracts expire between 2019 and 2060. Xcel Energy is required to pay additional amounts depending on actual quantities shipped under these agreements.

Estimated minimum purchases under these contracts as of Dec. 31, 2018:

(Millions of Dollars)	Coal		Nuclear fuel		Natural gas supply		Natural gas supply and transportation
2019	$	461	$	127	$	416	$	268
2020	260		51		263		255
2021	149		99		254		245
2022	109		79		114		234
2023	61		99		60		170
Thereafter	108		337		—		923
Total	$	1,148	$	792	$	1,107	$	2,095

VIEs

PPAs—Under certain PPAs, NSP-Minnesota, PSCo and SPS purchase power from IPPs for which the utility subsidiaries are required to reimburse fuel costs, or to participate in tolling arrangements under which the utility subsidiaries procure the natural gas required to produce the energy that they purchase. Xcel Energy has determined that certain IPPs are VIEs. Xcel Energy is not subject to risk of loss from the operations of these entities, and no significant financial support is required other than contractual payments for energy and capacity.

In addition, certain solar PPAs provide an option to purchase emission allowances or sharing provisions related to production credits generated by the solar facility under contract. These specific PPAs create a variable interest in the IPP.

Xcel Energy evaluated each of these VIEs for possible consolidation, including review of qualitative factors such as the length and terms of the contract, control over O&M, control over dispatch of electricity, historical and estimated future fuel and electricity prices, and financing activities.

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Xcel Energy concluded that these entities are not required to be consolidated in its consolidated financial statements because it does not have the power to direct the activities that most significantly impact the entities’ economic performance. Xcel Energy’s utility subsidiaries had approximately 3,770 MW and 3,537 MW of capacity under long-term PPAs at Dec. 31, 2018 and 2017, respectively, with entities that have been determined to be VIEs. Agreements have expiration dates through 2041.

Fuel Contracts — SPS purchases all of its coal requirements for its Harrington and Tolk plants from TUCO under contracts that will expire in December 2022. TUCO arranges for the purchase, receiving, transporting, unloading, handling, crushing, weighing and delivery of coal to meet SPS’ requirements. TUCO is responsible for negotiating and administering contracts with coal suppliers, transporters and handlers.

SPS has not provided any significant financial support to TUCO, other than contractual payments for delivered coal. However, the fuel contracts create a variable interest in TUCO due to SPS’ reimbursement of fuel procurement costs. SPS has determined that TUCO is a VIE. SPS has concluded that it is not the primary beneficiary of TUCO because SPS does not have the power to direct the activities that most significantly impact TUCO’s economic performance.

Low-Income Housing Limited Partnerships — Eloigne and NSP-Wisconsin have entered into limited partnerships for the construction and operation of affordable rental housing developments which qualify for low-income housing tax credits. Xcel Energy Inc. has determined Eloigne and NSP-Wisconsin’s low-income housing partnerships to be VIEs primarily due to contractual arrangements within each limited partnership that establish sharing of ongoing voting control and profits and losses that does not align with the partners’ proportional equity ownership. Eloigne and NSP-Wisconsin have the power to direct the activities that most significantly impact these entities’ economic performance. Therefore, Xcel Energy Inc. consolidates these limited partnerships in its consolidated financial statements. Xcel Energy’s risk of loss for these partnerships is limited to its capital contributions, adjusted for any distributions and its share of undistributed profits and losses; no significant additional financial support has been, or is required to be provided to the limited partnerships by Eloigne or NSP-Wisconsin.

Amounts reflected in Xcel Energy’s consolidated balance sheets for the Eloigne and NSP-Wisconsin low-income housing limited partnerships:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Current assets	$	5	$	6
Property, plant and equipment, net	42		46
Other noncurrent assets	1		1
Total assets	$	48	$	53
Current liabilities	$	7	$	9
Mortgages and other long-term debt payable	26		26
Other noncurrent liabilities	—		1
Total liabilities	$	33	$	36

Other

Technology Agreements — Xcel Energy has a contract that extends through December 2022 with IBM for information technology services. Contract is cancelable at Xcel Energy’s option, although Xcel Energy would be obligated to pay 50% of the contract value for early termination. Xcel Energy capitalized or expensed $81 million, $98 million and $119 million associated with the IBM contract in 2018, 2017 and 2016, respectively.

Xcel Energy’s contract with Accenture for information technology services extends through December 2020. Contract is cancelable at Xcel Energy’s option, although there are financial penalties for early termination. Xcel Energy capitalized or expensed $46 million, $16 million and $35 million associated with the Accenture contract in 2018, 2017 and 2016, respectively.

Committed minimum payments under these obligations:

(Millions of Dollars)	IBM Agreement		Accenture Agreement
2019	$	30	$	11
2020	16		11
2021	16		—
2022	7		—
2023	—		—
Thereafter	—		—

Guarantees and Bond Indemnifications —Xcel Energy Inc. and its subsidiaries enter into contractual guarantees in limited circumstances. Xcel Energy Inc. may guarantee the subsidiaries’ obligations in the event they fail to perform and may provide guarantees in certain indemnification agreements. Xcel Energy Inc.’s guarantees from the subsidiaries are not individually material with maximum potential liability totaling $6 million as of Dec. 31, 2018. Payment for these guarantees is considered remote.

13.    Other Comprehensive Income

Changes in accumulated other comprehensive (loss), net of tax, for the years ended Dec. 31:

	2018
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges				Defined Benefit Pension and Postretirement Items				Total
Accumulated other comprehensive loss at Jan. 1	$	(58	)		$	(67	)		$	(125	)
Other comprehensive loss before reclassifications (net of taxes of $(2) and $(2), respectively)	(5		)		(6		)		(11		)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $1 and $0, respectively)	3			(a)	—				3
Amortization of net actuarial loss (net of taxes of $0 and $3, respectively)	—				9			(b)	9
Net current period other comprehensive income (loss)	(2		)		3				1
Accumulated other comprehensive loss at Dec. 31	$	(60	)		$	(64	)		$	(124	)

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	2017
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges				Defined Benefit Pension and Postretirement Items				Total
Accumulated other comprehensive loss at Jan. 1	$	(51	)		$	(59	)		$	(110	)
Other comprehensive loss before reclassifications (net of taxes of $0 and $(2), respectively)	—				(3		)		(3		)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $2 and $0, respectively)	3			(a)	—				3
Amortization of net actuarial loss (net of taxes of $0 and $5, respectively)	—				7			(b)	$	7
Net current period other comprehensive income	3				4				7
Adoption of ASU No. 2018-02 (c)	(10		)		(12		)		(22		)
Accumulated other comprehensive loss at Dec. 31	$	(58	)		$	(67	)		$	(125	)

^(a)  Included in interest charges.

^(b)  Included in the computation of net periodic pension and postretirement benefit costs.

^(c)  In 2017, Xcel Energy implemented ASU No. 2018-02 related to the TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.

14.    Segments and Related Information

Regulated electric utility operating results of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS, as well as the regulated natural gas utility operating results of NSP-Minnesota, NSP-Wisconsin and PSCo are each separately and regularly reviewed by Xcel Energy’s chief operating decision maker. Xcel Energy evaluates performance by each utility subsidiary based on profit or loss generated from the product or service provided. These segments are managed separately because the revenue streams are dependent upon regulated rate recovery, which is separately determined for each segment.

Xcel Energy has the following reportable segments:

• Regulated Electric - The regulated electric utility segment generates, transmits and distributes electricity in Minnesota, Wisconsin, Michigan, North Dakota, South Dakota, Colorado, Texas and New Mexico. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. The regulated electric utility segment also includes wholesale commodity and trading operations.

• Regulated Natural Gas - The regulated natural gas utility segment transports, stores and distributes natural gas primarily in portions of Minnesota, Wisconsin, North Dakota, Michigan and Colorado.

• All Other - Operating segments with revenues below the necessary quantitative thresholds are included in this category. Those segments primarily include steam revenue, appliance repair services, non-utility real estate activities, revenues associated with processing solid waste into refuse-derived fuel and investments in rental housing projects that qualify for low-income housing tax credits.

Xcel Energy had equity investments in unconsolidated subsidiaries of $141 million and $140 million as of Dec. 31, 2018 and 2017, respectively, included in the natural gas utility and all other segments.

Asset and capital expenditure information is not provided for Xcel Energy’s reportable segments. As an integrated electric and natural gas utility, Xcel Energy operates significant assets that are not dedicated to a specific business segment. Reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.

Certain costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators across each segment. In addition, a general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

Xcel Energy’s segment information:

(Millions of Dollars)	2018			2017			2016
Regulated Electric
Operating revenues from external customers	$	9,719		$	9,676		$	9,500
Intersegment revenue	1			2			1
Total revenues	$	9,720		$	9,678		$	9,501
Depreciation and amortization	1,421			1,298			1,136
Interest charges and financing costs	449			449			450
Income tax expense	187			528			567
Net income	1,177			1,066			1,067
Regulated Natural Gas
Operating revenues from external customers	$	1,739		$	1,650		$	1,531
Intersegment revenue	2			1			1
Total revenues	$	1,741		$	1,651		$	1,532
Depreciation and amortization	212			174			160
Interest charges and financing costs	61			57			54
Income tax expense	28			23			76
Net income	187			182			124
All Other
Total operating revenue	$	79		$	78		$	76
Depreciation and amortization	9			7			7
Interest charges and financing costs	142			122			116
Income tax (benefit)	(34		)	(9		)	(62		)
Net (loss)	(103		)	(100		)	(68		)
Consolidated Total
Total revenue	$	11,540		$	11,407		$	11,109
Reconciling eliminations	(3		)	(3		)	(2		)
Consolidated total revenue	$	11,537		$	11,404		$	11,107
Depreciation and amortization	1,642			1,479			1,303
Interest charges and financing costs	652			628			620
Income tax expense	181			542			581
Net income	1,261			1,148			1,123

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15.    Summarized Quarterly Financial Data (Unaudited)

	Quarter Ended
(Amounts in millions, except per share data)	March 31, 2018		June 30, 2018		Sept. 30, 2018		Dec. 31, 2018
Operating revenues	$	2,951	$	2,658	$	3,048	$	2,880
Operating income (a)	480		450		696		339
Net income	291		265		491		214
EPS total — basic	$	0.57	$	0.52	$	0.96	$	0.42
EPS total — diluted	0.57		0.52		0.96		0.42
Cash dividends declared per common share	0.38		0.38		0.38		0.38

	Quarter Ended
(Amounts in millions, except per share data)	March 31, 2017		June 30, 2017		Sept. 30, 2017		Dec. 31, 2017
Operating revenues	$	2,946	$	2,645	$	3,017	$	2,796
Operating income (a)	492		466		824		440
Net income	239		227		492		189
EPS total — basic	$	0.47	$	0.45	$	0.97	$	0.37
EPS total — diluted	0.47		0.45		0.97		0.37
Cash dividends declared per common share	0.36		0.36		0.36		0.36

^(a)  In 2018, Xcel Energy implemented ASU No. 2017-07 related to net periodic benefit cost, which resulted in retrospective reclassification of pension costs from O&M expense to other income.

Item 9 — Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A—Controls and Procedures

Disclosure Controls and Procedures

Xcel Energy maintains a set of disclosure controls and procedures designed to ensure that information required to be disclosed in reports that it files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms. In addition, the disclosure controls and procedures ensure that information required to be disclosed is accumulated and communicated to management, including the chief executive officer and chief financial officer, allowing timely decisions regarding required disclosure. As of Dec. 31, 2018, based on an evaluation carried out under the supervision and with the participation of Xcel Energy’s management, including the chief executive officer and chief financial officer, of the effectiveness of its disclosure controls and the procedures, the chief executive officer and chief financial officer have concluded that Xcel Energy’s disclosure controls and procedures were effective.

Internal Control Over Financial Reporting

No change in Xcel Energy’s internal control over financial reporting has occurred during the most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, Xcel Energy’s internal control over financial reporting. Xcel Energy maintains internal control over financial reporting to provide reasonable assurance regarding the reliability of the financial reporting.

Xcel Energy has evaluated and documented its controls in process activities, general computer activities, and on an entity-wide level. During the year and in preparation for issuing its report for the year ended Dec. 31, 2018 on internal controls under section 404 of the Sarbanes-Oxley Act of 2002, Xcel Energy conducted testing and monitoring of its internal control over financial reporting. Based on the control evaluation, testing and remediation performed, Xcel Energy did not identify any material control weaknesses, as defined under the standards and rules issued by the Public Company Accounting Oversight Board and as approved by the SEC and as indicated in Management Report on Internal Controls herein.

Item 9B — Other Information

None.

PART III

Item 10 — Directors, Executive Officers and Corporate Governance

Information required under this Item with respect to Directors and Corporate Governance is set forth in Xcel Energy Inc.’s Proxy Statement for its 2019 Annual Meeting of Shareholders, which is incorporated by reference. Information with respect to Executive Officers is included in Item 1 to this report.

Item 11 — Executive Compensation

Information required under this Item is set forth in Xcel Energy Inc.’s Proxy Statement for its 2019 Annual Meeting of Shareholders, which is incorporated by reference.

Item 12 — Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Information required under this Item is contained in Xcel Energy Inc.’s Proxy Statement for its 2019 Annual Meeting of Shareholders, which is incorporated by reference.

Item 13 — Certain Relationships and Related Transactions, and Director Independence

Information required under this Item is contained in Xcel Energy Inc.’s Proxy Statement for its 2019 Annual Meeting of Shareholders, which is incorporated by reference.

Item 14 — Principal Accountant Fees and Services

Information required under this Item is contained in Xcel Energy Inc.’s Proxy Statement for its 2019 Annual Meeting of Shareholders, which is incorporated by reference.

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PART IV

Item 15 — Exhibits, Financial Statement Schedules

1	Consolidated Financial Statements
	Management Report on Internal Controls Over Financial Reporting — For the year ended Dec. 31, 2018.
	Report of Independent Registered Public Accounting Firm — Financial Statements
	Report of Independent Registered Public Accounting Firm — Internal Controls Over Financial Reporting
	Consolidated Statements of Income — For the three years ended Dec. 31, 2018, 2017, and 2016.
	Consolidated Statements of Comprehensive Income — For the three years ended Dec. 31, 2018, 2017, and 2016.
	Consolidated Statements of Cash Flows — For the three years ended Dec. 31, 2018, 2017, and 2016.
	Consolidated Balance Sheets — As of Dec. 31, 2018 and 2017.
	Consolidated Statements of Common Stockholders’ Equity — For the three years ended Dec. 31, 2018, 2017, and 2016.
2	Schedule I — Condensed Financial Information of Registrant.
	Schedule II — Valuation and Qualifying Accounts and Reserves for the years ended Dec. 31, 2018, 2017 and 2016.
3	Exhibits
*	Indicates incorporation by reference
+	Executive Compensation Arrangements and Benefit Plans Covering Executive Officers and Directors
Xcel Energy Inc.
Exhibit Number	Description	Report or Registration Statement	SEC File or Registration Number	Exhibit Reference
3.01*	Amended and Restated Articles of Incorporation of Xcel Energy Inc.	Xcel Energy Inc Form 8-K dated May 16, 2012	001-03034	3.01
3.02*	Bylaws of Xcel Energy Inc.	Xcel Energy Inc Form 8-K dated Feb. 17, 2016	001-03034	3.01
4.01*	Indenture dated Dec. 1, 2000 between Xcel Energy Inc. and Wells Fargo Bank Minnesota, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated Dec. 14, 2000	001-03034	4.01
4.02*	Supplemental Indenture No. 3 dated June 1, 2006 between Xcel Energy Inc. and Wells Fargo Bank, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated June 6, 2006	001-03034	4.01
4.03*	Junior Subordinated Indenture, dated as of Jan. 1, 2008, by and between Xcel Energy Inc. and Wells Fargo Bank, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated Jan. 16, 2008	001-03034	4.01
4.04*	Replacement Capital Covenant, dated Jan. 16, 2008	Xcel Energy Inc. Form 8-K dated Jan. 16, 2008	001-03034	4.03
4.05*	Supplemental Indenture No. 5, dated as of May 1, 2010 between Xcel Energy Inc. and Wells Fargo Bank, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated May 10, 2010	001-03034	4.01
4.06*	Supplemental Indenture No. 6, dated as of Sept. 1, 2011 between Xcel Energy Inc. and Wells Fargo Bank, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated Sept. 12, 2011	001-03034	4.01
4.07*	Supplemental Indenture No. 8, dated as of June 1, 2015 between Xcel Energy Inc. and Wells Fargo Bank, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated June 1, 2015	001-03034	4.01
4.08*	Supplemental Indenture No. 9, dated as of March 1, 2016, by and between Xcel Energy Inc. and Wells Fargo Bank, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated March 8, 2016	001-03034	4.02
4.09*	Supplemental Indenture No. 10, dated as of Dec. 1, 2016, by and between Xcel Energy Inc. and Wells Fargo Bank, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated Dec. 1, 2016	001-03034	4.01
4.10*	Supplemental Indenture No. 11, dated as of June 25, 2018, by and between Xcel Energy Inc. and Wells Fargo Bank, National Association, as Trustee	Xcel Energy Inc. Form 8-K dated June 25, 2018	001-03034	4.01
10.01*	Xcel Energy Inc. Nonqualified Pension Plan (2009 Restatement)	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2008	001-03034	10.02
10.02*+	Xcel Energy Senior Executive Severance and Change-in-Control Policy (2009 Restatement)	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2008	001-03034	10.05
10.03*+	Xcel Energy Inc. Non-Employee Directors Deferred Compensation Plan as amended and restated Jan. 1, 2009	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2008	001-03034	10.08
10.04*+	Form of Services Agreement between Xcel Energy Services Inc. and utility companies	Xcel Energy Inc. Form U5B dated Nov. 16, 2000	001-03034	H-1
10.05*+	Xcel Energy Inc. Supplemental Executive Retirement Plan as amended and restated Jan. 1, 2009	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2008	001-03034	10.17
10.06*+	First Amendment to Exhibit 10.02 dated Aug. 26, 2009	Xcel Energy Inc. Form 10-Q for the quarter ended Sept. 30, 2009	001-03034	10.06
10.07*+	Xcel Energy Inc. Executive Annual Incentive Award Plan Form of Restricted Stock Agreement	Xcel Energy Inc. Form 10-Q for the quarter ended Sept. 30, 2009	001-03034	10.08
10.08*+	Xcel Energy Inc. Executive Annual Incentive Plan (as amended and restated effective Feb. 17, 2010)	Xcel Energy Inc. Definitive Proxy Statement dated April 6, 2010	001-03034	Schedule 14A

79

10.09*+	Xcel Energy Inc. 2005 Long-Term Incentive Plan (as amended and restated effective Feb. 17, 2010)	Xcel Energy Inc. Definitive Proxy Statement dated April 6, 2010	001-03034	Schedule 14A
10.10*+	Stock Equivalent Plan for Non-Employee Directors of Xcel Energy Inc. as amended and restated effective Feb. 23, 2011	Xcel Energy Inc. Definitive Proxy Statement dated April 5, 2011	001-03034	Schedule 14A
10.11*+	Xcel Energy Inc. Nonqualified Deferred Compensation Plan (2009 Restatement)	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2008	001-03034	10.07
10.12*+	First Amendment to Exhibit 10.11 effective Nov. 29, 2011	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2011	001-03034	10.17
10.13*+	Second Amendment to Exhibit 10.02 dated Oct. 26, 2011	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2011	001-03034	10.18
10.14*+	First Amendment to Exhibit 10.08 dated Feb. 20, 2013	Xcel Energy Inc. Form 10-Q for the quarter ended March 31, 2013	001-03034	10.01
10.15*+	Fourth Amendment to Exhibit 10.02 dated Feb. 20, 2013	Xcel Energy Inc. Form 10-Q for the quarter ended March 31, 2013	001-03034	10.02
10.16*+	First Amendment to Exhibit 10.09 dated May 21, 2013	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2013	001-03034	10.21
10.17*+	Second Amendment to Exhibit 10.11 dated May 21, 2013	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2013	001-03034	10.22
10.18*+	Xcel Energy Inc. 2005 Long-Term Incentive Plan Form of Long-Term Incentive Award Agreement	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2013	001-03034	10.23
10.19*+	Xcel Energy Inc. 2015 Omnibus Incentive Plan	Xcel Energy Inc. Definitive Proxy Statement dated April 6, 2015	001-03034	Schedule 14A
10.20*+	Stock Equivalent Program for Non-Employee Directors of Xcel Energy Inc. under the Xcel Energy Inc. 2015 Omnibus Incentive Plan	Xcel Energy Inc. Form 8-K dated May 20, 2015	001-03034	10.02
10.21*	Form of Xcel Energy Inc. 2015 Omnibus Incentive Plan Award Agreement and Award Terms and Conditions under the Xcel Energy Inc. 2015 Omnibus Incentive Plan	Xcel Energy Inc. Form 8-K dated May 20, 2015	001-03034	10.03
10.22*+	Xcel Energy Inc. 2015 Omnibus Incentive Plan Form of Award Agreement	Xcel Energy inc. Form 10-K for the year ended Dec. 31, 2015	001-03034	10.28
10.23*+	Xcel Energy Inc. Executive Annual Incentive Award Sub-plan pursuant to the Xcel Energy Inc. 2015 Omnibus Incentive Plan	Xcel Energy inc. Form 10-K for the year ended Dec. 31, 2015	001-03034	10.29
10.24*+	Fifth Amendment Exhibit 10.02 dated May 3, 2016	Xcel Energy Inc. Form 10-Q for the quarter ended June 30, 2016	001-03034	10.01
10.25*	Second Amendment and Restated Credit Agreement, dated as of June 20, 2016 among Xcel Energy Inc., as borrower, the several lenders from time to time parties thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, Bank of America, N.A., and Barclays Bank Plc, as Syndication Agents, and Wells Fargo Bank, National Association and the Bank of Tokyo-Mitsubishi UFJ, Ltd. , as Document Agents	Xcel Energy Inc. Form 8-K dated June 20, 2016	001-03034	99.01
10.26*+	Third Amendment to Exhibit 10.11 dated Sept. 30, 2016	Xcel Energy inc. Form 10-Q for the quarter ended Sept. 30, 2016	001-03034	10.01
10.27*+	Form of Xcel Energy, Inc. 2015 Omnibus Incentive Plan Award Agreement and Award Terms and Conditions under the Xcel Energy Inc. 2015 Omnibus Incentive Plan	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2016	001-03034	10.27
10.28*+	Fourth Amendment to Exhibit 10.11 dated Oct. 23, 2017	Xcel Energy Inc. Form 10-Q for the quarter ended Sept. 30, 2017	001-03034	10.1
10.29*	364-Day Term Loan Agreement dated Dec. 5, 2017 among Xcel Energy Inc., as Borrower, the several lenders from time to time parties thereto, and The Bank of Tokyo-Mitsubishi UFJ, Ltd., as Administrative Agent	Xcel Energy Inc. Form 8-K dated Dec. 5, 2017	001-03034	99.01
10.30*+	Sixth Amendment to Exhibit 10.02 dated Feb. 22, 2018	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2017	001-03034	10.30
10.31*+	Seventh Amendment to Exhibit 10.02 dated May 7, 2018	Xcel Energy Inc. Form 10-Q for the quarter ended June 30, 2018	001-03034	10.01
10.32*	Forward Sale Agreement, dated Nov. 7, 2018, between Xcel Energy Inc. and Morgan Stanley &Co., LLC	Xcel Energy Inc. Form 8-K dated Nov. 7, 2018	001-03034	10.01
10.33*	Amended and Restated 364-Day Term Loan Agreement dated as of Dec. 4, 2018 among Xcel Energy Inc., as Borrower, the several lenders from time to time parties thereto, and MUFG Bank, Ltd. as Administrative Agent.	Xcel Energy Inc. Form 8-K dated Dec. 4, 2018	001-03034	99.01
10.34+	Xcel Energy Inc. Amended and Restated 2015 Omnibus Incentive Plan
10.35+	Form of Xcel Energy Inc. 2015 Omnibus Incentive Plan Award Agreement Terms and Conditions under the Xcel Energy Inc. Amended and Restated 2015 Omnibus Incentive Plan
10.36+	Stock Program for Non-Employee Directors of Xcel Energy Inc. as Amended and Restated on Dec. 12, 2017 under the 2015 Omnibus Incentive Plan
NSP-Minnesota
4.11*	Supplemental and Restated Trust Indenture, dated May 1, 1988, from NSP-Minnesota to Harris Trust and Savings Bank, as Trustee, providing for the issuance of First Mortgage Bonds, Supplemental Indentures between NSP-Minnesota and said Trustee	Xcel Energy Inc. Form S-3 dated April 18, 2018	001-03034	4(b)(3)
4.12*	Supplemental Trust Indenture dated June 1, 1995, creating $250 million principal amount of 7.125% First Mortgage Bonds, Series due July 1, 2025	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2017	001-03034	4.11
4.13*	Supplemental Trust (Indenture dated March 1, 1998, creating $150 million principal amount of 6.5% First Mortgage Bonds, Series due March 1, 2028	Xcel Energy Inc. Form 10-K for the year ended Dec. 31, 2017	001-03034	4.12

80

4.14*	Supplemental Trust Indenture dated Aug. 1, 2000 (Assignment and Assumption of Trust Indenture)	NSP-Minnesota Form 10-12G dated Oct. 5, 2000	000-31709	4.51
4.15*	Indenture, dated July 1, 1999, between NSP-Minnesota and Norwest Bank Minnesota, NA, as Trustee, providing for the issuance of Sr. Debt Securities	Xcel Energy Inc. Form S-3 dated April 18, 2018	001-03034	4(b)(7)
4.16*	Supplemental Indenture, dated Aug. 18, 2000, supplemental to the Indenture dated July 1, 1999, among Xcel Energy, NSP-Minnesota and Wells Fargo Bank Minnesota, NA, as Trustee	NSP-Minnesota Form 10-12G dated Oct. 5, 2000	000-31709	4.63
4.17*	Supplemental Trust Indenture dated July 1, 2005 between NSP-Minnesota and BNY Midwest Trust Company, as successor Trustee, creating $250 million principal amount of 5.25% First Mortgage Bonds, Series due July 15, 2035	NSP-Minnesota Form 8-K dated July 14, 2005	001-31387	4.01
4.18*	Supplemental Trust Indenture dated May 1, 2006 between NSP-Minnesota and BNY Midwest Trust Company, as successor Trustee, creating $400 million principal amount of 6.25% First Mortgage Bonds, Series due June 1, 2036	NSP-Minnesota Form 8-K dated May 18, 2006	001-31387	4.01
4.19*	Supplemental Trust Indenture, dated June 1, 2007, between NSP-Minnesota and BNY Midwest Trust Company, as successor Trustee	NSP-Minnesota Form 8-K dated June 19, 2007	001-31387	4.01
4.20*	Supplemental Trust Indenture dated as of Nov. 1, 2009 between NSP-Minnesota and the Bank of New York Mellon Trust Co., NA, as successor Trustee, creating $300 million principal amount of 5.35% First Mortgage Bonds, Series due Nov. 1, 2039	NSP-Minnesota Form 8-K dated Nov. 16, 2009	001-31387	4.01
4.21*	Supplemental Trust Indenture dated as of Aug. 1, 2010 between NSP-Minnesota and the Bank of New York Mellon Trust Company, NA, as successor Trustee, creating $250 million principal amount of 1.95% First Mortgage Bonds, Series due Aug. 15, 2015 and $250 principal amount of 4.85% First Mortgage Bonds, Series due Aug. 15, 2040	NSP-Minnesota Form 8-K dated Aug. 4, 2010	001-31387	4.01
4.22*	Supplemental Trust Indenture dated as of Aug. 1, 2012 between NSP-Minnesota and the Bank of New York Mellon Trust Company, NA, as successor Trustee, creating $300 million principal amount of 2.15% First Mortgage Bonds, Series due Aug. 15, 2022 and $500 million principal amount of 3.40% First Mortgage Bonds, Series due Aug. 15, 2042	NSP-Minnesota Form 8-K dated Aug. 13, 2012	001-31387	4.01
4.23*	Supplemental Trust Indenture dated as of May 1, 2013 between NSP-Minnesota and the Bank of New York Mellon Trust Company, N.A., as successor Trustee, creating $400 million principal amount of 2.60% First Mortgage Bonds, Series due May 15, 2023	NSP-Minnesota Form 8-K dated May 20, 2013	001-31387	4.01
4.24*	Supplemental Trust Indenture dated as of May 1, 2014 between NSP-Minnesota and the Bank of New York Mellon Trust Company, N.A., as successor Trustee, creating $300 million principal amount of 4.125% First Mortgage Bonds, Series due May 15, 2044	NSP-Minnesota Form 8-K dated May 13, 2014	001-31387	4.01
4.25*	Supplemental Trust Indenture dated as of Aug. 1, 2015 between NSP-Minnesota and the Bank of New York Mellon Company, N.A., as successor Trustee, creating $300 million principal amount of 2.20% First Mortgage Bonds, Series due Aug. 15, 2020 and $300 million principal amount of 4.00% First Mortgage Bonds, Series due Aug. 15, 2045	NSP-Minnesota Form 8-K dated Aug. 11, 2015	001-31387	4.01
4.26*	Supplemental Trust Indenture dated as of May 1, 2016 between NSP-Minnesota and the Bank of NY Mellon Trust Company, N.A., as successor Trustee, creating $350 million principal amount of 3.60% First Mortgage Bonds, Series due May 31, 2046	NSP-Minnesota Form 8-K dated May 31, 2016	001-31387	4.01
4.27*	Supplemental Trust Indenture dated as of Sept. 1, 2017 between NSP-Minnesota and The Bank of New York Mellon Trust Company, N.A., as successor Trustee, creating $600 million principal amount of 3.60% First Mortgage Bonds, Series due Sept. 15, 2047	NSP-Minnesota Form 8-K dated Sept. 13, 2017	001-31387	4.01
10.37*	Restated Interchange Agreement dated Jan. 16, 2001 between NSP-Wisconsin and NSP-Minnesota	NSP-Wisconsin Form S-4 dated Jan. 21, 2004	333-112033	10.01
10.38*	Second Amendment and Restated Credit Agreement, dated as of June 20, 2016 among NSP-Minnesota, as Borrower, the several lenders from time to time parties thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, Bank of America, N.A. and Barclays Bank Plc, as Syndication Agents, and Wells Fargo Bank, National Association and the Bank of Tokyo-Mitsubishi UFJ, Ltd., as Documentation Agents	Xcel Energy Inc. Form 8-K dated June 20, 2016	001-03034	99.02
NSP-Wisconsin
4.28*	Supplemental and Restated Trust Indenture, dated March 1, 1991, between NSP-Wisconsin and First Wisconsin Trust Company, providing for the issuance of First Mortgage Bonds	Xcel Energy Inc. Form S-3 dated April 18, 2018	001-03034	4(c)(3)
4.29*	Trust Indenture dated Sept. 1, 2000 between NSP-Wisconsin and Firstar Bank, NA as Trustee	NSP-Wisconsin Form 8-K dated Sept. 25, 2000	001-03140	4.01
4.30*	Supplemental Trust Indenture dated as of Sept. 1, 2003 between NSP-Wisconsin and U.S. Bank National Association, supplementing indentures dated April 1, 1947 and March 1, 1991	Xcel Energy Inc Form 10-Q for the quarter ended Sept. 30, 2003	001-03034	4.05
4.31*	Supplemental Trust Indenture dated as of Sept. 1, 2008 between NSP-Wisconsin and U.S. Bank National Association, as successor Trustee, creating $200 million principal amount of 6.375% First Mortgage Bonds, Series due Sept. 1, 2038	NSP-Wisconsin Form 8-K dated Sept. 3, 2008	001-03140	4.01
4.32*	Supplemental Trust Indenture dated as of Oct. 1, 2012 between NSP-Wisconsin and U.S. Bank National Association, as successor Trustee, creating $100 million principal amount of 3.70% First Mortgage Bonds, Series due Oct. 1, 2042	NSP-Wisconsin Form 8-K dated Oct. 10, 2012	001-03140	4.01
4.33*	Supplemental Trust Indenture dated as of June 1, 2014 between NSP-Wisconsin and U.S. Bank National Association, as successor Trustee, creating $100 million principal amount of 3.30% First Mortgage Bonds, Series due June 1, 2024	NSP-Wisconsin Form 8-K dated June 23, 2014	001-03140	4.01
4.34*	Supplemental Trust Indenture dated as of Nov 1, 2017 between NSP-Wisconsin and U.S. Bank National Association, as successor Trustee, creating $100 million in aggregate principal amount of 3.75% First Mortgage Bonds, Series due Dec. 1, 2047	NSP-Wisconsin Form 8-K dated Dec. 4, 2017	001-03140	4.01
4.35*	Supplemental Indenture dated as of Sept. 1, 2018 between Northern States Power Company and U.S. Bank National Association, as successor Trustee, creating 4.20% First Mortgage Bonds, Series due Sept. 1, 2048	NSP-Wisconsin to Form 8-K dated Sept. 12, 2018	001-03034	4.01
10.39*	Restated Interchange Agreement dated Jan. 16, 2001 between NSP-Wisconsin and NSP-Minnesota	NSP-Wisconsin Form S-4 dated Jan. 21, 2004	333-112033	10.01

81

10.40*	Second Amended and Restated Credit Agreement, dated as of June 20, 2016 among NSP-Wisconsin, as Borrower, the several lenders from time to time parties thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, Bank of America, N.A. and Barclays Bank Plc, as Syndication Agents, and Wells Fargo Bank, National Association and the Bank of Tokyo-Mitsubishi UFJ, Ltd., as Documentation Agents	Xcel Energy Inc. Form 8-K dated June 20, 2016		99.05
PSCo
4.36*	Indenture, dated as of Oct. 1, 1993 between PSCo and Morgan Guaranty Trust Company of New York, as Trustee, providing for the issuance of First Collateral Trust Bonds	Xcel Energy Inc. Form S-3 dated April 18, 2018	001-03034	4(d)(3)
4.37*	Indenture dated July 1, 1999, between PSCo and The Bank of New York, providing for the issuance of Senior Debt Securities and First Supplemental Indenture dated July 14, 1999 between PSCo and the Bank of New York	PSCo Form 8-K dated July 13, 1999	001-03280	4.1 4.2
4.38*	Supplemental Indenture, dated Aug. 1, 2007 between PSCo and U.S. Bank Trust National Association, as successor Trustee	PSCo Form 8-K dated Aug. 8, 2007	001-03280	4.01
4.39*	Supplemental Indenture dated as of Aug. 1, 2008 between PSCo and U.S. Bank Trust National Association, as successor Trustee, creating $300 million principal amount of 5.80% First Mortgage Bonds, Series No. 18 due 2018 and $300 million principal amount of 6.50% First Mortgage Bonds, Series No. 19 due 2038	PSCo Form 8-K dated Aug. 6, 2008	001-03280	4.01
4.40*	Supplemental Indenture dated as of May 1, 2009 between PSCo and U.S. Bank Trust National Association, as successor Trustee, creating $400 million principal amount of 5.125% First Mortgage Bonds, Series No. 20 due 2019	PSCo Form 8-K dated May 28, 2009	001-03280	4.01
4.41*	Supplemental Indenture dated as of Nov. 1, 2010 between PSCo and U.S. Bank National Association, as successor Trustee, creating $400 million principal amount of 3.20% First Mortgage Bonds, Series No. 21 due 2020	PSCo Form 8-K dated Nov. 8, 2010	001-03280	4.01
4.42*	Supplemental Indenture dated as of Aug. 1, 2011 between PSCo and U.S. Bank National Association, as successor Trustee, creating $250 million principal amount of 4.75% First Mortgage Bonds, Series No. 22 due 2041	PSCo Form 8-K dated Aug. 9, 2011	001-03280	4.01
4.43*	Supplemental Indenture dated as of Sept. 1, 2012 between PSCo and U.S. Bank National Association, as successor Trustee, creating $300 million principal amount of 2.25% First Mortgage Bonds, Series No. 23 due 2022 and $500 million principal amount of 3.60% First Mortgage Bonds, Series No. 24 due 2042	PSCo Form 8-K dated Sept. 11, 2012	001-03280	4.01
4.44*	Supplemental Indenture dated as of March 1, 2013 between PSCo and U.S. Bank National Association, as successor Trustee, creating $250 million principal amount of 2.50% First Mortgage Bonds, Series No. 25 due 2023 and $250 million principal amount of 3.95% First Mortgage Bonds, Series No. 26 due 2043	PSCo Form 8-K dated March 26, 2013	001-03280	4.01
4.45*	Supplemental Indenture dated as of March 1, 2014 between PSCo and U.S. Bank National Association, as successor Trustee, creating $300 million principal amount of 4.30% First Mortgage Bonds, Series No. 27 due 2044	PSCo Form 8-K dated March 10, 2014	001-03280	4.01
4.46*	Supplemental Indenture dated as of May 1, 2015 between PSCo and U.S. Bank National Association, as successor Trustee, creating $250 million principal amount of 2.90% First Mortgage Bonds, Series No. 28 due 2025	PSCo Form 8-K dated May 12, 2015	001-03280	4.01
4.47*	Supplemental Indenture dated as of June 1, 2016 between PSCo and U.S. Bank National Association, as successor Trustee, creating $250 million principal amount of 3.55% First Mortgage Bonds, Series No. 29 due 2046	PSCo Form 8-K dated June 13, 2016	001-03280	4.01
4.48*	Supplemental Indenture No. 27 dated as of June 1, 2017 between PSCo and U.S. Bank National Association, as successor Trustee, creating $400 million principal amount of 3.80% First Mortgage Bonds, Series No. 30 due 2047	PSCo Form 8-K dated June 19, 2017	001-03280	4.01
4.49*	Supplemental Indenture dated as of June 1, 2018 between PSCo and U.S. Bank National Association, as successor Trustee, creating $350 million principal amount of 3.70% First Mortgage Bonds, Series No. 31 due 2028, and $350 million principal amount of 4.10% First Mortgage Bonds, Series No. 32 due 2048	PSCo Form 8-K dated June 21, 2018	001-03280	4.01
10.41*	Proposed Settlement Agreement, excerpts, as filed with the CPUC	Xcel Energy Inc. Form 8-K dated Dec. 3, 2004	001-03034	99.02
10.42*	Second Amended and Restated Credit Agreement, dated as of June 20, 2016 among PSCo, as Borrower, the several lenders from time to time parties thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, Bank of America, N.A. and Barclays Bank Plc, as Syndication Agents, and Wells Fargo Bank, National Association and the Bank of Tokyo-Mitsubishi UFJ, Ltd., as Documentation Agents	Xcel Energy Inc. Form 8-K dated June 20, 2016	001-03034	99.03
SPS
4.50*	Indenture dated Feb. 1, 1999 between SPS and the Chase Manhattan Bank	SPS Form 8-K dated Feb. 25, 1999	001-03789	99.2
4.51*	Third Supplemental Indenture dated Oct. 1, 2003 to the indenture dated Feb. 1, 1999 between SPS and JPMorgan Chase Bank, as successor Trustee, creating $100 million principal amount of Series C and Series D Notes, 6% due 2033	Xcel Energy Inc. Form 10-Q for the quarter ended Sept. 30, 2003	001-03034	4.04
4.52*	Fourth Supplemental Indenture dated Oct. 1, 2006 between SPS and the Bank of New York, as successor Trustee	SPS Form 8-K dated Oct. 3, 2006	001-03789	4.01
4.53*	Indenture dated as of Aug. 1, 2011 between SPS and U.S. Bank National Association, as Trustee	SPS Form 8-K dated Aug. 10, 2011	001-03789	4.01
4.54*	Supplemental Indenture dated as of Aug. 3, 2011 between SPS and U.S. Bank National Association, as Trustee, creating $200 million principal amount of 4.50% First Mortgage Bonds, Series No. 1 due 2041	SPS Form 8-K dated Aug. 10, 2011	001-03789	4.02
4.55*	Sixth Supplemental Indenture dated as of June 1, 2014 between SPS and the Bank of New York Mellon Trust Company, N.A., as successor Trustee	SPS Form 8-K dated June 2, 2014	001-03789	4.03
4.56*	Supplemental Indenture No. 3 dated as of June 1, 2014 between SPS and U.S. Bank National Association, as Trustee, creating $150 million principal amount of 3.30% First Mortgage Bonds, Series No. 3 due 2024	SPS Form 8-K dated June 9, 2014	001-03789	4.02
4.57*	Supplemental Indenture dated as of Aug. 1, 2016 between SPS and U.S. Bank National Association, as Trustee, creating $300 million principal amount of 3.40% First Mortgage Bonds, Series No. 4 due 2046	SPS Form 8-K dated Aug. 12, 2016	001-03789	4.02

82

4.58*	Supplemental Indenture dated as of Aug. 1, 2017 between SPS and U.S. Bank National Association, as Trustee, creating $450 million principal amount of 3.70% First Mortgage Bonds, Series No. 5 due 2047	SPS Form 8-K dated Aug 9. 2017	001-03789	4.02
4.59*	Supplemental Indenture No. 6 dated as of Oct. 1, 2018 between SPS and U.S. Bank National Association, as Trustee, creating 4.40% First Mortgage Bonds, Series No. 6 due 2048	SPS Form 8-K dated Nov. 5, 2018	001-03789	4.02
10.43*	Second Amended and Restated Credit Agreement, dated as of June 20, 2016 among SPS, as Borrower, the several lenders from time to time parties thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, Bank of America, N.A. and Barclays Bank Plc, as Syndication Agents, and Wells Fargo Bank, National Association, and The Bank of Tokyo-Mitsubishi UFJ, Ltd., as Documentation Agents	Xcel Energy Inc. Form 8-K dated June 20, 2016	001-03034	99.04
Xcel Energy Inc.
21.01	Subsidiaries of Xcel Energy Inc.
23.01	Consent of Independent Registered Public Accounting Firm
24.01	Powers of Attorney
31.01	Principal Executive Officer’s certification pursuant to 18 U.S. C. Section 1350, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.02	Principal Financial Officer’s certification pursuant to 18 U.S. C. Section 1350, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.01	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	The following materials from Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2018 are formatted in XBRL (eXtensible Business Reporting Language): (i) the Consolidated Statements of Income, (ii) the Consolidated Statements of Comprehensive Income, (iii) the Consolidated Statements of Cash Flows, (iv) the Consolidated Balance Sheets, (v) the Consolidated Statements of Common Stockholders’ Equity, (vi) Notes to Consolidated Financial Statements, (vii) document and entity information, (viii) Schedule I, and (ix) Schedule II.

83

SCHEDULE I

XCEL ENERGY INC. CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (amounts in millions, except per share data)
	Year Ended Dec. 31
	2018			2017			2016
Income
Equity earnings of subsidiaries	$	1,393		$	1,263		$	1,199
Total income	1,393			1,263			1,199
Expenses and other deductions
Operating expenses	24			30			22
Other income	(1		)	(6		)	(3		)
Interest charges and financing costs	149			128			116
Total expenses and other deductions	172			152			135
Income before income taxes	1,221			1,111			1,064
Income tax benefit	(40		)	(37		)	(59		)
Net income	$	1,261		$	1,148		$	1,123
Other Comprehensive Income
Pension and retiree medical benefits, net of tax of $1, $3 and $(3) respectively	$	3		$	4		$	(4	)
Derivative instruments, net of tax of $(1), $2 and $2, respectively	(2		)	3			4
Other comprehensive income (loss)	1			7			—
Comprehensive income	$	1,262		$	1,155		$	1,123
Weighted average common shares outstanding:
Basic	511			509			509
Diluted	511			509			509
Earnings per average common share:
Basic	$	2.47		$	2.26		$	2.21
Diluted	2.47			2.25			2.21
See Notes to Condensed Financial Statements

XCEL ENERGY INC. CONDENSED STATEMENTS OF CASH FLOWS (amounts in millions)
	Year Ended Dec. 31
	2018			2017			2016
Operating activities
Net cash provided by operating activities	$	1,210		$	1,208		$	817
Investing activities
Capital contributions to subsidiaries	(809		)	(849		)	(414		)
Investments in the utility money pool	(2,578		)	(1,258		)	(1,880		)
Return of investments in the utility money pool	2,493			1,173			1,880
Net cash used in investing activities	(894		)	(934		)	(414		)
Financing activities
Proceeds from (repayment of) short-term borrowings, net	(295		)	715			(516		)
Proceeds from issuance of long-term debt	492			—			1,539
Repayment of long-term debt	—			(250		)	(704		)
Proceeds from issuance of common stock	230			—			—
Repurchase of common stock	(1		)	(3		)	(32		)
Dividends paid	(730		)	(721		)	(681		)
Other	(12		)	(14		)	(9		)
Net cash (used in) provided by financing activities	(316		)	(273		)	(403		)
Net change in cash and cash equivalents	—			1			—
Cash and cash equivalents at beginning of period	1			—			—
Cash and cash equivalents at end of period	$	1		$	1		$	—
See Notes to Condensed Financial Statements

XCEL ENERGY INC. CONDENSED BALANCE SHEETS (amounts in millions)
	Dec. 31
	2018		2017
Assets
Cash and cash equivalents	$	1	$	1
Accounts receivable from subsidiaries	309		302
Other current assets	1		1
Total current assets	311		304
Investment in subsidiaries	15,965		14,932
Other assets	44		103
Total other assets	16,009		15,035
Total assets	$	16,320	$	15,339
Liabilities and Equity
Current portion of long-term debt	$	—	$	—
Dividends payable	195		183
Short-term debt	488		783
Other current liabilities	10		11
Total current liabilities	693		977
Other liabilities	32		29
Total other liabilities	32		29
Commitments and contingencies
Capitalization
Long-term debt	3,373		2,878
Common stockholders’ equity	12,222		11,455
Total capitalization	15,595		14,333
Total liabilities and equity	$	16,320	$	15,339
See Notes to Condensed Financial Statements

NOTES TO CONDENSED FINANCIAL STATEMENTS

Incorporated by reference are Xcel Energy’s consolidated statements of common stockholders’ equity and other comprehensive income in Part II, Item 8.

Basis of Presentation — The condensed financial information of Xcel Energy Inc. is presented to comply with Rule 12-04 of Regulation S-X. Xcel Energy Inc.’s investments in subsidiaries are presented under the equity method of accounting. Under this method, the assets and liabilities of subsidiaries are not consolidated. The investments in net assets of the subsidiaries are recorded in the balance sheets. The income from operations of the subsidiaries is reported on a net basis as equity in income of subsidiaries.

As a holding company with no business operations, Xcel Energy Inc.’s assets consist primarily of investments in its utility subsidiaries. Xcel Energy Inc.’s material cash inflows are only from dividends and other payments received from its utility subsidiaries and the proceeds raised from the sale of debt and equity securities. The ability of its utility subsidiaries to make dividend and other payments is subject to the availability of funds after taking into account their respective funding requirements, the terms of their respective indebtedness, the regulations of the FERC under the Federal Power Act, and applicable state laws. Management does not expect maintaining these requirements to have an impact on Xcel Energy Inc.’s ability to pay dividends at the current level in the foreseeable future. Each of its utility subsidiaries, however, is legally distinct and has no obligation, contingent or otherwise, to make funds available to Xcel Energy Inc.

84

Guarantees and Indemnifications

Xcel Energy Inc. provides guarantees and bond indemnities under specified agreements or transactions, which guarantee payment or performance. Xcel Energy Inc.’s exposure is based upon the net liability of the relevant subsidiary under the specified agreements or transactions. Most of the guarantees and bond indemnities issued by Xcel Energy Inc. limit the exposure to a maximum stated amount. As of Dec. 31, 2018 and 2017, Xcel Energy Inc. had no assets held as collateral related to guarantees, bond indemnities and indemnification agreements.

Guarantees and bond indemnities issued and outstanding as of Dec. 31, 2018:

(Millions of Dollars)	Guarantor	Guarantee Amount		Current Exposure		Triggering Event
Guarantee of the indemnification obligations of Xcel Energy Services Inc. under the aircraft leases (a)	Xcel Energy Inc.	$	11.0	$	—	(d)
Guarantee of loan for Hiawatha Collegiate High School (b)	Xcel Energy Inc.	1.0		—		(d)
Total guarantees issued		12.0		$	—
Guarantee performance and payment of surety bonds for Xcel Energy Inc.’s utility subsidiaries (c)	Xcel Energy Inc.	$	51.1	(f)		(e)

^(a)  The terms of this guarantee expires in 2021 and 2023 when the associated leases expire.

^(b)  The term of this guarantee expires the earlier of 2024 or full repayment of the loan.

^(c)  The surety bonds primarily relate to workers compensation benefits and utility projects. The workers compensation bonds are renewed annually and the project based bonds expire in conjunction with the completion of the related projects.

^(d)  Nonperformance and/or nonpayment.

^(e)  Per the indemnity agreement between Xcel Energy Inc. and the various surety companies, surety companies have the discretion to demand that collateral be posted.

^(f)  Due to the magnitude of projects associated with the surety bonds, the total current exposure of this indemnification cannot be determined. Xcel Energy Inc. believes the exposure to be significantly less than the total amount of the outstanding bonds.

Indemnification Agreements

Xcel Energy Inc. provides indemnifications through contracts entered into in the normal course of business. Indemnifications are primarily against adverse litigation outcomes in connection with underwriting agreements, breaches of representations and warranties, including corporate existence, transaction authorization and certain income tax matters. Obligations under these agreements may be limited in terms of duration or amount. Maximum future payments under these indemnifications cannot be reasonably estimated as the dollar amounts are often not explicitly stated.

Related Party Transactions — Xcel Energy Inc. presents related party receivables net of payables. Accounts receivable and payable with affiliates at Dec. 31:

	2018				2017
(Millions of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	117	$	—	$	68	$	—
NSP-Wisconsin	3		—		13		—
PSCo	29		—		69		—
SPS	39		—		26		—
Xcel Energy Services Inc.	96		—		95		—
Xcel Energy Ventures Inc.	13		—		14		—
Other subsidiaries of Xcel Energy Inc.	12		—		17		—
	$	309	$	—	$	302	$	—

Dividends — Cash dividends paid to Xcel Energy Inc. by its subsidiaries were $1,097 million, $1,063 million and $923 million for the years ended Dec. 31, 2018, 2017 and 2016, respectively. These cash receipts are included in operating cash flows of the condensed statements of cash flows.

Money Pool— FERC approval was received to establish a utility money pool arrangement with the utility subsidiaries, subject to receipt of required state regulatory approvals. The utility money pool allows for short-term investments in and borrowings between the utility subsidiaries. Xcel Energy Inc. may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy Inc.

Money pool lending for Xcel Energy Inc.:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Dec. 31, 2018
Loan outstanding at period end	$	—
Average loan outstanding	59
Maximum loan outstanding	172
Weighted average interest rate, computed on a daily basis	2.22		%
Weighted average interest rate at end of period	N/A
Money pool interest income	$	0.3

(Amounts in Millions, Except Interest Rates)	Year Ended Dec. 31, 2018			Year Ended Dec. 31, 2017			Year Ended Dec. 31, 2016
Loan outstanding at period end	$	—		$	85		$	—
Average loan outstanding	71			38			66
Maximum loan outstanding	243			226			211
Weighted average interest rate, computed on a daily basis	1.95		%	1.13		%	0.69		%
Weighted average interest rate at end of period	N/A			1.18			N/A
Money pool interest income	$	1.4		$	0.4		$	0.5

See notes to the consolidated financial statements in Part II, Item 8.

SCHEDULE II

XCEL ENERGY INC. AND SUBSIDIARIES VALUATION AND QUALIFYING ACCOUNTS YEARS ENDED DEC. 31

	Allowance for bad debts									NOL and tax credit valuation allowances
(Millions of Dollars)	2018			2017			2016			2018				2017				2016
Balance at Jan. 1	$	52		$	51		$	52		$	77			$	58			$	28
Additions Charged to Costs and Expenses	42			39			39			7				9				3
Additions Charged to Other Accounts	11			10			11			—			(a)	22			(a)	35			(a)
Deductions from Reserves	(50		)	(48		)	(51		)	(5		)	(b)	(12		)	(b)	(8		)	(b)
Balance at Dec. 31	$	55		$	52		$	51		$	79			$	77			$	58

^(a)  The 2016 - 2017 changes are the accrual of valuation allowances for North Dakota ITC, net of federal income tax benefit, that is offset to a regulatory liability; the 2017 change includes $14 million expense related to the revaluation of federal benefit as a result of the TCJA.

^(b)  Primarily the reductions to valuation allowances for North Dakota ITC carryforwards, net of federal benefit, primarily due to a consolidated adjustment to the regulatory liability accrual referenced above; the 2017 change includes $4 million of reduced expense related to the revaluation of federal benefit as a result of TCJA.

Item 16 — Form 10-K Summary

None.

85

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this annual report to be signed on its behalf by the undersigned thereunto duly authorized.

		XCEL ENERGY INC.
Feb. 22, 2019	By:	/s/ ROBERT C. FRENZEL
		Robert C. Frenzel
		Executive Vice President, Chief Financial Officer
		(Principal Financial Officer)

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities on the date indicated above.

	/s/ BEN FOWKE	Chairman, President, Chief Executive Officer and Director
	Ben Fowke	(Principal Executive Officer)
	/s/ ROBERT C. FRENZEL	Executive Vice President, Chief Financial Officer
	Robert C. Frenzel	(Principal Financial Officer)
	/s/ JEFFREY S. SAVAGE	Senior Vice President, Controller
	Jeffrey S. Savage	(Principal Accounting Officer)
*		Director
	Lynn Casey
*		Director
	Richard K. Davis
*		Director
	Richard T. O’Brien
*		Director
	David K. Owens
*		Director
	Christopher J. Policinski
*		Director
	James Prokopanko
*		Director
	A. Patricia Sampson
*		Director
	James J. Sheppard
*		Director
	David A. Westerlund
*		Director
	Kim Williams
*		Director
	Timothy V. Wolf
*		Director
	Daniel Yohannes
*By:	/s/ ROBERT C. FRENZEL	Attorney-in-Fact
	Robert C. Frenzel

86

EX-10.34

Exhibit 10.34

XCEL ENERGY INC.

Amended and Restated 2015 Omnibus Incentive Plan

Contents

Article 1. Establishment, Purpose and Duration	1
Article 2. Definitions	1
Article 3. Administration	7
Article 4. Shares Subject to The Plan, Maximum Awards and Minimum Vesting Standards	9
Article 5. Eligibility and Participation	12
Article 6. Stock Options	12
Article 7. Stock Appreciation Rights	14
Article 8. Restricted Stock	15
Article 9. Restricted Stock Units	16
Article 10. Performance Share Units	16
Article 11. Performance Units	17
Article 12. Other Stock-Based Awards and Cash-Based Awards	17
Article 13. Effect of Termination of Service	18
Article 14. Transferability of Awards and Shares	19
Article 15. Performance-Based Compensation and Compliance with Code Section 162(m)	19
Article 16. Nonemployee Director Awards	22
Article 17. Effect of a Change in Control	23
Article 18. Dividends and Dividend Equivalents	24
Article 19. Beneficiary Designation	25
Article 20. Rights of Participants	25
Article 21. Amendment and Termination	25
Article 22. General Provisions	27

Xcel Energy Inc.Amended and Restated 2015 Omnibus Incentive Plan

Article 1. Establishment, Purpose and Duration

1.1    Establishment. Xcel Energy Inc., a Minnesota corporation, previously established the Xcel Energy Inc. 2015Omnibus Incentive Plan effective May 20, 2015 (the “Effective Date”). The Plan permits the grant of various forms of equity- and cash-based awards. The amendment and restatement of the Plan is effective as of January 1, 2018.

1.2    Purpose of the Plan. The purpose of the Plan is to foster and promote the long-term financial success of the Company by (a) motivating superior performance by means of performance-related incentives, (b) encouraging and providing for the acquisition of an ownership interest in the Company by Participants, and (c) enabling the Company to attract and retain qualified and competent persons as employees of the Company and to serve as members of the Board and whose judgment, interest and performance are required for the successful operations of the Company.

1.3    Duration of the Plan. Unless sooner terminated as provided herein, the Plan shall terminate ten (10) years from the Effective Date. After the Plan is terminated, no Awards may be granted but Awards previously granted shall remain outstanding in accordance with their applicable terms and conditions and the Plan’s terms and conditions.

Article 2. Definitions

Whenever used in the Plan, the following terms shall have the meanings set forth below, and when the meaning is intended, the initial letter of the word shall be capitalized.

2.1“Affiliate” means any entity that is a Subsidiary or parent corporation of the Company, or any other entity in which the Company owns, directly or indirectly, at least 20% of combined voting power of the entity’s Voting Securities and which is designated by the Committee as covered by the Plan.

2.2“Award” means a grant under the Plan of Nonqualified Stock Options, Incentive Stock Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units, Performance Share Units, Performance Units, Cash-Based Awards or Other Stock-Based Awards, in each case subject to the terms of the Plan.

2.3“Award Agreement” means a written or electronic agreement entered into by the Company and a Participant, or a written or electronic statement issued by the Company to a Participant, which in either case contains (either expressly or by reference to this Plan or any subplan created hereunder) the terms and provisions applicable to an Award granted under the Plan, including any amendment or modification thereof. The Committee may provide for the use of electronic, Internet or other non-paper Award Agreements, and the use of electronic, Internet or other non-paper means for the acceptance thereof and actions thereunder by a Participant.

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2.4“Beneficial Owner” shall have the meaning ascribed to such term in Rule 13d-3 of the General Rules and Regulations under the Exchange Act and the terms “Beneficial Ownership” and “Beneficially Own” shall have the corresponding meanings.

2.5“Board” means the Board of Directors of the Company.

2.6“Cash-Based Award” means an Award, denominated in cash, granted to a Participant as described in Article 12.

2.7“Cause” means what the term is expressly defined to mean in a then-effective written agreement (including an Award Agreement) between a Participant and the Company or any Affiliate or in any Company severance policy to which a Participant is subject, or in the absence of any such agreement, policy or definition means, in the judgment of the Committee:

(a)    willful and material misconduct of the Participant,

(b)    willful and continued failure of the Participant to perform essential job functions,

(c)    the conviction of the Participant by a court of competent jurisdiction of a felony or entering the plea of nolo contendere to a felony by the Participant, or

(d)    the commission by the Participant of an act of theft, fraud, dishonesty or insubordination that is materially detrimental to the Company or any Subsidiary.

2.8A “Change in Control” means, except as may otherwise be provided in an Award Agreement, the occurrence of any one of the following events:

With respect to Awards granted on or after January 1, 2018 (other than Awards that constitute a deferral of compensation under Section 409A of the Code granted between January 1, 2018 and January 1, 2019):

(a)A direct or indirect acquisition by an individual, entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act) (a “Person”) of Beneficial Ownership of Shares which, together with other direct or indirect acquisitions or beneficial ownership by such Person, results in aggregate Beneficial Ownership by such Person of twenty percent (20%) or more of either (1) the then outstanding Shares of common stock (the “Outstanding Company Common Stock”), or (2) the combined voting power of the then outstanding Voting Securities of the Company (the “Outstanding Company Voting Securities”); excluding, however, the following: (i) any acquisition directly from the Company, other than an acquisition by virtue of the exercise of a conversion privilege unless the security being so converted was itself acquired directly from the Company, (ii) any acquisition by the Company or a wholly owned Subsidiary, (iii) any acquisition by any employee benefit plan (or related trust) sponsored or maintained by the Company or any entity controlled by the Company, or (iv) any acquisition by any entity pursuant to a transaction which complies with clauses (i), (ii) and (iii) of subsection (c) of this definition; or

(b)A change in the composition of the Board such that the individuals who, as of the Effective Date, constitute the Board (the “Incumbent Board”) cease for any reason to constitute a majority of the Board; provided, however, that any individual who becomes a member of the

2    

Board subsequent to the Effective Date, whose election, or nomination for election by the Company’s shareholders, was approved by a vote of a majority of those individuals then comprising the Incumbent Board shall be considered as though such individual were a member of the Incumbent Board; but, provided further, that any such individual whose initial assumption of office occurs as a result of either an actual or threatened election contest with respect to the election or removal of directors or other actual or threatened solicitation of proxies or consents by or on behalf of a Person other than the Board shall not be so considered as a member of the Incumbent Board; or

(c)The consummation of a Corporate Transaction; excluding, however, such a Corporate Transaction pursuant to which (i) all or substantially all of the individuals and entities who are the Beneficial Owners, respectively, of the Outstanding Company Common Stock and Outstanding Company Voting Securities immediately prior to such Corporate Transaction will Beneficially Own, directly or indirectly, more than sixty percent (60%) of, respectively, the outstanding shares of common stock, and the combined voting power of the then outstanding Voting Securities of the surviving or acquiring entity resulting from such Corporate Transaction or a direct or indirect parent entity of the surviving or acquiring entity (including, without limitation, an entity which as a result of such transaction owns the Company or all or substantially all of the Company’s assets either directly or through one or more subsidiaries) in substantially the same proportions (as compared to each other) as their ownership, immediately prior to such Corporate Transaction, of the Outstanding Company Common Stock and Outstanding Company Voting Securities, as the case may be, (ii) no Person (other than the Company, any wholly owned Subsidiary, any employee benefit plan (or related trust)) sponsored or maintained by the Company, any entity controlled by the Company, such surviving or acquiring entity resulting from such Corporate Transaction or any entity controlled by such surviving or acquiring entity or a direct or indirect parent entity of the surviving or acquiring entity that, after giving effect to the Corporate Transaction, beneficially owns, directly or indirectly, 100% of the outstanding Voting Securities of the surviving or acquiring entity) will Beneficially Own, directly or indirectly, twenty percent (20%) or more of, respectively, the outstanding shares of common stock (or comparable equity interests) of the entity resulting from such Corporate Transaction or the combined voting power of the outstanding Voting Securities of such entity except to the extent that such ownership existed prior to the Corporate Transaction and (iii) individuals who were members of the Incumbent Board will constitute a majority of the members of the board of directors (or similar governing body) of the surviving or acquiring entity resulting from such Corporate Transaction or a direct or indirect parent entity of the surviving or acquiring entity.

Notwithstanding the foregoing, for purposes of any Award subject to Section 409A of the Code, if that Award provides for a change in the time or form of payment upon a Change in Control, then no Change in Control shall be deemed to have occurred upon an event described in this Section 2.8 unless the event would also constitute a change in ownership of the Company, a change in effective control of the Company, or a change in ownership of a substantial portion of the Company’s assets under Section 409A of the Code.

With respect to Awards with an effective date of grant prior to January 1, 2018 and Awards granted between January 1, 2018 and January 1, 2019 that constitute a deferral of compensation under Section 409A of the Code, the definition of Change in Control shall be as set forth in the Original Plan.

3    

2.9“Code” means the U.S. Internal Revenue Code of 1986, as amended from time to time. For purposes of the Plan, references to sections of the Code shall be deemed to include references to any applicable regulations thereunder and any successor or similar provision.

2.10“Commission” means the Securities and Exchange Commission.

2.11“Committee” means, for purposes of Awards granted to Employees, the Governance, Compensation and Nominating Committee of the Board or a subcommittee thereof or any other committee designated by the Board to administer the Plan. The members of the Committee shall be appointed from time to time by and shall serve at the discretion of the Board. If the Committee does not exist or cannot function for any reason, the Board may take any action under the Plan that would otherwise be the responsibility of the Committee. Each member of the Committee shall be (i) an independent director within the meaning of the rules and regulations of the New York Stock Exchange (or such other national securities exchange which is the principal market on which the Shares are then traded), (ii) a non-employee director within the meaning of Exchange Act Rule 16b-3, and (iii) an outside director for purposes of Code Section 162(m). Notwithstanding the foregoing, for Awards that may be granted to Directors, all references to the Committee in this Plan shall mean the Board of Directors.

2.12“Company” means Xcel Energy Inc., and any successor thereto as provided in Section 22.21.

2.13“Corporate Transaction” means (i) a dissolution or liquidation of the Company, (ii) a sale of all or substantially all of the assets of the Company, (iii) a merger or consolidation of the Company with or into any other corporation, regardless of whether the Company is the surviving corporation or (iv) a statutory share exchange involving capital stock of the Company.

2.14“Covered Employee” means a Participant designated by the Committee at or prior to the time an Award is granted to him or her hereunder who is or is likely to become a “covered employee” as defined in Code Section 162(m) and for whom such Award has been designated as Performance-Based Compensation in accordance with Article 15.

2.15“Director” means any individual who is a member of the Board.

2.16“Disability” means a mental or physical condition which, in the opinion of the Committee, renders a Participant unable or incompetent to carry out the job responsibilities which such Participant held or tasks to which such Participant was assigned at the time the disability was incurred and which is expected to be permanent or for an indefinite period. With respect to any Award that constitutes deferred compensation under Code Section 409A and is subject to Code Section 409A, the Committee may not find that a Disability exists with respect to the applicable Participant unless, in the Committee’s opinion, such Participant is also “disabled” within the meaning of Code Section 409A.

2.17“Dividend Equivalent” has the meaning set forth in Section 18.

2.18“Effective Date” has the meaning set forth in Section 1.1.

2.19“Employee” means any individual performing services for the Company or a Subsidiary and designated as an employee of the Company, an Affiliate or the Subsidiary on its

4    

payroll records. An Employee shall not include any individual during any period he or she is classified or treated by the Company, Affiliate or Subsidiary as an independent contractor, a consultant or an employee of an employment, consulting or temporary agency or any other entity other than the Company, Affiliate or Subsidiary, without regard to whether such individual is subsequently determined to have been, or is subsequently retroactively reclassified, as a common-law employee of the Company, Affiliate or Subsidiary during such period. An individual shall not cease to be an Employee in the case of (i) any leave of absence approved by the Company or (ii) transfers between locations of the Company or among the Company, or any Affiliate or any Subsidiary. For purposes of Incentive Stock Options, no such leave may exceed 90 days, unless reemployment upon expiration of such leave is guaranteed by statute or contract. If reemployment upon expiration of a leave of absence approved by the Company is not so guaranteed, then three months following the 91st day of such leave, any Incentive Stock Option held by a Participant shall cease to be treated as an Incentive Stock Option and shall be treated for tax purposes as a Nonqualified Stock Option. Neither service as a Director nor payment of a director’s fee by the Company shall be sufficient to constitute “employment” by the Company.

2.20“Exchange Act” means the Securities Exchange Act of 1934.

2.21“Exercise Price” means the price at which a Share may be purchased by a Participant pursuant to an Option.

2.22“Fair Market Value” means, as applied to a specific date and unless otherwise specified in an Award Agreement, the price of a Share that is equal to the closing price of a Share on the New York Stock Exchange (or, on such other national securities exchange that is the primary trading market for the Shares, if Shares are not then listed on the NYSE) on the day preceding the date of determination, or if no sales of Shares shall have occurred on such exchange on the day preceding the applicable date of determination, the closing price of the Shares on such exchange on the next preceding date on which there were such sales. Notwithstanding the foregoing, if Shares are not traded on any established stock securities exchange, the Fair Market Value means the price of a Share as established by the Committee acting in good faith based on a reasonable valuation method that is consistent with the requirements of Section 409A of the Code and the regulations thereunder.

2.23“Grant Date” means the date an Award to a Participant pursuant to the Plan is approved by the Committee (or such later date as specified in such approval by the Committee) or, in the case of an Award granted to a Non-Employee Director, the date on which such Award is approved by the Board (or such later date as specified in such approval by the Board).

2.24“Grant Price” means the per Share price established at the time of grant of an SAR pursuant to Article 7.

2.25“Incentive Stock Option” or “ISO” means an Award granted pursuant to Article 6 that is designated as an Incentive Stock Option and that is intended to meet the requirements of Code Section 422 or any successor provision.

2.26“Nonemployee Director” means a Director who is not an Employee.

5    

2.27“Nonqualified Stock Option” means an Award granted pursuant to Article 6 that is not intended to meet the requirements of Code Section 422, or that otherwise does not meet such requirements.

2.28“Option” means an Award consisting of a right granted to a Participant pursuant to Article 6 to purchase a specified number of Shares at a specified price, which Award may be an Incentive Stock Option or a Nonqualified Stock Option.

2.29“Original Plan” means the Xcel Energy Inc. 2015 Omnibus Incentive Plan as in effect from May 20, 2015 to December 31, 2017.

2.30 “Other Stock-Based Award” means an equity-based or equity-related Award not otherwise described by the terms of the Plan that is granted pursuant to Article 12.

2.31“Participant” means any eligible individual as set forth in Article 5 to whom an Award is granted.

2.32“Performance-Based Compensation” means compensation under an Award that is intended to satisfy the requirements of Code Section 162(m) for certain performance-based compensation paid to Covered Employees. Notwithstanding the foregoing, nothing in the Plan shall be construed to mean that an Award that does not satisfy the requirements for performance-based compensation under Code Section 162(m) does not constitute performance-based compensation for other purposes, including Code Section 409A.

2.33“Performance Measures” means measures, as described in Section 15.2, upon which performance goals are based and that are approved by the Company’s shareholders pursuant to the Plan in order to qualify Awards as Performance-Based Compensation.

2.34“Performance Period” means the period of time during which pre-established performance goals must be met in order to determine the degree of payout and/or vesting with respect to an Award.

2.35“Performance Share Unit” means an Award granted pursuant to Article 10.

2.36“Performance Unit” means an Award granted pursuant to Article 11.

2.37“Period of Restriction” means the period when Restricted Stock or Restricted Stock Units are subject to a vesting requirement (based on the continued service, the achievement of performance goals or upon the occurrence of other events as determined by the Committee, in its discretion) as provided in Articles 8 and 9.

2.38“Plan” means the Xcel Energy Inc. 2015 Omnibus Incentive Plan, as the same may be amended from time to time.

2.39“Prior Plans” means the Xcel Energy Inc. 2005 Long-term Incentive Plan (as amended and restated effective February 17, 2010), the Stock Equivalent Plan for Non-Employee Directors of Xcel Energy Inc. (as amended and restated effective February 23, 2011) and Xcel Energy Inc. Executive Annual Incentive Award Plan (as amended and restated

6    

effective February 17, 2010).This Plan shall be considered a successor plan to any of the Prior Plans with respect to Awards made hereunder.

2.40“Restricted Stock” means Shares issued to a Participant that are subject to an Award granted pursuant to Article 8 and to such restrictions on transfer, forfeiture conditions and other restrictions or limitations as may be set forth in this Plan and the applicable Award Agreement.

2.41“Restricted Stock Unit” means the right under an Award granted pursuant to Article 9 to receive at a future time one Share, or the Fair Market Value thereof, subject to such restrictions on transfer, forfeiture conditions and other restrictions or limitations as may be set forth in this Plan and the applicable Award Agreement.

2.42“Share” means a share of common stock, par value $2.50 per share, of the Company.

2.43“Stock Appreciation Right” or “SAR” means the right under an Award granted pursuant to Article 7 to receive, in cash and/or Shares as determined by the Committee, an amount equal to the appreciation in value of a specified number of Shares between the Grant Date of the SAR and its exercise date.

2.44“Subsidiary” means any corporation or other entity, whether domestic or foreign, in which the Company has or obtains, directly or indirectly, ownership of more than 50% of the total combined voting power of all classes of stock.

2.45“Substitute Award” means an Award granted upon the assumption of, or in substitution or exchange for, outstanding awards granted by a company or other entity acquired by the Company or any Affiliate or with which the Company or any Affiliate combines.

2.45    “Termination of Service” means the following:

(a)    for an Employee, the date on which the Employee is no longer an Employee, or

(b)    for a Non-Employee Director, the date on which the Non-Employee Director is no longer a member of the Board.

With respect to any payment of an Award subject to Code Section 409A, a Termination of Service shall mean a “separation from service” within the meaning of Code Section 409A.

2.46    “Voting Securities” of an entity means the outstanding equity securities (or comparable interests) entitled to vote generally in the election of directors of such entity.

Article 3. Administration

3.1    General. The Committee shall be responsible for administering the Plan, subject to this Article 3 and the other provisions of the Plan. The Committee may employ attorneys, consultants, accountants, agents and other individuals, any of whom may be an Employee, and the Committee, the Company, and its officers and Directors shall be entitled to rely upon the advice, opinions or valuations of any such individuals. All actions taken and all interpretations

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and determinations made by the Committee shall be final and binding upon the Participants, the Company or Subsidiary, and all other interested individuals. Any action of the Committee shall be valid and effective even if the members of the Committee at the time of such action are later determined not to have satisfied all of the criteria for membership in clauses (i), (ii) and (iii) of Section 2.11.

3.2    Authority of the Committee. Subject to any express limitations set forth in the Plan, the Committee shall have full and exclusive discretionary power and authority to take such actions as it deems necessary and advisable with respect to the administration of the Plan including, but not limited to, the following:

(a)    To determine from time to time which of the persons eligible under the Plan shall be granted Awards, when and how each Award shall be granted, what type or combination of types of Awards shall be granted, the provisions of each Award granted (which need not be identical), including the time or times when a person shall be permitted to receive Shares pursuant to an Award and the number of Shares subject to an Award;

(b)    To construe and interpret the Plan and Awards granted under it, and to establish, amend, and revoke rules and regulations for its administration;

(c)    To correct any defect, omission or inconsistency in the Plan or in an Award Agreement, in a manner and to the extent it shall deem necessary or expedient to make the Plan fully effective;

(d)    To approve forms of Award Agreements for use under the Plan;

(e)    To determine Fair Market Value of a Share in accordance with Section 2.22 of the Plan;

(f)    To amend any Award Agreement as permitted under the Plan;

(g)    To adopt sub-plans and/or special provisions applicable to stock awards regulated by the laws of a jurisdiction other than and outside of the United States, to Cash-Based Awards, or to awards to Directors (as contemplated by Article 16). Such sub-plans and/or special provisions shall be subject to and consistent with the terms of the Plan, except to the extent the Committee determines that different terms and conditions are necessary or desirable to comply with the laws of a jurisdiction other than and outside of the United States;

(h)    To authorize any person to execute on behalf of the Company any instrument required to affect the grant of an Award;

(i)    To determine whether Awards will be settled in Shares of common stock, cash or in any combination thereof;

(j)    To determine whether Awards will provide for Dividend Equivalents;

(k)    To establish a program whereby Participants designated by the Committee may reduce compensation otherwise payable in cash in exchange for Awards under the Plan;

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(l)    To authorize a program permitting eligible Participants to surrender outstanding Awards in exchange for newly granted Awards subject to any applicable shareholder approval requirements set forth in Section 21.1 of the Plan;

(m)    To impose such restrictions, conditions or limitations as it determines appropriate as to the timing and manner of any resales by a Participant or other subsequent transfers by a Participant of any Shares, including, without limitation, restrictions under an insider trading policy and restrictions as to the use of a specified brokerage firm for such resales or other transfers;

(n)    To waive any restrictions, conditions or limitations imposed on an Award at the time the Award is granted or at any time thereto including but not limited to forfeiture, vesting and treatment of Awards upon a Termination of Service; and

(o) To permit Participants to elect to defer payments of Awards; provided that any such deferrals shall comply with applicable requirements of the Code, including Code Section 409A.

3.3    Delegation. To the extent permitted by law,the Committee may delegate all or any portion of its authority under the Plan to one or more of its members or, as to Awards to Participants who are not subject to Section 16 of the Exchange Act, to one or more officers or other Directors of the Company. Any such delegation by the Committee to a Director (including an officer who is also a Director) may be combined and coordinated with a delegation of authority to such Director pursuant to Section 302A.241 of the Minnesota Business Corporation Act. The Committee may also delegate non-discretionary administrative responsibilities in connection with the Plan to such other persons, agents or advisors as it may deem advisable. The Committee or any individuals to whom it has delegated duties or powers as aforesaid may employ one or more individuals to render advice with respect to any responsibility the Committee or such individuals may have under the Plan.

Article 4. Shares Subject to The Plan, Maximum Awards and Minimum Vesting Standards

4.1    Number of Shares Authorized and Available for Awards. Subject to adjustment as provided under Section 4.4, the total number of Shares that may be the subject of Awards and issued under the Plan shall be 7,000,000 Shares. Such Shares may be authorized and unissued Shares. Any of the authorized Shares may be used for any type of Award under the Plan, and any or all of the Shares may be allocated to Incentive Stock Options. Solely for the purpose of determining the number of Shares available for Awards under this Section 4.1, the number of shares available for issuance under the Plan shall be reduced by one (1.00) Share for every one (1.00) Share granted in respect of an Award.

4.2    Share Usage. In determining the number of Shares available for grant under the Plan at any time, the following rules shall apply:

(a)    Any Shares subject to an Award granted under the Plan or the Prior Plans that on or after the Effective Date terminates by expiration, forfeiture, cancellation or otherwise without the issuance of the Shares (or with the forfeiture of Shares in connection with a Restricted Stock Award), is settled in cash in lieu of Shares, or is exchanged with the

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Committee’s permission, prior to the issuance of Shares, for an Award not involving Shares shall become available again for grant under the Plan.

(b)    Any Shares withheld by the Company or tendered by a Participant (by either actual delivery or attestation) to satisfy tax withholding obligations associated with an Award granted under the Plan or Prior Plan, shall become available again for grant under the Plan.

(c)    Any Shares that are withheld by the Company or tendered by a Participant (by either actual delivery or attestation) on or after the Effective Date to pay the Exercise Price of an Option granted under the Plan or Prior Plan shall not become available again for grant under the Plan.

(d)    Any Shares that were subject to the exercise of an SAR granted under the Plan or Prior Plan that were not issued in connection with such exercise shall not become available again for grant under the Plan.

(e)    Any Shares that are purchased by the Company on the open market with the proceeds from the exercise of a Stock Option shall not become available again for grant under the Plan.

(f)    Shares subject to Substitute Awards shall not be counted against the share reserve specified in Section 4.1, nor shall they reduce the Shares authorized for grant to a Participant in any calendar year.

4.3    Annual Award Limits. Subject to adjustment as set forth in Section 4.4, the following limits (each an “Annual Award Limit” and, collectively, “Annual Award Limits”) shall apply to grants of such Awards under the Plan:

(a) The maximum aggregate number of Shares for which Options or SARs may be granted to any Participant in any calendar year shall be 2,000,000 Shares (for avoidance of the doubt, this limit applies, in the aggregate, to all Awards subject to this paragraph (a)).

(b) The maximum aggregate number of Shares that may be subject to Awards of Restricted Stock, Restricted Stock Units, Performance Share Units and Other Stock Based Awards that are Performance-Based Compensation and granted to any one Participant in any calendar year shall be 2,000,000 Shares (for avoidance of doubt, this limit applies, in the aggregate, to all forms of Awards subject to this paragraph (b)). The foregoing maximum shall apply to any Performance Period that is equal to a fiscal year, which maximum shall be adjusted to the corresponding fraction or multiple of that amount for any Performance Period of a different duration.

(c) The maximum aggregate amount that may be paid to any Participant in any calendar year under an Award of Performance Units, Cash-Based Awards or any other Award that is payable or denominated in cash, in each case that are Performance-Based Compensation, shall be $10,000,000 determined as of the date of payout (for avoidance of doubt, this limit applies in the aggregate, to all forms of Awards subject to this paragraph (c)). The foregoing maximum shall apply to any Performance Period that is equal to a fiscal year, which maximum shall be adjusted to the corresponding fraction or multiple of that amount for any Performance Period of a different duration. To the extent that any form of Award subject to

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this Section 4.3(c) is to be settled in Shares, either pursuant to the discretion of the Committee or an election by the applicable Participant, compliance with the limit established by this Section 4.3(c) shall be determined by calculating the dollar value of the Shares to be issued in settlement based on the Fair Market Value of such Shares as of the applicable vesting date.

4.4    Adjustments. All Awards shall be subject to the following provisions:

(a)    In the event of any equity restructuring (within the meaning of FASB ASC Topic 718) that causes the per share value of Shares to change, such as a stock dividend, stock split, reverse stock split, split up, spin-off, rights offering or recapitalization through an extraordinary dividend, the Committee, in order to prevent dilution or enlargement of Participants’ rights under the Plan, shall substitute or adjust, as applicable, (i) the number and kind of Shares or other securities that may be issued under the Plan or under particular forms of Award Agreements, (ii) the number and kind of Shares or other securities subject to outstanding Awards, (iii) the Exercise Price or Grant Price applicable to outstanding Awards, (iv) the Annual Award Limits, and (v) other value determinations applicable to outstanding Awards.In the event of any other change in corporate capitalization (including, but not limited to, a merger, consolidation, any reorganization (whether or not such reorganization comes within the definition of such term in Section 368 of the Code), or any partial or complete liquidation of the Company to the extent such events do not constitute equity restructurings or business combinations within the meaning of FASB ASC Topic 718, such equitable adjustments described in the foregoing sentence may be made as determined to be appropriate and equitable by the Committee to prevent dilution or enlargement of rights. In either case, any such adjustment shall be conclusive and binding for all purposes of the Plan. Unless otherwise determined by the Committee, the number of Shares subject to an Award shall always be a whole number.

(b)    In addition to the adjustments permitted under paragraph (a) above, the Committee, in its sole discretion, may make such other adjustments or modifications in the terms of any Awards that it deems appropriate to reflect any of the events described in Section 4.4(a), including, but not limited to, (i) modifications of performance goals and changes in the length of Performance Periods, or (ii) the substitution of other property of equivalent value (including, without limitation, cash, other securities and securities of entities other than the Company that agree to such substitution) for the Shares available under the Plan or the Shares covered by outstanding Awards, including arranging for the assumption, or replacement with new awards, of Awards held by Participants, but in either case only to the extent permitted by Section 162(m) of the Code with respect to Awards intended to qualify as Performance-Based Compensationand (iii) in connection with any sale of a Subsidiary, arranging for the

assumption, or replacement with new awards, of Awards held by Participants employed by the affected Subsidiary by the Subsidiary or an entity that controls the Subsidiary following the sale of such Subsidiary.

(c)    The determination of the Committee as to the foregoing adjustments set forth in this Section 4.4, if any, shall be conclusive and binding on Participants under the Plan.

4.5    Effect of Plans Operated by Acquired Companies. If a company acquired by the Company or any Subsidiary or with which the Company or any Subsidiary combines has shares available under a pre-existing plan approved by shareholders and not adopted in contemplation of such acquisition or combination, the shares available for grant pursuant to the terms of such pre-existing plan (as adjusted, to the extent appropriate, using the exchange ratio or other

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adjustment or valuation ratio or formula used in such acquisition or combination to determine the consideration payable to the holders of common stock of the entities party to such acquisition or combination) may be used for Awards under the Plan and shall not reduce the Shares authorized for grant under the Plan. Awards using such available shares shall not be made after the date awards or grants could have been made under the terms of the pre-existing plan, absent the acquisition or combination, and shall only be made to individuals who were not Employees or Non-Employee Directors prior to such acquisition or combination.

4.6    Minimum Vesting Standards. Any Award granted under the Plan to a Participant, other than a Participant who is a Nonemployee Director, shall be subject to a minimum vesting period of at least one year, except in the case of Substitute Awards and Awards granted solely in exchange for foregone cash compensation. Notwithstanding the immediately preceding sentence, (i) the Committee may permit and authorize acceleration of vesting of Awards pursuant to Sections 3.2(n) and 21.1 of the Plan (subject to the requirements of Article 15 in the case of Performance-Based Compensation), and (ii) the Committee may grant Awards without respect to the minimum vesting standards, with respect to Awards covering no more than five percent of the total number of Shares authorized under the Plan.

Article 5. Eligibility and Participation

5.1    Eligibility to Receive Awards. Individuals eligible to participate in the Plan shall be limited to Employees and Nonemployee Directors.

5.2    Participation in the Plan. Subject to the provisions of the Plan, the Committee may, from time to time, select from all individuals eligible to participate in the Plan, those individuals to whom Awards shall be granted and shall determine, in its sole discretion, the nature of any and all terms permissible by law and the amount of each Award.

5.3Award Agreements. The Committee shall have the exclusive authority to determine the terms of an Award Agreement evidencing an Award granted under the Plan, subject to the provisions herein. The terms of an Award Agreement need not be uniform among all Participants or among similar types of Awards.

Article 6. Stock Options

6.1    Grant of Options. Options may be granted to Participants covering such number of Shares, and upon such terms, and at any time and from time to time as shall be determined by the Committee. Each grant of an Option shall be evidenced by an Award Agreement, which shall specify whether the Option is in the form of a Nonqualified Stock Option or an Incentive Stock Option.

6.2    Exercise Price. The Exercise Price for each Option shall be determined by the Committee and shall be specified in the Award Agreement evidencing such Option; provided, however, the Exercise Price must be at least equal to 100% of the Fair Market Value of a Share as of the Option’s Grant Date, except in the case of Substitute Awards (to the extent consistent with Code Section 409A and, in the case of Incentive Stock Options, Code Section 424), and subject to adjustment as provided for under Section 4.4.

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6.3    Term of Option. The term of an Option granted to a Participant shall be determined by the Committee; provided, however, no Option shall be exercisable later than the tenth anniversary of its Grant Date.

6.4    Exercise of Option. An Option shall be exercisable at such times and be subject to such restrictions and vesting conditions as the Committee shall in each instance approve, which terms and restrictions need not be the same for each grant or for each Participant.

6.5    Payment of Exercise Price. An Option shall be exercised by the delivery of a notice of exercise to the Company or an agent designated by the Company in a form specified or accepted by the Committee, or by complying with any alternative procedures that may be authorized by the Committee, setting forth the number of Shares with respect to which the Option is to be exercised, accompanied by full payment for the Shares. Any Shares issued upon exercise of an Option are subject to Section 14.3. A condition of the issuance of the Shares as to which an Option shall be exercised shall be the payment of the Exercise Price and the payment of applicable withholding taxes. The Exercise Price of any exercised Option shall be payable to the Company in accordance with one of the following methods to the extent permitted under a Participant’s applicable Award Agreement:

(a)    In cash or its equivalent,

(b)    By tendering (either by actual delivery or by attestation) previously acquired Shares having an aggregate Fair Market Value at the time of exercise equal to the Exercise Price,

(c)    By a cashless (broker-assisted) exercise,

(d)    By authorizing the Company to withhold Shares otherwise issuable upon the exercise of the Option having an aggregate Fair Market Value at the time of exercise equal to the Exercise Price,

(e)    By any combination of (a), (b), (c) or (d), or

(f)    By any other method approved or accepted by the Committee.

Unless otherwise determined by the Committee, all payments under all of the methods indicated above shall be paid in United States dollars or Shares, as applicable.

6.6Special Rules Regarding ISOs. Notwithstanding any provision of the Plan to the contrary, an Option granted in the form of an ISO to a Participant shall be subject to the following rules:

(a)An Option will constitute an Incentive Stock Option only if the Participant receiving the Option is an Employee, and only to the extent that (i) it is so designated in the applicable Award Agreement and (ii) the aggregate Fair Market Value (determined as of the Option’s Grant Date) of the Shares with respect to which Incentive Stock Options held by the Participant first become exercisable in any calendar year (under the Plan and all other plans of the Company and its Affiliates) does not exceed $100,000. To the extent an Option granted to a Participant exceeds this limit, the Option shall be treated as a Non-Statutory Stock Option.

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(b)    No Participant may receive an Incentive Stock Option under the Plan if, immediately after the grant of such Award, the Participant would own (after application of the rules contained in Code Section 424(d)) Shares possessing more than 10% of the total combined voting power of all classes of stock of the Company or an Affiliate, unless (i) the exercise price for that Incentive Stock Option is at least 110% of the Fair Market Value of the Shares subject to that Incentive Stock Option on the Grant Date and (ii) that Option will expire no later than five years after its Grant Date.

(c)    For purposes of continued Service by a Participant who has been granted an Incentive Stock Option, no approved leave of absence may exceed three months unless reemployment upon expiration of such leave is provided by statute or contract. If reemployment is not so provided, then on the date six months following the first day of such leave, any Incentive Stock Option held by the Participant shall cease to be treated as an Incentive Stock Option and shall be treated for tax purposes as a Non-Statutory Stock Option.

(d)    If an Incentive Stock Option is exercised after the expiration of the exercise periods that apply for purposes of Code Section 422, such Option shall thereafter be treated as a Non-Statutory Stock Option.

Article 7. Stock Appreciation Rights

7.1    Grant of SARs. SARs may be granted to Participants in such number, and upon such terms, and at any time and from time to time as shall be determined by the Committee. Each grant of SARs shall be evidenced by an Award Agreement.

7.2Grant Price. The Grant Price for each grant of an SAR shall be determined by the Committee and shall be specified in the Award Agreement evidencing the SAR; provided, however, the Grant Price must be at least equal to 100% of the Fair Market Value of a Share as of the Grant Date, except in the case of Substitute Awards (to the extent consistent with Code Section 409A), and subject to adjustment as provided for under Section 4.4.

7.3    Term of SAR. The term of an SAR granted to a Participant shall be determined by the Committee; provided, however, no SAR shall be exercisable later than the tenth anniversary date of its Grant Date.

7.4    Exercise of SAR. An SAR shall be exercisable at such times and be subject to such restrictions and vesting conditions as the Committee shall in each instance approve, which terms and restrictions need not be the same for each grant or for each Participant.

7.5    Notice of Exercise. An SAR shall be exercised by the delivery of a notice of exercise to the Company or an agent designated by the Company in a form specified or accepted by the Committee, or by complying with any alternative procedures that may be authorized by the Committee, setting forth the number of Shares with respect to which the SAR is to be exercised.

7.6    Settlement of SARs. Upon the exercise of an SAR, pursuant to a notice of exercise properly completed and submitted to the Company in accordance with Section 7.5, a Participant shall be entitled to receive payment from the Company in an amount equal to the product of (a) and (b) below:

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(a)    The excess of the Fair Market Value of a Share on the date of exercise over the Grant Price.

(b)    The number of Shares with respect to which the SAR is exercised.

Payment shall be made in cash, Shares or a combination thereof as provided for under the applicable Award Agreement. Any Shares issued in payment of an SAR are subject to Section 14.3.

Article 8. Restricted Stock

8.1    Grant of Restricted Stock. Restricted Stock Awards may be granted to Participants in such number of Shares, and upon such terms, and at any time and from time to time as shall be determined by the Committee. Each grant of Restricted Stock shall be evidenced by an Award Agreement.

8.2    Nature of Restrictions. Each grant of Restricted Stock may be subject to a requirement that a Participant pay a stipulated purchase price for each Share of Restricted Stock, and shall be subject to a Period of Restriction that shall lapse upon the satisfaction of such vesting conditions as are determined by the Committee and set forth in an applicable Award Agreement. Such conditions or restrictions may include, without limitation, one or more of the following:

(a)    That the Shares of Restricted Stock may not be transferred in any fashion prior to their applicable vesting date,

(b)    That the Shares of Restricted Stock may vest only to the degree that specific performance goals are achieved,

(c)    That the Shares of Restricted Stock may vest only upon completion of a specified period of continuous employment or other service and to the degree that specific performance goals have been achieved, or

(d)    That the Shares of Restricted Stock may vest only upon completion of a specified period of continuous employment or other service.

8.3    Delivery of Shares. Unvested Shares subject to a Restricted Stock Award shall be evidenced by a book-entry in the name of the Participant with the Company’s transfer agent or by one or more stock certificates issued in the name of the Participant. Any such stock certificate shall be deposited with the Company or its designee, together with an assignment separate from the certificate, in blank, signed by the Participant, and bear an appropriate legend referring to the restricted nature of the Restricted Stock evidenced thereby. Any book-entry shall be subject to comparable restrictions and corresponding stop transfer instructions. Upon the vesting of Shares of Restricted Stock, and the Company’s determination that any necessary conditions precedent to the release of vested Shares (such as satisfaction of tax withholding obligations and compliance with applicable legal requirements) have been satisfied, such vested Shares shall be made available to the Participant in such manner as may be prescribed or permitted by the Committee. Such vested Shares are subject to Section 14.3.

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8.4    Voting Rights. As set forth in a Participant’s applicable Award Agreement, the Committee shall determine the extent to which a Participant holding Shares of Restricted Stock shall be granted the right to exercise full voting rights with respect to those Shares

Article 9. Restricted Stock Units

9.1    Grant of Restricted Stock Units. Restricted Stock Units may be granted to Participants in such number, and upon such terms, and at any time and from time to time as shall be determined by the Committee. A grant of Restricted Stock Units shall not represent the grant of Shares but shall represent a promise to deliver a corresponding number of Shares or the value of such number of Shares based upon the completion of service, performance conditions, or such other terms and conditions as specified in the applicable Award Agreement over the Period of Restriction. Each grant of Restricted Stock Units shall be evidenced by an Award Agreement.

9.2    Nature of Restrictions. Each grant of Restricted Stock Units shall be subject to a Period of Restriction that shall lapse upon the satisfaction of such vesting conditions as are determined by the Committee and set forth in an applicable Award Agreement. Such conditions or restrictions may include, without limitation, one or more of the following:

(a)    That the Restricted Stock Units may not be transferred in any fashion, subject to Section 14.1,

(b)    That the Restricted Stock Units may vest only to the degree that specific performance goals are achieved

(c)    That the Restricted Stock Units may vest only upon completion of a specified period of continuous employment or other service and to the degree that specific performance goals have been achieved, or,

(d)    That the Restricted Stock Units may vest only upon completion of a specified period of continuous employment or other service.

9.3    Voting Rights. A Participant shall have no voting rights with respect to any Restricted Stock Units granted hereunder or the Shares subject to any Restricted Stock Units granted hereunder prior to the issuance of the Shares.

9.4    Settlement and Payment of Restricted Stock Units. Unless otherwise elected by the Participant as permitted under the Award Agreement, or otherwise provided for in the Award Agreement, Restricted Stock Units shall be settled upon the date such Restricted Stock Units vest. Such settlement shall be made in Shares unless otherwise specified in the Award Agreement. Any Shares issued in settlement of Restricted Stock Units are subject to Section 14.3.

Article 10. Performance Share Units

10.1    Grant of Performance Share Units. Performance Share Units may be granted to Participants in such number, and upon such terms and at any time and from time to time as

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shall be determined by the Committee. Each grant of Performance Share Units shall be evidenced by an Award Agreement.

10.2    Value of Performance Share Units. Each Performance Share Unit shall have a value equal to the Fair Market Value of a Share on the Grant Date. The Committee shall set performance goals that, depending on the extent to which they are met over the specified Performance Period and the satisfaction of applicable service-based vesting conditions, shall determine the number of Performance Share Units that shall vest, which may be greater than the target number of Performance Share Units granted, and be paid to a Participant.

10.3    Earning of Performance Share Units. After the applicable Performance Period has ended, the number of Performance Share Units earned by the Participant over the Performance Period shall be determined as a function of the extent to which the applicable corresponding performance goals have been achieved. This determination shall be made by the Committee.

10.4    Form and Timing of Payment of Performance Share Units. The Company shall pay at the close of the applicable Performance Period, or as soon as practicable thereafter, any earned Performance Share Units in the form of Shares unless otherwise specified in the Award Agreement. Any Shares issued in settlement of Performance Share Units are subject to Section 14.3.

Article 11. Performance Units

11.1    Grant of Performance Units. Subject to the terms and provisions of the Plan, Performance Units may be granted to a Participant in such number, and upon such terms and at any time and from time to time as shall be determined by the Committee. Each grant of Performance Units shall be evidenced by an Award Agreement.

11.2    Value of Performance Units. Each Performance Unit shall have an initial notional value equal to a dollar amount determined by the Committee. The Committee shall set performance goals in its discretion that, depending on the extent to which they are met over the specified Performance Period and the satisfaction of applicable service-based vesting conditions, will determine the number of Performance Units that shall vest, the settlement value of each Performance Unit (if variable), and the settlement amount to be paid to the Participant.

11.3    Earning of Performance Units. After the applicable Performance Period has ended, the number of Performance Units earned by the Participant over the Performance Period shall be determined as a function of the extent to which the applicable corresponding performance goals have been achieved. This determination shall be made by the Committee.

11.4    Form and Timing of Payment of Performance Units. The Company shall pay at the close of the applicable Performance Period, or as soon as practicable thereafter, any earned Performance Units in the form of cash or in Shares or in a combination thereof, as specified in a Participant’s applicable Award Agreement. Any Shares issued in settlement of Performance Units are subject to Section 14.3.

Article 12. Other Stock-Based Awards and Cash-Based Awards

12.1    Grant of Other Stock-Based Awards and Cash-Based Awards.

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(a)    The Committee may grant Other Stock-Based Awards not otherwise described

by the terms of the Plan to a Participant in such amounts and subject to such terms and conditions, as the Committee shall determine. Such Awards may involve the transfer of actual Shares to Participants, or payment in cash or otherwise of amounts based on the value of Shares.

(b)    The Committee may grant Cash-Based Awards not otherwise described by the terms of the Plan to a Participant in such amounts and upon such terms as the Committee shall determine.

(c)    Each grant of Other Stock-Based Awards and Cash-Based Awards shall be evidenced by an Award Agreement and/or subject to a subplan or special provisions approved by the Committee.

12.2    Value of Other Stock-Based Awards and Cash-Based Awards.

(a)    Each Other Stock-Based Award shall be expressed in terms of Shares or units based on Shares, as determined by the Committee.

(b)    Each Cash-Based Award shall specify a payment amount or payment range as determined by the Committee. If the Committee exercises its discretion to establish performance goals, the value of Cash-Based Awards that shall be paid to the Participant will depend on the extent to which such performance goals are met and any service-based payment conditions are satisfied.

12.3    Payment of Other Stock-Based Awards and Cash-Based Awards. Payment, if any, with respect to Cash-Based Awards and Other Stock-Based Awards shall be made in accordance with the terms of the applicable Award Agreement in the form of cash, Shares or other forms of Awards under the Plan or a combination of cash, Shares and other forms of Awards. The determination of the form in which Awards subject to this Article 12 will be paid shall be made by the Committee, unless the Committee chooses to provide in an applicable Award Agreement that a Participant may elect, in accordance with such procedures and limitations as the Committee may specify, the form in which such an Award will be paid. To the extent any Award subject to this Article 12 is to be paid in other forms of Awards under the Plan, such Awards issued in payment shall be valued for purposes of such payment at their grant

date fair value. If the Committee permits a Participant to elect to receive some or all of an amount that would otherwise be payable in cash under an Award subject to this Article 12 in Shares or other forms of Awards, the Committee may also provide in the applicable Award Agreement that the Fair Market Value of the Shares or the grant date fair value of the other forms of Awards may exceed the amount of cash that otherwise would have been payable.

Article 13. Effect of Termination of Service

Each Award Agreement evidencing the grant of an Award shall provide for the following:

(a)    The extent to which a Participant shall vest in or forfeit such Award as a result of or following the Participant’s Termination of Service.

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(b)    With respect to an Award in the form of an Option or SAR, the extent to which a Participant shall have the right to exercise the Option or SAR following the Participant’s Termination of Service.

The foregoing provisions shall be determined by the Committee, shall be included in each Award Agreement entered into with each Participant, need not be uniform among all Award Agreements and may reflect distinctions based on the reasons for termination.

Article 14. Transferability of Awards and Shares

14.1    Transferability of Awards. Except as provided in Section 14.2, Awards shall not be transferable other than by will or the laws of descent and distribution or, subject to the consent of the Committee, pursuant to a domestic relations order entered into by a court of competent jurisdiction. No Awards shall be subject, in whole or in part, to attachment, execution or levy of any kind; and any purported transfer in violation of this Section 14.1 shall be null and void. The Committee may establish such procedures as it deems appropriate for a Participant to designate a beneficiary to whom any amounts payable or Shares deliverable in the event of, or following, the Participant’s death may be provided.

14.2    Committee Action. The Committee may, in its discretion, approve a Participant’s transfer, by gift, of an Award (except in the case of an ISO), on such terms and conditions as

the Committee deems appropriate and to the extent permissible with Code Section 409A and applicable securities laws, (i) to an “Immediate Family Member” (as defined below) of the Participant, (ii) to an inter vivos or testamentary trust in which the Award is to be passed to the Participant’s designated beneficiaries, or (iii) to a charitable institution. Any transferee of the Participant’s rights shall succeed and be subject to all of the terms of the applicable Award Agreement and the Plan, including restrictions on further transferability, compliance with applicable securities laws, and providing required investment representations. “Immediate Family Member” means any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or sister-in-law, including adoptive relationships, a trust in which these persons have more than fifty (50%) percent of the beneficial interest, a foundation in which these persons (or the Participant) control the management of assets, and any other entity in which these persons (or the Participant) own more than fifty (50%) percent of the voting interests.

14.3    Restrictions on Share Transferability. The Committee may impose such restrictions on any Shares acquired by a Participant under the Plan as it may deem advisable, including, without limitation, minimum holding period requirements, restrictions under applicable federal securities laws, under the requirements of any stock exchange or market upon which such Shares are then listed or traded or under any blue sky or state securities laws applicable to such Shares.

Article 15. Performance-Based Compensation and Compliance with Code Section 162(m)

15.1    Compliance with Section 162(m). Subject to Section 15.5, the provisions of the Plan are intended to ensure that all Options and SARs granted hereunder to any Participant who is a Covered Employee at the time of exercise of such Option or SAR qualify for exemption

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from the limitation on deductibility imposed by Section 162(m) of the Code and that such Options and SARs shall therefore be considered Performance-Based Compensation and the Plan shall be interpreted and operated consistent with that intention. The Committee may designate any Award (other than an Option or SAR) as Performance-Based Compensation upon grant, in each case based upon a determination that (i) the Participant is designated a Covered Employee with respect to such Award, and (ii) the Committee wishes such Award to be subject to this Article 15 and qualify for exemption from the limitation on deductibility imposed by Section 162(m) of the Code. The Committee shall have the sole authority to specify which Awards are to be granted in compliance with this Article 15 and treated as Performance-Based Compensation.

15.2    Performance Measures. The performance goals upon which the grant, payment or vesting of an Award to a Covered Employee that is intended to qualify as Performance-Based Compensation are conditioned must be based on one or more of the following Performance Measures:

(a)Aggregate product price (and other product price measures),

(b)Book value,

(c)Cash flow (including, but not limited to, operating cash flow, free cash flow, cash flow return on equity, and cash flow return on investment),

(d)Capital expenditures,

(e)Customer satisfaction,

(f)Demand-side management (including conservation and load management),

(g)Dividend yield or dividend growth,

(h)Earnings (either in aggregate or on a per-share basis),

(i)Earnings before or after either, or any combination of, interest, taxes, depreciation, or amortization,

(j)Economic value added,

(k)Employee satisfaction or engagement,

(l)Energy production availability,

(m)Energy efficiency,

(n)Environmental leadership projects and goals,

(o)Environmental standards and compliance,

(p)Expenses/costs,

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(q)Gross or net income,

(r)Gross or net operating margins,

(s)Gross or net operating profits,

(t)Gross or net revenues/sales,

(u)Individual objective performance measures

(v)Inventory turns,

(w)Margins,

(x)Market share,

(y)Net income,

(z)Operating and maintenance cost management,

(aa)Operating efficiency,

(bb)    Operating income,

(cc)    Operational performance measures,

(dd)    Pre-tax Income,

(ee)    Productivity ratios and measures,

(ff)    Profitability ratios,

(gg)    Retained earnings,

(hh)    Return measures (including, but not limited to, return on assets, total assets employed, equity, capital, invested capital, sales or revenues),

(ii)    Safety record,

(jj)    Service reliability,

(kk)    Share price (including, but not limited to, growth in share price and total shareholder return),

(ll)    Strategic business objectives (including objective project milestones),

(mm)    Transactions relating to acquisitions or divestitures, or

(nn)    Working capital.

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Any Performance Measure(s) may, as the Committee, in its sole discretion deems appropriate, (i) relate to the performance of the Company, any Affiliate or any Subsidiary as a whole or any business unit or division of the Company, any Affiliate or any Subsidiary or any combination thereof, (ii) be compared to the performance of a group of comparator companies, or published or special index, (iii) be based on change in the Performance Measure over a specified period of time and such change may be measured based on an arithmetic change over the specified period (e.g., cumulative change or average change), or percentage change over the specified period (e.g., cumulative percentage change, average percentage change or compounded percentage change), (iv) relate to or be compared to one or more other Performance Measures, or (v) any combination of the foregoing. To the extent consistent with the requirements of Section 162(m), the Committee also has the authority to provide for accelerated vesting of any Award based on the achievement of performance goals pursuant to the Performance Measures specified in this Article 15.

15.3    Evaluation of Performance. The Committee may provide in any Award intended to qualify as Performance-Based Compensation that any evaluation of performance may include or exclude the impact, if any, on reported financial results of any of the following events that occurs during a Performance Period: (a) asset write-downs, (b) litigation or claim judgments or settlements, (c) changes in tax laws, accounting principles or other laws or provisions, (d) reorganization or restructuring programs, (e) acquisitions or divestitures, (f) foreign exchange gains and losses or (g) gains and losses that are treated as extraordinary items under Accounting Standards Codification Topic 225. Such inclusions or exclusions shall be prescribed in a form and at a time that meets the requirements of Code Section 162(m) for qualification of the Award as Performance-Based Compensation.

15.4    Adjustment of Performance-Based Compensation. The Committee shall have no discretion to increase the amount payable pursuant to Awards that are intended to qualify as Performance-Based Compensation beyond the amount that would otherwise be payable upon attainment of the applicable performance goal(s). The Committee shall, however, retain the discretion to decrease the amount payable pursuant to such Awards below the amount that would otherwise be payable upon attainment of the applicable performance goal(s), either on a formula or discretionary basis or any combination, as the Committee determines, in its sole discretion.

15.5    Committee Discretion. In the event that applicable tax or securities laws change to permit Committee discretion to alter the governing Performance Measures or permit flexibility with respect to the terms of any Award or Awards to be treated as Performance-Based Compensation without obtaining shareholder approval of such changes, the Committee shall have sole discretion to make such changes without obtaining shareholder approval. In addition, in the event that the Committee determines that it is advisable to grant Awards that are not intended to qualify as Performance-Based Compensation, the Committee may make such grants without satisfying the requirements of Code Section 162(m) and base vesting on Performance Measures other than those set forth in Section 15.2.

Article 16. Nonemployee Director Awards

16.1    Awards to Nonemployee Directors.The Board shall approve all Awards to Nonemployee Directors. The terms and conditions of any grant of any Award to a Nonemployee Director shall be set forth in an Award Agreement.

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16.2    Awards in Lieu of Fees. The Board may permit a Nonemployee Director the opportunity to receive an Award in lieu of payment of all or a portion of future director fees (including but not limited to cash retainer fees and meeting fees) or other type of Awards pursuant to such terms and conditions as the Board may prescribe and set forth in an applicable sub-plan or Award Agreement. If the Board permits a Participant to elect to receive payment of all or a portion of future director fees that would otherwise be payable in cash in the form of an Award, the Board may also provide in the applicable Award Agreement that the grant date fair value of the Award may exceed the amount of cash that otherwise would have been payable.

16.3    Annual Award Limits. The maximum aggregate number of Shares for which

Awards may be granted to any Non-employee Director in any calendar year shall be 35,000 shares,except that the foregoing limitation shall not apply to cash-based director fees that the Non-employee Director elects to receive in the form of Shares or Share equivalents equal in value to such cash-based director fees.

Article 17. Effect of a Change in Control

Notwithstanding any other provision of the Plan to the contrary, the provisions of this Article 17 and Section 4.4 shall apply in the event of a Change in Control, unless otherwise determined by the Committee in its sole discretion, and set forth in the applicable Award Agreement or subplan:

(a)    Outstanding Options and SARs. Upon a Change in Control that does not involve a Corporate Transaction or that does involve a Corporate Transaction in which the Company is the surviving corporation, a Participant’s then-outstanding Options and SARs that are not vested shall immediately become fully vested (and, to the extent applicable, all performance conditions shall be deemed satisfied as if target performance were achieved) and exercisable over the exercise period set forth in the applicable Award Agreement. Upon a Change in Control that involves a Corporate Transaction in which the Company is not the surviving corporation, a Participant’s then-outstanding Options and SARs shall become fully vested and exercisable for such period of time prior to the Corporate Transaction as is deemed fair and equitable by the Committee and shall terminate at the effective time of the Corporate Transaction. The Committee shall provide written notice of the period of accelerated exercisability of Options and SARs to all affected Participants. The exercise of any Option or SAR whose exercisability is accelerated as provided in this Section 17(a) shall be conditioned upon the consummation of the Corporate Transaction and shall be effective only immediately before such consummation. Alternatively, the Committee may elect to cancel such Options or SARs and pay the Participant an amount of cash (less normal withholding taxes) equal to the excess of (i) the value, as determined by the Committee, of the consideration (including cash) received by the holder of a Share as a result of the Change in Control (or if the Company shareholders do not receive any consideration as a result of the Change in Control, the Fair Market Value of a Share on the day immediately prior to the Change in Control) over (ii) the Exercise Price of such Option or the Grant Price of the SAR, multiplied by the number of Shares subject to such Award. No payment shall be made to a Participant for any Option or SAR if the Exercise Price or Grant Price for such Option or SAR exceeds the value, as determined by the Committee, of the consideration (including cash) received by the holder of a Share as a result of Change in Control that involves a Corporate Transaction.

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(b)    Outstanding Awards, other than Options and SARs, Subject Solely to a Service Condition. Upon a Change in Control, a Participant’s then-outstanding Awards, other than Options and SARs, that are not vested and as to which vesting depends solely on the satisfaction of a service obligation by the Participant to the Company or any Subsidiary shall become fully vested and shall be settled in cash, Shares or a combination thereof, as determined by the Committee, within thirty (30) days following such Change in Control (except to the extent that settlement of the Award must be made pursuant to its original schedule in order to comply with Code Section 409A).

(c)    Outstanding Awards, other than Options and SARs, Subject to a Performance Condition. Upon a Change in Control, a Participant’s then-outstanding Awards, other than Options and SARs, that are not vested and as to which vesting depends upon the satisfaction of one or more performance conditions shall immediately vest and all performance conditions shall be deemed satisfied as if target performance was achieved andshall be settled in cash, Shares or a combination thereof, as determined by the Committee, within thirty (30) days following such Change in Control (except to the extent that settlement of the Award must be made pursuant to its original schedule in order to comply with Code Section 409A); notwithstanding that the applicable performance period, retention period or other restrictions and conditions have not been completed or satisfied.

Article 18. Dividends and Dividend Equivalents

18.1    Payment of Dividends on Restricted Stock. With respect to an Award of Restricted Stock, the Committee may grant or limit the right of a Participant to receive dividends declared on Shares that are subject to such Award to the extent the Award is not yet vested. If the Committee grants the right of a Participant to receive dividends declared on Shares subject to an unvested Award of Restricted Stock, then such dividends shall be paid to the Participant as of the applicable dividend payment dates that occur during a period determined by the Committee; provided however, that in the case of an Award of Restricted Stock as to which vesting depends upon the satisfaction of one or more performance conditions, such dividends shall be subject to the same performance conditions and service conditions, as applicable, as the underlying Award. Dividends shall be paid in cash or reinvested in additional Shares or Awards by such formula and at such time and subject to such limitations as may be determined by the Committee.

18.2    Payment of Dividend Equivalents on Awards Other than Options, SARs and Restricted Stock. Except for Options, SARs and Restricted Stock, the Committee may grant Dividend Equivalents on the units or other Share equivalents subject to an Award based on the dividends actually declared and paid on outstanding Shares. The terms of any dividend equivalents will be as set forth in the applicable Award Agreement, including the time and form of payment and whether such dividend equivalents will be credited with interest or deemed to be reinvested in additional units or Share equivalents. Dividend Equivalents payable with respect to the unvested portion of an Award whose vesting depends upon the satisfaction of one or more performance conditions shall be subject to the same performance conditions and service conditions, as applicable, as the underlying Award.

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Article 19. Beneficiary Designation

Each Participant under the Plan may, from time to time, name any beneficiary or beneficiaries (who may be named contingently or successively) to whom any benefit under the Plan is to be paid in case of his death before he receives any or all of such benefit. Each such designation shall revoke all prior designations by the same Participant, shall be in a form prescribed by the Committee, and will be effective only when filed by the Participant in writing with the Company during the Participant’s lifetime. In the absence of any such beneficiary designation, benefits remaining unpaid or rights remaining unexercised at the Participant’s death shall be paid to or exercised by the Participant’s executor, administrator or legal representative.

Article 20. Rights of Participants

20.1    Employment. Nothing in the Plan or an Award Agreement shall (a) interfere with or limit in any way the right of the Company or any Subsidiary to terminate any Participant’s employment with the Company or any Subsidiary at any time or for any reason not prohibited by law or (b) confer upon any Participant any right to continue his employment or service as a Director for any specified period of time. Neither an Award nor any benefits arising under the Plan shall constitute an employment contract with the Company or any Subsidiary and, accordingly, subject to Articles 3 and 21, the Plan and the benefits hereunder may be amended or terminated at any time in the sole and exclusive discretion of the Board or Committee without giving rise to any liability on the part of the Company, any Subsidiary, the Committee or the Board.

20.2    Participation. No individual shall have the right to be selected to receive an Award under the Plan, or, having been so selected, to be selected to receive a future Award.

20.3    Rights as a Shareholder. Except as otherwise provided herein, a Participant shall have none of the rights of a shareholder with respect to Shares covered by any Award until the Participant becomes the record holder of such Shares.

Article 21. Amendment and Termination

21.1    Amendment and Termination of the Plan and Awards.

(a)    Subject to subparagraphs (b) and (c) of this Section 21.1 and Section 21.3 of the Plan, the Board may at any time amend, suspend or terminate the Plan, and the Board or Committee may at any time amend, suspend or terminate any outstanding Award Agreement.

(b)    Without the prior approval of the Company’s shareholders and except as provided for in Section 4.4, no Option or SAR Award may be (i) amended to reduce the Exercise Price or the Grant Price thereof, as applicable; (ii) cancelled in exchange for the grant of any new Option or SAR with a lower Exercise Price or Grant Price, as applicable; or (iii) cancelled in exchange for cash, other property or the grant of any new Award at a time when the Exercise Price of the Option or the Grant Price of the SAR is greater than the current Fair Market Value

of a Share.

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(c)    Notwithstanding the foregoing, no amendment of the Plan shall be made without shareholder approval if shareholder approval is required pursuant to rules promulgated by any stock exchange or quotation system on which Shares are listed or quoted or by applicable U.S. state corporate laws or regulations, or applicable U.S. federal laws or regulations.

21.2    Adjustment of Awards Upon the Occurrence of Certain Unusual or Nonrecurring Events.

(a)    Except as may be limited by Section 162(m) of the Code with respect to Awards intended to qualify as Performance Based Compensation, the Committee may make adjustments in the terms and conditions of, and the criteria included in, Awards in recognition of unusual or nonrecurring events (including, without limitation, the events described in Section 4.4) affecting the Company or the financial statements of the Company or of changes in applicable laws, regulations, or accounting principles, whenever the Committee determines that such adjustments are appropriate in order to prevent unintended dilution or enlargement of the benefits or potential benefits intended to be made available under the Plan.

(b)    The Committee or its authorized delegate shall retain the discretion to decrease the amount payable pursuant to a Cash-Based Award below the amount that would otherwise be payable upon attainment of the applicable performance goal(s) over a Performance Period that does not exceed a term of one (1) year, either on a formula or discretionary basis or any combination, as the Committee or its authorized delegate determines is appropriate.

(c)    Any subplan may provide that the Committee or its authorized delegate shall retain the discretion to decrease the amount payable pursuant to a Cash-Based Award granted under such subplan below the amount that would otherwise be payable upon attainment of the applicable performance goal(s) over a Performance Period that does not exceed a term of one (1) year, either on a formula or discretionary basis or any combination, as the Committee or its authorized delegate determines is appropriate.

(d)    The determination of the Committee (or its authorized delegate, if applicable) as to any adjustments made pursuant to subparagraphs (a), (b) and (c) above shall be conclusive and binding on Participants under the Plan. By accepting an Award under the Plan, a Participant agrees to any adjustment to the Award made pursuant to this Section 21.2 without further consideration or action.

21.3    Awards Previously Granted. Notwithstanding any other provision of the Plan to the contrary, other than Sections 21.2 and 21.4, no termination or amendment of the Plan or an Award Agreement shall adversely affect in any material way any Award previously granted under the Plan, without the written consent of the Participant holding such Award.

21.4    Amendment to Conform to Law. Notwithstanding any other provision of the Plan to the contrary, the Board may amend the Plan and the Board or the Committee may amend an Award Agreement, to take effect retroactively or otherwise, as deemed necessary or advisable for the purpose of conforming the Plan or an Award Agreement to (i) any law relating to plans of this or similar nature, and to the administrative regulations and rulings promulgated thereunder, (ii) any applicable exchange requirements and (iii) any compensation recoupment policy adopted by the Company. By accepting an Award under the Plan, a Participant agrees to any

26    

amendment made pursuant to this Section 21.4 to the Plan and any Award without further consideration or action.

21.5    Deferred Compensation. Unless otherwise indicated in the applicable Award Agreement, it is not intended that any Award under the Plan, in form and/or operation, will constitute “deferred compensation” within the meaning of Code Section 409A and therefore, it is intended that each Award will not be subject to the requirements applicable to deferred compensation under section 409A of the Code and the regulations thereunder. If a Participant is a “specified employee” as defined under Code Section 409A and the Participant’s Award is to

be settled on account of the Participant’s separation from service (for reasons other than death) and such Award constitutes “deferred compensation” as defined under Code Section 409A, then any portion of the Participant’s Award that would otherwise be settled during the six-month period commencing on the Participant’s separation from service shall be settled as soon as practicable following the conclusion of the six-month period (or following the Participant’s death if it occurs during such six-month period).

Article 22. General Provisions

22.1Forfeiture Events.

(a)    In addition to the forfeiture events specified in paragraph (c) below, the Committee may specify in an Award Agreement that the Participant’s rights, payments and benefits with respect to an Award shall be subject to reduction, cancellation, forfeiture or recoupment upon the occurrence of certain specified events, in addition to any otherwise applicable treatment of an Award.

(b) Awards and any compensation directly attributable to Awards may be made subject to forfeiture, recovery by the Company or other action pursuant to any compensation recovery policy adopted by the Board or the Committee at any time, including in response to the requirements of Section 10D of the Exchange Act and any implementing rules and regulations thereunder, or as otherwise required by law and any Award Agreement may be unilaterally amended by the Committee to comply with any such compensation recovery policy.

(c)    If an Employee incurs an involuntary Termination of Service on account of Cause, then such Employee shall forfeit, as of the date immediately preceding such Termination of Service, the Employee’s (i) outstanding and unexercised Options and SARs, and (ii) outstanding and not yet settled Restricted Stock, RSUs, Performance Share Units, Performance Units, Cash-Based Awards and Other Stock-Based Awards granted to the Employee.

22.2Tax Withholding.

(a)    Tax Withholding Generally. The Company shall have the power and the right to deduct or withhold, or require a Participant to remit to the Company, an amount sufficient to satisfy applicable federal, state and local tax withholding requirements, domestic or foreign, with respect to any taxable event arising as a result of the grant, vesting, exercise or settlement of an Award to the Participant under the Plan.

(b)    Share Withholding. With respect to tax withholding required upon the grant, vesting, exercise or settlement of an Award granted hereunder that involves the issuance or

27    

delivery of Shares (collectively referred to as “Share Payment”), the Committee, in its discretion, may withhold, or permit the Participant to elect to have withheld from a Share Payment the number of Shares having a Fair Market Value on the date the withholding is to be determined but in no event shall such withholding exceed the maximum statutory withholding requirement.

22.3Legend. The certificates for Shares may include any legend that the Committee deems appropriate to reflect any restrictions on transfer of such Shares.

22.4Gender and Number. Except where otherwise indicated by the context, any masculine term used herein also shall include the feminine, the plural shall include the singular, and the singular shall include the plural.

22.5Severability. In the event any provision of the Plan shall be held illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining parts of the Plan, and the Plan shall be construed and enforced as if the illegal or invalid provision had not been included.

22.6Requirements of Law. The granting of Awards and the issuance of Shares under the Plan shall be subject to all applicable laws, rules and regulations, and to such approvals by any governmental agencies or national securities exchanges as may be required.

22.7Delivery of Shares. The Company shall have no obligation to issue or deliver Shares under the Plan prior to:

(a)    Obtaining any approvals from governmental agencies that the Company determines are necessary or advisable; and

(b)    Completion of any registration or other qualification of the Shares under any applicable national or foreign law or ruling of any governmental body that the Company determines to be necessary or advisable.

22.8Inability to Obtain Authority. The inability of the Company to obtain authority from any regulatory body having jurisdiction, which authority is deemed by the Company’s counsel to be necessary to the lawful issuance and sale of any Shares hereunder, shall relieve the Company of any liability in respect of the failure to issue or deliver such Shares as to which such requisite authority shall not have been obtained.

22.9Investment Representations. The Committee may require any individual receiving Shares pursuant to an Award under the Plan to represent and warrant in writing that the individual is acquiring the Shares for investment and without any present intention to sell or distribute such Shares.

22.10Employees Based Outside of the United States. Notwithstanding any provision of the Plan to the contrary, in order to comply with the laws in other countries in which the Company or any Subsidiaries operate or have Employees or Directors, the Committee, in its sole discretion, shall have the power and authority to:

(a)    Determine which Subsidiaries shall be covered by the Plan;

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(b)    Determine which Employees or Directors outside the United States are eligible to participate in the Plan;

(c)    Modify the terms and conditions of any Award granted to Employees or Directors outside the United States to comply with applicable foreign laws;

(d)    Establish sub-plans and modify exercise procedures and other terms and procedures, to the extent such actions may be necessary or advisable. Any sub-plans and modifications to Plan terms and procedures established under this Section 22.10 by the Committee shall be attached to the Plan document as appendices; and

(e)    Take any action, before or after an Award is made, that it deems advisable to obtain approval or comply with any necessary local government regulatory exemptions or approvals.

Notwithstanding the above, the Committee may not take any actions hereunder, and no Awards shall be granted, that would violate applicable law.

22.11    Uncertificated Shares. To the extent that the Plan provides for issuance of certificates to reflect the transfer of Shares, the transfer of such Shares may be effected on a noncertificated basis, to the extent not prohibited by applicable law or the rules of any stock exchange.

22.12Unfunded Plan. Participants shall have no right, title or interest whatsoever in or to any investments that the Company or any Subsidiaries may make to aid it in meeting its obligations under the Plan. Nothing contained in the Plan, and no action taken pursuant to its provisions, shall create or be construed to create a trust of any kind, or a fiduciary relationship between the Company and any Participant, beneficiary, legal representative or any other individual. To the extent that any individual acquires a right to receive payments from the Company or any Subsidiary under the Plan, such right shall be no greater than the right of an unsecured general creditor of the Company or the Subsidiary, as the case may be. All payments to be made hereunder shall be paid from the general funds of the Company, or the Subsidiary, as the case may be, and no special or separate fund shall be established, and no segregation of assets shall be made to assure payment of such amounts except as expressly set forth in the Plan.

22.13No Fractional Shares. No fractional Shares shall be issued or delivered pursuant to the Plan or any Award. The Committee shall determine whether cash, Awards or other property shall be issued or paid in lieu of fractional Shares or whether such fractional Shares or any rights thereto shall be forfeited or otherwise eliminated.

22.14Retirement and Welfare Plans. Neither Awards made under the Plan nor Shares or cash paid pursuant to such Awards may be included as “compensation” for purposes of computing the benefits payable to any Participant under the Company’s or any Subsidiary’s retirement plans (both qualified and nonqualified) or welfare benefit plans unless such other plan expressly provides that such compensation shall be taken into account in computing a Participant’s benefit.

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22.15Nonexclusivity of the Plan. The adoption of the Plan shall not be construed as creating any limitations on the power of the Board or Committee to adopt such other compensation arrangements as it may deem desirable for any Participant.

22.16    No Constraint on Corporate Action. Nothing in the Plan shall be construed to: (i) limit, impair, or otherwise affect the Company’s or a Subsidiary’s right or power to make adjustments, reclassifications, reorganizations or changes of its capital or business structure, or to merge or consolidate, or dissolve, liquidate, sell or transfer all or any part of its business or assets; or, (ii) limit the right or power of the Company or a Subsidiary to take any action that such entity deems to be necessary or appropriate.

22.17Governing Law. The Plan and each Award Agreement shall be governed by the laws of the state of Minnesota excluding any conflicts or choice of law rule or principle that might otherwise refer construction or interpretation of the Plan to the substantive law of another jurisdiction.

22.18    Delivery and Execution of Electronic Documents. To the extent permitted by applicable law, the Company may (i) deliver by email or other electronic means (including posting on a website maintained by the Company or by a third party under contract with the Company) all documents relating to the Plan or any Award thereunder (including without limitation, prospectuses required by the Commission) and all other documents that the Company is required to deliver to its security holders (including without limitation, annual reports and proxy statements) and (ii) permit Participant’s to electronically execute applicable Plan documents (including, but not limited to, Award Agreements) in a manner prescribed to the Committee.

22.19No Representations or Warranties Regarding Tax Effect. Notwithstanding any provision of the Plan to the contrary, the Company, Affiliates, Subsidiaries, the Board and the Committee neither represent nor warrant the tax treatment under any federal, state, local or foreign laws and regulations thereunder (individually and collectively referred to as the “Tax Laws”) of any Award granted or any amounts paid to any Participant under the Plan including, but not limited to, when and to what extent such Awards or amounts may be subject to tax, penalties and interest under the Tax Laws.

22.20Indemnification. Subject to requirements of the laws of the state of Minnesota, each individual who is or shall have been a member of the Board, or a Committee appointed by the Board, or an officer of the Company or other person to whom authority was delegated in accordance with Article 3, shall be indemnified and held harmless by the Company against and from any loss, cost, liability, or expense that may be imposed upon or reasonably incurred by him or her in connection with or resulting from any claim, action, suit or proceeding to which he or she may be a party or in which he or she may be involved by reason of any action taken or failure to act under the Plan and against and from any and all amounts paid by him or her in settlement thereof, with the Company’s approval, or paid by him or her in satisfaction of any judgment in any such action, suit, or proceeding against him or her, provided he or she shall give the Company an opportunity, at its own expense, to handle and defend the same before he or she undertakes to handle and defend it on his/her own behalf, unless such loss, cost, liability or expense is a result of his/her own willful misconduct or except as expressly provided by statute. The foregoing right of indemnification shall not be exclusive of any other rights of indemnification to which such individuals may be entitled under the Company’s Articles of Incorporation or

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Bylaws, as a matter of law or otherwise, or any power that the Company may have to indemnify them or hold them harmless.

22.21Successors. All obligations of the Company under the Plan with respect to Awards granted hereunder shall be binding on any successor to the Company, whether the existence of such successor is the result of a direct or indirect purchase, merger, consolidation, or otherwise, of all or substantially all of the business and/or assets of the Company.

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EX-10.35

Exhibit 10.35

EXHIBIT A

XCEL ENERGY INC.

2015 OMNIBUS INCENTIVE PLAN

AWARD AGREEMENT TERMS AND CONDITIONS

These Award Agreement Terms and Conditions (“Terms and Conditions”) comprise part of an Award Agreement evidencing an Award of Restricted Stock Units and/or an Award of Performance Share Units (collectively, “Units”) granted under the Xcel Energy Inc. 2015 Omnibus Incentive Plan (the “Plan”).

1.    Granting of Award. The Company has granted to you, subject to the terms and conditions in this Award Agreement and the Plan, an Award of the number of Restricted Stock Units and/or an Award of the number of Performance Share Units as specified in the Notice of Grant to which these Terms and Conditions are attached. The grant of such Award(s) is effective as of the applicable Grant Date set forth in the Notice of Grant. As used in these Terms and Conditions, the term “Award” refers to each Award described in the Notice of Grant, and includes additional Units credited with respect to that Award upon the deemed reinvestment of Dividend Equivalents, if any, that are credited in accordance with the Notice of Grant.

2.Nature of Units and Shareholder Rights. The Units subject to the Award(s) will be credited to an account in your name maintained by the Company. This account shall be unfunded and maintained for bookkeeping purposes only, with the Units simply representing an unfunded and unsecured obligation of the Company. The Units subject to the Award(s) may not be sold, assigned, transferred, pledged or otherwise encumbered by you, and do not entitle you to any rights as a shareholder of the Company.

3.    Termination of Service.

(a)    Upon your Termination of Service due to death during any Period of Restriction or Performance Period, as applicable, your unvested Award(s) (at target levels, if applicable), including any credited Dividend Equivalent Units, shall immediately vest one hundred percent (100%) and shall be paid as soon as administratively feasible in accordance with Section 5(b) hereof.

(b)    Upon your Termination of Service due to Disability during any Period of Restriction or Performance Period, as applicable, your unvested Award(s) (at target levels, if applicable), together with any credited dividend equivalent units, shall immediately vest one hundred percent (100%) and shall be paid to you (or your personal representative) as soon as administratively feasible in cash, shares or a combination thereof as provided in Section 5(a) hereof.

(c)    Except as may otherwise be provided in the Notice of Grant, upon a Termination of service due to your Retirement (as defined in the Notice of Grant or, if not defined there, as defined in any retirement plan of Xcel Energy in which you participate):

(i)any unvested Performance Share Unit Award will continue to be eligible to vest on the applicable Vesting Date in accordance with the terms of the applicable Performance Goal Annex if your Retirement occurs after the expiration of the applicable Performance Period but before the applicable Vesting Date; and

(ii)any unvested Restricted Stock Unit Award shall be forfeited on the date of your Retirement.

(d)    Upon your Termination of Service prior to the Vesting Date of an Award under any circumstances other than those set forth in Sections 3(a), (b) and (c) above, such unvested Award shall be forfeited on the date of such termination.

4.Vesting of Awards.

(a)    Subject to Section 3 above, a Performance Share Unit Award shall vest only if, and to the extent, any one or more of the performance goals set forth in the Performance Goal Annex have been achieved during the applicable Performance Period and such performance is certified in writing by the Committee. If, and to the extent that, any one or more of the performance goals have not been achieved during the applicable Performance Period, your rights to the portion of the Award tied to such unachieved performance goal shall be immediately and irrevocably forfeited as of the last day of such Performance Period (unless previously forfeited pursuant to Section 3 above). The Committee shall determine, in its sole discretion, and certify in accordance with the requirements of Section 162(m) of the Code, whether and to what extent the performance goals have been satisfied as soon practicable after the completion of the applicable Performance Period (the date on which the Committee certifies the satisfaction of the performance goals set forth on the attached Performance Goal Annex shall be the “Vesting Date” for the applicable Performance Share Unit Award).

(b)    Subject to Section 3 above, a Restricted Stock Unit Award shall vest only if, and to the extent that, any one or more of the vesting conditions set forth in the Notice of Grant or, if applicable, in a Vesting Conditions Annex have been satisfied during the applicable Period of Restriction or Performance Period. If, and to the extent that, any one or more of the vesting conditions have not been satisfied during the applicable Period of Restriction or Performance Period, your rights to any portion of the Award tied to such unachieved vesting condition shall be immediately and irrevocably forfeited as of the applicable Vesting Date (unless previously forfeited pursuant to Section 3 above).

5.    Payment of Vested Awards.

(a)    Timing of payment. Unless and to the extent you have made an effective election to defer the settlement of the Award as provided in Section 5(c) below, as soon as administratively feasible following the Vesting Date, but in no event later than March 15th of the year following the calendar year in which the Performance Period or Period of Restriction, as applicable, expires, the Company shall cause to be paid to you in settlement of each Unit (including any credited Dividend Equivalent Units) comprising a vested Award, one Share or cash in an amount equal to the Fair Market Value as of the Vesting Date of one such Share (or a combination of cash and Shares with respect to the entire Award), the form of such payment to be as determined by the Committee or, in connection with a Performance Share Unit Award, according to your election made to the extent permitted and within the parameters determined by the Committee and set forth in the applicable Performance Goal Annex. Payments shall be made in a lump sum.

(b)    Payment upon Death. In the event of your death, amounts that otherwise would have become payable to you in accordance with Section 3(b) of these Terms and Conditions will be paid in cash, Shares or a combination thereof, to your designated beneficiary (if such beneficiary has been designated in writing in accordance with the Plan, and such writing has been delivered to the Company’s Executive Compensation department), or if no beneficiary is designated, in accordance with Article 19 of the Plan.

(c)    Deferral Election. If you are determined by the Committee in its sole discretion to be eligible, you may elect to defer to a later date the settlement of Awards that would otherwise occur as provided in Section 5(a), provided that any such election and deferral shall comply with the requirements of Section 409A of the Code.

6.Changes in Capitalization of the Company. If there is any equity restructuring or other change in the Company’s corporate capitalization as described in Section 4.4(a) of the Plan, the Committee shall determine the appropriate adjustment, if any, to each Award as provided in Section 4.4 of the Plan.

7.Change in Control. Notwithstanding anything herein to the contrary, in the event of a Change in Control, the Award(s) specified in the Notice of Grant shall be dealt with as provided in Article 17 of the Plan. If the vesting of an Award is subject, in whole or in part, to the satisfaction of a performance condition, that Award shall be subject to Section 17(c) of the Plan and applicable performance conditions shall be deemed to have been satisfied as if target performance had been achieved in connection with the Change in Control.

8.    Recoupment; Cancellation.

(a)Xcel Energy may recover any cash or shares awarded under this Agreement, or proceeds from the sale of such shares, at any time, to the extent required by any rule of the SEC or any listing standard of the securities exchange upon which Xcel Energy’s stock is listed, including any rule or listing standard requiring recovery of incentive compensation in connection with an accounting restatement due to material noncompliance of Xcel Energy with any financial reporting requirement under the securities laws, which recovery shall be subject to the terms of any policy of Xcel Energy implementing such rule or listing standard. In addition, Xcel Energy may recover cash or shares awarded under these Terms and Conditions or the Agreement, or proceeds from the sale of such shares, from you if your are terminated from Xcel Energy for fraud or misconduct.

(b)Xcel Energy may recover any cash or shares awarded under this Agreement, or proceeds from the sale of such shares, for a period of 3 years following the Vesting Date of the Award or of a previously settled Award from you if you are employed by Xcel Energy at the time that the Committee, in its sole discretion, determines that (i) one or more Performance Goals used for determining the achievement of the Award or previously paid Award was miscalculated, (ii) if calculated correctly, there would have been a lower payment, and (iii) such overpayment is sufficiently material as to warrant recoupment. Xcel Energy may effectuate this provision by cancelling all or any part of this Award that has not been settled (and Shares delivered) including any associated dividend equivalent units.

(c)Xcel Energy may cancel all or any part of this Award that has not been settled (and Shares delivered) including any associated dividend equivalent units, if at any time subsequent to the grant date the Committee determines, in its sole discretion, that you engaged in fraud or misconduct that resulted in, or was reasonably likely to result in, a material adverse impact (whether financial, operational or reputational) to Xcel Energy or your business area or functional area.

This Section 8 applies to any and all outstanding Awards granted under this Plan or the Prior Plan (“Prior Awards”), and the Award Agreements evidencing all such Prior Awards have been amended to include such provisions and remedies contained in this Section 8 of this Agreement, which are in addition to and do not supersede any other remedies contained or referenced in the Award Agreements for such Prior Awards.

9.Withholding. Xcel Energy may require you to remit to it, or may withhold from the settlement of an Award or from your other compensation, an amount sufficient to satisfy any applicable federal, state or local tax, employment, FICA or other mandated withholding requirements in regard to the Award(s) in the year or years the Award(s) become taxable to you. You may elect in accordance with the Plan to satisfy the withholding requirement, in whole or in part, by having the Company withhold Shares otherwise payable in settlement of an Award at the rate the Committee determines satisfies applicable withholding requirements of the Code. For this purpose, Awards will be valued using the Fair

Market Value of a Share as of the applicable withholding date. If no election is made, you will be deemed to have elected Shares to be withheld.

10.Plan Incorporated by Reference; Electronic Delivery. The Award(s) specified in the Notice of Grant and this Award Agreement are subject in all respects to the terms and conditions of the Plan, which is controlling, and which shall be deemed incorporated into this Award Agreement. The Company, or a third party designated by the Company, may deliver to you by electronic means any documents related to your participation in the Plan. You acknowledge receipt of a copy of the Plan.

11.No Right to Employment. Nothing in this Award Agreement shall limit the right of Xcel Energy to terminate your employment or other service with Xcel Energy as provided in Section 20.1 of the Plan.

12.    Restrictions on Transfer of Award. The Award may not be sold, assigned, transferred, pledged or otherwise encumbered by you prior to the Vesting Date.

13.    Section 409A of the Code. Notwithstanding anything to the contrary in this Award Agreement, with respect to any Award specified in the Notice of Grant that constitutes a deferral of compensation subject to Code Section 409A:

(i)    If any amount is payable under such Award upon a Termination of Service, a Termination of Service will be deemed to have occurred only at such time as you have experienced a “separation from service” as such term is defined for purposes of Code Section 409A.

(ii)    If any amount shall be payable with respect to such Award as a result of your “separation from service” at such time as you are a “specified employee” within the meaning of Code Section 409A, then no payment shall be made, except as permitted under Code Section 409A, prior to the first business day after the earlier of (i) the date that is six months after your separation from service or (ii) your death.

(iii)    If any amount shall be payable with respect to such Award as a result of a Change in Control, a Change in Control shall be deemed to have occurred only after giving effect to the final sentence of Section 2.8 of the Plan.

14.    Participant Acceptance. You shall signify acceptance of this Award Agreement, including, if applicable to you, that you will abide by the Xcel Energy Stock Ownership Policy, by signing in the space provided in the Award Agreement and returning a signed copy to the Company, or if available, by providing an electronic signature, within the time frames specified by the Company’s Executive Compensation department.

15.    Mandatory Binding Arbitration. You agree that any and all disputes related to the Award(s) including but not limited to, eligibility, vesting, distribution and payment, withholding, targets, effect of termination of employment or rights related to an amendment or termination of the Plan, will be subject to mandatory binding arbitration in Minneapolis, Minnesota before the American Arbitration Association. You agree that you will be responsible for bearing your share of the costs to arbitrate.

16.    Severability. Any provision of this Award Agreement that is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

17.    Securities Law Matters. The Company shall not be required to deliver any Shares until the requirements of any federal or state securities or other laws, rules or regulations (including the rules of any securities exchange), as may be determined by the Company to be applicable, are satisfied.

18.    Headings.Headings are given to sections and subsections of these Terms and Conditions and other portions of the Award Agreement solely as a convenience to facilitate reference. Such headings shall not be deemed in any way material or relevant to the construction or interpretation of this Award Agreement or any provision thereof.

19.    Definitions.

(a) The term “Committee” shall also include those persons to whom authority has been delegated under the Plan.

EX-10.36

Exhibit 10.36

STOCK PROGRAM

FOR NONEMPLOYEE DIRECTORS OF

XCEL ENERGY INC.

(As Amended and Restated Effective December 12, 2017)

ARTICLE I

PURPOSE, DEFINITIONS AND GENERAL PROVISIONS

1.1.Purpose. The purposes of this Program are: (a) to enable a portion of the compensation of each Nonemployee Director of Xcel Energy Inc. to be tied to the performance of the common stock of the Company; and (b) to permit each such Nonemployee Director to defer receipt of all or a portion of his/her retainer, board or committee meeting fees.

The Company intends the Program to be compliant with Section 409A of the Internal Revenue Code and the regulations and other guidance issued thereunder. This Program is considered a “subplan” of the Xcel Energy Inc. 2015 Omnibus Incentive Plan (the “Plan”) as such term is used in the Plan, and a successor plan to the Stock Equivalent Plan for Non- Employee Directors of Xcel Energy Inc. (the “Predecessor Plan”). The terms and conditions of the Program shall be considered part of an Award Agreement under the Plan with respect to any Program Award to any Nonemployee Director. Except as otherwise provided, any capitalized term used herein shall have the same meaning as given the term by the Plan.

1.2. Definitions.

(a) "Award" for purposes of the Program shall mean a Deferral Award or an Equity Award.

(b) "Award Date" shall mean with respect to an Equity Award, the Grant Date of such an Award as specified in or pursuant to an action by the Board, and shall mean with respect to a Deferral Award the date the Compensation subject to the Deferral Award would otherwise have been paid to the Nonemployee Director as specified in or pursuant to an action by the Board.

(c) "Beneficiary" shall mean the last person or persons (including, without limitation, the trustees of any testamentary or inter vivos trust) designated in writing by a Participant, on a form approved by and filed with the Company, to receive payments under the Plan after the death of such Participant, or, in the absence of any such designation or in the event that such designated persons or person shall predecease such Participant, or shall not be in existence or shall otherwise be unable to receive such payments, the person or persons designated under such Participant's last will and testament or, in the absence of such designation, to the Participant's estate. Any Beneficiary designation may be changed from time to time by like notice similarly delivered.

(d) "Compensation" shall mean payments of cash which a Nonemployee Director receives or is entitled to receive from the Company for services as a member of its Board. Such payments may include directors' retainers, including annual retainers and retainers for committee, chair or lead director service, board

meeting fees and committee meeting fees, but shall exclude direct reimbursement of expenses.

(e) "Deferral Award" shall mean an Award of Stock Equivalents made pursuant to a deferral election described in Section 1.4 hereof.

(f) "Equity Award" shall mean an Award of Stock or Stock Equivalents made pursuant to an election described in Section 1.3 hereof.

(g) “Effective Date” shall mean the date this Program as amended becomes effective, as provided in Section 3.9.

(h) "Participant" shall mean any Nonemployee Director who receives an Award.

(i) “Plan” shall mean the Xcel Energy Inc. 2015 Omnibus Incentive Plan, as from time to time amended and in effect.

(j) "Program" shall mean this Stock Program for Non-Employee Directors of the Company, as from time to time amended and in effect.

(k) "Stock Account" shall mean the bookkeeping account to which Stock Equivalent Awards are credited in the name of a Participant as described in Section 2.2 of this Program.

(l) "Stock Equivalents" shall mean the units, representing a like number of Shares, that are credited to a Nonemployee Director's Stock Account under Article II of this Plan.

(m) "Xcel Energy Stock" shall mean the common stock of the Company, par value $2.50 per share. Each share of Xcel Energy Stock is referred to as a “Share.”

1.3.Equity Awards. Subject to Section 16.3 of the Plan, the Board may make Equity Awards to Participants from time to time in such amount and number as the Board shall determine in its sole discretion. If such an award is made by the Board, then a Participant may elect to receive the award in the form of Xcel Energy Stock, Stock Equivalents or some combination of the two. Prior to the beginning of a calendar year in which an Equity Award is to be granted, each Participant eligible to receive an Equity Award must elect what portion of such award will be granted to the Participant in shares of Xcel Energy Stock and what portion of such award will be granted to the Participant in Stock Equivalents. Notwithstanding the preceding sentence, in the case of an individual who becomes a Nonemployee Director after the first day of a calendar year, a deferral election must be made within 30 days of the date such individual becomes a Nonemployee Director, and shall be effective only as to any Equity Award received in connection with such director’s election to the board of directors, subject to such terms and conditions as may be further described herein. Such election shall be made on a form approved by and filed with the Company and shall continue in effect until the Nonemployee Director's “separation from service” (as the term is defined for purposes of Section 409A of the Code) as a member of the Board (a “Termination of Service”) or, if the Nonemployee Director provides the Company with earlier written notice to change the election, the end of the calendar year in which such written notice is received by the Company. In the absence of a deferral election, Equity Awards shall be paid as shares of common stock for any given year.

1.4.Deferral Awards. In accordance with this Section, a Nonemployee Director may elect to receive Deferral Awards in lieu of all or a portion of his/her Compensation by filing with the Company an election in writing on a form approved by the Company. Unless the Committee specifies a greater amount, Deferral Awards shall be made in a dollar amount equal to the amount of Compensation the Nonemployee Director has elected to defer and shall be converted into Stock Equivalents and credited to a Participant's Stock Account as provided in Section 2.2. A deferral election with respect to Compensation for a calendar year must be made prior to the beginning of that calendar year. Notwithstanding the preceding sentence, in the case of an individual who becomes a Nonemployee Director after the first day of a calendar year, a deferral election must be made within 30 days of the date such individual becomes a Nonemployee Director, and shall be effective only as to Compensation for services performed after the date the election is made. A deferral election shall continue in effect until the Nonemployee Director's Termination of Service or, if the Nonemployee Director provides the Company with earlier written notice to discontinue or change the deferral election, the end of the calendar year in which such written notice is received by the Company. In the absence of a deferral election, the Compensation shall be paid in cash for any given year.

ARTICLE II

TREATMENT OF AWARDS

2.1Stock Accounts. The Company shall establish on its books a Stock Account in the name of each Participant to reflect the Company's liability to each Participant who has received an Award of Stock Equivalents. To this Stock Account shall be credited each Deferral Award and the portion of an Equity Award granted in the form of Stock Equivalents, plus other items as described hereafter. A Participant's Stock Account may be divided into two or more subaccounts as the Board determines necessary or desirable for the administration of the Program. Payments to a Participant or Beneficiary upon settlement of Stock Equivalents following Termination of Service shall be debited to the Stock Account. In addition, debits and credits to the Stock Account shall be made in the manner provided hereafter. Despite the maintenance of such Stock Account for each Participant, the Company's obligation to make distributions under the Program shall be made from the Company's general assets and property. The Company may, in its sole discretion, establish a separate fund or account to make payment to a Participant or Beneficiary hereunder. Whether the Company, in its sole discretion, does establish such a fund or account, no Participant or Beneficiary or any person shall have, under any circumstances, any interest whatever in any particular property or assets of the Company by virtue of this Program or of the Plan.

2.2 Crediting of Awards.

(a)An Award in the form of Stock Equivalents (whether from a Deferral Award or the portion of an Equity Award granted in the form of Stock Equivalents) shall be credited to a Participant's Stock Account as of the applicable Award Date. If such an Award is originally expressed in dollars, it shall be converted into a number of Stock Equivalents by dividing the dollar amount of such Award by the Fair Market Value of a Share on the applicable Award Date, calculated to three decimal places. The resulting number of Stock Equivalents shall be credited to the Participant's Stock Account as of the applicable Award Date.

(b)The Shares subject to the portion of an Equity Award granted in the form of Xcel Energy Stock shall be issued to a Participant as soon as administratively practicable following the applicable Award Date. Delivery of the Shares may occur by electronic delivery of such

Shares to a brokerage account designated by the Participant, or book-entry registration of such Shares in the Participant’s name with the Company’s transfer agent.

2.3 Crediting of Dividend Equivalents/Capitalization Adjustments.

(a)On each date on which a dividend in cash or property (other than a stock dividend) is distributed by the Company on issued and outstanding Shares, the Stock Account of a Participant shall be credited, subject to Section 2.3(b), with additional Stock Equivalents as follows: (i) the dollar amount of the fair market value of the cash or property so distributed per issued and outstanding Share shall be multiplied by the number of Stock Equivalents (including fractions) in the Participant's Stock Account on the record date for such distribution; (ii) this dollar amount shall then be converted into Stock Equivalents equal to the number of Shares, calculated to three decimal places, that could be purchased on the payment date for such distribution by dividing such dollar amount by a price per share equal to the Fair Market Value on such payment date.

(b)If an equity restructuring (within the meaning of FASB Topic 718) affecting the Shares such as stock split or stock dividend occurs, the Board shall, in accordance with Section 4.4 of the Plan, appropriately adjust the number of Stock Equivalents in each Participant’s Stock Account to prevent dilution or enlargement of Participants’ rights under the Program. The Board may make similar adjustments in connection with other changes in the Company’s corporate capitalization as provided in Section 4.4 of the Plan.

2.4Change in Ownership. If the Company shall be a party or subject to any consolidation, merger, share exchange or other transaction which, in any case, constitutes either a “change in the ownership” of the Company or a “change in the ownership of a substantial portion of the assets” of the Company within the meaning of Section 409A of the Code (a “Change in Ownership”), then in connection with such transaction either (i) the acquiring, surviving or successor corporation (or its direct or indirect parent corporation) shall continue the Program in accordance with Section 22.21 of the Plan and the Stock Equivalents in each Participant's Stock Account on the day immediately preceding the effective date of such transaction shall be converted into an appropriate number of stock equivalents of such other entity, or (ii) the Board shall terminate the Program and the entire remaining balance in each Participant's Stock Account shall be paid in a single distribution to the Participant in Shares, cash or a combination of both within the time periods permitted by and otherwise in accordance with the requirements of Section 409A of the Code. For purposes of any cash payment made pursuant to this Section 2.4, the value of a Stock Equivalent shall be computed as the greater of (a) the Fair Market Value on or nearest the date on which the Change in Ownership is deemed to occur, or (b) the highest per Share amount actually paid in connection with the Change in Control.

2.5 Time of Payment of Awards.

(a)Except as provided in Section 2.7, any Awards involving the grant of Stock Equivalents shall not be payable to a Participant prior to the Participant's Termination of Service.

(b)Upon a Termination of Service, except as provided in subsection (c) below, the balance of a Participant's Stock Account shall be paid in the manner selected by the Participant, which may either be in the form of a lump sum or in substantially equal annual installments payable over a period that may range between 2 and 10 years. Such lump sum payment shall be made, or such installment payments shall commence, between January 1st

and March 31st of the year following Termination of Service, with subsequent installment payments made during the same time period each year. The number of Shares and cash in lieu of any fractional Stock Equivalent to be distributed shall be calculated as set forth in Section 2.6. A Participant may only make one distribution election, and once made, such election shall be irrevocable. Any distribution election must be made at the earlier of (i) the time the Participant makes his or her initial deferral election under section 1.4, or (ii) prior to the beginning of the calendar year for which the Participant first receives an Equity Award denominated in Stock Equivalents. The distribution election must be made in writing on a form approved by the Company.

(c)Notwithstanding any election made by a Participant, in the event of a Participant's death prior to payment in full of a Participant's Stock Account, the entire remaining balance in the Participant's Stock Account shall be paid in a single distribution to the Participant's Beneficiary within 90 days after the Participant’s death (and in no event shall the Beneficiary directly or indirectly be permitted to designate the year of payment).

2.6Form of Payment. Except as otherwise provided in the Program, Awards shall be payable to a Participant only as a distribution of whole Shares equal to the number of whole Stock Equivalents credited to the Participant's Stock Account to be distributed, and cash for any fractional Stock Equivalent to be distributed. In converting a fractional Stock Equivalent in a Participant's Stock Account into cash for payment purposes, such conversion shall be based on the Fair Market Value of a Share on the distribution date.

2.7Acceleration of Payments. In the event of a Participant's Disability, the Board shall accelerate the payment of such Participant's Stock Account balance in a lump sum to such Participant within 90 days following the Participant’s Disability.

ARTICLE III

OTHER PROVISIONS

3.1Amendment or Termination. The Board may amend or terminate this Program at any time; provided, however, that no amendment or termination shall adversely affect any prior Awards or rights under this Program. Any termination of this Program shall comply in all respects to the requirements of Section 409A of the Code and the regulations issued thereunder to the extent applicable.

3.2Expenses. The expenses of administering the Program shall be borne by the Company, and shall not be charged against any Participant's Awards.

3.3No Trust. No action by the Company or the Board under this Program shall be construed as creating a trust, escrow or other secured or segregated fund or other fiduciary relationship of any kind in favor of any Participant, Beneficiary, or any other persons otherwise entitled to Awards. The status of the Participant and Beneficiary with respect to any liabilities assumed by the Company hereunder shall be solely those of unsecured creditors of the Company. Any asset acquired or held by the Company in connection with liabilities assumed by it hereunder, shall not be deemed to be held under any trust, escrow or other secured or segregated fund or other fiduciary relationship of any kind for the benefit of the Participant or Beneficiary or to be security for the performance of the obligations of the Company, but shall be, and remain, a general, unpledged, unrestricted asset of the Company at all times subject to the claims of general creditors of the Company.

3.4.No Impact on Directorship. This Program shall not be construed to confer any right on the part of a Participant to be or remain a Director or to receive any, or any particular rate of, Compensation.

3.5.Administration. The Board shall administer this Program in accordance with Article 3 of the Plan.

3.6.Shareholder Rights. A Participant shall not be deemed for any purpose to be or have rights as a shareholder of the Company as a result of the crediting of Stock Equivalents to the Participant’s Stock Account, until and unless the Participant becomes the record holder of the underlying Shares as provided in Section 20.3 of the Plan.

3.7.Securities Laws. Distribution of Shares to a Participant upon distribution of his/her Stock Account shall be subject to compliance with applicable laws and stock exchange rules as provided in Article 22 of the Plan.

3.8Relationship to the Plan. This Program has been adopted pursuant to the Plan, and the Program and all Awards hereunder are subject to the terms of the Plan. If there is any conflict or inconsistency between the terms of the Program and the terms of the Plan, the terms of the Plan shall control.

3.9Effective Date. This Program was originally effective as of May 20, 2015 upon approval of the Plan by the shareholders of the Company at the 2015 annual meeting of shareholders of the Company, and amended with such amendment effective as of December 12, 2017.

EX-21.01

Exhibit 21.01

SUBSIDIARIES OF XCEL ENERGY INC.

SUBSIDIARY (a)	STATE OF INCORPORATION	PURPOSE
Northern States Power Company (a Minnesota corporation)	Minnesota	Electric and gas utility
Northern States Power Company (a Wisconsin corporation)	Wisconsin	Electric and gas utility
Public Service Company of Colorado	Colorado	Electric and gas utility
Southwestern Public Service Company	New Mexico	Electric utility
WestGas InterState, Inc.	Colorado	Natural gas transmission company
Xcel Energy Wholesale Group Inc.	Minnesota	Intermediate holding company for subsidiaries providing wholesale energy
Xcel Energy Markets Holdings Inc.	Minnesota	Intermediate holding company for subsidiaries providing energy marketing services
Xcel Energy International Inc.	Delaware	Intermediate holding company for international subsidiaries
Xcel Energy Ventures Inc.	Minnesota	Intermediate holding company for subsidiaries developing new businesses
Xcel Energy Retail Holdings Inc.	Minnesota	Intermediate holding company for subsidiaries providing services to retail customers
Xcel Energy Communications Group Inc.	Minnesota	Intermediate holding company for subsidiaries providing telecommunications and related services
Xcel Energy WYCO Inc.	Colorado	Intermediate holding company holding investment in WYCO
Xcel Energy Services Inc.	Delaware	Service company for Xcel Energy system
Xcel Energy Transmission Holding Company, LLC	Delaware	Intermediate holding company for subsidiaries developing and providing energy transmission services
Xcel Energy Venture Holdings, Inc.	Minnesota	Intermediate holding company holding investment in Energy Impact Fund
Nicollet Project Holdings, LLC	Minnesota	Intermediate holding company holding investment in Nicollet Project I, LLC and II, LLC
Nicollet Holdings Company, LLC	Minnesota	Intermediate holding company for subsidiaries procuring equipment for renewable generation facilities at other subsidiaries

^(a)  Certain insignificant subsidiaries are omitted.

EX-23.01

Exhibit 23.01

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in:

Registration Statements on Form S-8:

• No. 333-222157 (relating to the Xcel Energy Inc. Nonqualified Deferred Compensation Plan)

• No. 333-185610 (relating to the Nuclear Management Company, LLC NMC Savings and Retirement Plan)

• No. 333-213382 (relating to the Xcel Energy 401(k) Savings Plan; and New Century Energies, Inc. Employees’ Savings and Stock Ownership plan for Bargaining Unit Employees and Former Non-Bargaining Unit Employees; and New Century Energies, Inc. Employee Investment Plan for Bargaining Unit Employees and Former Non-Bargaining Unit    Employees)

• No. 333-127217 (relating to the Xcel Energy 2005 Long-Term Incentive Plan)

• No. 333-115754 and 333-175189 (relating to Stock Equivalent Plan for Non-Employee Directors)

• No. 333-204325 (relating to the Xcel Energy 2015 Omnibus Incentive Plan)

Registration Statements on Form S-3:

• No. 333-224333 (relating to senior debt securities, junior subordinated debt securities and common stock)

• No. 333-214019 (relating to the Xcel Energy Dividend Reinvestment and Stock Purchase Plan)

of our reports dated February 22, 2019, relating to the consolidated financial statements and financial statement schedules of Xcel Energy Inc. and subsidiaries, and the effectiveness of Xcel Energy Inc. and subsidiaries’ internal control over financial reporting, appearing in this Annual Report on Form 10-K of Xcel Energy Inc. for the year ended December 31, 2018.

/s/ DELOITTE & TOUCHE LLP

Minneapolis, Minnesota

February 22, 2019

EX-24.01

Exhibit 24.01

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ BEN FOWKE

Ben Fowke

Chairman, President, Chief Executive Officer and Director

1

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ LYNN CASEY

Lynn Casey

Director

2

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ RICHARD K. DAVIS

Richard K. Davis

Director

3

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ RICHARD T. O'BRIEN

Richard T. O’Brien

Director

4

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ DAVID K. OWENS

David K. Owens

Director

5

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ CHRISTOPHER J POLICINSKI

Christopher J. Policinski

Director

6

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ JAMES PROKOPANKO

James Prokopanko

Director

7

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ A. PATRICIA SAMPSON

A. Patricia Sampson

Director

8

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ JAMES J. SHEPPARD

James J. Sheppard

Director

9

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ DAVID A. WESTERLUND

David A. Westerlund

Director

10

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ KIM WILLIAMS

Kim Williams

Director

11

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ TIMOTHY V. WOLF

Timothy V. Wolf

Director

12

POWER OF ATTORNEY

The undersigned director and/or officer of Xcel Energy Inc., a Minnesota corporation (the “Company”), does hereby make, constitute and appoint BEN FOWKE, ROBERT C. FRENZELandSCOTT WILENSKY, and each or any one of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Form 10-K, Annual Report, or other applicable form, pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), including any and all exhibits, schedules, supplements, certifications and supporting documents thereto, including, but not limited to, the Form 11-K Annual Reports of the Company’s 401(k) Plans and similar plans pursuant to the 1934 Act, and all amendments, supplements and corrections thereto, to be filed by the Company with the Securities and Exchange Commission (the “SEC”), as required in connection with its registration under the 1934 Act, as amended, and to file the same, with all exhibits thereto and other supporting documents, with the SEC.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 20th day of February, 2019.

/s/ DANIEL YOHANNES

Daniel Yohannes

Director

13

EX-31.01

Exhibit 31.01

CERTIFICATION

I, Ben Fowke, certify that:

1. I have reviewed this report on Form 10-K of Xcel Energy Inc. (a Minnesota corporation);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: Feb. 22, 2019

/s/ BEN FOWKE

Ben Fowke

Chairman, President, Chief Executive Officer and Director

1

EX-31.02

Exhibit 31.02

CERTIFICATION

I, Robert C. Frenzel, certify that:

1. I have reviewed this report on Form 10-K of Xcel Energy Inc. (a Minnesota corporation);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: Feb. 22, 2019

/s/ ROBERT C. FRENZEL

Robert C. Frenzel

Executive Vice President, Chief Financial Officer

2

EX-32.01

Exhibit 32.01

OFFICER CERTIFICATION

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Xcel Energy Inc. (Xcel Energy) on Form 10-K for the year ended Dec. 31, 2018, as filed with the SEC on the date hereof (Form 10-K), each of the undersigned officers of Xcel Energy certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to such officer’s knowledge:

(1) The Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of Xcel Energy as of the dates and for the periods expressed in the Form 10-K.

Date:Feb. 22, 2019

/s/ BEN FOWKE

Ben Fowke

Chairman, President, Chief Executive Officer and Director

/s/ ROBERT C. FRENZEL

Robert C. Frenzel

Executive Vice President, Chief Financial Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate disclosure document.

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Xcel Energy and will be retained by Xcel Energy and furnished to the SEC or its staff upon request.

1

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 14, 2019	Jun. 29, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	XCEL ENERGY INC
Entity Central Index Key	0000072903
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Public Float			$ 23,246,479,826
Entity Common Stock, Shares Outstanding		514,211,368
Common Stock, Shares Outstanding (in shares)			508,898,420
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018

XML

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating revenues
Total operating revenues	$ 11,537	$ 11,404	$ 11,107
Operating expenses
Electric fuel and purchased power	3,854	3,757	3,718
Cost of natural gas sold and transported	843	823	733
Cost of sales — other	35	34	36
Operating and maintenance expenses	2,352	2,270	2,300
Conservation and demand side management program expenses	290	273	245
Depreciation and amortization	1,642	1,479	1,303
Taxes (other than income taxes)	556	545	532
Total operating expenses	9,572	9,181	8,867
Operating income	1,965	2,223	2,240
Other income, net	(14)	(10)	(18)
Income (Loss) from Equity Method Investments	35	30	42
Allowance for funds used during construction — equity	108	75	60
Interest charges and financing costs
Interest charges — includes other financing costs of $25, $24 and $25, respectively	700	663	647
Allowance for funds used during construction — debt	(48)	(35)	(27)
Total interest charges and financing costs	652	628	620
Income before income taxes	1,442	1,690	1,704
Income taxes	181	542	581
Net income	$ 1,261	$ 1,148	$ 1,123
Weighted average common shares outstanding:
Basic (in shares)	511	509	509
Diluted (in shares)	511	509	509
Earnings per average common share:
Basic (in dollars per share)	$ 2.47	$ 2.26	$ 2.21
Diluted (in dollars per share)	$ 2.47	$ 2.25	$ 2.21
Electricity, US Regulated [Member]
Operating revenues
Total operating revenues	$ 9,719	$ 9,676	$ 9,500
Natural Gas, US Regulated [Member]
Operating revenues
Total operating revenues	1,739	1,650	1,531
Product and Service, Other [Member]
Operating revenues
Total operating revenues	$ 79	$ 78	$ 76

XML

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest charges and financing costs
Other financing costs	$ 25	$ 24	$ 25

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income:
Net income	$ 1,261	$ 1,148	$ 1,123
Pension and retiree medical benefits:
Net pension and retiree medical losses arising during the period, net of tax of $(2), $(2), and $(5), respectively	(6)	(3)	(8)
Amortization of losses included in net periodic benefit cost, net of tax of $3, $5, and $2, respectively	9	7	4
Total pension and retiree medical benefits, net of tax	3	4	(4)
Derivative instruments:
Reclassification of losses to net income, net of tax of $1, $2, and $2, respectively	3	3	4
Net fair value decrease, net of tax of $(2), $0, and $0, respectively	(5)	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	(2)	3	4
Other comprehensive income	1	7	0
Comprehensive income	$ 1,262	$ 1,155	$ 1,123

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension and retiree medical benefits:
Net pension and retiree medical benefit (losses) gains arising during the period, tax	$ (2)	$ (2)	$ (5)
Amortization of losses included in net periodic benefit cost, tax	3	5	2
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(2)	0	0
Derivative instruments:
Reclassification of losses to net income, tax	$ 1	$ 2	$ 2

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 1,261	$ 1,148	$ 1,123
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,659	1,495	1,319
Nuclear fuel amortization	122	114	117
Deferred income taxes	218	640	587
Allowance for equity funds used during construction	(108)	(75)	(60)
Equity earnings of unconsolidated subsidiaries	(35)	(30)	(42)
Dividends from unconsolidated subsidiaries	37	41	46
Provision for bad debts	42	39	39
Share-based compensation expense	45	57	41
Net realized and unrealized hedging and derivative transactions	22	2	8
Changes in operating assets and liabilities:
Accounts receivable	(105)	(60)	(83)
Accrued unbilled revenues	9	(34)	(75)
Inventories	(65)	(3)	1
Other current assets	18	9	61
Accounts payable	90	43	118
Net regulatory assets and liabilities	223	(16)	(19)
Other current liabilities	(61)	(38)	20
Pension and other employee benefit obligations	(179)	(133)	(91)
Other, net	(71)	(73)	(58)
Net cash provided by operating activities	3,122	3,126	3,052
Investing activities
Utility capital/construction expenditures	(3,957)	(3,244)	(3,195)
Purchases of investment securities	(853)	(1,697)	(547)
Proceeds from the sale of investment securities	833	1,669	479
Other, net	(9)	(24)	2
Net cash used in investing activities	(3,986)	(3,296)	(3,261)
Financing activities
Proceeds from (repayments of) short-term borrowings, net	225	422	(454)
Proceeds from issuance of long-term debt	1,675	1,518	2,424
Repayments of long-term debt, including reacquisition premiums	(452)	(1,030)	(1,036)
Proceeds from issuance of common stock	230	0	0
Repurchases of common stock	(1)	(3)	(32)
Dividends paid	(730)	(721)	(681)
Other, net	(19)	(18)	(12)
Net cash provided by financing activities	928	168	209
Net change in cash and cash equivalents	64	(2)	0
Cash and cash equivalents at beginning of period	83	85	85
Cash and cash equivalents at end of period	147	83	85
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(633)	(616)	(592)
Cash received for income taxes, net	27	44	62
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	388	464	311
Inventory transfers to plant, property and equipment	129	63	107
Allowance for Funds Used During Construction, Investing Activities	108	75	61
Issuance of common stock for reinvested dividends and equity awards	$ 67	$ 31	$ 29

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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents		$ 147	$ 83
Accounts receivable, net		860	797
Accrued unbilled revenues		755	764
Inventories		548	610
Regulatory assets		464	424
Derivative instruments		87	44
Prepaid taxes		79	68
Prepayments and other		154	183
Total current assets		3,094	2,973
Property, plant and equipment, net		36,944	34,329
Other assets
Nuclear decommissioning fund and other investments		2,317	2,397
Regulatory assets		3,326	3,005
Derivative instruments		34	48
Deposits and other		272	278
Total other assets		5,949	5,728
Total assets		45,987	43,030
Current liabilities
Current portion of long-term debt		406	457
Short-term debt		1,038	814
Accounts payable		1,237	1,243
Regulatory liabilities	[1]	436	239
Taxes accrued		450	448
Accrued interest		174	174
Dividends payable		195	183
Derivative instruments		61	29
Other		463	501
Total current liabilities		4,460	4,088
Deferred credits and other liabilities
Deferred income taxes		4,165	3,845
Deferred investment tax credits		54	58
Regulatory liabilities	[1]	5,187	5,083
Asset retirement obligations		2,568	2,475
Derivative instruments		129	126
Customer advances		199	193
Pension and employee benefit obligations		994	1,042
Other		206	145
Total deferred credits and other liabilities		13,502	12,967
Capitalization
Long-term debt		15,803	14,520
Long-term debt		1,285	1,269
Additional paid in capital		6,168	5,898
Retained earnings		4,893	4,413
Accumulated other comprehensive loss		(124)	(125)
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 514,036,787 and 507,762,881 shares outstanding at Dec. 31, 2018 and 2017, respectively		12,222	11,455
Total liabilities and equity		$ 45,987	$ 43,030

[1] Revenue subject to refund of $29 million and $15 million for 2018 and 2017, respectively, is included in other current liabilities.

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CONSOLIDATED BALANCE SHEETS (Parenthetical)	Jun. 29, 2018 shares
Statement of Financial Position [Abstract]
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 514,036,787 and 507,762,881 shares outstanding at Dec. 31, 2018 and 2017, respectively	508,898,420

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CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2015	$ 10,601	$ 1,269	$ 5,889	$ 3,553	$ (110)
Balance (in shares) at Dec. 31, 2015		507,536
Increase (Decrease) in Stockholders' Equity
Net income	1,123			1,123
Other comprehensive income (loss)	0
Dividends declared on common stock	(694)			(694)
Issuances of common stock (in shares)		486
Issuances of common stock	16	$ 1	15
Stock Repurchased During Period, Shares		(799)
Repurchases of common stock	(32)	$ (2)	(30)
Share-based compensation	7		7
Ending balance at Dec. 31, 2016	$ 11,021	$ 1,268	5,881	3,982	(110)
Balance (in shares) at Dec. 31, 2016		507,223
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock	$ (1.36)
Net income	$ 1,148			1,148
Other comprehensive income (loss)	7				7
Dividends declared on common stock	(736)			(736)
Issuances of common stock (in shares)		611
Issuances of common stock	5	$ 1	4
Stock Repurchased During Period, Shares		(71)
Repurchases of common stock	(3)	$ 0	(3)
Share-based compensation	13		16	(3)
Adoption of ASU No. 2018-02	0			22	(22)
Ending balance at Dec. 31, 2017	$ 11,455	$ 1,269	5,898	4,413	(125)
Balance (in shares) at Dec. 31, 2017		507,763
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock	$ (1.44)
Net income	$ 1,261			1,261
Other comprehensive income (loss)	1				1
Dividends declared on common stock	(780)			(780)
Issuances of common stock (in shares)		6,296
Issuances of common stock	270	$ 16	254
Repurchases of common stock (in shares)		(22)
Repurchases of common stock	(1)	$ 0	(1)
Share-based compensation	16		17	(1)
Ending balance at Dec. 31, 2018	$ 12,222	$ 1,285	$ 6,168	$ 4,893	$ (124)
Balance (in shares) at Dec. 31, 2018		514,037
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock	$ (1.52)

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

General — Xcel Energy Inc.’s utility subsidiaries are engaged in the regulated generation, purchase, transmission, distribution and sale of electricity and in the regulated purchase, transportation, distribution and sale of natural gas.

Xcel Energy’s regulated operations include the activities of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS. These utility subsidiaries serve electric and natural gas customers in portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. Also included in regulated operations are WGI, an interstate natural gas pipeline company, and WYCO, a joint venture with CIG to develop and lease natural gas pipeline, storage and compression facilities.

Xcel Energy Inc.’s nonregulated subsidiaries include Eloigne and Capital Services. Eloigne invests in rental housing projects that qualify for low-income housing tax credits. Capital Services procures equipment for construction of renewable generation facilities at other subsidiaries. Xcel Energy Inc. owns the following additional direct subsidiaries, some of which are intermediate holding companies with additional subsidiaries: Xcel Energy Wholesale Group Inc., Xcel Energy Markets Holdings Inc., Xcel Energy Ventures Inc., Xcel Energy Retail Holdings Inc., Xcel Energy Communications Group, Inc., Xcel Energy International Inc., Xcel Energy Transmission Holding Company, LLC, Nicollet Holdings Company, LLC, Nicollet Project Holdings LLC and Xcel Energy Services Inc. Xcel Energy Inc. and its subsidiaries collectively are referred to as Xcel Energy.

Xcel Energy’s consolidated financial statements include its wholly-owned subsidiaries and VIEs for which it is the primary beneficiary. All intercompany transactions and balances are eliminated, unless a different treatment is appropriate for rate regulated transactions.

Xcel Energy uses the equity method of accounting for its investment in WYCO. Xcel Energy’s equity earnings in WYCO are included on the consolidated statements of income as equity earnings of unconsolidated subsidiaries.

Xcel Energy has investments in certain plants and transmission facilities jointly owned with nonaffiliated utilities. Xcel Energy’s proportionate share of jointly owned facilities is recorded as property, plant and equipment on the consolidated balance sheets, and Xcel Energy’s proportionate share of the operating costs associated with these facilities is included in its consolidated statements of income. See Note 3 for further information.

Xcel Energy’s consolidated financial statements are presented in accordance with GAAP. All of the utility subsidiaries’ underlying accounting records also conform to the FERC uniform system of accounts.

Xcel Energy has evaluated events occurring after Dec. 31, 2018 up to the date of issuance of these consolidated financial statements. Statements contain all necessary adjustments and disclosures resulting from that evaluation.

Use of Estimates — Xcel Energy uses estimates based on the best information available in recording transactions and balances resulting from business operations. Estimates are used on items such as plant depreciable lives or potential disallowances, AROs, certain regulatory assets and liabilities, tax provisions, uncollectible amounts, environmental costs, unbilled revenues, jurisdictional fuel and energy cost allocations and actuarially determined benefit costs. Recorded estimates are revised when better information becomes available or actual amounts can be determined. Revisions can affect operating results.

Regulatory Accounting — Xcel Energy Inc.’s regulated utility subsidiaries account for income and expense items in accordance with accounting guidance for regulated operations. Under this guidance:

• Certain costs, which would otherwise be charged to expense or other comprehensive income, are deferred as regulatory assets based on the expected ability to recover the costs in future rates.

• Certain credits, which would otherwise be reflected as income or other comprehensive income, are deferred as regulatory liabilities based on the expectation the amounts will be returned to customers in future rates, or because the amounts were collected in rates prior to the costs being incurred.

Estimates of recovering deferred costs and returning deferred credits are based on specific ratemaking decisions or precedent for each item. Regulatory assets and liabilities are amortized consistent with the treatment in the rate setting process.

If changes in the regulatory environment occur, the utility subsidiaries may no longer be eligible to apply this accounting treatment, and may be required to eliminate regulatory assets and liabilities from their balance sheets. Such changes could have a material effect on Xcel Energy’s results of operations, financial condition or cash flows.

See Note 4 for further information.

Income Taxes — Xcel Energy accounts for income taxes using the asset and liability method, which requires deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Xcel Energy defers income taxes for all temporary differences between pretax financial and taxable income, and between the book and tax bases of assets and liabilities. Xcel Energy uses the tax rates that are scheduled to be in effect when the temporary differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in the period that includes the enactment date.

The effects of tax rate changes that are attributable to the utility subsidiaries are generally subject to a normalization method of accounting. Therefore, the revaluation of most of the utility subsidiaries’ net deferred taxes upon a tax rate reduction results in the establishment of a net regulatory liability which will be refundable to utility customers over the remaining life of the related assets. A tax rate increase would result in the establishment of a similar regulatory asset.

Reversal of certain temporary differences are accounted for as current income tax expense due to the effects of past regulatory practices when deferred taxes were not required to be recorded due to the use of flow through accounting for ratemaking purposes. Tax credits are recorded when earned unless there is a requirement to defer the benefit and amortize it over the book depreciable lives of the related property. The requirement to defer and amortize tax credits only applies to federal ITCs related to public utility property. Utility rate regulation also has resulted in the recognition of regulatory assets and liabilities related to income taxes.

Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax asset will not be realized.

Xcel Energy follows the applicable accounting guidance to measure and disclose uncertain tax positions that it has taken or expects to take in its income tax returns. Xcel Energy recognizes a tax position in its consolidated financial statements when it is more likely than not that the position will be sustained upon examination based on the technical merits of the position.

Recognition of changes in uncertain tax positions are reflected as a component of income tax.

Xcel Energy reports interest and penalties related to income taxes within the other income and interest charges in the consolidated statements of income.

Xcel Energy Inc. and its subsidiaries file consolidated federal income tax returns as well as consolidated or separate state income tax returns. Federal income taxes paid by Xcel Energy Inc. are allocated to its subsidiaries based on separate company computations. A similar allocation is made for state income taxes paid by Xcel Energy Inc. in connection with consolidated state filings. Xcel Energy Inc. also allocates its own income tax benefits to its direct subsidiaries.

See Note 7 for further information.

Property, Plant and Equipment and Depreciation — Property, plant and equipment is stated at original cost. The cost of plant includes direct labor and materials, contracted work, overhead costs and AFUDC. The cost of plant retired is charged to accumulated depreciation and amortization. Amounts recovered in rates for future removal costs are recorded as regulatory liabilities. Significant additions or improvements extending asset lives are capitalized, while repairs and maintenance costs are charged to expense as incurred. Maintenance and replacement of items determined to be less than a unit of property are charged to operating expenses as incurred. Planned maintenance activities are charged to operating expense unless the cost represents the acquisition of an additional unit of property or the replacement of an existing unit of property.

Property, plant and equipment is tested for impairment when it is determined that the carrying value of the assets may not be recoverable. A loss is recognized in the current period if it becomes probable that part of a cost of a plant under construction or recently completed plant will be disallowed for recovery from customers and a reasonable estimate of the disallowance can be made. For investments in property, plant and equipment that are abandoned and not expected to go into service, incurred costs and related deferred tax amounts are compared to the discounted estimated future rate recovery, and a loss is recognized, if necessary.

Xcel Energy records depreciation expense using the straight-line method over the plant’s useful life. Actuarial life studies are performed and submitted to the state and federal commissions for review. Upon acceptance by the various commissions, the resulting lives and net salvage rates are used to calculate depreciation. Depreciation expense, expressed as a percentage of average depreciable property, was approximately 3.1% for 2018, 3.1% for 2017 and 2.9% for 2016.

See Note 3 for further information.

AROs—Xcel Energy Inc.’s utility subsidiaries account for AROs under accounting guidance that requires a liability for the fair value of an ARO to be recognized in the period in which it is incurred if it can be reasonably estimated, with the offsetting associated asset retirement costs capitalized as a long-lived asset. The liability is generally increased over time by applying the effective interest method of accretion, and the capitalized costs are depreciated over the useful life of the long-lived asset. Changes resulting from revisions to the timing or amount of expected asset retirement cash flows are recognized as an increase or a decrease in the ARO. Xcel Energy Inc.’s utility subsidiaries also recover through rates certain future plant removal costs in addition to AROs. The accumulated removal costs for these obligations are reflected in the balance sheets as a regulatory liability.

See Note 12 for further information.

Nuclear Decommissioning — Nuclear decommissioning studies that estimate NSP-Minnesota’s ultimate costs of decommissioning its nuclear power plants are performed at least every three years and submitted to the state commissions for approval.

For ratemaking purposes, NSP-Minnesota recovers the decommissioning costs of its nuclear power plants over each facility’s expected service life based on the triennial decommissioning studies. The studies consider estimated future costs of decommissioning and the market value of investments in trust funds, and recommend annual funding amounts. Amounts collected in rates are deposited in the trust funds. For financial reporting purposes, NSP-Minnesota accounts for nuclear decommissioning as an ARO.

Restricted funds for the payment of future decommissioning expenditures for NSP-Minnesota’s nuclear facilities are included in nuclear decommissioning fund and other assets on the consolidated balance sheets.

See Note 10 for further information.

Benefit Plans and Other Postretirement Benefits — Xcel Energy maintains pension and postretirement benefit plans for eligible employees. Recognizing the cost of providing benefits and measuring the projected benefit obligation of these plans requires management to make various assumptions and estimates.

Certain unrecognized actuarial gains and losses and unrecognized prior service costs or credits are deferred as regulatory assets and liabilities, rather than recorded as other comprehensive income, based on regulatory recovery mechanisms.

See Note 11 for further information.

Environmental Costs — Environmental costs are recorded when it is probable Xcel Energy is liable for remediation costs and the liability can be reasonably estimated. Costs are deferred as a regulatory asset if it is probable that the costs will be recovered from customers in future rates. Otherwise, the costs are expensed. If an environmental expense is related to facilities currently in use, such as emission-control equipment, the cost is capitalized and depreciated over the life of the plant.

Estimated remediation costs are regularly adjusted as estimates are revised and remediation proceeds. If other participating PRPs exist and acknowledge their potential involvement with a site, costs are estimated and recorded only for Xcel Energy’s expected share of the cost.

Future costs of restoring sites are treated as a capitalized cost of plant retirement. The depreciation expense levels recoverable in rates include a provision for removal expenses. Removal costs recovered in rates before the related costs are incurred are classified as a regulatory liability.

See Note 12 for further information.

Revenue From Contracts With Customers — Performance obligations related to the sale of energy are satisfied as energy is delivered to customers. Xcel Energy recognizes revenue that corresponds to the price of the energy delivered to the customer. The measurement of energy sales to customers is generally based on the reading of their meters, which occurs on a systematic basis throughout the month. At the end of each month, amounts of energy delivered to customers since the date of the last meter reading are estimated, and the corresponding unbilled revenue is recognized.

Xcel Energy does not recognize a separate financing component of its collections from customers as contract terms are short-term in nature. Xcel Energy presents its revenues net of any excise or sales taxes or fees.

Xcel Energy’s utility subsidiaries recognize sales to customers on a gross basis in electric revenues and cost of sales. Revenues and charges for short term wholesale sales of excess energy transacted through RTOs are also recorded on a gross basis. Other RTO revenues and charges are recorded on a net basis in cost of sales.

See Note 6 for further information.

Cash and Cash Equivalents — Xcel Energy considers investments in instruments with a remaining maturity of three months or less at the time of purchase, to be cash equivalents.

Accounts Receivable and Allowance for Bad Debts — Accounts receivable are stated at the actual billed amount net of an allowance for bad debts. Xcel Energy establishes an allowance for uncollectible receivables based on a policy that reflects its expected exposure to the credit risk of customers. As of Dec. 31, 2018 and 2017, the allowance for bad debts was $55 million and $52 million, respectively.

Inventory — Inventory is recorded at average cost and consisted of the following:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Inventories
Materials and supplies	$	271	$	311
Fuel	170		186
Natural gas	107		113
	$	548	$	610

Fair Value Measurements — Xcel Energy presents cash equivalents, interest rate derivatives, commodity derivatives and nuclear decommissioning fund assets at estimated fair values in its consolidated financial statements. Cash equivalents are recorded at cost plus accrued interest; money market funds are measured using quoted NAVs. For interest rate derivatives, quoted prices based primarily on observable market interest rate curves are used to establish fair value. For commodity derivatives, the most observable inputs available are generally used to determine the fair value of each contract. In the absence of a quoted price, Xcel Energy may use quoted prices for similar contracts or internally prepared valuation models to determine fair value.

For the pension and postretirement plan assets and nuclear decommissioning fund, published trading data and pricing models, generally using the most observable inputs available, are utilized to estimate fair value for each security.

See Notes 10 and 11 for further information.

Derivative Instruments — Xcel Energy uses derivative instruments in connection with its interest rate, utility commodity price, vehicle fuel price and commodity trading activities, including forward contracts, futures, swaps and options. Any derivative instruments not qualifying for the normal purchases and normal sales exception are recorded on the consolidated balance sheets at fair value as derivative instruments. Classification of changes in fair value for those derivative instruments is dependent on the designation of a qualifying hedging relationship. Changes in fair value of derivative instruments not designated in a qualifying hedging relationship are reflected in current earnings or as a regulatory asset or liability. Classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms.

Gains or losses on commodity trading transactions are recorded as a component of electric operating revenues; hedging transactions for vehicle fuel costs are recorded as a component of capital projects and O&M costs; and interest rate hedging transactions are recorded as a component of interest expense.

Normal Purchases and Normal Sales — Xcel Energy enters into contracts for purchases and sales of commodities for use in its operations. At inception, contracts are evaluated to determine whether a derivative exists and/or whether an instrument may be exempted from derivative accounting if designated as a normal purchase or normal sale.

See Note 10 for further information.

Commodity Trading Operations — All applicable gains and losses related to commodity trading activities are shown on a net basis in electric operating revenues in the consolidated statements of income.

Commodity trading activities are not associated with energy produced from Xcel Energy’s generation assets or energy and capacity purchased to serve native load. Commodity trading contracts are recorded at fair market value and commodity trading results include the impact of all margin-sharing mechanisms.

See Note 10 for further information.

Other Utility Items

AFUDC — AFUDC represents the cost of capital used to finance utility construction activity. AFUDC is computed by applying a composite financing rate to qualified CWIP. The amount of AFUDC capitalized as a utility construction cost is credited to other nonoperating income (for equity capital) and interest charges (for debt capital). AFUDC amounts capitalized are included in Xcel Energy’s rate base for establishing utility rates.

Alternative Revenue — Certain rate rider mechanisms (including decoupling and CIP/DSM programs) qualify as alternative revenue programs under GAAP. These mechanisms arise from costs imposed upon the utility by action of a regulator or legislative body related to an environmental, public safety or other mandate. When certain criteria are met, such as collection within 24 months, revenue is recognized equal to the revenue requirement, which may include incentives and return on rate base items. Billing amounts are revised periodically for differences between total amount collected and revenue earned, which may increase or decrease the level of revenue collected from customers. Alternative revenues arising from these programs are presented on a gross basis and disclosed separately from revenue from contracts with customers.

See Note 6 for further information.

Conservation Programs —Costs incurred for DSM and CIP programs are deferred if it is probable future revenue will recover the incurred cost. Revenues recognized for incentive programs for the recovery of lost margins and/or conservation performance incentives are limited to amounts expected to be collected within 24 months from when they are earned. Regulatory assets are recognized to reflect the amount of costs or earned incentives that have not yet been collected from customers.

Emission Allowances — Emission allowances are recorded at cost plus broker commission fees. The inventory accounting model is utilized for all emission allowances and sales of these allowances are included in electric revenues.

Nuclear Refueling Outage Costs — Xcel Energy uses a deferral and amortization method for nuclear refueling costs. This method amortizes refueling outage costs over the period between refueling outages consistent with rate recovery.

RECs — Cost of RECs that are utilized for compliance is recorded as electric fuel and purchased power expense. In certain jurisdictions, Xcel Energy reduces recoverable fuel costs for the cost of RECs and records that cost as a regulatory asset when the amount is recoverable in future rates.

Sales of RECs are recorded in electric revenues on a gross basis. The cost of these RECs and amounts credited to customers under margin-sharing mechanisms are recorded in electric fuel and purchased power expense.

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Accounting Pronouncements

12 Months Ended

Dec. 31, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Accounting Pronouncements

Accounting Pronouncements

Recently Issued

Leases —In 2016, the FASB issued Leases, Topic 842 (ASU No. 2016-02), which requires balance sheet recognition of right-of-useassets and lease liabilities for most leases. Adoptionwill occur on Jan. 1, 2019 utilizing the package of transition practical expedients provided by the new standard, including carrying forward prior conclusions of whether agreements existing before the adoption date contain leases, and whether existing leases are operating or capital/finance leases. Xcel Energy expects to utilize other expedients offered by the new standard and Leases, Topic 842 (ASU No. 2018-11), including elections to not recognize short term leases on the consolidated balance sheet for certain classes of assets and to implement the standard on a prospective basis. Xcel Energy’s implementation of the new guidance is substantially complete, and is expected to result in the recognition of approximately $2 billion of right-of-use assets and lease liabilities in the first quarter of 2019 for operating leases for the use of real estate, equipment and certain natural gas generating facilities operated under PPAs. The implementation is not expected to have a significant impact on Xcel Energy’s consolidated financial statements, other than first-time recognition of these operating leases on the consolidated balance sheet.

Recently Adopted

Revenue Recognition —In 2014, the FASB issued Revenue from Contracts with Customers, Topic 606 (ASU No. 2014-09), which provides a new framework for the recognition of revenue. Xcel Energy implemented the guidance on a modified retrospective basis on Jan. 1, 2018. Results for reporting periods beginning after Dec. 31, 2017 are presented in accordance with Topic 606, while prior period results have not been adjusted and continue to be reported in accordance with prior accounting guidance. The implementation did not have a material impact on Xcel Energy’s consolidated financial statements, other than increased disclosures regarding revenues related to contracts with customers.

Classification and Measurement of Financial Instruments —In 2016, the FASB issued Recognition and Measurement of Financial Assets and Financial Liabilities, Subtopic 825-10 (ASU No. 2016-01), which eliminated the available-for-sale classification for marketable equity securities and also replaced the cost method of accounting for non-marketable equity securities with a model for recognizing impairments and observable price changes. Xcel Energy implemented the guidance on Jan. 1, 2018 and the adoption impacts were not material.

Presentation of Net Periodic Benefit Cost —In 2017, the FASB issued Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, Topic 715 (ASU No. 2017-07), which establishes that only the service cost portion of pension cost may be presented as a component of operating income. In addition, only the service cost portion of pension cost is eligible for capitalization. As a result of regulatory accounting treatment, a similar amount of pension cost, including non-service components, will be recognized consistent with historical ratemaking and the impacts of adoption are limited to changes in classification of non-service costs in the consolidated statements of income.

Xcel Energy implemented the new guidance on Jan. 1, 2018. As a result, $33 million and $26 million of pension costs were retrospectively reclassified from operating and maintenance expenses to other expense, net on the consolidated statements of income for 2017 and 2016, respectively. Xcel Energy used benefit cost amounts disclosed for prior periods as the basis for retrospective application.

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Property Plant and Equipment Property Plant and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure

Property, Plant and Equipment

Major classes of property, plant and equipment:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
Property, plant and equipment
Electric plant	$	41,472		$	39,016
Natural gas plant	6,210			5,800
Common and other property	2,154			2,013
Plant to be retired (a)	322			11
CWIP	2,091			2,087
Total property, plant and equipment	52,249			48,927
Less accumulated depreciation	(15,659		)	(15,000		)
Nuclear fuel	2,771			2,697
Less accumulated amortization	(2,417		)	(2,295		)
	$	36,944		$	34,329

^(a)  In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early in 2025.  Amounts are presented net of accumulated depreciation.

Joint Ownership of Generation, Transmission and Gas Facilities

The utility subsidiaries’ jointly owned assets as of Dec. 31, 2018:

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Minnesota
Electric Generation:
Sherco Unit 3	$	604	$	415	$	1	59	%
Sherco Common Facilities	145		100		1		80
Other	5		4		—		59
Electric Transmission:
CapX2020 Transmission	960		73		2		51
Other	11		2		—		50
Total NSP-Minnesota	$	1,725	$	594	$	4

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Wisconsin
Electric Transmission:
La Crosse, WI to Madison, WI	$	175	$	2	$	—	37	%
CapX2020 Transmission	169		15		2		81
Total NSP-Wisconsin	$	344	$	17	$	2

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
PSCo
Electric Generation:
Hayden Unit 1	$	153	$	76	$	—	76	%
Hayden Unit 2	149		68		—		37
Hayden Common Facilities	41		21		—		53
Craig Units 1 and 2	81		40		—		10
Craig Common Facilities	39		21		—		7
Comanche Unit 3	886		130		—		67
Comanche Common Facilities	28		3		—		82
Electric Transmission:
Transmission and other facilities	183		63		1		Various
Gas Transportation:
Rifle, CO to Avon, CO	22		7		—		60
Gas Transportation Compressor	8		1		—		50
Total PSCo	$	1,590	$	430	$	1

Each company’s share of operating expenses and construction expenditures are included in the applicable utility accounts. Respective owners are responsible for providing their own financing.

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Regulatory Assets and Liabilities

12 Months Ended

Dec. 31, 2018

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets and Liabilities

Regulatory Assets and Liabilities

Regulatory assets and liabilities are created for amounts that regulators may allow to be collected, or may require to be paid back to customers in future electric and natural gas rates. Xcel Energy would be required to recognize the write-off of regulatory assets and liabilities in net income or other comprehensive income if changes in the utility industry no longer allow for the application of regulatory accounting guidance under GAAP.

Components of regulatory assets:

(Millions of Dollars)	See Note(s)	Remaining Amortization Period	Dec. 31, 2018				Dec. 31, 2017
Regulatory Assets			Current		Non- current		Current		Non- current
Pension and retiree medical obligations	11	Various	$	87	$	1,500	$	91	$	1,499
Net AROs (a)	1, 12	Plant lives	—		452		—		301
Excess deferred taxes - TCJA	7	Various	—		296		—		254
Recoverable deferred taxes on AFUDC recorded in plant		Plant lives	—		264		—		244
Environmental remediation costs	1, 12	Various	17		155		16		165
Depreciation differences		One to thirteen years	18		107		20		69
Benson biomass PPA termination and asset purchase		Ten years	10		86		—		—
Contract valuation adjustments (b)	1, 10	Term of related contract	17		77		21		93
Laurentian biomass PPA termination		Five years	18		73		—		—
Purchased power contract costs		Term of related contract	4		63		3		67
PI EPU		Sixteen years	3		56		3		58
Losses on reacquired debt		Term of related debt	4		44		5		48
State commission adjustments		Plant lives	1		29		1		29
Conservation programs (c)	1	One to two years	42		28		50		32
Property tax		Various	14		10		8		24
Nuclear refueling outage costs	1	One to two years	37		14		49		20
Deferred purchased natural gas and electric energy costs		One to three years	57		13		21		13
Renewable resources and environmental initiatives		One to two years	39		9		48		10
Sales true up and revenue decoupling		One to two years	38		7		37		12
Gas pipeline inspection and remediation costs		One to two years	28		3		24		12
Other		Various	30		40		27		55
Total regulatory assets			$	464	$	3,326	$	424	$	3,005

^(a) Includes amounts recorded for future recovery of AROs, less amounts recovered through nuclear decommissioning accruals and gains from decommissioning investments.

^(b) Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

^(c) Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

Components of regulatory liabilities:

(Millions of Dollars)	See Note(s)	Remaining Amortization Period	Dec. 31, 2018				Dec. 31, 2017
Regulatory Liabilities			Current		Non- current		Current		Non- current
Deferred income tax adjustments and TCJA refunds (a)	7	Various	$	157	$	3,715	$	—	$	3,790
Plant removal costs	1, 12	Plant lives	—		1,175		—		1,131
Effects of regulation on employee benefit costs (b)		Various	—		137		—		46
Renewable resources and environmental initiatives		Various	9		54		19		60
ITC deferrals (c)	1	Various	—		40		—		23
Deferred electric, natural gas and steam production costs		Less than one year	102		—		104		—
Contract valuation adjustments (d)	1, 10	Less than one year	26		—		30		—
Conservation programs (e)	1	Less than one year	36		—		23		—
DOE settlement		Less than one year	19		—		18		—
Other		Various	87		66		45		33
Total regulatory liabilities (f)			$	436	$	5,187	$	239	$	5,083

^(a)  Includes the revaluation of recoverable/regulated plant ADIT and revaluation impact of non-plant ADIT due to the TCJA.

^(b)  Includes regulatory amortization and certain TCJA benefits approved by the CPUC to offset the PSCo prepaid pension asset at Dec. 31, 2018.

^(c)  Includes impact of lower federal tax rate due to the TCJA.

^(d)  Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

^(e)  Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

^(f)  Revenue subject to refund of $29 million and $15 million for 2018 and 2017, respectively, is included in other current liabilities.

At Dec. 31, 2018 and 2017, Xcel Energy’s regulatory assets not earning a return primarily included the unfunded portion of pension and retiree medical obligations, net AROs and Laurentian biomass PPA termination costs/obligations. In addition, regulatory assets included $178 million and $212 million at Dec. 31, 2018 and 2017, respectively, of past expenditures not earning a return. Amounts largely related to purchased natural gas and electric energy costs, various renewable resources and certain environmental initiatives.

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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Borrowings and Other Financing Instruments

Borrowings and Other Financing Instruments

Short-Term Borrowings

Short-Term Debt — Xcel Energy Inc. and its utility subsidiaries meet their short-term liquidity requirements primarily through the issuance of commercial paper, term loan borrowings and letters of credit under their credit facilities.

Short-term debt borrowings outstanding for Xcel Energy were as follows:

	Three Months Ended Dec. 31, 2018			Year Ended Dec. 31
(Amounts in Millions, Except Interest Rates)				2018			2017			2016
Borrowing limit	$	3,250		$	3,250		$	3,250		$	2,750
Amount outstanding at period end	1,038			1,038			814			392
Average amount outstanding	500			788			644			485
Maximum amount outstanding	1,038			1,349			1,247			1,183
Weighted average interest rate, computed on a daily basis	2.76		%	2.34		%	1.35		%	0.74		%
Weighted average interest rate at end of period	2.97			2.97			1.90			0.95

Term Loan Agreement —In December 2018, Xcel Energy Inc. renewed its $500 million364-Day Term Loan Agreement with $250 million outstanding. In February 2019, Xcel Energy borrowed the remaining amount. No additional capacity remains as loans borrowed and repaid may not be redrawn. The loan is unsecured and matures Dec. 3, 2019. Xcel Energy has an option to request an extension through Dec. 2, 2020. Term loan includes one financial covenant, requiring Xcel Energy’s consolidated funded debt to total capitalization ratio to be less than or equal to 65 percent. Interest is at a rate equal to either (i) the Eurodollar rate, plus 50.0 basis points, or (ii) an alternate base rate. Xcel Energy is also required to pay a commitment fee equal to 10 basis points per annum on the unborrowed portion.

Letters of Credit— Xcel Energy Inc. and its subsidiaries use letters of credit, typically with terms of one year, to provide financial guarantees for certain operating obligations. As of Dec. 31, 2018 and 2017, there were $49 million and $30 million of letters of credit outstanding. Amounts approximate their fair value.

Credit Facilities — Xcel Energy Inc. and its utility subsidiaries must have revolving credit facilities in place at least equal to the amount of their commercial paper borrowing limits and cannot issue commercial paper exceeding available capacity under these credit facilities. The lines of credit provide short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

Features of the credit facilities:

	Debt-to-Total Capitalization Ratio(a)				Amount Facility May Be Increased (millions)		Additional Periods For Which a One-Year Extension May Be Requested (b)
	2018		2017
Xcel Energy Inc. (c)	58	%	58	%	$	200	2
NSP-Wisconsin	48		47		N/A		1
NSP-Minnesota	48		48		100		2
SPS	46		46		50		2
PSCo	46		44		100		2

^(a)  Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.

^(b)  All extension requests are subject to majority bank group approval.

^(c) The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. will be in default on its borrowings under the facility if it or any of its subsidiaries (except NSP-Wisconsin as long as its total assets do not comprise more than 15% of Xcel Energy’s consolidated total assets) default on indebtedness in an aggregate principal amount exceeding $75 million.

If Xcel Energy Inc. or its utility subsidiaries do not comply with the covenant, an event of default may be declared, and if not remedied, any outstanding amounts due under the facility can be declared due by the lender. As of Dec. 31, 2018, Xcel Energy Inc. and its subsidiaries were in compliance with all financial covenants.

Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available as of Dec. 31, 2018:

(Millions of Dollars)	Credit Facility (a)		Drawn (b)		Available
Xcel Energy Inc.	$	1,500	$	488	$	1,012
PSCo	700		317		383
NSP-Minnesota	500		187		313
SPS	400		44		356
NSP-Wisconsin	150		51		99
Total	$	3,250	$	1,087	$	2,163

^(a)  These credit facilities mature in June 2021, with the exception of Xcel Energy’s Inc.’s 364-day term loan agreement which expires in December 2019.

^(b)  Includes outstanding commercial paper, term loan borrowings and letters of credit.

All credit facility bank borrowings, outstanding letters of credit, term loan borrowings and outstanding commercial paper reduce the available capacity under the credit facilities. Xcel Energy Inc. and its subsidiaries had no direct advances on facilities outstanding as of Dec. 31, 2018 and 2017.

Long-Term Borrowings and Other Financing Instruments

Generally, all property of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS are subject to the liens of their first mortgage indentures. Debt premiums, discounts and expenses are amortized over the life of the related debt. The premiums, discounts and expenses for refinanced debt are deferred and amortized over the life of the new issuance.

Long term debt obligations for Xcel Energy Inc. and its utility subsidiaries as of Dec. 31:

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
Xcel Energy Inc.
Unsecured senior notes	2020 - 2041	2.40% - 6.50%	1.20% - 6.50%	$	3,400		$	2,900
Elimination of PSCo capital lease obligation with affiliates				(60		)	(62		)
Unamortized discount				(5		)	(2		)
Unamortized debt issuance cost				(21		)	(20		)
Current maturities (Capital lease obligation)				2			2
Total				$	3,316		$	2,818

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
NSP-Minnesota
Mortgage bonds	2020 - 2047	2.15% - 7.13%	2.15% - 7.13%	$	5,000		$	5,000
Unamortized discount				(21		)	(22		)
Unamortized debt issuance cost				(42		)	(45		)
Current maturities				—			—
Total				$	4,937		$	4,933

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
NSP-Wisconsin
Mortgage bonds	2024 - 2048	3.3% - 6.38%	3.3% - 6.38%	$	800		$	750
City of La Crosse resource recovery bond	2021	6.00%	6.00%	19			19
Other				—			2
Unamortized discount				(3		)	(3		)
Unamortized debt issuance cost				(9		)	(7		)
Current maturities				—			(151		)
Total				$	807		$	610

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
PSCo
Capital lease obligations	2025 - 2060	11.20% - 14.30%	11.20% - 14.30%	$	145		$	151
Mortgage bonds	2019 - 2048	2.25% - 6.50%	2.25% - 6.50%	4,900			4,500
Unamortized discount				(14		)	(13		)
Unamortized debt issuance cost				(33		)	(29		)
Current maturities				(406		)	(306		)
Total				$	4,592		$	4,303

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
SPS
Mortgage bonds	2024 - 2048	3.30% - 4.50%	3.30% - 4.50%	$	1,800		$	1,500
Unsecured senior notes	2033 - 2036	6.00%	6.00% - 8.75%	350			350
Unamortized discount				(4		)	(2		)
Unamortized debt issuance cost				(20		)	(18		)
Current maturities				—			—
Total				$	2,126		$	1,830

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
Other Subsidiaries
Various Eloigne Co. affordable housing project notes	2019 - 2052	0.00% - 6.90%	0.00% - 7.05%	$	26		$	28
Current maturities				(1		)	(2		)
Total				$	25		$	26

Maturities of long-term debt:

(Millions of Dollars)
2019	$	406
2020	1,257
2021	425
2022	902
2023	653

2018 financings:

	Amount	Financing Instrument	Interest Rate		Maturity Date
Xcel Energy Inc.	$500 million	Senior Notes	4.00	%	June 15, 2028
PSCo	350 million	First mortgage bonds	3.70		June 15, 2028
PSCo	350 million	First mortgage bonds	4.10		June 15, 2048
NSP-Wisconsin	200 million	First mortgage bonds	4.20		Sept. 1, 2048
SPS	300 million	First mortgage bonds	4.40		Nov 15, 2048

2017 financings:

	Amount	Financing Instrument	Interest Rate		Maturity Date
PSCo	$400 million	First mortgage bonds	3.80	%	June 15, 2047
SPS	450 million	First mortgage bonds	3.70		Aug. 15, 2047
NSP-Minnesota	600 million	First mortgage bonds	3.60		Sept. 15, 2047
NSP-Wisconsin	100 million	First mortgage bonds	3.75		Dec. 1, 2047

Forward Equity Agreements —In November 2018, Xcel Energy Inc. entered into forward sale agreements in connection with a completed $459 million public offering of 9.4 million shares of Xcel Energy common stock. The initial forward agreement was for 8.1 million shares with an additional agreement of 1.2 million shares exercised at the option of the banking counterparty. At Dec. 31, 2018, the forward agreements could have been settled with physical delivery of 9.4 million common shares to the banking counterparty in exchange for cash of $456 million. The forward instruments could also have been settled at Dec. 31, 2018 with delivery of approximately $24 million of cash or approximately 0.5 million shares of common stock to the counterparty, if Xcel Energy unilaterally elected net cash or net share settlement, respectively. The forward price used to determine amounts due at settlement is calculated based on the November 2018 public offering price for Xcel Energy’s common stock of $49.00, increased for the overnight bank funding rate, less a spread of 0.75% and less expected dividends on Xcel Energy’s common stock during the period the instruments are outstanding.

Xcel Energy may settle the agreements at any time up to the maturity date of February 7, 2020. Depending on settlement timing, cash proceeds are expected to be approximately $450 million to $460 million.

Forward equity instruments were recognized within stockholders’ equity at fair value at execution of the agreements, and will not be subsequently adjusted until settlement.

ATM Equity Offering— Xcel Energy issued 4.7 million shares of common stock with net proceeds of $224.7 million through the at-the-market program. In addition, transaction fees of $1.9 million were paid. In November 2018, the ATM offering was closed.

Other Equity —Xcel Energy issued $38.5 million and $39.2 million of equity through the DRIP program during the years ended Dec. 31, 2018 and 2017 respectively. Program allows stockholders to elect dividend reinvestment in Xcel Energy common stock through a non-cash transaction. See Note 8 for equity items related to share based compensation.

Deferred Financing Costs — Deferred financing costs of approximately $126 million and $119 million, net of amortization, are presented as a deduction from the carrying amount of long-term debt as of Dec. 31, 2018 and 2017, respectively.

Capital Stock — Preferred stock authorized/outstanding:

	Preferred Stock Authorized (Shares)	Par Value of Preferred Stock		Preferred Stock Outstanding (Shares) 2018 and 2017
Xcel Energy Inc.	7,000,000	$	100	—
PSCo	10,000,000	0.01		—
SPS	10,000,000	1.00		—

Xcel Energy Inc. had the following common stock authorized/outstanding:

Commons Stock Authorized (Shares)		Par Value of Common Stock		Common Stock Outstanding (Shares)2018	Common Stock Outstanding (Shares) 2017
1	billion	$	2.50	514,036,787	507,762,881

Dividend and Other Capital-Related Restrictions — Xcel Energy depends on its subsidiaries to pay dividends. Xcel Energy Inc.’s utility subsidiaries’ dividends are subject to the FERC’s jurisdiction, which prohibits the payment of dividends out of capital accounts. Dividends are solely to be paid from retained earnings. Certain covenants also require Xcel Energy Inc. to be current on interest payments prior to dividend disbursements.

State regulatory commissions impose dividend limitations for NSP-Minnesota, NSP-Wisconsin and SPS.

Requirements and actuals as of Dec. 31, 2018:

	Equity to Total Capitalization Ratio Required Range				Equity to Total Capitalization Ratio Actual
	Low		High		2018
NSP-Minnesota	47.1	%	57.5	%	52.3	%
NSP-Wisconsin	51.5		N/A		51.8
SPS (a)	45.0		55.0		54.4

^(a)  SPS excludes short-term debt.

	Unrestricted Retained Earnings			Total Capitalization			Limit on Total Capitalization
NSP-Minnesota	$	1.0	billion	$	10.7	billion	$	11.5	billion
NSP-Wisconsin (a)	11.5		million	1.7		billion	N/A
SPS (b)	605.7		million	4.7		billion	N/A

^(a)  NSP-Wisconsin cannot pay annual dividends in excess of approximately $55 million if its average equity-to-total capitalization ratio falls below the commission authorized level.

^(b)  SPS may not pay a dividend that would cause it to lose its investment grade bond rating.

Issuance of securities by Xcel Energy Inc. generally is not subject to regulatory approval. However, utility financings and intra-system financings are subject to the jurisdiction of state regulatory commissions and/or the FERC. Xcel Energy may seek additional authorization as necessary.

Authorizations as of Dec. 31, 2018:

	Amount Authorized to Issue
	Long-Term Debt				Short-Term Debt
NSP-Minnesota	52.93% of total capitalization			(a)	$	1.725	billion	(a)
NSP-Wisconsin	$	—		(b)	150		million
SPS	—			(b)	600		million
PSCo	1.1		billion		800		million

^(a)  NSP-Minnesota has authorization to issue long-term securities provided the equity-to-total capitalization remains within the required range, and to issue short-term debt provided it does not exceed 15% of total capitalization.

^(b)  SPS and NSP-Wisconsin will file for additional long-term debt authorization.

Borrowings and Other Financing Instruments

Short-Term Borrowings

Short-Term Debt — Xcel Energy Inc. and its utility subsidiaries meet their short-term liquidity requirements primarily through the issuance of commercial paper, term loan borrowings and letters of credit under their credit facilities.

Short-term debt borrowings outstanding for Xcel Energy were as follows:

	Three Months Ended Dec. 31, 2018			Year Ended Dec. 31
(Amounts in Millions, Except Interest Rates)				2018			2017			2016
Borrowing limit	$	3,250		$	3,250		$	3,250		$	2,750
Amount outstanding at period end	1,038			1,038			814			392
Average amount outstanding	500			788			644			485
Maximum amount outstanding	1,038			1,349			1,247			1,183
Weighted average interest rate, computed on a daily basis	2.76		%	2.34		%	1.35		%	0.74		%
Weighted average interest rate at end of period	2.97			2.97			1.90			0.95

Term Loan Agreement —In December 2018, Xcel Energy Inc. renewed its $500 million364-Day Term Loan Agreement with $250 million outstanding. In February 2019, Xcel Energy borrowed the remaining amount. No additional capacity remains as loans borrowed and repaid may not be redrawn. The loan is unsecured and matures Dec. 3, 2019. Xcel Energy has an option to request an extension through Dec. 2, 2020. Term loan includes one financial covenant, requiring Xcel Energy’s consolidated funded debt to total capitalization ratio to be less than or equal to 65 percent. Interest is at a rate equal to either (i) the Eurodollar rate, plus 50.0 basis points, or (ii) an alternate base rate. Xcel Energy is also required to pay a commitment fee equal to 10 basis points per annum on the unborrowed portion.

Letters of Credit— Xcel Energy Inc. and its subsidiaries use letters of credit, typically with terms of one year, to provide financial guarantees for certain operating obligations. As of Dec. 31, 2018 and 2017, there were $49 million and $30 million of letters of credit outstanding. Amounts approximate their fair value.

Credit Facilities — Xcel Energy Inc. and its utility subsidiaries must have revolving credit facilities in place at least equal to the amount of their commercial paper borrowing limits and cannot issue commercial paper exceeding available capacity under these credit facilities. The lines of credit provide short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

Features of the credit facilities:

	Debt-to-Total Capitalization Ratio(a)				Amount Facility May Be Increased (millions)		Additional Periods For Which a One-Year Extension May Be Requested (b)
	2018		2017
Xcel Energy Inc. (c)	58	%	58	%	$	200	2
NSP-Wisconsin	48		47		N/A		1
NSP-Minnesota	48		48		100		2
SPS	46		46		50		2
PSCo	46		44		100		2

^(a)  Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.

^(b)  All extension requests are subject to majority bank group approval.

^(c) The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. will be in default on its borrowings under the facility if it or any of its subsidiaries (except NSP-Wisconsin as long as its total assets do not comprise more than 15% of Xcel Energy’s consolidated total assets) default on indebtedness in an aggregate principal amount exceeding $75 million.

If Xcel Energy Inc. or its utility subsidiaries do not comply with the covenant, an event of default may be declared, and if not remedied, any outstanding amounts due under the facility can be declared due by the lender. As of Dec. 31, 2018, Xcel Energy Inc. and its subsidiaries were in compliance with all financial covenants.

Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available as of Dec. 31, 2018:

(Millions of Dollars)	Credit Facility (a)		Drawn (b)		Available
Xcel Energy Inc.	$	1,500	$	488	$	1,012
PSCo	700		317		383
NSP-Minnesota	500		187		313
SPS	400		44		356
NSP-Wisconsin	150		51		99
Total	$	3,250	$	1,087	$	2,163

^(a)  These credit facilities mature in June 2021, with the exception of Xcel Energy’s Inc.’s 364-day term loan agreement which expires in December 2019.

^(b)  Includes outstanding commercial paper, term loan borrowings and letters of credit.

All credit facility bank borrowings, outstanding letters of credit, term loan borrowings and outstanding commercial paper reduce the available capacity under the credit facilities. Xcel Energy Inc. and its subsidiaries had no direct advances on facilities outstanding as of Dec. 31, 2018 and 2017.

Long-Term Borrowings and Other Financing Instruments

Generally, all property of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS are subject to the liens of their first mortgage indentures. Debt premiums, discounts and expenses are amortized over the life of the related debt. The premiums, discounts and expenses for refinanced debt are deferred and amortized over the life of the new issuance.

Long term debt obligations for Xcel Energy Inc. and its utility subsidiaries as of Dec. 31:

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
Xcel Energy Inc.
Unsecured senior notes	2020 - 2041	2.40% - 6.50%	1.20% - 6.50%	$	3,400		$	2,900
Elimination of PSCo capital lease obligation with affiliates				(60		)	(62		)
Unamortized discount				(5		)	(2		)
Unamortized debt issuance cost				(21		)	(20		)
Current maturities (Capital lease obligation)				2			2
Total				$	3,316		$	2,818

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
NSP-Minnesota
Mortgage bonds	2020 - 2047	2.15% - 7.13%	2.15% - 7.13%	$	5,000		$	5,000
Unamortized discount				(21		)	(22		)
Unamortized debt issuance cost				(42		)	(45		)
Current maturities				—			—
Total				$	4,937		$	4,933

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
NSP-Wisconsin
Mortgage bonds	2024 - 2048	3.3% - 6.38%	3.3% - 6.38%	$	800		$	750
City of La Crosse resource recovery bond	2021	6.00%	6.00%	19			19
Other				—			2
Unamortized discount				(3		)	(3		)
Unamortized debt issuance cost				(9		)	(7		)
Current maturities				—			(151		)
Total				$	807		$	610

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
PSCo
Capital lease obligations	2025 - 2060	11.20% - 14.30%	11.20% - 14.30%	$	145		$	151
Mortgage bonds	2019 - 2048	2.25% - 6.50%	2.25% - 6.50%	4,900			4,500
Unamortized discount				(14		)	(13		)
Unamortized debt issuance cost				(33		)	(29		)
Current maturities				(406		)	(306		)
Total				$	4,592		$	4,303

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
SPS
Mortgage bonds	2024 - 2048	3.30% - 4.50%	3.30% - 4.50%	$	1,800		$	1,500
Unsecured senior notes	2033 - 2036	6.00%	6.00% - 8.75%	350			350
Unamortized discount				(4		)	(2		)
Unamortized debt issuance cost				(20		)	(18		)
Current maturities				—			—
Total				$	2,126		$	1,830

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
Other Subsidiaries
Various Eloigne Co. affordable housing project notes	2019 - 2052	0.00% - 6.90%	0.00% - 7.05%	$	26		$	28
Current maturities				(1		)	(2		)
Total				$	25		$	26

Maturities of long-term debt:

(Millions of Dollars)
2019	$	406
2020	1,257
2021	425
2022	902
2023	653

2018 financings:

	Amount	Financing Instrument	Interest Rate		Maturity Date
Xcel Energy Inc.	$500 million	Senior Notes	4.00	%	June 15, 2028
PSCo	350 million	First mortgage bonds	3.70		June 15, 2028
PSCo	350 million	First mortgage bonds	4.10		June 15, 2048
NSP-Wisconsin	200 million	First mortgage bonds	4.20		Sept. 1, 2048
SPS	300 million	First mortgage bonds	4.40		Nov 15, 2048

2017 financings:

	Amount	Financing Instrument	Interest Rate		Maturity Date
PSCo	$400 million	First mortgage bonds	3.80	%	June 15, 2047
SPS	450 million	First mortgage bonds	3.70		Aug. 15, 2047
NSP-Minnesota	600 million	First mortgage bonds	3.60		Sept. 15, 2047
NSP-Wisconsin	100 million	First mortgage bonds	3.75		Dec. 1, 2047

Forward Equity Agreements —In November 2018, Xcel Energy Inc. entered into forward sale agreements in connection with a completed $459 million public offering of 9.4 million shares of Xcel Energy common stock. The initial forward agreement was for 8.1 million shares with an additional agreement of 1.2 million shares exercised at the option of the banking counterparty. At Dec. 31, 2018, the forward agreements could have been settled with physical delivery of 9.4 million common shares to the banking counterparty in exchange for cash of $456 million. The forward instruments could also have been settled at Dec. 31, 2018 with delivery of approximately $24 million of cash or approximately 0.5 million shares of common stock to the counterparty, if Xcel Energy unilaterally elected net cash or net share settlement, respectively. The forward price used to determine amounts due at settlement is calculated based on the November 2018 public offering price for Xcel Energy’s common stock of $49.00, increased for the overnight bank funding rate, less a spread of 0.75% and less expected dividends on Xcel Energy’s common stock during the period the instruments are outstanding.

Xcel Energy may settle the agreements at any time up to the maturity date of February 7, 2020. Depending on settlement timing, cash proceeds are expected to be approximately $450 million to $460 million.

Forward equity instruments were recognized within stockholders’ equity at fair value at execution of the agreements, and will not be subsequently adjusted until settlement.

ATM Equity Offering— Xcel Energy issued 4.7 million shares of common stock with net proceeds of $224.7 million through the at-the-market program. In addition, transaction fees of $1.9 million were paid. In November 2018, the ATM offering was closed.

Other Equity —Xcel Energy issued $38.5 million and $39.2 million of equity through the DRIP program during the years ended Dec. 31, 2018 and 2017 respectively. Program allows stockholders to elect dividend reinvestment in Xcel Energy common stock through a non-cash transaction. See Note 8 for equity items related to share based compensation.

Deferred Financing Costs — Deferred financing costs of approximately $126 million and $119 million, net of amortization, are presented as a deduction from the carrying amount of long-term debt as of Dec. 31, 2018 and 2017, respectively.

Capital Stock — Preferred stock authorized/outstanding:

	Preferred Stock Authorized (Shares)	Par Value of Preferred Stock		Preferred Stock Outstanding (Shares) 2018 and 2017
Xcel Energy Inc.	7,000,000	$	100	—
PSCo	10,000,000	0.01		—
SPS	10,000,000	1.00		—

Xcel Energy Inc. had the following common stock authorized/outstanding:

Commons Stock Authorized (Shares)		Par Value of Common Stock		Common Stock Outstanding (Shares)2018	Common Stock Outstanding (Shares) 2017
1	billion	$	2.50	514,036,787	507,762,881

Dividend and Other Capital-Related Restrictions — Xcel Energy depends on its subsidiaries to pay dividends. Xcel Energy Inc.’s utility subsidiaries’ dividends are subject to the FERC’s jurisdiction, which prohibits the payment of dividends out of capital accounts. Dividends are solely to be paid from retained earnings. Certain covenants also require Xcel Energy Inc. to be current on interest payments prior to dividend disbursements.

State regulatory commissions impose dividend limitations for NSP-Minnesota, NSP-Wisconsin and SPS.

Requirements and actuals as of Dec. 31, 2018:

	Equity to Total Capitalization Ratio Required Range				Equity to Total Capitalization Ratio Actual
	Low		High		2018
NSP-Minnesota	47.1	%	57.5	%	52.3	%
NSP-Wisconsin	51.5		N/A		51.8
SPS (a)	45.0		55.0		54.4

^(a)  SPS excludes short-term debt.

	Unrestricted Retained Earnings			Total Capitalization			Limit on Total Capitalization
NSP-Minnesota	$	1.0	billion	$	10.7	billion	$	11.5	billion
NSP-Wisconsin (a)	11.5		million	1.7		billion	N/A
SPS (b)	605.7		million	4.7		billion	N/A

^(a)  NSP-Wisconsin cannot pay annual dividends in excess of approximately $55 million if its average equity-to-total capitalization ratio falls below the commission authorized level.

^(b)  SPS may not pay a dividend that would cause it to lose its investment grade bond rating.

Issuance of securities by Xcel Energy Inc. generally is not subject to regulatory approval. However, utility financings and intra-system financings are subject to the jurisdiction of state regulatory commissions and/or the FERC. Xcel Energy may seek additional authorization as necessary.

Authorizations as of Dec. 31, 2018:

	Amount Authorized to Issue
	Long-Term Debt				Short-Term Debt
NSP-Minnesota	52.93% of total capitalization			(a)	$	1.725	billion	(a)
NSP-Wisconsin	$	—		(b)	150		million
SPS	—			(b)	600		million
PSCo	1.1		billion		800		million

^(a)  NSP-Minnesota has authorization to issue long-term securities provided the equity-to-total capitalization remains within the required range, and to issue short-term debt provided it does not exceed 15% of total capitalization.

^(b)  SPS and NSP-Wisconsin will file for additional long-term debt authorization.

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Revenues

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenues

Revenues

Revenue is classified by the type of goods/services rendered and market/customer type. Xcel Energy’s operating revenues (subsequent to adoption of the revised revenue guidance) consists of the following:

	Year Ended Dec. 31, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	2,919	$	988	$	38	$	3,945
C&I	4,874		524		25		5,423
Other	134		—		6		140
Total retail	7,927		1,512		69		9,508
Wholesale	791		—		—		791
Transmission	523		—		—		523
Other	98		100		—		198
Total revenue from contracts with customers	9,339		1,612		69		11,020
Alternative revenue and other	380		127		10		517
Total revenues	$	9,719	$	1,739	$	79	$	11,537

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Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Federal Tax Reform— In 2017, the TCJA was signed into law. The key provisions impacting Xcel Energy, generally beginning in 2018, include:

• Corporate federal tax rate reduction from 35% to 21%;

• Normalization of resulting plant-related excess deferred taxes;

• Elimination of the corporate alternative minimum tax;

• Continued interest expense deductibility and discontinued bonus depreciation for regulated public utilities;

• Limitations on certain executive compensation deductions;

• Limitations on certain deductions for NOLs arising after Dec. 31, 2017 (limited to 80% of taxable income);

• Repeal of the section 199 manufacturing deduction; and

• Reduced deductions for meals and entertainment as well as state and local lobbying.

Xcel Energy estimated the effects of the TCJA, which have been reflected in the consolidated financial statements.

Reductions in deferred tax assets and liabilities due to a decrease in corporate federal tax rates typically result in a net tax benefit. However, the impacts are primarily recognized as regulatory liabilities refundable to utility customers as a result of IRS requirements and past regulatory treatment.

Estimated impacts of the new tax law in December 2017 included:

• $2.7 billion ($3.8 billion grossed-up for tax) of reclassifications of plant-related excess deferred taxes to regulatory liabilities upon valuation at the new 21% federal rate. The regulatory liabilities will be amortized consistent with IRS normalization requirements, resulting in customer refunds over an estimated weighted average period of approximately 30 years;

• $254 million and $174 million of reclassifications (grossed-up for tax) of excess deferred taxes for non-plant related deferred tax assets and liabilities, respectively, to regulatory assets and liabilities; and,

• $23 million of total estimated income tax expense related to the tax rate change on certain non-plant deferred taxes and all other 2017 income statement impacts of the federal tax reform.

Xcel Energy accounted for the state tax impacts of federal tax reform based on enacted state tax laws. Any future state tax law changes related to the TCJA will be accounted for in the periods state laws are enacted.

Federal Tax Loss Carryback Claims — In 2012 - 2015, Xcel Energy identified certain expenses related to 2009, 2010, 2011, 2013, 2014 and 2015 that qualify for an extended carryback beyond the typical two-year carryback period. As a result of a higher tax rate in prior years, Xcel Energy recognized a tax benefit of approximately $5 million in 2015, $17 million in 2014, $12 million in 2013 and $15 million in 2012.

Federal Audit— Statute of limitations applicable to Xcel Energy’s consolidated federal income tax returns expire as follows:

Tax Year(s)	Expiration
2009 - 2014	October 2019
2015	September 2019
2016	September 2020
2017	September 2021

In 2012, the IRS commenced an examination of tax years 2010 and 2011, including the 2009 carryback claim. In 2017, Xcel Energy and the Office of Appeals reached an agreement and the benefit related to the agreed upon portions was recognized. In the second quarter of 2018, the Joint Committee on Taxation completed its review and took no exception to the agreement. As a result, the remaining unrecognized tax benefit was released and recorded as a payable to the IRS.

In the third quarter of 2015, the IRS commenced an examination of tax years 2012 and 2013. In the third quarter of 2017, the IRS concluded the audit of tax years 2012 and 2013 and proposed an adjustment that would impact Xcel Energy’s NOL and ETR. Xcel Energy filed a protest with the IRS. As of Dec. 31, 2018, the case has been forwarded to the Office of Appeals and Xcel Energy has recognized its best estimate of income tax expense that will result from a final resolution of this issue; however, the outcome and timing of a resolution is unknown.

In the fourth quarter of 2018, the IRS began an audit of tax years 2014 - 2016, however no adjustments have been proposed.

State Audits— Xcel Energy files consolidated state tax returns based on income in its major operating jurisdictions and various other state income-based tax returns.

As of Dec. 31, 2018, Xcel Energy’s earliest open tax years (subject to examination by state taxing authorities in its major operating jurisdictions) were as follows:

State	Year
Colorado	2009
Minnesota	2009
Texas	2010
Wisconsin	2014

• In the fourth quarter of 2018, the Minnesota audit of tax years 2010 - 2014 concluded with no material adjustments.

• In the third quarter of 2018, the Wisconsin audit of tax years 2012 - 2013 concluded with no material adjustments. In the fourth quarter of 2018, Wisconsin began an audit of tax years 2014 - 2016. No material adjustments have been proposed.

• No other state income tax audits were in progress as of Dec. 31, 2018.

Unrecognized Tax Benefits — Unrecognized tax benefit balance includes permanent tax positions, which if recognized would affect the annual ETR. In addition, the unrecognized tax benefit balance includes temporary tax positions for which the ultimate deductibility is highly certain, but for which there is uncertainty about the timing of such deductibility. A change in the period of deductibility would not affect the ETR but would accelerate the payment to the taxing authority to an earlier period.

Unrecognized tax benefits - permanent vs. temporary:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Unrecognized tax benefit — Permanent tax positions	$	28	$	20
Unrecognized tax benefit — Temporary tax positions	9		19
Total unrecognized tax benefit	$	37	$	39

Changes in unrecognized tax benefits:

(Millions of Dollars)	2018			2017			2016
Balance at Jan. 1	$	39		$	134		$	121
Additions based on tax positions related to the current year	9			6			8
Reductions based on tax positions related to the current year	(4		)	(4		)	—
Additions for tax positions of prior years	2			15			10
Reductions for tax positions of prior years	(4		)	(105		)	(5		)
Settlements with taxing authorities	(5		)	(7		)	—
Balance at Dec. 31	$	37		$	39		$	134

Unrecognized tax benefits were reduced by tax benefits associated with NOL and tax credit carryforwards:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
NOL and tax credit carryforwards	$	(35	)	$	(31	)

Net deferred tax liability associated with the unrecognized tax benefit amounts and related NOLs and tax credits carryforwards were $24 million and $13 million at Dec. 31, 2018 and Dec 31, 2017, respectively.

As the IRS Appeals and federal and state audits progress and other state audits resume, it is reasonably possible that the amount of unrecognized tax benefit could decrease up to approximately $28 million in the next 12 months.

Payable for interest related to unrecognized tax benefits is partially offset by the interest benefit associated with NOL and tax credit carryforwards.

Interest payable related to unrecognized tax benefits:

(Millions of Dollars)	2018		2017			2016
Payable for interest related to unrecognized tax benefits at Jan. 1	$	—	$	(3	)	$	—
Interest income (expense) related to unrecognized tax benefits	—		3			(3		)
Payable for interest related to unrecognized tax benefits at Dec. 31	$	—	$	—		$	(3	)

No amounts were accrued for penalties related to unrecognized tax benefits as of Dec. 31, 2018, 2017 or 2016.

Other Income Tax Matters — NOL amounts represent the tax loss that is carried forward and tax credits represent the deferred tax asset. NOL and tax credit carryforwards as of Dec. 31 were as follows:

(Millions of Dollars)	2018			2017
Federal NOL carryforward	$	—		$	1,072
Federal tax credit carryforwards	553			517
Valuation allowances for federal credit carryforwards	(5		)	(5		)
State NOL carryforwards	1,104			1,592
Valuation allowances for state NOL carryforwards	(50		)	(55		)
State tax credit carryforwards, net of federal detriment (a)	89			90
Valuation allowances for state credit carryforwards, net of federal benefit (b)	(69		)	(68		)

^(a)  State tax credit carryforwards are net of federal detriment of $24 million as of Dec. 31, 2018 and 2017.

^(b)  Valuation allowances for state tax credit carryforwards were net of federal benefit of $18 million as of Dec. 31, 2018 and 2017.

Federal carryforward periods expire between 2021 and 2038 and state carryforward periods expire between 2019 and 2037.

Total income tax expense from operations differs from the amount computed by applying the statutory federal income tax rate to income before income tax expense.

Effective income tax rate for years ended Dec. 31:

	2018		2017 (a)		2016 (a)
Federal statutory rate	21.0	%	35.0	%	35.0	%
State income tax on pretax income, net of federal tax effect	5.0		4.1		4.1
Increases (decreases) in tax from:
Regulatory differences - ARAM (b)	(5.8	)	(0.1	)	(0.1	)
Wind production tax credits recognized	(5.2	)	(4.7	)	(3.4	)
Other tax credits recognized, net of federal income tax expense	(2.0	)	(1.0	)	(0.8	)
Regulatory differences - other utility plant items	(1.0	)	(0.7	)	(0.5	)
Regulatory differences - Deferral of ARAM (c)	0.6		—		—
Change in unrecognized tax benefits	0.4		(0.6	)	0.2
Tax reform	—		1.4		—
Other, net	(0.4	)	(1.3	)	(0.4	)
Effective income tax rate	12.6	%	32.1	%	34.1	%

^(a)  Prior periods have been reclassified to conform to current year presentation.

^(b)  ARAM is a method to flow back excess deferred taxes to customers.

^(c)  ARAM has been deferred when regulatory treatment has not been established. As Xcel Energy received direction from its regulatory commissions regarding the return of excess deferred taxes to customers, the ARAM deferral was reversed. This resulted in a reduction to tax expense with a corresponding reduction to revenue.

Components of income tax expense for years ended Dec. 31:

(Millions of Dollars)	2018			2017			2016
Current federal tax (benefit) expense	$	(34	)	$	1		$	(3	)
Current state tax expense (benefit)	8			(11		)	(4		)
Current change in unrecognized tax (benefit) expense	(6		)	(83		)	6
Deferred federal tax expense	122			460			477
Deferred state tax expense	85			107			112
Deferred change in unrecognized tax expense (benefit)	11			73			(2		)
Deferred investment tax credits	(5		)	(5		)	(5		)
Total income tax expense	$	181		$	542		$	581

Components of deferred income tax expense as of Dec. 31:

(Millions of Dollars)	2018			2017			2016
Deferred tax expense (benefit) excluding items below	$	320		$	(2,939	)	$	631
Amortization and adjustments to deferred income taxes on income tax regulatory assets and liabilities	(102		)	3,583			(45		)
Tax (expense) benefit allocated to other comprehensive income, net of adoption of ASU No. 2018-02, and other	—			(4		)	1
Deferred tax expense	$	218		$	640		$	587

Components of net deferred tax liability as of Dec. 31:

(Millions of Dollars)	2018			2017
Deferred tax liabilities:
Differences between book and tax bases of property	$	5,082		$	4,960
Regulatory assets	599			565
Pension expense	178			199
Other	64			57
Total deferred tax liabilities	$	5,923		$	5,781
Deferred tax assets:
Regulatory liabilities	$	879		$	886
Tax credit carryforward	642			607
NOL carryforward	51			293
NOL and tax credit valuation allowances	(79		)	(77		)
Other employee benefits	124			132
Deferred ITCs	16			17
Rate refund	60			10
Other	65			68
Total deferred tax assets	$	1,758		$	1,936
Net deferred tax liability	$	4,165		$	3,845

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Share-Based Compensation

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Share-Based Compensation

Incentive Plans Including Share-Based Compensation — Xcel Energy Inc. has three incentive plans that include share-based payment elements. Plans and authorized equity shares for awards:

• Omnibus Incentive Plan - 7.0 million shares;

• Long-Term Incentive Plan - 8.3 million shares; and,

• Executive Annual Incentive Award Plan - 1.2 million shares.

Restricted Stock — The Executive Annual Incentive Award Plan and Omnibus Incentive Plan allow certain employees to elect to receive shares of common or restricted stock. Restricted stock is treated as an equity award and vests and settles in equal annual installments over a three-year period. Restricted stock has a fair value equal to the market trading price of Xcel Energy Inc.’s stock at the grant date.

Shares of restricted stock granted at Dec. 31:

(Shares in Thousands)	2018		2017		2016
Granted shares	18		15		20
Grant date fair value	$	44.68	$	42.00	$	38.82

Changes in nonvested restricted stock:

(Shares in Thousands)	Shares		Weighted Average Grant Date Fair Value
Nonvested restricted stock at Jan. 1, 2018	44		$	39.71
Granted	18		44.68
Forfeited	—		—
Vested	(27	)	37.25
Dividend equivalents	1		46.27
Nonvested restricted stock at Dec. 31, 2018	36		44.29

Other Equity Awards — Xcel Energy Inc.’s Board of Directors has granted equity awards under the Xcel Energy Inc. Long-Term Incentive Plan and the Omnibus Incentive Plan. These plans include various vesting conditions and performance goals. At the end of the restricted period, such grants will be awarded if the vesting conditions and/or performance goals are met.

Certain employees are granted equity awards with a portion subject only to service conditions, and the other portion subject to performance conditions. A total of 0.3 million time-based equity shares subject only to service conditions were granted annually in 2018, 2017 and 2016, respectively.

The performance conditions for a portion of the awards granted from 2016 to 2018 are based on relative TSR and environmental goals. Equity awards with performance conditions will be settled or forfeited after three years, with payouts ranging from zero to 200 percent depending on achievement.

Equity award units granted to employees (excluding restricted stock):

(Units in Thousands)	2018		2017		2016
Granted units	500		503		522
Weighted average grant date fair value	$	47.60	$	41.02	$	36.00

Equity awards vested:

(Units in Thousands)	2018		2017		2016
Vested Units	475		467		530
Total Fair Value	$	23,393	$	22,459	$	21,575

Changes in the nonvested portion of equity award units for 2018:

(Units in Thousands)	Units		Weighted Average Grant Date Fair Value
Nonvested Units at Jan. 1, 2018	995		$	38.48
Granted	500		47.60
Forfeited	(126	)	41.74
Vested	(475	)	35.92
Dividend equivalents	45		40.74
Nonvested Units at Dec. 31, 2018	939		44.30

Stock Equivalent Units — Non-employee members of Xcel Energy Inc. Board of Directors may elect to receive their annual equity grant as stock equivalent units in lieu of common stock. Each unit’s value is equal to one share of Xcel Energy Inc. common stock. The annual equity grant is vested as of the date of each member’s election to the Board of Directors; there is no further service or other condition.  Directors may also elect to receive their cash fees as stock equivalent units in lieu of cash. Stock equivalent units are payable as a distribution of common stock upon a director’s termination of service.

Stock equivalent units granted:

(Units in Thousands)	2018		2017		2016
Granted units	36		51		49
Weighted average grant date fair value	$	45.44	$	46.05	$	40.68

Changes in stock equivalent units:

(Units in Thousands)	Units		Weighted Average Grant Date Fair Value
Stock equivalent units at Jan. 1, 2018	753		$	29.83
Granted	36		45.44
Units distributed	(123	)	31.21
Dividend equivalents	22		46.40
Stock equivalent units at Dec. 31, 2018	688		30.93

TSR Liability Awards — Xcel Energy Inc.’s Board of Directors has granted TSR liability awards under the Long-Term Incentive Plan and Omnibus Incentive Plan. The plans allow Xcel Energy to attach various performance goals to the awards granted. The liability awards have been historically dependent on relative TSR measured over a three-year period. Xcel Energy Inc.’s TSR is compared to a 22-member utilities peer group for 2016 - 2018 awards. Potential payouts of the awards range from zero to 200%.

TSR liability awards granted:

(In Thousands)	2018	2017	2016
Awards granted	239	240	264

TSR liability awards settled:

(In Thousands)	2018		2017		2016
Awards settled	482		454		354
Settlement amount (cash, common stock and deferred amounts)	$	21,534	$	19,083	$	13,724

TSR liability awards of $8 million were settled in cash in 2018.

Share-Based Compensation Expense — Vesting of employee equity awards is typically predicated on the achievement of a TSR or environmental measures target, other than for restricted stock. Additionally, approximately 0.3 million of equity award units were granted annually in 2016 - 2018, with vesting subject only to service conditions of three years. Generally these instruments are considered to be equity awards as the award settlement determination (shares or cash) is made by Xcel Energy, not the participants. In addition, these awards have not been previously settled in cash and Xcel Energy plans to continue electing share settlement. Grant date fair value of equity awards is expensed over the service period.

TSR liability awards have been historically settled partially in cash, and do not qualify as equity awards, but rather are accounted for as liabilities. As liability awards, the fair value on which ratable expense is based, as employees vest in their rights to those awards, is remeasured each period based on the current stock price and performance achievement, and final expense is based on the market value of the shares on the date the award is settled.

Compensation costs related to share-based awards:

(Millions of Dollars)	2018		2017		2016
Compensation cost for share-based awards (a)	$	45	$	57	$	41
Tax benefit recognized in income	12		22		16

^(a)  Compensation costs for share-based payment are included in O&M expense.

There was approximately $38 million in 2018 and $44 million in 2017 of total unrecognized compensation cost related to nonvested share-based compensation awards. Xcel Energy expects to recognize the unrecognized amount over a weighted average period of 1.6 years.

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Earnings Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Basic EPS was computed by dividing the earnings available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS was computed by dividing the earnings available to common shareholders by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock (i.e., common stock equivalents) were settled. The weighted average number of potentially dilutive shares outstanding used to calculate diluted EPS is calculated using the treasury stock method.

Common Stock Equivalents— Xcel Energy Inc. has common stock equivalents related to forward equity agreements and certain equity awards in share-based compensation arrangements. Common stock equivalents include commitments to issue common stock related to time based equity compensation awards.

Stock equivalent units granted to Xcel Energy Inc.’s Board of Directors are included in common shares outstanding upon grant date as there is no further service, performance or market condition associated with these awards. Restricted stock issued to employees under the Xcel Energy Inc. Executive Annual Incentive Award Plan is included in common shares outstanding when granted.

Share-based compensation arrangements for which there is currently no dilutive impact to EPS include the following:

• Equity awards subject to a performance condition; included in common shares outstanding when all necessary conditions for settlement have been satisfied by the end of the reporting period; and,

• Liability awards subject to a performance condition; any portions settled in shares are included in common shares outstanding upon settlement.

Diluted common shares outstanding included common stock equivalents of 0.5 million, 0.6 million and 0.7 million shares for 2018, 2017 and 2016.

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Fair Value of Financial Assets and Liabilities

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities

Fair Value of Financial Assets and Liabilities

Fair Value Measurements

Accounting guidance for fair value measurements and disclosures provides a single definition of fair value and requires disclosures about assets and liabilities measured at fair value. A hierarchical framework for disclosing the observability of the inputs utilized in measuring assets and liabilities at fair value is established by this guidance.

• Level 1 — Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices.

• Level 2 — Pricing inputs are other than quoted prices in active markets, but are either directly or indirectly observable as of the reporting date. The types of assets and liabilities included in Level 2 are typically either comparable to actively traded securities or contracts, or priced with models using highly observable inputs.

• Level 3 — Significant inputs to pricing have little or no observability as of the reporting date. The types of assets and liabilities included in Level 3 are those valued with models requiring significant management judgment or estimation.

Specific valuation methods include:

Cash equivalents— The fair values of cash equivalents are generally based on cost plus accrued interest; money market funds are measured using quoted NAV.

Investments in equity securities and other funds— Equity securities are valued using quoted prices in active markets. The fair values for commingled funds are measured using NAVs. The investments in commingled funds may be redeemed for NAV with proper notice. Private equity commingled fund investments require approval of the fund for any unscheduled redemption, and such redemptions may be approved or denied by the fund at its sole discretion. Unscheduled distributions from real estate commingled funds investments may be redeemed with proper notice, however, withdrawals may be delayed or discounted as a result of fund illiquidity.

Investments in debt securities— Fair values for debt securities are determined by a third party pricing service using recent trades and observable spreads from benchmark interest rates for similar securities.

Interest rate derivatives— Fair values of interest rate derivatives are based on broker quotes that utilize current market interest rate forecasts.

Commodity derivatives— Methods used to measure the fair value of commodity derivative forwards and options utilize forward prices and volatilities, as well as pricing adjustments for specific delivery locations, and are generally assigned a Level 2 classification. When contractual settlements relate to inactive delivery locations or extend to periods beyond those readily observable on active exchanges or quoted by brokers, the significance of the use of less observable forecasts of forward prices and volatilities on a valuation is evaluated and may result in Level 3 classification.

Electric commodity derivatives held by NSP-Minnesota and SPS include transmission congestion instruments, generally referred to as FTRs. FTRs purchased from a RTO are financial instruments that entitle or obligate the holder to monthly revenues or charges based on transmission congestion across a given transmission path. The value of an FTR is derived from, and designed to offset, the cost of transmission congestion. In addition to overall transmission load, congestion is also influenced by the operating schedules of power plants and the consumption of electricity pertinent to a given transmission path. Unplanned plant outages, scheduled plant maintenance, changes in the relative costs of fuels used in generation, weather and overall changes in demand for electricity can each impact the operating schedules of the power plants on the transmission grid and the value of an FTR.

If forecasted costs of electric transmission congestion increase or decrease for a given FTR path, the value of that particular FTR instrument will likewise increase or decrease. Given the limited observability of important inputs to the value of FTRs between auction processes, including expected plant operating schedules and retail and wholesale demand, fair value measurements for FTRs have been assigned a Level 3.

Non-trading monthly FTR settlements are included in fuel and purchased energy cost recovery mechanisms as applicable in each jurisdiction, and therefore changes in the fair value of the yet to be settled portions of most FTRs are deferred as a regulatory asset or liability. Given this regulatory treatment and the limited magnitude of FTRs relative to the electric utility operations of NSP-Minnesota and SPS, the numerous unobservable quantitative inputs pertinent to the value of FTRs are insignificant to the consolidated financial statements of Xcel Energy.

Non-Derivative Fair Value Measurements

The NRC requires NSP-Minnesota to maintain a portfolio of investments to fund the costs of decommissioning its nuclear generating plants. Assets of the nuclear decommissioning fund are legally restricted for the purpose of decommissioning these facilities. The fund contains cash equivalents, debt securities, equity securities and other investments. NSP-Minnesota uses the MPUC approved asset allocation for the escrow and investment targets by asset class for both the escrow and qualified trust.

NSP-Minnesota recognizes the costs of funding the decommissioning over the lives of the nuclear plants, assuming rate recovery of all costs. Realized and unrealized gains on fund investments over the life of the fund are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Consequently, any realized and unrealized gains and losses on securities in the nuclear decommissioning fund are deferred as a component of the regulatory asset.

Unrealized gains for the nuclear decommissioning fund were $450 million and $560 million as of Dec. 31, 2018 and 2017, respectively, and unrealized losses were $45 million and $7 million as of Dec. 31, 2018 and 2017, respectively.

Non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund:

	Dec. 31, 2018
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		NAV		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	24	$	24	$	—	$	—	$	—	$	24
Commingled funds	758		79		—		—		819		898
Debt securities	466		—		436		—		—		436
Equity securities	401		697		—		—		—		697
Total	$	1,649	$	800	$	436	$	—	$	819	$	2,055

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $141 million of equity investments in unconsolidated subsidiaries and $121 million of rabbi trust assets and miscellaneous investments.

	Dec. 31, 2017
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		NAV		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	29	$	29	$	—	$	—	$	—	$	29
Commingled funds	701		223		—		—		659		882
Debt securities	438		—		441		—		—		441
Equity securities	423		791		—		—		—		791
Total	$	1,591	$	1,043	$	441	$	—	$	659	$	2,143

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $140 million of equity investments in unconsolidated subsidiaries and $114 million of rabbi trust assets and miscellaneous investments.

For the years ended Dec. 31, 2018 and 2017, there were no Level 3 nuclear decommissioning fund investments or transfer of amounts between levels.

Contractual maturity dates of debt securities in the nuclear decommissioning fund as of Dec. 31, 2018:

	Final Contractual Maturity
(Millions of Dollars)	Due in 1 Year or Less		Due in 1 to 5 Years		Due in 5 to 10 Years		Due after 10 Years		Total
Debt securities	$	10	$	107	$	211	$	108	$	436

Rabbi Trusts

Xcel Energy has established rabbi trusts to provide partial funding for future distributions of its SERP and deferred compensation plan.

Cost and fair value of assets held in rabbi trusts:

	Dec. 31, 2018
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	16	$	16	$	—	$	—	$	16
Mutual funds	52		51		—		—		51
Total	$	68	$	67	$	—	$	—	$	67

	Dec. 31, 2017
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	12	$	12	$	—	$	—	$	12
Mutual funds	47		50		—		—		50
Total	$	59	$	62	$	—	$	—	$	62

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet.

Derivative Fair Value Measurements

Xcel Energy enters into derivative instruments, including forward contracts, futures, swaps and options, for trading purposes and to manage risk in connection with changes in interest rates, utility commodity prices and vehicle fuel prices.

Interest Rate Derivatives — Xcel Energy enters into various instruments that effectively fix the interest payments on certain floating rate debt obligations or effectively fix the yield or price on a specified benchmark interest rate for an anticipated debt issuance for a specific period. These derivative instruments are generally designated as cash flow hedges for accounting purposes.

As of Dec. 31, 2018, accumulated other comprehensive losses related to interest rate derivatives included $3 million of net losses expected to be reclassified into earnings during the next 12 months as the hedged transactions impact earnings.

As of Dec 31, 2018, Xcel Energy had unsettled interest rate swaps outstanding with a notional amount of $300 million. These interest rate derivatives were designated as hedges, and as such, changes in fair value are recorded to other comprehensive income.

Wholesale and Commodity Trading Risk — Xcel Energy Inc.’s utility subsidiaries conduct various wholesale and commodity trading activities, including the purchase and sale of electric capacity, energy, energy-related instruments and natural gas-related instruments, including derivatives. Xcel Energy is allowed to conduct these activities within guidelines and limitations as approved by its risk management committee, comprised of management personnel not directly involved in activities governed by this policy.

Commodity Derivatives — Xcel Energy enters into derivative instruments to manage variability of future cash flows from changes in commodity prices in its electric and natural gas operations, as well as for trading purposes. This could include the purchase or sale of energy or energy-related products, natural gas to generate electric energy, natural gas for resale, FTRs, vehicle fuel and weather derivatives.

As of Dec. 31, 2018, Xcel Energy had no vehicle fuel contracts designated as cash flow hedges. Xcel Energy may enter into derivative instruments that mitigate commodity price risk on behalf of electric and natural gas customers, but may not be designated as qualifying hedging transactions. Changes in the fair value of non-trading commodity derivative instruments are recorded in other comprehensive income or deferred as a regulatory asset or liability. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms. Immaterial amounts to income related to the ineffectiveness of cash flow hedges were recorded for the years ended Dec. 31, 2018 and 2017.

As of Dec. 31, 2018, there were no net gains related to commodity derivative cash flow hedges recorded as a component of accumulated other comprehensive losses or related amounts expected to be reclassified into earnings during the next 12 months.

Xcel Energy enters into commodity derivative instruments for trading purposes not directly related to commodity price risks associated with serving its electric and natural gas customers. Changes in the fair value of these commodity derivatives are recorded in electric operating revenues, net of amounts credited to customers under margin-sharing mechanisms.

Gross notional amounts of commodity forwards, options and FTRs as of Dec. 31:

(Amounts in Millions) (a) (b)	2018	2017
MWh of electricity	87	68
MMBtu of natural gas	92	37

^(a)  Amounts are not reflective of net positions in the underlying commodities.

^(b)  Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

Consideration of Credit Risk and Concentrations — Xcel Energy continuously monitors the creditworthiness of counterparties to its interest rate derivatives and commodity derivative contracts prior to settlement, and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented in the consolidated balance sheets.

Xcel Energy’s utility subsidiaries’ most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to their wholesale, trading and non-trading commodity activities.

As of Dec. 31, 2018, six of Xcel Energy’s 10 most significant counterparties for these activities, comprising $96 million or 43% of this credit exposure, had investment grade credit ratings from Standard & Poor’s, Moody’s or Fitch Ratings. Three of the 10 most significant counterparties, comprising $20 million or 9% of this credit exposure, were not rated by these external agencies, but based on Xcel Energy’s internal analysis, had credit quality consistent with investment grade. One of these significant counterparties, comprising $12 million or 5% of this credit exposure, had credit quality less than investment grade, based on Xcel Energy’s internal analysis. Eight of these significant counterparties are municipal or cooperative electric entities or other utilities.

Qualifying Cash Flow Hedges — Financial impact of qualifying interest rate and vehicle fuel cash flow hedges on Xcel Energy’s accumulated other comprehensive loss, included in the consolidated statements of common stockholders’ equity and in the consolidated statements of comprehensive income:

(Millions of Dollars)	2018			2017			2016
Accumulated other comprehensive loss related to cash flow hedges at Jan. 1	$	(58	)	$	(51	)	$	(55	)
After-tax net unrealized losses related to derivatives accounted for as hedges	(5		)	—			—
After-tax net realized losses on derivative transactions reclassified into earnings	3			3			4
Adoption of ASU. 2018-02 (a)	—			(10		)	—
Accumulated other comprehensive loss related to cash flow hedges at Dec. 31	$	(60	)	$	(58	)	$	(51	)

^(a)  In 2017, Xcel Energy implemented ASU No. 2018-02 related to TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.

Impact of derivative activity:

	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:
(Millions of Dollars)	Accumulated Other Comprehensive Loss			Regulatory (Assets) and Liabilities
Year Ended Dec. 31, 2018
Derivatives designated as cash flow hedges
Interest rate	$	(7	)	$	—
Total	$	(7	)	$	—
Other derivative instruments
Electric commodity	$	—		$	1
Natural gas commodity	—			10
Total	$	—		$	11
Year Ended Dec. 31, 2017
Other derivative instruments
Electric commodity	$	—		$	10
Natural gas commodity	—			(13		)
Total	$	—		$	(3	)
Year Ended Dec. 31, 2016
Other derivative instruments
Electric commodity	$	—		$	17
Natural gas commodity	—			1
Total	$	—		$	18

	Pre-Tax (Gains) Losses Reclassified into Income During the Period from:							Pre-Tax Gains (Losses) Recognized During the Period in Income
(Millions of Dollars)	Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Year Ended Dec. 31, 2018
Derivatives designated as cash flow hedges
Interest rate	$	4	(a)	$	—			$	—
Total	$	4		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	14		(b)
Electric commodity	—			(1		)	(c)	—
Natural gas commodity	—			(6		)	(d)	(4		)	(d)
Total	$	—		$	(7	)		$	10
Year Ended Dec. 31, 2017
Derivatives designated as cash flow hedges
Interest rate	$	5	(a)	$	—			$	—
Total	$	5		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	10		(b)
Electric commodity	—			(15		)	(c)	—
Natural gas commodity	—			3			(d)	(6		)	(d)
Total	$	—		$	(12	)		$	4
Year Ended Dec. 31, 2016
Derivatives designated as cash flow hedges
Interest rate	$	6	(a)	$	—			$	—
Total	$	6		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	2		(b)
Electric commodity	—			(8		)	(c)	—
Natural gas commodity	—			15			(d)	(8		)	(d)
Total	$	—		$	7			$	(6	)

^(a)  Amounts recorded to interest charges.

^(b)  Amounts recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.

^(c)  Amounts recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.

^(d)  Amounts for the year ended Dec. 31, 2018 included $1 million of settlement losses on derivatives entered to mitigate natural gas price risk for electric generation recorded to electric fuel and purchased power, subject to cost-recovery mechanisms and reclassified to a regulatory asset, as appropriate. Such gains and losses for the years ended Dec. 31, 2017 and 2016 were immaterial. Remaining settlement losses for the years ended Dec. 31, 2018, 2017 and 2016 related to natural gas operations and were recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

Xcel Energy had no derivative instruments designated as fair value hedges during the years ended Dec. 31, 2018, 2017 and 2016.

Credit Related Contingent Features—Contract provisions for derivative instruments that the utility subsidiaries enter, including those accounted for as normal purchase-normal sale contracts and therefore not reflected on the consolidated balance sheets, may require the posting of collateral or settlement of the contracts for various reasons, including if the applicable utility subsidiary’s credit ratings are downgraded below its investment grade credit rating by any of the major credit rating agencies, or for cross default contractual provisions if there was a failure under other financing arrangements related to payment terms or other covenants. As of Dec. 31, 2018 and 2017, there were no derivative instruments in a liability position with such underlying contract provisions.

Certain derivative instruments are also subject to contract provisions that contain adequate assurance clauses. These provisions allow counterparties to seek performance assurance, including cash collateral, in the event that a given utility subsidiary’s ability to fulfill its contractual obligations is reasonably expected to be impaired. Xcel Energy had no collateral posted related to adequate assurance clauses in derivative contracts as of Dec. 31, 2018 and 2017.

Recurring Fair Value Measurements — Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis:

	Dec. 31, 2018													Dec. 31, 2017
	Fair Value						Fair Value Total		Netting (a)					Fair Value						Fair Value Total		Netting (a)
(Millions of Dollars)	Level 1		Level 2		Level 3							Total		Level 1		Level 2		Level 3							Total
Current derivative assets
Commodity trading	$	4	$	92	$	2	$	98	$	(44	)	$	54	$	2	$	22	$	—	$	24	$	(15	)	$	9
Electric commodity	—		—		25		25		—			25		—		—		32		32		(2		)	30
Natural gas commodity	—		4		—		4		—			4		—		—		—		—		—			—
Total current derivative assets	$	4	$	96	$	27	$	127	$	(44	)	83		$	2	$	22	$	32	$	56	$	(17	)	39
PPAs (b)												4													5
Current derivative instruments												$	87												$	44
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	—	$	27	$	5	$	32	$	(14	)	$	18	$	—	$	31	$	5	$	36	$	(7	)	$	29
Total noncurrent derivative assets	$	—	$	27	$	5	$	32	$	(14	)	18		$	—	$	31	$	5	$	36	$	(7	)	29
PPAs (b)												16													19
Noncurrent derivative instruments												$	34												$	48

	Dec. 31, 2018													Dec. 31, 2017
	Fair Value						Fair Value Total		Netting (a)					Fair Value						Fair Value Total		Netting (a)
(Millions of Dollars)	Level 1		Level 2		Level 3							Total		Level 1		Level 2		Level 3							Total
Current derivative liabilities
Derivatives designated as cash flow hedges:
Interest rate	$	—	$	7	$	—	$	7	$	—		$	7	$	—	$	—	$	—	$	—	$	—		$	—
Other derivative instruments:
Commodity trading	4		88		2		94		(60		)	34		2		18		—		20		(15		)	5
Electric commodity	—		—		—		—		—			—		—		—		2		2		(2		)	—
Natural gas commodity	—		—		—		—		—			—		—		1		—		1		—			1
Total current derivative liabilities	$	4	$	95	$	2	$	101	$	(60	)	41		$	2	$	19	$	2	$	23	$	(17	)	6
PPAs (b)												20													23
Current derivative instruments												$	61												$	29
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	—	$	18	$	1	$	19	$	17		$	36	$	—	$	24	$	—	$	24	$	(10	)	$	14
Total noncurrent derivative liabilities	$	—	$	18	$	1	$	19	$	17		36		$	—	$	24	$	—	$	24	$	(10	)	14
PPAs (b)												93													112
Noncurrent derivative instruments												$	129												$	126

^(a)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements as of Dec. 31, 2018 and 2017. At Dec. 31, 2018 and 2017, derivative assets and liabilities include $32 million and $0 million of obligations to return cash collateral, respectively. At Dec. 31, 2018 and 2017, derivative assets and liabilities include rights to reclaim cash collateral of $15 million and $3 million, respectively. Counterparty netting excludes settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

^(b)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

Changes in Level 3 commodity derivatives:

	Year Ended Dec. 31
(Millions of Dollars)	2018			2017			2016
Balance at Jan. 1	$	35		$	17		$	18
Purchases	59			82			35
Settlements	(59		)	(97		)	(89		)
Net transactions recorded during the period:
(Losses) gains recognized in earnings (a)	(1		)	5			—
Net (losses) gains recognized as regulatory assets and liabilities	(5		)	28			53
Balance at Dec. 31	$	29		$	35		$	17

^(a)  Amounts relate to commodity derivatives held at the end of the period.

Xcel Energy recognizes transfers between levels as of the beginning of each period. There were no transfers of amounts between levels for derivative instruments for 2016 - 2018.

Fair Value of Long-Term Debt

As of Dec. 31, other financial instruments for which the carrying amount did not equal fair value:

	2018				2017
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	16,209	$	16,755	$	14,977	$	16,531

Fair value of Xcel Energy’s long-term debt is estimated based on recent trades and observable spreads from benchmark interest rates for similar securities. Fair value estimates are based on information available to management as of Dec. 31, 2018 and 2017, and given the observability of the inputs, fair values presented for long-term debt were assigned as Level 2.

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Benefit Plans and Other Postretirement Benefits

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Benefit Plans and Other Postretirement Benefits

Benefit Plans and Other Postretirement Benefits

Pension and Postretirement Health Care Benefits

Xcel Energy has several noncontributory, defined benefit pension plans that cover almost all employees. Generally, benefits are based on a combination of years of service and average pay. Xcel Energy’s policy is to fully fund into an external trust the actuarially determined pension costs subject to the limitations of applicable employee benefit and tax laws.

In addition to the qualified pension plans, Xcel Energy maintains a SERP and a nonqualified pension plan. The SERP is maintained for certain executives that were participants in the plan in 2008, when the SERP was closed to new participants. The nonqualified pension plan provides benefits for compensation that is in excess of the limits applicable to the qualified pension plans, with distributions funded by Xcel Energy’s consolidated operating cash flows. Obligations of the SERP and nonqualified plan as of Dec. 31, 2018 and 2017 were $33 million and $37 million, respectively. Xcel Energy recognized net benefit cost for the SERP and nonqualified plans of $4 million in 2018 and $5 million in 2017.

In 2016, Xcel Energy established rabbi trusts to provide partial funding for future distributions of the SERP and its deferred compensation plan, supplemented by Xcel Energy’s consolidated operating cash flows.

Xcel Energy has a contributory health and welfare benefit plan that provides health care and death benefits to certain Xcel Energy retirees.

• NSP-Minnesota and NSP-Wisconsin discontinued subsidizing health care benefits for non-bargaining employees retiring after 1998 and for bargaining employees who retired after 1999.

• Xcel Energy discontinued subsidizing health care benefits for nonbargaining employees of the former NCE who retired after June 30, 2003.

• Xcel Energy discontinued health care benefits for SPS bargaining employees hired after Jan. 1, 2012.

Xcel Energy bases the investment-return assumption on expected long-term performance for each of the asset classes in its pension and postretirement health care portfolios. For pension assets, Xcel Energy considers the historical returns achieved by its asset portfolio over the past 20 years or longer period, as well as long-term projected return levels.

Pension cost determination assumes a forecasted mix of investment types over the long-term.

• Investment returns in 2018 were below the assumed level of 6.87%;

• Investment returns in 2017 were above the assumed level of 6.87%;

• Investment returns in 2016 were below the assumed level of 6.87%; and,

• In 2019, Xcel Energy’s expected investment-return assumption is 6.87%.

Pension plan and postretirement benefit assets are invested in a portfolio according to Xcel Energy’s return, liquidity and diversification objectives to provide a source of funding for plan obligations and minimize contributions to the plan, within appropriate levels of risk. The principal mechanism for achieving these objectives is the asset allocation given the long-term risk, return, correlation and liquidity characteristics of each particular asset class. There were no significant concentrations of risk in any industry, index, or entity. Market volatility can impact even well-diversified portfolios and significantly affect the return levels achieved by the assets in any year.

State agencies also have issued guidelines to the funding of postretirement benefit costs. SPS is required to fund postretirement benefit costs for Texas and New Mexico amounts collected in rates. PSCo is required to fund postretirement benefit costs in irrevocable external trusts that are dedicated to the payment of these postretirement benefits. These assets are invested in a manner consistent with the investment strategy for the pension plan.

Xcel Energy’s ongoing investment strategy is based on plan-specific investment recommendations that seek to minimize potential investment and interest rate risk as a plan’s funded status increases over time. The investment recommendations result in a greater percentage of long-duration fixed income securities being allocated to specific plans having relatively higher funded status ratios and a greater percentage of growth assets being allocated to plans having relatively lower funded status ratios.

Plan Assets

The following presents, for each of the fair value hierarchy levels, Xcel Energy’s pension plan assets measured at fair value:

	Dec. 31, 2018 (a)												Dec. 31, 2017 (a)
(Millions of Dollars)	Level 1		Level 2		Level 3		Measured at NAV			Total			Level 1			Level 2		Level 3		Measured at NAV		Total
Cash equivalents	$	137	$	—	$	—	$	—		$	137		$	196		$	—	$	—	$	—	$	196
Commingled funds:	914		—		—		987			1,901			1,054			—		—		1,075		2,129
Debt securities:	—		621		—		—			621			—			673		—		—		673
Equity securities:	106		—		—		—			106			114			—		—		—		114
Other	2		5		—		(30		)	(23		)	(29		)	4		—		1		(24		)
Total	$	1,159	$	626	$	—	$	957		$	2,742		$	1,335		$	677	$	—	$	1,076	$	3,088

^(a)  See Note 10 for further information regarding fair value measurement inputs and methods.

The following presents, for each of the fair value hierarchy levels, Xcel Energy’s postretirement benefit plan assets that were measured at fair value:

	Dec. 31, 2018 (a)										Dec. 31, 2017 (a)
(Millions of Dollars)	Level 1		Level 2		Level 3		Measured at NAV		Total		Level 1		Level 2		Level 3		Measured at NAV		Total
Cash equivalents	$	19	$	—	$	—	$	—	$	19	$	29	$	—	$	—	$	—	$	29
Insurance contracts	—		45		—		—		45		—		50		—		—		50
Commingled funds	133		—		—		40		173		148		—		—		—		148
Debt securities	—		179		—		—		179		—		198		—		—		198
Equity securities	—		—		—		—		—		35		—		—		—		35
Other	—		1		—		—		1		—		1		—		—		1
Total	$	152	$	225	$	—	$	40	$	417	$	212	$	249	$	—	$	—	$	461

^(a)  See Note 10 for further information on fair value measurement inputs and methods.

No assets were transferred in or out of Level 3 for 2018 and 2017.

Funded Status — Comparisons of the actuarially computed benefit obligation, changes in plan assets and funded status of the pension and postretirement health care plans for Xcel Energy are as follows:

	Pension Benefits						Postretirement Benefits
(Millions of Dollars)	2018			2017			2018			2017
Change in Benefit Obligation:
Obligation at Jan. 1	$	3,828		$	3,682		$	621		$	603
Service cost	94			94			2			2
Interest cost	133			147			22			24
Plan amendments	—			(13		)	—			—
Actuarial (gain) loss	(224		)	259			(62		)	33
Plan participants’ contributions	—			—			8			8
Medicare subsidy reimbursements	—			—			1			1
Benefit payments (a)	(354		)	(341		)	(50		)	(50		)
Obligation at Dec. 31	$	3,477		$	3,828		$	542		$	621
Change in Fair Value of Plan Assets:
Fair value of plan assets at Jan. 1	$	3,088		$	2,856		$	461		$	442
Actual return on plan assets	(142		)	411			(13		)	41
Employer contributions	150			162			11			20
Plan participants’ contributions	—			—			8			8
Benefit payments	(354		)	(341		)	(50		)	(50		)
Fair value of plan assets at Dec. 31	$	2,742		$	3,088		$	417		$	461
Funded status of plans at Dec. 31	$	(735	)	$	(740	)	$	(125	)	$	(160	)
Amounts recognized in the Consolidated Balance Sheet at Dec. 31:
Current liabilities	$	—		$	—		$	(7	)	$	(3	)
Noncurrent liabilities	(735		)	(740		)	(118		)	(157		)
Net amounts recognized	$	(735	)	$	(740	)	$	(125	)	$	(160	)

^(a)  Includes approximately $198 million in 2018 and $174 million in 2017 of lump-sum benefit payments used in the determination of a settlement charge.

	Pension Benefits				Postretirement Benefits
(Millions of Dollars)	2018		2017		2018		2017
Significant Assumptions Used to Measure Benefit Obligations:
Discount rate for year-end valuation	4.31	%	3.63	%	4.32	%	3.62	%
Expected average long-term increase in compensation level	3.75		3.75		N/A		N/A
Mortality table	RP-2014		RP-2014		RP-2014		RP-2014
Health care costs trend rate — initial: Pre-65	N/A		N/A		6.50	%	7.00	%
Health care costs trend rate — initial: Post-65	N/A		N/A		5.35	%	5.50	%
Ultimate trend assumption — initial: Pre-65	N/A		N/A		4.50	%	4.50	%
Ultimate trend assumption — initial: Post-65	N/A		N/A		4.50	%	4.50	%
Years until ultimate trend is reached	N/A		N/A		4		5

Accumulated benefit obligation for the pension plan was $3,275 million and $3,612 million as of Dec. 31, 2018 and 2017, respectively.

Net Periodic Benefit Cost (Credit) —Net periodic benefit cost (credit), other than the service cost component, is included in other income in the consolidated statements of income.

Components of net periodic benefit cost (credit) and amounts recognized in other comprehensive income and regulatory assets and liabilities:

	Pension Benefits									Postretirement Benefits
(Millions of Dollars)	2018			2017			2016			2018			2017			2016
Service cost	$	94		$	94		$	92		$	2		$	2		$	2
Interest cost	133			147			160			22			24			26
Expected return on plan assets	(209		)	(209		)	(210		)	(26		)	(25		)	(25		)
Amortization of prior service credit	(5		)	(2		)	(2		)	(11		)	(11		)	(11		)
Amortization of net loss	111			107			97			8			7			4
Settlement charge (a)	91			81			—			—			—			—
Net periodic pension cost (credit)	215			218			137			(5		)	(3		)	(4		)
Costs not recognized due to effects of regulation	(75		)	(79		)	(15		)	2			—			—
Net benefit cost (credit) recognized for financial reporting	$	140		$	139		$	122		$	(3	)	$	(3	)	$	(4	)
Significant Assumptions Used to Measure Costs:
Discount rate	3.63		%	4.13		%	4.66		%	3.62		%	4.13		%	4.65		%
Expected average long-term increase in compensation level	3.75			3.75			4.00			—			—			—
Expected average long-term rate of return on assets	6.87			6.87			6.87			5.30			5.80			5.80

^(a)  A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In 2018 and 2017, as a result of lump-sum distributions during the 2018 and 2017 plan years, Xcel Energy recorded a total pension settlement charge of $91 million in 2018 and $81 million in 2017, the majority of which was not recognized due to the effects of regulation. A total of $11 million and $8 million was recorded in the consolidated statements of income in 2018 and 2017, respectively.

	Pension Benefits						Postretirement Benefits
(Millions of Dollars)	2018			2017			2018			2017
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost:
Net loss	$	1,633		$	1,709		$	116		$	147
Prior service credit	(20		)	(25		)	(33		)	(44		)
Total	$	1,613		$	1,684		$	83		$	103
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost Have Been Recorded as Follows Based Upon Expected Recovery in Rates:
Current regulatory assets	$	94		$	100		$	—		$	—
Noncurrent regulatory assets	1,446			1,511			89			107
Current regulatory liabilities	—			—			(1		)	(1		)
Noncurrent regulatory liabilities	—			—			(10		)	(10		)
Deferred income taxes	19			19			1			2
Net-of-tax accumulated other comprehensive income	54			54			4			5
Total	$	1,613		$	1,684		$	83		$	103

Measurement date Dec. 31, 2018 Dec. 31, 2017 Dec. 31, 2018 Dec. 31, 2017

Cash Flows — Funding requirements can be impacted by changes to actuarial assumptions, actual asset levels and other calculations prescribed by the requirements of income tax and other pension-related regulations. Required contributions were made in 2016 - 2019 to meet minimum funding requirements.

Voluntary and required pension funding contributions:

• $150 million in January 2019;

• $150 million in 2018;

• $162 million in 2017; and,

• $125 million in 2016.

The postretirement health care plans have no funding requirements other than fulfilling benefit payment obligations, when claims are presented and approved. Additional cash funding requirements are prescribed by certain state and federal rate regulatory authorities.

Voluntary postretirement funding contributions:

• Expects to contribute approximately $11 million during 2019;

• $11 million during 2018;

• $20 million during 2017; and,

• $18 million during 2016.

Targeted asset allocations:

	Pension Benefits				Postretirement Benefits
	2018		2017		2018		2017
Domestic and international equity securities	36	%	36	%	18	%	24	%
Long-duration fixed income securities	30		27		—		—
Short-to-intermediate fixed income securities	17		20		70		60
Alternative investments	15		15		8		9
Cash	2		2		4		7
Total	100	%	100	%	100	%	100	%

Plan Amendments —The Xcel Energy Pension Plan and Xcel Energy Inc. Nonbargaining Pension Plan (South) were amended in 2017 to reduce supplemental benefits for non-bargaining participants as well as to allow the transfer of a portion of non-qualified pension obligations into the qualified plans. In 2016, the Xcel Energy Pension Plan was amended to change the discount rate basis for lump-sum conversion to annuity participants and annuity conversion to lump-sum participants. Annual credits contributed to the PSCo Bargaining Plan retirement spending account also increased.

In 2018 and 2017, there were no plan amendments made which affected the postretirement benefit obligation.

Projected Benefit Payments

Xcel Energy’s projected benefit payments:

(Millions of Dollars)	Projected Pension Benefit Payments		Gross Projected Postretirement Health Care Benefit Payments		Expected Medicare Part D Subsidies		Net Projected Postretirement Health Care Benefit Payments
2019	$	281	$	45	$	2	$	43
2020	260		45		2		43
2021	259		45		2		43
2022	260		44		2		42
2023	259		43		2		41
2024-2028	1,238		197		13		184

Defined Contribution Plans

Xcel Energy maintains 401(k) and other defined contribution plans that cover most employees. Total expense to these plans was approximately $38 million in 2018, $37 million in 2017 and $36 million in 2016.

Multiemployer Plans

NSP-Minnesota and NSP-Wisconsin each contribute to several union multiemployer pension and other postretirement benefit plans, none of which are individually significant. These plans provide pension and postretirement health care benefits to certain union employees who may perform services for multiple employers and do not participate in the NSP-Minnesota and NSP-Wisconsin sponsored pension and postretirement health care plans. Contributing to these types of plans creates risk that differs from providing benefits under NSP-Minnesota and NSP-Wisconsin sponsored plans, in that if another participating employer ceases to contribute to a multiemployer plan, additional unfunded obligations may need to be funded over time by remaining participating employers.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal

Xcel Energy is involved in various litigation matters that are being defended and handled in the ordinary course of business. Assessing whether a loss is probable or a reasonable possibility, and whether the loss or a range of loss is estimable, often involves complex judgments regarding future events. Management maintains accruals for losses that are probable of being incurred and subject to reasonable estimation. Management may be unable to estimate an amount or range of a reasonably possible loss in certain situations, including when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate the ultimate liabilities, if any, arising from such current proceedings would have a material effect on Xcel Energy’s financial statements. Unless otherwise required by GAAP, legal fees are expensed as incurred.

Gas Trading Litigation —e prime is a wholly owned subsidiary of Xcel Energy. e prime was in the business of natural gas trading and marketing but has not engaged in natural gas trading or marketing activities since 2003.  Multiple lawsuits seeking monetary damages were commenced against e prime and its affiliates, including Xcel Energy, between 2003 and 2009 alleging fraud and anticompetitive activities in conspiring to restrain the trade of natural gas and manipulate natural gas prices. Cases were all consolidated in the U.S. District Court in Nevada.

In the fourth quarter of 2018, four cases were settled. Two cases remain active which include an MDL matter consisting of a Colorado class (Breckenridge) and a Wisconsin class (Arandell Corp.).

Breckenridge/Colorado— Case has been remanded to the MDL panel, and is expected to be referred back to the U.S. District Court in Colorado. Xcel Energy has concluded that a loss is remote.

Arandell Corp. — In November 2017, the U.S. District Court in Nevada granted summary judgment against two plaintiffs in the Arandell Corp. case in favor of Xcel Energy and NSP-Wisconsin, leaving only three individual plaintiffs remaining in the litigation. In addition, the plaintiffs’ motions for class certification and remand back to originating courts were denied in March 2017.

Plaintiffs have asked the lower court to remand the cases back to the court where the actions were originally filed anticipating class certification. A hearing date has not been set. Xcel Energy has concluded that a loss is remote.

Line Extension Disputes — In December 2015, the DRC filed a lawsuit seeking monetary damages in the Denver District Court, stating PSCo failed to award proper allowances and refunds for line extensions to new developments pursuant to the terms of electric and gas service agreements. The dispute involves claims by over fifty developers. In February 2018, the Colorado Supreme Court denied DRC’s petition to appeal the Denver District Court’s dismissal of the lawsuit, effectively terminating this litigation. However, in January 2018, DRC filed a new lawsuit in Boulder County District Court, asserting a single claim that PSCo was required to file its line extension agreements with the CPUC but failed to do so.

This claim is substantially similar to the arguments previously raised by DRC. PSCo filed a motion to dismiss this claim, which was granted in May 2018. DRC subsequently filed an appeal to the Colorado Court of Appeals with its opening brief in January 2019 and PSCo filed its answer brief in February 2019. It is uncertain when a decision will be rendered.

PSCo has concluded that a loss is remote with respect to both of these matters as the service agreements were developed to implement CPUC approved tariffs and PSCo has complied with the tariff provisions. If a loss were sustained, PSCo believes it would be allowed to recover costs through traditional regulatory mechanisms. Amount or range in dispute is presently unknown and no accrual has been recorded for this matter.

Rate Matters

NSP-Minnesota — Sherco — In NSP-Minnesota’s 2013 fuel reconciliation filing, the MPUC made recovery of replacement power costs associated with the 2011 incident at its Sherco Unit 3 plant provisional and subject to further review following conclusion of litigation commenced by NSP-Minnesota, SMMPA (Co-owner of Sherco Unit 3) and insurance companies against GE.

In 2018, NSP-Minnesota and SMMPA reached a settlement with GE. NSP-Minnesota has notified the MPUC of its proposal to refund the GE settlement proceeds back to customers through the FCA.

The insurance providers continued their litigation against GE and the case went to trial. In 2018, GE prevailed in the lawsuit with the insurance companies, however, the jury found comparable fault, finding that GE was 52% and NSP-Minnesota was 48% at fault. At that point in the litigation, NSP-Minnesota was no longer involved in the case and was not present to make arguments about its role in the event. The specific issue leading to the fault apportionment was also not before the jury and not relevant to the outcome of the trial.

In January 2019, the DOC recommended that NSP-Minnesota refund $20 million of previously recovered purchased power costs to its customers, based on the jury’s apportionment of fault. The OAG recommended the MPUC withhold any decision until the underlying litigation by the insurance providers (currently under appeal) is concluded. The DOC subsequently filed comments agreeing with the OAG’s recommendation to withhold a decision pending the outcome of any appeals.

NSP-Minnesota filed reply comments arguing that the DOC recommendations are without merit and that it acted prudently in operating the plant and its settlement with GE was reasonable.

MISO ROE Complaints — In November 2013 and February 2015, customers filed complaints against MISO TOs including NSP-Minnesota and NSP-Wisconsin. The first complaint argued for a reduction in the base ROE in MISO transmission formula rates from 12.38% to 9.15%, and removal of ROE adders (including those for RTO membership).The second complaint sought to reduce base ROE from 12.38% to 8.67%.

In September 2016, the FERC issued an order granting a 10.32% base ROE (10.82% with the RTO adder) effective for the first complaint period of Nov. 12, 2013 to Feb. 11, 2015 and subsequent to the date of the order. The D.C. Circuit subsequently vacated and remanded FERC Opinion No. 531, which had established the ROE methodology on which the September 2016 FERC order was based.

In October 2018, the FERC issued a NETO base ROE order that addressed the D.C. Circuit’s actions on Opinion No. 531. Under a new proposed two step ROE approach, the FERC has indicated an intention to dismiss an ROE complaint if the existing ROE falls within the range of just and reasonable ROEs based on equal weighting of the DCF, CAPM, and Expected Earnings models. The FERC proposes that if necessary, it would then set a new ROE by averaging the results of these models plus a Risk Premium model.

With respect to the MISO TOs, the FERC subsequently made preliminary determinations in a November 2018 order that the MISO base ROE in effect for the first complaint period (12.38%) was outside the range of reasonableness, and should be reduced. The FERC indicated its preliminary analysis using the new ROE approach resulted in a base ROE of 10.28% for the first compliant period, compared to the previously ordered base ROE of 10.32%. A procedural schedule has been set for the first half of 2019, with the FERC expected to act no earlier than the second half of 2019. NSP-Minnesota has recognized a current refund liability consistent with its best estimate of the final ROE.

SPP OATT Upgrade Costs — Under the SPP OATT, costs of transmission upgrades may be recovered from other SPP customers whose transmission service depends on capacity enabled by the upgrade. The SPP OATT has allowed SPP to charge for these upgrades since 2008, but SPP had not been charging its customers for these upgrades. In 2016, the FERC granted SPP’s request to recover these previously unbilled charges. SPP subsequently billed SPS approximately $13 million for these charges.

In July 2018, SPS’ appeal to the D.C. Circuit over the FERC rulings granting SPP the right to recover these previously unbilled charges was remanded to the FERC. Assessment of these charges (from 2008 - 2016) is being reviewed by the FERC, which is expected to rule in the first quarter of 2019.

In October 2017, SPS filed a separate complaint against SPP asserting that SPP has assessed upgrade charges to SPS in violation of the SPP OATT. The FERC has granted a rehearing for further consideration in May 2018. The timing of FERC action on the SPS rehearing is uncertain. If SPS’ complaint results in additional charges or refunds, it will seek to recover or refund the differential in future rate proceedings.

Environmental

New and changing federal and state environmental mandates can create financial liabilities for Xcel Energy, which are normally recovered through the regulated rate process.

Site Remediation — Various federal and state environmental laws impose liability where hazardous substances or other regulated materials have been released to the environment. Xcel Energy Inc.’s subsidiaries may sometimes pay all or a portion of the cost to remediate sites where past activities of their predecessors or other parties have caused environmental contamination. Environmental contingencies could arise from various situations, including sites of former MGPs; and third-party sites, such as landfills, for which one or more of Xcel Energy Inc.’s subsidiaries are alleged to have sent wastes to that site.

MGP Sites

Ashland MGP Site — NSP-Wisconsin was named a responsible party for contamination at the Ashland/Northern States Power Lakefront Superfund Site (the Site) in Ashland, Wisconsin. Remediation and restoration activities are anticipated to be completed in 2019 and groundwater treatment activities will continue for many years.

Current cost estimate for remediation of the entire site is approximately $192 million, of which approximately $165 million has been spent. As of Dec. 31, 2018 and 2017, NSP-Wisconsin recorded a total liability of $27 million and $30 million, respectively, for the entire site.

NSP-Wisconsin has deferred the unrecovered portion of the estimated Site remediation costs as a regulatory asset. The PSCW has authorized NSP-Wisconsin rate recovery for all remediation costs incurred at the Site. In 2012, the PSCW agreed to allow NSP-Wisconsin to pre-collect certain costs, to amortize costs over a 10-year period and to apply a 3% carrying cost to the unamortized regulatory asset.

MGP, Landfill or Disposal Sites — Xcel Energy is currently investigating or remediating twelve MGP, landfill or other disposal sites across its service territories, in addition to the Ashland MGP Site, and these activities will continue through at least 2019. Xcel Energy accrued $9 million as of Dec. 31, 2018 and $19 million as of Dec. 31, 2017 for these sites. There may be insurance recovery and/or recovery from other potentially responsible parties, offsetting a portion of the costs incurred.

Environmental Requirements — Water and Waste

Coal Ash Regulation —Xcel Energy’s operations are subject to federal and state laws that impose requirements for handling, storage, treatment and disposal of solid waste. In 2015, the EPA published the CCR Rule. Litigation was brought challenging the rule in the D.C. Circuit.

Under the CCR Rule, utilities are required to complete groundwater sampling around their CCR landfills and surface impoundments. Xcel Energy has identified at least two sites in Colorado where SSLs exist in the groundwater near landfills and/or impoundments. Xcel Energy has completed removal of CCR from these impoundments and plans to close these landfills. By the end of 2019, only nine of Xcel Energy’s regulated ash units are expected to be in operation. Xcel Energy is conducting additional groundwater sampling and will evaluate whether corrective action is required at any CCR landfills or surface impoundments.

Until Xcel Energy completes its assessment, it is uncertain what impact, if any, there will be on the operations, financial condition or cash flows. In August 2018, the D.C. Circuit ruled that the EPA cannot allow utilities to continue to use unlined impoundments (including clay lined impoundments) for the storage or disposal of coal ash. Litigation is ongoing regarding the deadline for closing or retrofitting these impoundments. The decision will require Xcel Energy to expedite closure of one impoundment in Minnesota (see ARO removal costs below) and will require construction of a new impoundment, which is estimated to cost $6 million.

Federal CWA WOTUS Rule —In 2015, the EPA and Corps published a final rule that significantly broadened the scope of waters under the CWA that are subject to federal jurisdiction, referred to as “WOTUS”. The Rule has been subject to significant litigation and is currently stayed in a portion of the country. Xcel Energy cannot estimate potential impacts until the legal and administrative processes are finalized, but expects costs will be recoverable through regulatory mechanisms.

Federal CWA ELG — In 2015, the EPA issued a final ELG rule for power plants that discharge treated effluent to surface waters as well as utility-owned landfills that receive CCRs. In 2017, the EPA delayed the compliance date for flue gas desulfurization wastewater and bottom ash transport until November 2020. After 2020, Xcel Energy estimates that ELG compliance will cost approximately $12 million to complete. The EPA, however, is conducting a rulemaking process to potentially revise the effluent limitations and pretreatment standards, which may impact compliance costs. Xcel Energy anticipates these costs will be fully recoverable through regulatory mechanisms.

Federal CWA Section 316(b) — The federal CWA requires the EPA to regulate cooling water intake structures to assure that these structures reflect the best technology available for minimizing impingement and entrainment of aquatic species. Xcel Energy estimates the likely cost for complying with impingement and entrainment requirements is approximately $40 million, to be incurred between 2019 and 2028. Xcel Energy believes six NSP-Minnesota plants and two NSP-Wisconsin plants could be required by state regulators to make improvements to reduce impingement and entrainment. The exact total cost of the impingement and entrainment improvements is uncertain, but could be up to approximately $200 million. Xcel Energy anticipates these costs will be fully recoverable through regulatory mechanisms.

Environmental Requirements — Air

Regional Haze Rules — The regional haze program requires SO₂, NO_X and PM emission controls at power plants to reduce visibility impairment in national parks and wilderness areas. The program includes BART and reasonable further progress.

The requirements of the first regional haze plans developed by Minnesota and Colorado have been approved and implemented. Texas’ first regional haze plan has undergone federal review as described below.

BART Determination for Texas: The EPA has issued a revised final rule adopting a BART alternative Texas only SO₂ trading program that applies to all Harrington and Tolk units. Under the trading program, SPS expects the allowance allocations to be sufficient for SO₂ emissions. The anticipated costs of compliance are not expected to have a material impact; and SPS believes that compliance costs would be recoverable through regulatory mechanisms.

Several parties have challenged whether the final rule issued by the EPA should be considered to have met the requirements imposed in a Consent Decree entered by the United States District Court for the District of Columbia that established deadlines for the EPA to take final action on state regional haze plan submissions. The court has required status reports from the parties while the EPA works on the reconsideration rulemaking.

In December 2017, the National Parks Conservation Association, Sierra Club, and Environmental Defense Fund appealed the EPA’s 2017 final BART rule to the Fifth Circuit and filed a petition for administrative reconsideration. In January 2018, the court granted SPS’ motion to intervene in the Fifth Circuit litigation in support of the EPA’s final rule. The court has held the litigation in abeyance while the EPA decided whether to reconsider the rule. In August 2018, the EPA started a reconsideration rulemaking. It is not known when the EPA will make a final decision on this proposal.

Reasonable Progress Rule: In 2016, the EPA adopted a final rule establishing a federal implementation plan for reasonable further progress under the regional haze program for the state of Texas. The rule imposes SO₂ emission limitations that would require the installation of dry scrubbers on Tolk Units 1 and 2, with compliance required by February 2021. Investment costs associated with dry scrubbers could be $600 million. SPS appealed the EPA’s decision and obtained a stay of the final rule.

In March 2017, the Fifth Circuit remanded the rule to the EPA for reconsideration, leaving the stay in effect. In a future rulemaking, the EPA will address whether SO₂ emission reductions beyond those required in the BART alternative rule are needed at Tolk under the “reasonable progress” requirements. The EPA has not announced a schedule for acting on the remanded rule.

Implementation of the NAAQS for SO₂ — The EPA has designated all areas near SPS’ generating plants as attaining the SO₂ NAAQS with an exception. The EPA issued final designations which found the area near the SPS Harrington plant as “unclassifiable.” The area near the Harrington plant is to be monitored for three years and a final designation is expected to be made by December 2020.

If the area near the Harrington plant is designated nonattainment in 2020, the TCEQ will need to develop an implementation plan, designed to achieve the NAAQS by 2025. The TCEQ could require additional SO₂ controls at Harrington as part of such a plan. Xcel Energy cannot evaluate the impacts until the final designation is made and any required state plans are developed. Xcel Energy believes that should SO₂ control systems be required for a plant, compliance costs or the costs of alternative cost-effective generation will be recoverable through regulatory mechanisms and therefore does not expect a material impact on results of operations, financial condition or cash flows.

AROs — AROs have been recorded for Xcel Energy’s assets. For nuclear assets, the ARO is associated with the decommissioning of the NSP-Minnesota nuclear generating plants, Monticello and PI.

Aggregate fair value of NSP-Minnesota’s legally restricted assets, for funding future nuclear decommissioning, was $2.1 billion for 2018 and 2017.

Xcel Energy’s AROs were as follows:

	Dec. 31, 2018
(Millions  of Dollars)	Jan. 1, 2018		Amounts Incurred (a)		Amounts Settled (b)			Accretion		Cash Flow Revisions(c)			Dec. 31, 2018
Electric
Nuclear	$	1,874	$	—	$	—		$	94	$	—		$	1,968
Steam, hydro, and other production	192		—		(14		)	8		(9		)	177
Wind	96		12		—			4		7			119
Distribution	21		—		—			1		20			42
Miscellaneous	5		—		—			—		2			7
Natural gas
Transmission and distribution	282		—		—			13		(46		)	249
Miscellaneous	4		—		—			—		—			4
Common
Miscellaneous	1		—		—			—		—			1
Non-utility
Miscellaneous	—		1		—			—		—			1
Total liability	$	2,475	$	13	$	(14	)	$	120	$	(26	)	$	2,568

^(a)  Amounts incurred related to the PSCo Rush Creek wind farm and Nicollet Projects community solar gardens, which were placed in service in 2018.

^(b)  Amounts settled related to asbestos abatement projects and closure of certain ash containment facilities.

^(c)  In 2018, AROs were revised for changes in timing and estimates of cash flows. Changes in gas transmission and distribution AROs were primarily related to increased gas line mileage and number of services, which were more than offset by increased discount rates. Changes in electric distribution AROs primarily related to increased labor costs.

	Dec. 31, 2017
(Millions  of Dollars)	Jan. 1, 2017		Amounts Incurred		Amounts Settled(a)			Accretion		Cash Flow Revisions(b)			Dec. 31, 2017
Electric
Nuclear	$	2,249	$	—	$	—		$	114	$	(489	)	$	1,874
Steam, hydro, and other production	205		1		(29		)	9		6			192
Wind	92		—		—			4		—			96
Distribution	20		—		—			1		—			21
Miscellaneous	5		—		—			—		—			5
Natural gas
Transmission and distribution	205		—		—			8		69			282
Miscellaneous	4		—		—			—		—			4
Common
Miscellaneous	2		—		(1		)	—		—			1
Total liability	$	2,782	$	1	$	(30	)	$	136	$	(414	)	$	2,475

^(a)  Amounts settled related to asbestos abatement, closure of ash containment facilities, and removal and disposal of storage tanks and other above ground equipment.

^(b)  In 2017, AROs were revised for changes in timing and estimates of cash flows. Nuclear AROs decreased due to updated assumptions. Changes in gas transmission and distribution AROs were primarily related to increased labor costs.

Indeterminate AROs — Other plants or buildings may contain asbestos due to the age of many of Xcel Energy’s facilities, but no confirmation or measurement of the cost of removal could be determined as of Dec. 31, 2018. Therefore, an ARO was not recorded for these facilities.

Removal Costs — Xcel Energy records a regulatory liability for the plant removal costs of its utility subsidiaries that are recovered currently in rates. Removal costs have accumulated based on varying rates as authorized by the appropriate regulatory entities. The utility subsidiaries have estimated the amount of removal costs accumulated through historic depreciation expense based on current factors used in the existing depreciation rates.

Accumulated balances by entity at Dec. 31:

(Millions of Dollars)	2018		2017
NSP-Minnesota	$	485	$	442
PSCo	344		346
SPS	188		197
NSP-Wisconsin	158		146
Total Xcel Energy	$	1,175	$	1,131

Nuclear Related

Nuclear Insurance — NSP-Minnesota’s public liability for claims from any nuclear incident is limited to $14.1 billion under the Price-Anderson amendment to the Atomic Energy Act. NSP-Minnesota has secured $450 million of coverage for its public liability exposure with a pool of insurance companies. The remaining $13.6 billion of exposure is funded by the Secondary Financial Protection Program, available from assessments by the federal government.

NSP-Minnesota is subject to assessments of up to $138 million per reactor-incident for each of its three licensed reactors, for public liability arising from a nuclear incident at any licensed nuclear facility in the United States. The maximum funding requirement is $21 million per reactor-incident during any one year. Maximum assessments are subject to inflation adjustments by the NRC and state premium taxes. The NRC’s last adjustment was effective November 2018.

NSP-Minnesota purchases insurance for property damage and site decontamination cleanup costs from NEIL and EMANI. The coverage limits are $2.3 billion for each of NSP-Minnesota’s two nuclear plant sites. NEIL also provides business interruption insurance coverage, including the cost of replacement power during prolonged accidental outages of nuclear generating units. Premiums are expensed over the policy term.

All companies insured with NEIL are subject to retroactive premium adjustments if losses exceed accumulated reserve funds. Capital has been accumulated in the reserve funds of NEIL and EMANI to the extent that NSP-Minnesota would have no exposure for retroactive premium assessments in case of a single incident under the business interruption and the property damage insurance coverage. NSP-Minnesota could be subject to annual maximum assessments of approximately $18 million for business interruption insurance and $39 million for property damage insurance if losses exceed accumulated reserve funds.

Nuclear Fuel Disposal — NSP-Minnesota is responsible for temporarily storing spent nuclear fuel from its nuclear plants. The DOE is responsible for permanently storing spent fuel from U.S. nuclear plants, but no such facility is yet available.

NSP-Minnesota owns temporary on-site storage facilities for spent fuel at its Monticello and PI nuclear plants, which consist of storage pools and dry cask facilities. The Monticello dry-cask storage facility currently stores all 30 of the authorized canisters. The PI dry-cask storage facility currently stores 44 of the 64 authorized casks. Monticello’s future spent fuel will continue to be placed in its spent fuel pool. The decommissioning plan addresses the disposition of spent fuel at the end of the licensed life.

Regulatory Plant Decommissioning Recovery — Decommissioning activities for NSP-Minnesota’s nuclear facilities are planned to begin at the end of each unit’s operating license and be completed by 2091. NSP-Minnesota’s current operating licenses allow continued use of its Monticello nuclear plant until 2030 and its PI nuclear plant until 2033 for Unit 1 and 2034 for Unit 2.

Future decommissioning costs of nuclear facilities are estimated through triennial periodic studies that assess the costs and timing of planned nuclear decommissioning activities for each unit.

Obligation for decommissioning is expected to be funded 100% by the external decommissioning trust fund. This cost study assumes the external decommissioning fund will earn an after-tax return between 5.23% and 6.30% Realized and unrealized gains on fund investments are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Decommissioning costs are quantified in 2014 dollars. Escalation rates are 4.36% for plant removal activities and 3.36% for fuel management and site restoration activities.

NSP-Minnesota has accumulated $2.1 billion of assets held in external decommissioning trusts in 2018. The following table summarizes the funded status of NSP-Minnesota’s decommissioning obligation. Xcel Energy believes future decommissioning costs will continue to be recovered in customer rates. The following amounts were prepared on a regulatory basis and not directly recorded in the financial statements (ARO).

	Regulatory Basis
(Millions of Dollars)	2018			2017
Estimated decommissioning cost obligation from most recently approved study (in 2014 dollars)	$	3,012		$	3,012
Effect of escalating costs	539			396
Estimated decommissioning cost obligation (in current dollars)	3,551			3,408
Effect of escalating costs to payment date	7,654			7,797
Estimated future decommissioning costs (undiscounted)	11,205			11,205
Effect of discounting obligation (using average risk-free interest rate of 3.33% and 2.80% for 2018 and 2017, respectively)	(6,911		)	(6,398		)
Discounted decommissioning cost obligation	$	4,294		$	4,807
Assets held in external decommissioning trust	$	2,055		$	2,143
Underfunding of external decommissioning fund compared to the discounted decommissioning obligation	2,239			2,664

Calculations and data used by the regulator in approving NSP-Minnesota’s rates are useful in assessing future cash flows. Regulatory basis information is a means to reconcile amounts previously provided to the MPUC and utilized for regulatory purposes to amounts used for financial reporting.

Reconciliation of the discounted decommissioning cost obligation - regulated basis to the ARO recorded in accordance with GAAP:

(Millions of Dollars)	2018			2017
Discounted decommissioning cost obligation - regulated basis	$	4,294		$	4,807
Differences in discount rate and market risk premium	(1,447		)	(1,403		)
O&M costs not included for GAAP	(879		)	(1,041		)
ARO differences between 2017 and 2014 cost studies	—			(489		)
Nuclear production decommissioning ARO - GAAP	$	1,968		$	1,874

Decommissioning expenses recognized as a result of regulation:

(Millions of Dollars)	2018		2017		2016
Annual decommissioning recorded as depreciation expense: (a) (b)	$	20	$	20	$	20

^(a)  Decommissioning expense does not include depreciation of the capitalized nuclear asset retirement costs.

^(b)  Decommissioning expenses in 2018, 2017 and 2016 include Minnesota’s retail jurisdiction annual funding requirement of approximately $14 million.

The 2014 nuclear decommissioning filing, approved in 2015, was used for regulatory presentation in 2018, 2017 and 2016. The 2017 filing, effective Jan. 1, 2019, has been approved by the MPUC.

Leases — Xcel Energy has three leases accounted for as capital leases. The assets and liabilities of a capital lease are recorded at the lower of fair market value of the leased asset or the present value of future lease payments and are amortized over the term of the contract.

WYCO is a joint venture with CIG to develop and lease natural gas pipeline, storage and compression facilities. Xcel Energy Inc. has a 50% ownership interest in WYCO. WYCO leases its facilities to CIG, and CIG operates the facilities, providing natural gas storage and transportation services to PSCo under separate service agreements.

PSCo accounts for its Totem natural gas storage service arrangement with CIG as a capital lease. Xcel Energy Inc. eliminates 50% of the capital lease obligation related to WYCO in the consolidated balance sheet along with an equal amount of Xcel Energy Inc.’s equity investment in WYCO.

PSCo records amortization for its capital lease assets as electric fuel and purchased power and cost of natural gas sold and transported on the consolidated statements of income.

Property held under capital leases:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
Gas storage facilities	$	201		$	201
Gas pipeline	21			21
Property held under capital leases	222			222
Accumulated depreciation	(77		)	(71		)
Total property held under capital leases, net	$	145		$	151

Remaining leases, primarily for real estate and certain natural gas generating facilities operated under PPAs, as well as railcars, aircraft and other equipment, are accounted for as operating leases.

Total expenses (including capacity payments) under operating lease obligations for Xcel Energy and the corresponding capacity payments for PPAs accounted for as operating leases for the year ended Dec. 31:

(Millions of Dollars)	2018		2017		2016
Total expense	$	248	$	246	$	255
Capacity payments	210		210		216

Included in the future commitments under operating leases are estimated future capacity payments under PPAs that have been accounted for as operating leases.

Future commitments under operating and capital leases:

(Millions of Dollars)	Operating Leases		PPA (a) (b) Operating Leases		Total Operating Leases		Capital Leases
2019	$	32	$	207	$	239	$	14
2020	26		208		234		14
2021	25		210		235		14
2022	24		197		221		12
2023	22		186		208		12
Thereafter	154		883		1,037		220
Total minimum obligation							286
Interest component of obligation							(201		)
Present value of minimum obligation							$	85		(c)

^(a)  Amounts do not include PPAs accounted for as executory contracts.

^(b)  PPA operating leases contractually expire through 2034.

^(c)  Excludes certain amounts related to Xcel Energy’s 50% ownership interest in WYCO.

Non-Lease PPAs— NSP Minnesota, PSCo and SPS have entered into PPAs with other utilities and energy suppliers with expiration dates through 2039 for purchased power to meet system load and energy requirements, meet operating reserve obligations and as part of wholesale and commodity trading activities. In general, these agreements provide for energy payments, based on actual energy delivered and capacity payments. Certain PPAs accounted for as executory contracts contain minimum energy purchase commitments.

Capacity and energy payments are contingent on the IPPs meeting contract obligations, including plant availability requirements. Certain contractual payments are adjusted based on market indices. The effects of price adjustments on our financial results are mitigated through purchased energy cost recovery mechanisms.

Included in electric fuel and purchased power expenses for PPAs accounted for as executory contracts were payments for capacity of $131 million, $168 million and $191 million in 2018, 2017 and 2016, respectively.

At Dec. 31, 2018, the estimated future payments for capacity and energy that the utility subsidiaries of Xcel Energy are obligated to purchase pursuant to these executory contracts, subject to availability, were as follows:

(Millions of Dollars)	Capacity		Energy (a)
2019	$	86	$	99
2020	70		109
2021	78		157
2022	77		173
2023	79		177
Thereafter	125		328
Total	$	515	$	1,043

^(a)  Excludes contingent energy payments for renewable energy PPAs.

Fuel Contracts — Xcel Energy has entered into various long-term commitments for the purchase and delivery of a significant portion of its coal, nuclear fuel and natural gas requirements. These contracts expire between 2019 and 2060. Xcel Energy is required to pay additional amounts depending on actual quantities shipped under these agreements.

Estimated minimum purchases under these contracts as of Dec. 31, 2018:

(Millions of Dollars)	Coal		Nuclear fuel		Natural gas supply		Natural gas supply and transportation
2019	$	461	$	127	$	416	$	268
2020	260		51		263		255
2021	149		99		254		245
2022	109		79		114		234
2023	61		99		60		170
Thereafter	108		337		—		923
Total	$	1,148	$	792	$	1,107	$	2,095

VIEs

PPAs—Under certain PPAs, NSP-Minnesota, PSCo and SPS purchase power from IPPs for which the utility subsidiaries are required to reimburse fuel costs, or to participate in tolling arrangements under which the utility subsidiaries procure the natural gas required to produce the energy that they purchase. Xcel Energy has determined that certain IPPs are VIEs. Xcel Energy is not subject to risk of loss from the operations of these entities, and no significant financial support is required other than contractual payments for energy and capacity.

In addition, certain solar PPAs provide an option to purchase emission allowances or sharing provisions related to production credits generated by the solar facility under contract. These specific PPAs create a variable interest in the IPP.

Xcel Energy evaluated each of these VIEs for possible consolidation, including review of qualitative factors such as the length and terms of the contract, control over O&M, control over dispatch of electricity, historical and estimated future fuel and electricity prices, and financing activities.

Xcel Energy concluded that these entities are not required to be consolidated in its consolidated financial statements because it does not have the power to direct the activities that most significantly impact the entities’ economic performance. Xcel Energy’s utility subsidiaries had approximately 3,770 MW and 3,537 MW of capacity under long-term PPAs at Dec. 31, 2018 and 2017, respectively, with entities that have been determined to be VIEs. Agreements have expiration dates through 2041.

Fuel Contracts — SPS purchases all of its coal requirements for its Harrington and Tolk plants from TUCO under contracts that will expire in December 2022. TUCO arranges for the purchase, receiving, transporting, unloading, handling, crushing, weighing and delivery of coal to meet SPS’ requirements. TUCO is responsible for negotiating and administering contracts with coal suppliers, transporters and handlers.

SPS has not provided any significant financial support to TUCO, other than contractual payments for delivered coal. However, the fuel contracts create a variable interest in TUCO due to SPS’ reimbursement of fuel procurement costs. SPS has determined that TUCO is a VIE. SPS has concluded that it is not the primary beneficiary of TUCO because SPS does not have the power to direct the activities that most significantly impact TUCO’s economic performance.

Low-Income Housing Limited Partnerships — Eloigne and NSP-Wisconsin have entered into limited partnerships for the construction and operation of affordable rental housing developments which qualify for low-income housing tax credits. Xcel Energy Inc. has determined Eloigne and NSP-Wisconsin’s low-income housing partnerships to be VIEs primarily due to contractual arrangements within each limited partnership that establish sharing of ongoing voting control and profits and losses that does not align with the partners’ proportional equity ownership. Eloigne and NSP-Wisconsin have the power to direct the activities that most significantly impact these entities’ economic performance. Therefore, Xcel Energy Inc. consolidates these limited partnerships in its consolidated financial statements. Xcel Energy’s risk of loss for these partnerships is limited to its capital contributions, adjusted for any distributions and its share of undistributed profits and losses; no significant additional financial support has been, or is required to be provided to the limited partnerships by Eloigne or NSP-Wisconsin.

Amounts reflected in Xcel Energy’s consolidated balance sheets for the Eloigne and NSP-Wisconsin low-income housing limited partnerships:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Current assets	$	5	$	6
Property, plant and equipment, net	42		46
Other noncurrent assets	1		1
Total assets	$	48	$	53
Current liabilities	$	7	$	9
Mortgages and other long-term debt payable	26		26
Other noncurrent liabilities	—		1
Total liabilities	$	33	$	36

Other

Technology Agreements — Xcel Energy has a contract that extends through December 2022 with IBM for information technology services. Contract is cancelable at Xcel Energy’s option, although Xcel Energy would be obligated to pay 50% of the contract value for early termination. Xcel Energy capitalized or expensed $81 million, $98 million and $119 million associated with the IBM contract in 2018, 2017 and 2016, respectively.

Xcel Energy’s contract with Accenture for information technology services extends through December 2020. Contract is cancelable at Xcel Energy’s option, although there are financial penalties for early termination. Xcel Energy capitalized or expensed $46 million, $16 million and $35 million associated with the Accenture contract in 2018, 2017 and 2016, respectively.

Committed minimum payments under these obligations:

(Millions of Dollars)	IBM Agreement		Accenture Agreement
2019	$	30	$	11
2020	16		11
2021	16		—
2022	7		—
2023	—		—
Thereafter	—		—

Guarantees and Bond Indemnifications —Xcel Energy Inc. and its subsidiaries enter into contractual guarantees in limited circumstances. Xcel Energy Inc. may guarantee the subsidiaries’ obligations in the event they fail to perform and may provide guarantees in certain indemnification agreements. Xcel Energy Inc.’s guarantees from the subsidiaries are not individually material with maximum potential liability totaling $6 million as of Dec. 31, 2018. Payment for these guarantees is considered remote.

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Other Comprehensive Income

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Comprehensive Income (Loss) Note [Text Block]

13.    Other Comprehensive Income

Changes in accumulated other comprehensive (loss), net of tax, for the years ended Dec. 31:

	2018
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges				Defined Benefit Pension and Postretirement Items				Total
Accumulated other comprehensive loss at Jan. 1	$	(58	)		$	(67	)		$	(125	)
Other comprehensive loss before reclassifications (net of taxes of $(2) and $(2), respectively)	(5		)		(6		)		(11		)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $1 and $0, respectively)	3			(a)	—				3
Amortization of net actuarial loss (net of taxes of $0 and $3, respectively)	—				9			(b)	9
Net current period other comprehensive income (loss)	(2		)		3				1
Accumulated other comprehensive loss at Dec. 31	$	(60	)		$	(64	)		$	(124	)

	2017
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges				Defined Benefit Pension and Postretirement Items				Total
Accumulated other comprehensive loss at Jan. 1	$	(51	)		$	(59	)		$	(110	)
Other comprehensive loss before reclassifications (net of taxes of $0 and $(2), respectively)	—				(3		)		(3		)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $2 and $0, respectively)	3			(a)	—				3
Amortization of net actuarial loss (net of taxes of $0 and $5, respectively)	—				7			(b)	$	7
Net current period other comprehensive income	3				4				7
Adoption of ASU No. 2018-02 (c)	(10		)		(12		)		(22		)
Accumulated other comprehensive loss at Dec. 31	$	(58	)		$	(67	)		$	(125	)

^(a)  Included in interest charges.

^(b)  Included in the computation of net periodic pension and postretirement benefit costs.

^(c)  In 2017, Xcel Energy implemented ASU No. 2018-02 related to the TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.

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Segments and Related Information

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Segment Information

14.    Segments and Related Information

Regulated electric utility operating results of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS, as well as the regulated natural gas utility operating results of NSP-Minnesota, NSP-Wisconsin and PSCo are each separately and regularly reviewed by Xcel Energy’s chief operating decision maker. Xcel Energy evaluates performance by each utility subsidiary based on profit or loss generated from the product or service provided. These segments are managed separately because the revenue streams are dependent upon regulated rate recovery, which is separately determined for each segment.

Xcel Energy has the following reportable segments:

• Regulated Electric - The regulated electric utility segment generates, transmits and distributes electricity in Minnesota, Wisconsin, Michigan, North Dakota, South Dakota, Colorado, Texas and New Mexico. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. The regulated electric utility segment also includes wholesale commodity and trading operations.

• Regulated Natural Gas - The regulated natural gas utility segment transports, stores and distributes natural gas primarily in portions of Minnesota, Wisconsin, North Dakota, Michigan and Colorado.

• All Other - Operating segments with revenues below the necessary quantitative thresholds are included in this category. Those segments primarily include steam revenue, appliance repair services, non-utility real estate activities, revenues associated with processing solid waste into refuse-derived fuel and investments in rental housing projects that qualify for low-income housing tax credits.

Xcel Energy had equity investments in unconsolidated subsidiaries of $141 million and $140 million as of Dec. 31, 2018 and 2017, respectively, included in the natural gas utility and all other segments.

Asset and capital expenditure information is not provided for Xcel Energy’s reportable segments. As an integrated electric and natural gas utility, Xcel Energy operates significant assets that are not dedicated to a specific business segment. Reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.

Certain costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators across each segment. In addition, a general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

Xcel Energy’s segment information:

(Millions of Dollars)	2018			2017			2016
Regulated Electric
Operating revenues from external customers	$	9,719		$	9,676		$	9,500
Intersegment revenue	1			2			1
Total revenues	$	9,720		$	9,678		$	9,501
Depreciation and amortization	1,421			1,298			1,136
Interest charges and financing costs	449			449			450
Income tax expense	187			528			567
Net income	1,177			1,066			1,067
Regulated Natural Gas
Operating revenues from external customers	$	1,739		$	1,650		$	1,531
Intersegment revenue	2			1			1
Total revenues	$	1,741		$	1,651		$	1,532
Depreciation and amortization	212			174			160
Interest charges and financing costs	61			57			54
Income tax expense	28			23			76
Net income	187			182			124
All Other
Total operating revenue	$	79		$	78		$	76
Depreciation and amortization	9			7			7
Interest charges and financing costs	142			122			116
Income tax (benefit)	(34		)	(9		)	(62		)
Net (loss)	(103		)	(100		)	(68		)
Consolidated Total
Total revenue	$	11,540		$	11,407		$	11,109
Reconciling eliminations	(3		)	(3		)	(2		)
Consolidated total revenue	$	11,537		$	11,404		$	11,107
Depreciation and amortization	1,642			1,479			1,303
Interest charges and financing costs	652			628			620
Income tax expense	181			542			581
Net income	1,261			1,148			1,123

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Summarized Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

Summarized Quarterly Financial Data (Unaudited)

	Quarter Ended
(Amounts in millions, except per share data)	March 31, 2018		June 30, 2018		Sept. 30, 2018		Dec. 31, 2018
Operating revenues	$	2,951	$	2,658	$	3,048	$	2,880
Operating income (a)	480		450		696		339
Net income	291		265		491		214
EPS total — basic	$	0.57	$	0.52	$	0.96	$	0.42
EPS total — diluted	0.57		0.52		0.96		0.42
Cash dividends declared per common share	0.38		0.38		0.38		0.38

	Quarter Ended
(Amounts in millions, except per share data)	March 31, 2017		June 30, 2017		Sept. 30, 2017		Dec. 31, 2017
Operating revenues	$	2,946	$	2,645	$	3,017	$	2,796
Operating income (a)	492		466		824		440
Net income	239		227		492		189
EPS total — basic	$	0.47	$	0.45	$	0.97	$	0.37
EPS total — diluted	0.47		0.45		0.97		0.37
Cash dividends declared per common share	0.36		0.36		0.36		0.36

^(a)  In 2018, Xcel Energy implemented ASU No. 2017-07 related to net periodic benefit cost, which resulted in retrospective reclassification of pension costs from O&M expense to other income.

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Schedule I, Condensed Financial Statements of Xcel Energy Inc

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Schedule I, Condensed Financial Information

XCEL ENERGY INC. CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (amounts in millions, except per share data)
	Year Ended Dec. 31
	2018			2017			2016
Income
Equity earnings of subsidiaries	$	1,393		$	1,263		$	1,199
Total income	1,393			1,263			1,199
Expenses and other deductions
Operating expenses	24			30			22
Other income	(1		)	(6		)	(3		)
Interest charges and financing costs	149			128			116
Total expenses and other deductions	172			152			135
Income before income taxes	1,221			1,111			1,064
Income tax benefit	(40		)	(37		)	(59		)
Net income	$	1,261		$	1,148		$	1,123
Other Comprehensive Income
Pension and retiree medical benefits, net of tax of $1, $3 and $(3) respectively	$	3		$	4		$	(4	)
Derivative instruments, net of tax of $(1), $2 and $2, respectively	(2		)	3			4
Other comprehensive income (loss)	1			7			—
Comprehensive income	$	1,262		$	1,155		$	1,123
Weighted average common shares outstanding:
Basic	511			509			509
Diluted	511			509			509
Earnings per average common share:
Basic	$	2.47		$	2.26		$	2.21
Diluted	2.47			2.25			2.21
See Notes to Condensed Financial Statements

XCEL ENERGY INC. CONDENSED STATEMENTS OF CASH FLOWS (amounts in millions)
	Year Ended Dec. 31
	2018			2017			2016
Operating activities
Net cash provided by operating activities	$	1,210		$	1,208		$	817
Investing activities
Capital contributions to subsidiaries	(809		)	(849		)	(414		)
Investments in the utility money pool	(2,578		)	(1,258		)	(1,880		)
Return of investments in the utility money pool	2,493			1,173			1,880
Net cash used in investing activities	(894		)	(934		)	(414		)
Financing activities
Proceeds from (repayment of) short-term borrowings, net	(295		)	715			(516		)
Proceeds from issuance of long-term debt	492			—			1,539
Repayment of long-term debt	—			(250		)	(704		)
Proceeds from issuance of common stock	230			—			—
Repurchase of common stock	(1		)	(3		)	(32		)
Dividends paid	(730		)	(721		)	(681		)
Other	(12		)	(14		)	(9		)
Net cash (used in) provided by financing activities	(316		)	(273		)	(403		)
Net change in cash and cash equivalents	—			1			—
Cash and cash equivalents at beginning of period	1			—			—
Cash and cash equivalents at end of period	$	1		$	1		$	—
See Notes to Condensed Financial Statements

XCEL ENERGY INC. CONDENSED BALANCE SHEETS (amounts in millions)
	Dec. 31
	2018		2017
Assets
Cash and cash equivalents	$	1	$	1
Accounts receivable from subsidiaries	309		302
Other current assets	1		1
Total current assets	311		304
Investment in subsidiaries	15,965		14,932
Other assets	44		103
Total other assets	16,009		15,035
Total assets	$	16,320	$	15,339
Liabilities and Equity
Current portion of long-term debt	$	—	$	—
Dividends payable	195		183
Short-term debt	488		783
Other current liabilities	10		11
Total current liabilities	693		977
Other liabilities	32		29
Total other liabilities	32		29
Commitments and contingencies
Capitalization
Long-term debt	3,373		2,878
Common stockholders’ equity	12,222		11,455
Total capitalization	15,595		14,333
Total liabilities and equity	$	16,320	$	15,339
See Notes to Condensed Financial Statements

NOTES TO CONDENSED FINANCIAL STATEMENTS

Incorporated by reference are Xcel Energy’s consolidated statements of common stockholders’ equity and other comprehensive income in Part II, Item 8.

Basis of Presentation — The condensed financial information of Xcel Energy Inc. is presented to comply with Rule 12-04 of Regulation S-X. Xcel Energy Inc.’s investments in subsidiaries are presented under the equity method of accounting. Under this method, the assets and liabilities of subsidiaries are not consolidated. The investments in net assets of the subsidiaries are recorded in the balance sheets. The income from operations of the subsidiaries is reported on a net basis as equity in income of subsidiaries.

As a holding company with no business operations, Xcel Energy Inc.’s assets consist primarily of investments in its utility subsidiaries. Xcel Energy Inc.’s material cash inflows are only from dividends and other payments received from its utility subsidiaries and the proceeds raised from the sale of debt and equity securities. The ability of its utility subsidiaries to make dividend and other payments is subject to the availability of funds after taking into account their respective funding requirements, the terms of their respective indebtedness, the regulations of the FERC under the Federal Power Act, and applicable state laws. Management does not expect maintaining these requirements to have an impact on Xcel Energy Inc.’s ability to pay dividends at the current level in the foreseeable future. Each of its utility subsidiaries, however, is legally distinct and has no obligation, contingent or otherwise, to make funds available to Xcel Energy Inc.

Guarantees and Indemnifications

Xcel Energy Inc. provides guarantees and bond indemnities under specified agreements or transactions, which guarantee payment or performance. Xcel Energy Inc.’s exposure is based upon the net liability of the relevant subsidiary under the specified agreements or transactions. Most of the guarantees and bond indemnities issued by Xcel Energy Inc. limit the exposure to a maximum stated amount. As of Dec. 31, 2018 and 2017, Xcel Energy Inc. had no assets held as collateral related to guarantees, bond indemnities and indemnification agreements.

Guarantees and bond indemnities issued and outstanding as of Dec. 31, 2018:

(Millions of Dollars)	Guarantor	Guarantee Amount		Current Exposure		Triggering Event
Guarantee of the indemnification obligations of Xcel Energy Services Inc. under the aircraft leases (a)	Xcel Energy Inc.	$	11.0	$	—	(d)
Guarantee of loan for Hiawatha Collegiate High School (b)	Xcel Energy Inc.	1.0		—		(d)
Total guarantees issued		12.0		$	—
Guarantee performance and payment of surety bonds for Xcel Energy Inc.’s utility subsidiaries (c)	Xcel Energy Inc.	$	51.1	(f)		(e)

^(a)  The terms of this guarantee expires in 2021 and 2023 when the associated leases expire.

^(b)  The term of this guarantee expires the earlier of 2024 or full repayment of the loan.

^(c)  The surety bonds primarily relate to workers compensation benefits and utility projects. The workers compensation bonds are renewed annually and the project based bonds expire in conjunction with the completion of the related projects.

^(d)  Nonperformance and/or nonpayment.

^(e)  Per the indemnity agreement between Xcel Energy Inc. and the various surety companies, surety companies have the discretion to demand that collateral be posted.

^(f)  Due to the magnitude of projects associated with the surety bonds, the total current exposure of this indemnification cannot be determined. Xcel Energy Inc. believes the exposure to be significantly less than the total amount of the outstanding bonds.

Indemnification Agreements

Xcel Energy Inc. provides indemnifications through contracts entered into in the normal course of business. Indemnifications are primarily against adverse litigation outcomes in connection with underwriting agreements, breaches of representations and warranties, including corporate existence, transaction authorization and certain income tax matters. Obligations under these agreements may be limited in terms of duration or amount. Maximum future payments under these indemnifications cannot be reasonably estimated as the dollar amounts are often not explicitly stated.

Related Party Transactions — Xcel Energy Inc. presents related party receivables net of payables. Accounts receivable and payable with affiliates at Dec. 31:

	2018				2017
(Millions of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	117	$	—	$	68	$	—
NSP-Wisconsin	3		—		13		—
PSCo	29		—		69		—
SPS	39		—		26		—
Xcel Energy Services Inc.	96		—		95		—
Xcel Energy Ventures Inc.	13		—		14		—
Other subsidiaries of Xcel Energy Inc.	12		—		17		—
	$	309	$	—	$	302	$	—

Dividends — Cash dividends paid to Xcel Energy Inc. by its subsidiaries were $1,097 million, $1,063 million and $923 million for the years ended Dec. 31, 2018, 2017 and 2016, respectively. These cash receipts are included in operating cash flows of the condensed statements of cash flows.

Money Pool— FERC approval was received to establish a utility money pool arrangement with the utility subsidiaries, subject to receipt of required state regulatory approvals. The utility money pool allows for short-term investments in and borrowings between the utility subsidiaries. Xcel Energy Inc. may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy Inc.

Money pool lending for Xcel Energy Inc.:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Dec. 31, 2018
Loan outstanding at period end	$	—
Average loan outstanding	59
Maximum loan outstanding	172
Weighted average interest rate, computed on a daily basis	2.22		%
Weighted average interest rate at end of period	N/A
Money pool interest income	$	0.3

(Amounts in Millions, Except Interest Rates)	Year Ended Dec. 31, 2018			Year Ended Dec. 31, 2017			Year Ended Dec. 31, 2016
Loan outstanding at period end	$	—		$	85		$	—
Average loan outstanding	71			38			66
Maximum loan outstanding	243			226			211
Weighted average interest rate, computed on a daily basis	1.95		%	1.13		%	0.69		%
Weighted average interest rate at end of period	N/A			1.18			N/A
Money pool interest income	$	1.4		$	0.4		$	0.5

See notes to the consolidated financial statements in Part II, Item 8.

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Schedule II, Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II, Valuation and Qualifying Accounts

XCEL ENERGY INC. AND SUBSIDIARIES VALUATION AND QUALIFYING ACCOUNTS YEARS ENDED DEC. 31

	Allowance for bad debts									NOL and tax credit valuation allowances
(Millions of Dollars)	2018			2017			2016			2018				2017				2016
Balance at Jan. 1	$	52		$	51		$	52		$	77			$	58			$	28
Additions Charged to Costs and Expenses	42			39			39			7				9				3
Additions Charged to Other Accounts	11			10			11			—			(a)	22			(a)	35			(a)
Deductions from Reserves	(50		)	(48		)	(51		)	(5		)	(b)	(12		)	(b)	(8		)	(b)
Balance at Dec. 31	$	55		$	52		$	51		$	79			$	77			$	58

^(a)  The 2016 - 2017 changes are the accrual of valuation allowances for North Dakota ITC, net of federal income tax benefit, that is offset to a regulatory liability; the 2017 change includes $14 million expense related to the revaluation of federal benefit as a result of the TCJA.

^(b)  Primarily the reductions to valuation allowances for North Dakota ITC carryforwards, net of federal benefit, primarily due to a consolidated adjustment to the regulatory liability accrual referenced above; the 2017 change includes $4 million of reduced expense related to the revaluation of federal benefit as a result of TCJA.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Business and System of Accounts

General — Xcel Energy Inc.’s utility subsidiaries are engaged in the regulated generation, purchase, transmission, distribution and sale of electricity and in the regulated purchase, transportation, distribution and sale of natural gas.

Xcel Energy’s consolidated financial statements are presented in accordance with GAAP. All of the utility subsidiaries’ underlying accounting records also conform to the FERC uniform system of accounts.

Principles of Consolidation

Xcel Energy’s regulated operations include the activities of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS. These utility subsidiaries serve electric and natural gas customers in portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. Also included in regulated operations are WGI, an interstate natural gas pipeline company, and WYCO, a joint venture with CIG to develop and lease natural gas pipeline, storage and compression facilities.

Xcel Energy Inc.’s nonregulated subsidiaries include Eloigne and Capital Services. Eloigne invests in rental housing projects that qualify for low-income housing tax credits. Capital Services procures equipment for construction of renewable generation facilities at other subsidiaries. Xcel Energy Inc. owns the following additional direct subsidiaries, some of which are intermediate holding companies with additional subsidiaries: Xcel Energy Wholesale Group Inc., Xcel Energy Markets Holdings Inc., Xcel Energy Ventures Inc., Xcel Energy Retail Holdings Inc., Xcel Energy Communications Group, Inc., Xcel Energy International Inc., Xcel Energy Transmission Holding Company, LLC, Nicollet Holdings Company, LLC, Nicollet Project Holdings LLC and Xcel Energy Services Inc. Xcel Energy Inc. and its subsidiaries collectively are referred to as Xcel Energy.

Xcel Energy’s consolidated financial statements include its wholly-owned subsidiaries and VIEs for which it is the primary beneficiary. All intercompany transactions and balances are eliminated, unless a different treatment is appropriate for rate regulated transactions.

Xcel Energy uses the equity method of accounting for its investment in WYCO. Xcel Energy’s equity earnings in WYCO are included on the consolidated statements of income as equity earnings of unconsolidated subsidiaries.

Xcel Energy has investments in certain plants and transmission facilities jointly owned with nonaffiliated utilities. Xcel Energy’s proportionate share of jointly owned facilities is recorded as property, plant and equipment on the consolidated balance sheets, and Xcel Energy’s proportionate share of the operating costs associated with these facilities is included in its consolidated statements of income. See Note 3 for further information.

Subsequent Events

Xcel Energy has evaluated events occurring after Dec. 31, 2018 up to the date of issuance of these consolidated financial statements. Statements contain all necessary adjustments and disclosures resulting from that evaluation.

Use of Estimates

Use of Estimates — Xcel Energy uses estimates based on the best information available in recording transactions and balances resulting from business operations. Estimates are used on items such as plant depreciable lives or potential disallowances, AROs, certain regulatory assets and liabilities, tax provisions, uncollectible amounts, environmental costs, unbilled revenues, jurisdictional fuel and energy cost allocations and actuarially determined benefit costs. Recorded estimates are revised when better information becomes available or actual amounts can be determined. Revisions can affect operating results.

Regulatory Accounting

Regulatory Accounting — Xcel Energy Inc.’s regulated utility subsidiaries account for income and expense items in accordance with accounting guidance for regulated operations. Under this guidance:

• Certain costs, which would otherwise be charged to expense or other comprehensive income, are deferred as regulatory assets based on the expected ability to recover the costs in future rates.

• Certain credits, which would otherwise be reflected as income or other comprehensive income, are deferred as regulatory liabilities based on the expectation the amounts will be returned to customers in future rates, or because the amounts were collected in rates prior to the costs being incurred.

Estimates of recovering deferred costs and returning deferred credits are based on specific ratemaking decisions or precedent for each item. Regulatory assets and liabilities are amortized consistent with the treatment in the rate setting process.

If changes in the regulatory environment occur, the utility subsidiaries may no longer be eligible to apply this accounting treatment, and may be required to eliminate regulatory assets and liabilities from their balance sheets. Such changes could have a material effect on Xcel Energy’s results of operations, financial condition or cash flows.

See Note 4 for further information.

Income Taxes

Income Taxes — Xcel Energy accounts for income taxes using the asset and liability method, which requires deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Xcel Energy defers income taxes for all temporary differences between pretax financial and taxable income, and between the book and tax bases of assets and liabilities. Xcel Energy uses the tax rates that are scheduled to be in effect when the temporary differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in the period that includes the enactment date.

The effects of tax rate changes that are attributable to the utility subsidiaries are generally subject to a normalization method of accounting. Therefore, the revaluation of most of the utility subsidiaries’ net deferred taxes upon a tax rate reduction results in the establishment of a net regulatory liability which will be refundable to utility customers over the remaining life of the related assets. A tax rate increase would result in the establishment of a similar regulatory asset.

Reversal of certain temporary differences are accounted for as current income tax expense due to the effects of past regulatory practices when deferred taxes were not required to be recorded due to the use of flow through accounting for ratemaking purposes. Tax credits are recorded when earned unless there is a requirement to defer the benefit and amortize it over the book depreciable lives of the related property. The requirement to defer and amortize tax credits only applies to federal ITCs related to public utility property. Utility rate regulation also has resulted in the recognition of regulatory assets and liabilities related to income taxes.

Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax asset will not be realized.

Xcel Energy follows the applicable accounting guidance to measure and disclose uncertain tax positions that it has taken or expects to take in its income tax returns. Xcel Energy recognizes a tax position in its consolidated financial statements when it is more likely than not that the position will be sustained upon examination based on the technical merits of the position.

Recognition of changes in uncertain tax positions are reflected as a component of income tax.

Xcel Energy reports interest and penalties related to income taxes within the other income and interest charges in the consolidated statements of income.

Xcel Energy Inc. and its subsidiaries file consolidated federal income tax returns as well as consolidated or separate state income tax returns. Federal income taxes paid by Xcel Energy Inc. are allocated to its subsidiaries based on separate company computations. A similar allocation is made for state income taxes paid by Xcel Energy Inc. in connection with consolidated state filings. Xcel Energy Inc. also allocates its own income tax benefits to its direct subsidiaries.

See Note 7 for further information.

Property, Plant and Equipment and Depreciation

Property, Plant and Equipment and Depreciation — Property, plant and equipment is stated at original cost. The cost of plant includes direct labor and materials, contracted work, overhead costs and AFUDC. The cost of plant retired is charged to accumulated depreciation and amortization. Amounts recovered in rates for future removal costs are recorded as regulatory liabilities. Significant additions or improvements extending asset lives are capitalized, while repairs and maintenance costs are charged to expense as incurred. Maintenance and replacement of items determined to be less than a unit of property are charged to operating expenses as incurred. Planned maintenance activities are charged to operating expense unless the cost represents the acquisition of an additional unit of property or the replacement of an existing unit of property.

Property, plant and equipment is tested for impairment when it is determined that the carrying value of the assets may not be recoverable. A loss is recognized in the current period if it becomes probable that part of a cost of a plant under construction or recently completed plant will be disallowed for recovery from customers and a reasonable estimate of the disallowance can be made. For investments in property, plant and equipment that are abandoned and not expected to go into service, incurred costs and related deferred tax amounts are compared to the discounted estimated future rate recovery, and a loss is recognized, if necessary.

Xcel Energy records depreciation expense using the straight-line method over the plant’s useful life. Actuarial life studies are performed and submitted to the state and federal commissions for review. Upon acceptance by the various commissions, the resulting lives and net salvage rates are used to calculate depreciation. Depreciation expense, expressed as a percentage of average depreciable property, was approximately 3.1% for 2018, 3.1% for 2017 and 2.9% for 2016.

See Note 3 for further information.

Asset Retirement Obligations

AROs—Xcel Energy Inc.’s utility subsidiaries account for AROs under accounting guidance that requires a liability for the fair value of an ARO to be recognized in the period in which it is incurred if it can be reasonably estimated, with the offsetting associated asset retirement costs capitalized as a long-lived asset. The liability is generally increased over time by applying the effective interest method of accretion, and the capitalized costs are depreciated over the useful life of the long-lived asset. Changes resulting from revisions to the timing or amount of expected asset retirement cash flows are recognized as an increase or a decrease in the ARO. Xcel Energy Inc.’s utility subsidiaries also recover through rates certain future plant removal costs in addition to AROs. The accumulated removal costs for these obligations are reflected in the balance sheets as a regulatory liability.

See Note 12 for further information.

Nuclear Decommissioning

Nuclear Decommissioning — Nuclear decommissioning studies that estimate NSP-Minnesota’s ultimate costs of decommissioning its nuclear power plants are performed at least every three years and submitted to the state commissions for approval.

For ratemaking purposes, NSP-Minnesota recovers the decommissioning costs of its nuclear power plants over each facility’s expected service life based on the triennial decommissioning studies. The studies consider estimated future costs of decommissioning and the market value of investments in trust funds, and recommend annual funding amounts. Amounts collected in rates are deposited in the trust funds. For financial reporting purposes, NSP-Minnesota accounts for nuclear decommissioning as an ARO.

Restricted funds for the payment of future decommissioning expenditures for NSP-Minnesota’s nuclear facilities are included in nuclear decommissioning fund and other assets on the consolidated balance sheets.

See Note 10 for further information.

Benefit Plans and Other Postretirement Benefits

Benefit Plans and Other Postretirement Benefits — Xcel Energy maintains pension and postretirement benefit plans for eligible employees. Recognizing the cost of providing benefits and measuring the projected benefit obligation of these plans requires management to make various assumptions and estimates.

Certain unrecognized actuarial gains and losses and unrecognized prior service costs or credits are deferred as regulatory assets and liabilities, rather than recorded as other comprehensive income, based on regulatory recovery mechanisms.

See Note 11 for further information.

Environmental Costs

Environmental Costs — Environmental costs are recorded when it is probable Xcel Energy is liable for remediation costs and the liability can be reasonably estimated. Costs are deferred as a regulatory asset if it is probable that the costs will be recovered from customers in future rates. Otherwise, the costs are expensed. If an environmental expense is related to facilities currently in use, such as emission-control equipment, the cost is capitalized and depreciated over the life of the plant.

Estimated remediation costs are regularly adjusted as estimates are revised and remediation proceeds. If other participating PRPs exist and acknowledge their potential involvement with a site, costs are estimated and recorded only for Xcel Energy’s expected share of the cost.

Future costs of restoring sites are treated as a capitalized cost of plant retirement. The depreciation expense levels recoverable in rates include a provision for removal expenses. Removal costs recovered in rates before the related costs are incurred are classified as a regulatory liability.

See Note 12 for further information.

Revenue From Contracts With Customers

Revenue From Contracts With Customers — Performance obligations related to the sale of energy are satisfied as energy is delivered to customers. Xcel Energy recognizes revenue that corresponds to the price of the energy delivered to the customer. The measurement of energy sales to customers is generally based on the reading of their meters, which occurs on a systematic basis throughout the month. At the end of each month, amounts of energy delivered to customers since the date of the last meter reading are estimated, and the corresponding unbilled revenue is recognized.

Xcel Energy does not recognize a separate financing component of its collections from customers as contract terms are short-term in nature. Xcel Energy presents its revenues net of any excise or sales taxes or fees.

Xcel Energy’s utility subsidiaries recognize sales to customers on a gross basis in electric revenues and cost of sales. Revenues and charges for short term wholesale sales of excess energy transacted through RTOs are also recorded on a gross basis. Other RTO revenues and charges are recorded on a net basis in cost of sales.

See Note 6 for further information.

Cash and Cash Equivalents

Cash and Cash Equivalents — Xcel Energy considers investments in instruments with a remaining maturity of three months or less at the time of purchase, to be cash equivalents.

Accounts Receivable and Allowance for Bad Debts

Accounts Receivable and Allowance for Bad Debts — Accounts receivable are stated at the actual billed amount net of an allowance for bad debts. Xcel Energy establishes an allowance for uncollectible receivables based on a policy that reflects its expected exposure to the credit risk of customers. As of Dec. 31, 2018 and 2017, the allowance for bad debts was $55 million and $52 million, respectively.

Inventory

Inventory — Inventory is recorded at average cost and consisted of the following:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Inventories
Materials and supplies	$	271	$	311
Fuel	170		186
Natural gas	107		113
	$	548	$	610

Fair Value Measurements

Fair Value Measurements — Xcel Energy presents cash equivalents, interest rate derivatives, commodity derivatives and nuclear decommissioning fund assets at estimated fair values in its consolidated financial statements. Cash equivalents are recorded at cost plus accrued interest; money market funds are measured using quoted NAVs. For interest rate derivatives, quoted prices based primarily on observable market interest rate curves are used to establish fair value. For commodity derivatives, the most observable inputs available are generally used to determine the fair value of each contract. In the absence of a quoted price, Xcel Energy may use quoted prices for similar contracts or internally prepared valuation models to determine fair value.

For the pension and postretirement plan assets and nuclear decommissioning fund, published trading data and pricing models, generally using the most observable inputs available, are utilized to estimate fair value for each security.

See Notes 10 and 11 for further information.

Derivative Instruments

Derivative Instruments — Xcel Energy uses derivative instruments in connection with its interest rate, utility commodity price, vehicle fuel price and commodity trading activities, including forward contracts, futures, swaps and options. Any derivative instruments not qualifying for the normal purchases and normal sales exception are recorded on the consolidated balance sheets at fair value as derivative instruments. Classification of changes in fair value for those derivative instruments is dependent on the designation of a qualifying hedging relationship. Changes in fair value of derivative instruments not designated in a qualifying hedging relationship are reflected in current earnings or as a regulatory asset or liability. Classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms.

Gains or losses on commodity trading transactions are recorded as a component of electric operating revenues; hedging transactions for vehicle fuel costs are recorded as a component of capital projects and O&M costs; and interest rate hedging transactions are recorded as a component of interest expense.

Normal Purchases and Normal Sales — Xcel Energy enters into contracts for purchases and sales of commodities for use in its operations. At inception, contracts are evaluated to determine whether a derivative exists and/or whether an instrument may be exempted from derivative accounting if designated as a normal purchase or normal sale.

See Note 10 for further information.

Commodity Trading Operations

Commodity Trading Operations — All applicable gains and losses related to commodity trading activities are shown on a net basis in electric operating revenues in the consolidated statements of income.

Commodity trading activities are not associated with energy produced from Xcel Energy’s generation assets or energy and capacity purchased to serve native load. Commodity trading contracts are recorded at fair market value and commodity trading results include the impact of all margin-sharing mechanisms.

See Note 10 for further information.

AFUDC

AFUDC — AFUDC represents the cost of capital used to finance utility construction activity. AFUDC is computed by applying a composite financing rate to qualified CWIP. The amount of AFUDC capitalized as a utility construction cost is credited to other nonoperating income (for equity capital) and interest charges (for debt capital). AFUDC amounts capitalized are included in Xcel Energy’s rate base for establishing utility rates.

Alternative Revenue Programs

Alternative Revenue — Certain rate rider mechanisms (including decoupling and CIP/DSM programs) qualify as alternative revenue programs under GAAP. These mechanisms arise from costs imposed upon the utility by action of a regulator or legislative body related to an environmental, public safety or other mandate. When certain criteria are met, such as collection within 24 months, revenue is recognized equal to the revenue requirement, which may include incentives and return on rate base items. Billing amounts are revised periodically for differences between total amount collected and revenue earned, which may increase or decrease the level of revenue collected from customers. Alternative revenues arising from these programs are presented on a gross basis and disclosed separately from revenue from contracts with customers.

See Note 6 for further information.

Conservation Programs —Costs incurred for DSM and CIP programs are deferred if it is probable future revenue will recover the incurred cost. Revenues recognized for incentive programs for the recovery of lost margins and/or conservation performance incentives are limited to amounts expected to be collected within 24 months from when they are earned. Regulatory assets are recognized to reflect the amount of costs or earned incentives that have not yet been collected from customers.

Emission Allowances

Emission Allowances — Emission allowances are recorded at cost plus broker commission fees. The inventory accounting model is utilized for all emission allowances and sales of these allowances are included in electric revenues.

Nuclear refueling outage costs

Nuclear Refueling Outage Costs — Xcel Energy uses a deferral and amortization method for nuclear refueling costs. This method amortizes refueling outage costs over the period between refueling outages consistent with rate recovery.

Renewable Energy Credits

RECs — Cost of RECs that are utilized for compliance is recorded as electric fuel and purchased power expense. In certain jurisdictions, Xcel Energy reduces recoverable fuel costs for the cost of RECs and records that cost as a regulatory asset when the amount is recoverable in future rates.

Sales of RECs are recorded in electric revenues on a gross basis. The cost of these RECs and amounts credited to customers under margin-sharing mechanisms are recorded in electric fuel and purchased power expense.

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Balance Sheet Related Disclosures [Abstract]

Public Utilities, Inventory

Inventory is recorded at average cost and consisted of the following:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Inventories
Materials and supplies	$	271	$	311
Fuel	170		186
Natural gas	107		113
	$	548	$	610

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Property Plant and Equipment Property Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Line Items]

Schedule of Jointly Owned Utility Plants

tility subsidiaries’ jointly owned assets as of Dec. 31, 2018:

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Minnesota
Electric Generation:
Sherco Unit 3	$	604	$	415	$	1	59	%
Sherco Common Facilities	145		100		1		80
Other	5		4		—		59
Electric Transmission:
CapX2020 Transmission	960		73		2		51
Other	11		2		—		50
Total NSP-Minnesota	$	1,725	$	594	$	4

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Wisconsin
Electric Transmission:
La Crosse, WI to Madison, WI	$	175	$	2	$	—	37	%
CapX2020 Transmission	169		15		2		81
Total NSP-Wisconsin	$	344	$	17	$	2

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
PSCo
Electric Generation:
Hayden Unit 1	$	153	$	76	$	—	76	%
Hayden Unit 2	149		68		—		37
Hayden Common Facilities	41		21		—		53
Craig Units 1 and 2	81		40		—		10
Craig Common Facilities	39		21		—		7
Comanche Unit 3	886		130		—		67
Comanche Common Facilities	28		3		—		82
Electric Transmission:
Transmission and other facilities	183		63		1		Various
Gas Transportation:
Rifle, CO to Avon, CO	22		7		—		60
Gas Transportation Compressor	8		1		—		50
Total PSCo	$	1,590	$	430	$	1

Each company’s share of operating expenses and construction expenditures are included in the applicable utility accounts. Respective owners are responsible for providing their own financing.

Public Utility Property, Plant, and Equipment

Major classes of property, plant and equipment:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
Property, plant and equipment
Electric plant	$	41,472		$	39,016
Natural gas plant	6,210			5,800
Common and other property	2,154			2,013
Plant to be retired (a)	322			11
CWIP	2,091			2,087
Total property, plant and equipment	52,249			48,927
Less accumulated depreciation	(15,659		)	(15,000		)
Nuclear fuel	2,771			2,697
Less accumulated amortization	(2,417		)	(2,295		)
	$	36,944		$	34,329

^(a)  In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early in 2025.  Amounts are presented net of accumulated depreciation.

NSP-Minnesota

Property, Plant and Equipment [Line Items]

Schedule of Jointly Owned Utility Plants

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Minnesota
Electric Generation:
Sherco Unit 3	$	604	$	415	$	1	59	%
Sherco Common Facilities	145		100		1		80
Other	5		4		—		59
Electric Transmission:
CapX2020 Transmission	960		73		2		51
Other	11		2		—		50
Total NSP-Minnesota	$	1,725	$	594	$	4

NSP-Wisconsin

Property, Plant and Equipment [Line Items]

Schedule of Jointly Owned Utility Plants

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Wisconsin
Electric Transmission:
La Crosse, WI to Madison, WI	$	175	$	2	$	—	37	%
CapX2020 Transmission	169		15		2		81
Total NSP-Wisconsin	$	344	$	17	$	2

PSCo

Property, Plant and Equipment [Line Items]

Schedule of Jointly Owned Utility Plants

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
PSCo
Electric Generation:
Hayden Unit 1	$	153	$	76	$	—	76	%
Hayden Unit 2	149		68		—		37
Hayden Common Facilities	41		21		—		53
Craig Units 1 and 2	81		40		—		10
Craig Common Facilities	39		21		—		7
Comanche Unit 3	886		130		—		67
Comanche Common Facilities	28		3		—		82
Electric Transmission:
Transmission and other facilities	183		63		1		Various
Gas Transportation:
Rifle, CO to Avon, CO	22		7		—		60
Gas Transportation Compressor	8		1		—		50
Total PSCo	$	1,590	$	430	$	1

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Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets

Components of regulatory assets:

(Millions of Dollars)	See Note(s)	Remaining Amortization Period	Dec. 31, 2018				Dec. 31, 2017
Regulatory Assets			Current		Non- current		Current		Non- current
Pension and retiree medical obligations	11	Various	$	87	$	1,500	$	91	$	1,499
Net AROs (a)	1, 12	Plant lives	—		452		—		301
Excess deferred taxes - TCJA	7	Various	—		296		—		254
Recoverable deferred taxes on AFUDC recorded in plant		Plant lives	—		264		—		244
Environmental remediation costs	1, 12	Various	17		155		16		165
Depreciation differences		One to thirteen years	18		107		20		69
Benson biomass PPA termination and asset purchase		Ten years	10		86		—		—
Contract valuation adjustments (b)	1, 10	Term of related contract	17		77		21		93
Laurentian biomass PPA termination		Five years	18		73		—		—
Purchased power contract costs		Term of related contract	4		63		3		67
PI EPU		Sixteen years	3		56		3		58
Losses on reacquired debt		Term of related debt	4		44		5		48
State commission adjustments		Plant lives	1		29		1		29
Conservation programs (c)	1	One to two years	42		28		50		32
Property tax		Various	14		10		8		24
Nuclear refueling outage costs	1	One to two years	37		14		49		20
Deferred purchased natural gas and electric energy costs		One to three years	57		13		21		13
Renewable resources and environmental initiatives		One to two years	39		9		48		10
Sales true up and revenue decoupling		One to two years	38		7		37		12
Gas pipeline inspection and remediation costs		One to two years	28		3		24		12
Other		Various	30		40		27		55
Total regulatory assets			$	464	$	3,326	$	424	$	3,005

^(a) Includes amounts recorded for future recovery of AROs, less amounts recovered through nuclear decommissioning accruals and gains from decommissioning investments.

^(b) Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

^(c) Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

Regulatory Liabilities

Components of regulatory liabilities:

(Millions of Dollars)	See Note(s)	Remaining Amortization Period	Dec. 31, 2018				Dec. 31, 2017
Regulatory Liabilities			Current		Non- current		Current		Non- current
Deferred income tax adjustments and TCJA refunds (a)	7	Various	$	157	$	3,715	$	—	$	3,790
Plant removal costs	1, 12	Plant lives	—		1,175		—		1,131
Effects of regulation on employee benefit costs (b)		Various	—		137		—		46
Renewable resources and environmental initiatives		Various	9		54		19		60
ITC deferrals (c)	1	Various	—		40		—		23
Deferred electric, natural gas and steam production costs		Less than one year	102		—		104		—
Contract valuation adjustments (d)	1, 10	Less than one year	26		—		30		—
Conservation programs (e)	1	Less than one year	36		—		23		—
DOE settlement		Less than one year	19		—		18		—
Other		Various	87		66		45		33
Total regulatory liabilities (f)			$	436	$	5,187	$	239	$	5,083

^(a)  Includes the revaluation of recoverable/regulated plant ADIT and revaluation impact of non-plant ADIT due to the TCJA.

^(b)  Includes regulatory amortization and certain TCJA benefits approved by the CPUC to offset the PSCo prepaid pension asset at Dec. 31, 2018.

^(c)  Includes impact of lower federal tax rate due to the TCJA.

^(d)  Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

^(e)  Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

^(f)  Revenue subject to refund of $29 million and $15 million for 2018 and 2017, respectively, is included in other current liabilities.

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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Commercial Paper

Short-Term Debt — Xcel Energy Inc. and its utility subsidiaries meet their short-term liquidity requirements primarily through the issuance of commercial paper, term loan borrowings and letters of credit under their credit facilities.

Short-term debt borrowings outstanding for Xcel Energy were as follows:

	Three Months Ended Dec. 31, 2018			Year Ended Dec. 31
(Amounts in Millions, Except Interest Rates)				2018			2017			2016
Borrowing limit	$	3,250		$	3,250		$	3,250		$	2,750
Amount outstanding at period end	1,038			1,038			814			392
Average amount outstanding	500			788			644			485
Maximum amount outstanding	1,038			1,349			1,247			1,183
Weighted average interest rate, computed on a daily basis	2.76		%	2.34		%	1.35		%	0.74		%
Weighted average interest rate at end of period	2.97			2.97			1.90			0.95

Schedule of Debt To Total Capitalization Ratio

Features of the credit facilities:

	Debt-to-Total Capitalization Ratio(a)				Amount Facility May Be Increased (millions)		Additional Periods For Which a One-Year Extension May Be Requested (b)
	2018		2017
Xcel Energy Inc. (c)	58	%	58	%	$	200	2
NSP-Wisconsin	48		47		N/A		1
NSP-Minnesota	48		48		100		2
SPS	46		46		50		2
PSCo	46		44		100		2

^(a)  Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.

^(b)  All extension requests are subject to majority bank group approval.

^(c) The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. will be in default on its borrowings under the facility if it or any of its subsidiaries (except NSP-Wisconsin as long as its total assets do not comprise more than 15% of Xcel Energy’s consolidated total assets) default on indebtedness in an aggregate principal amount exceeding $75 million.

Credit Facilities

Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available as of Dec. 31, 2018:

(Millions of Dollars)	Credit Facility (a)		Drawn (b)		Available
Xcel Energy Inc.	$	1,500	$	488	$	1,012
PSCo	700		317		383
NSP-Minnesota	500		187		313
SPS	400		44		356
NSP-Wisconsin	150		51		99
Total	$	3,250	$	1,087	$	2,163

^(a)  These credit facilities mature in June 2021, with the exception of Xcel Energy’s Inc.’s 364-day term loan agreement which expires in December 2019.

^(b)  Includes outstanding commercial paper, term loan borrowings and letters of credit.

Schedule of Capitalization

Long term debt obligations for Xcel Energy Inc. and its utility subsidiaries as of Dec. 31:

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
Xcel Energy Inc.
Unsecured senior notes	2020 - 2041	2.40% - 6.50%	1.20% - 6.50%	$	3,400		$	2,900
Elimination of PSCo capital lease obligation with affiliates				(60		)	(62		)
Unamortized discount				(5		)	(2		)
Unamortized debt issuance cost				(21		)	(20		)
Current maturities (Capital lease obligation)				2			2
Total				$	3,316		$	2,818

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
NSP-Minnesota
Mortgage bonds	2020 - 2047	2.15% - 7.13%	2.15% - 7.13%	$	5,000		$	5,000
Unamortized discount				(21		)	(22		)
Unamortized debt issuance cost				(42		)	(45		)
Current maturities				—			—
Total				$	4,937		$	4,933

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
NSP-Wisconsin
Mortgage bonds	2024 - 2048	3.3% - 6.38%	3.3% - 6.38%	$	800		$	750
City of La Crosse resource recovery bond	2021	6.00%	6.00%	19			19
Other				—			2
Unamortized discount				(3		)	(3		)
Unamortized debt issuance cost				(9		)	(7		)
Current maturities				—			(151		)
Total				$	807		$	610

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
PSCo
Capital lease obligations	2025 - 2060	11.20% - 14.30%	11.20% - 14.30%	$	145		$	151
Mortgage bonds	2019 - 2048	2.25% - 6.50%	2.25% - 6.50%	4,900			4,500
Unamortized discount				(14		)	(13		)
Unamortized debt issuance cost				(33		)	(29		)
Current maturities				(406		)	(306		)
Total				$	4,592		$	4,303

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
SPS
Mortgage bonds	2024 - 2048	3.30% - 4.50%	3.30% - 4.50%	$	1,800		$	1,500
Unsecured senior notes	2033 - 2036	6.00%	6.00% - 8.75%	350			350
Unamortized discount				(4		)	(2		)
Unamortized debt issuance cost				(20		)	(18		)
Current maturities				—			—
Total				$	2,126		$	1,830

(Millions of Dollars)	Maturity Range	Interest Rate Range 2018	Interest Rate Range 2017	2018			2017
Other Subsidiaries
Various Eloigne Co. affordable housing project notes	2019 - 2052	0.00% - 6.90%	0.00% - 7.05%	$	26		$	28
Current maturities				(1		)	(2		)
Total				$	25		$	26

Schedule of Maturities of Long-term Debt

Maturities of long-term debt:

(Millions of Dollars)
2019	$	406
2020	1,257
2021	425
2022	902
2023	653

Schedule of Long-Term Debt Issuances

2018 financings:

	Amount	Financing Instrument	Interest Rate		Maturity Date
Xcel Energy Inc.	$500 million	Senior Notes	4.00	%	June 15, 2028
PSCo	350 million	First mortgage bonds	3.70		June 15, 2028
PSCo	350 million	First mortgage bonds	4.10		June 15, 2048
NSP-Wisconsin	200 million	First mortgage bonds	4.20		Sept. 1, 2048
SPS	300 million	First mortgage bonds	4.40		Nov 15, 2048

2017 financings:

	Amount	Financing Instrument	Interest Rate		Maturity Date
PSCo	$400 million	First mortgage bonds	3.80	%	June 15, 2047
SPS	450 million	First mortgage bonds	3.70		Aug. 15, 2047
NSP-Minnesota	600 million	First mortgage bonds	3.60		Sept. 15, 2047
NSP-Wisconsin	100 million	First mortgage bonds	3.75		Dec. 1, 2047

Capital Stock

Capital Stock — Preferred stock authorized/outstanding:

	Preferred Stock Authorized (Shares)	Par Value of Preferred Stock		Preferred Stock Outstanding (Shares) 2018 and 2017
Xcel Energy Inc.	7,000,000	$	100	—
PSCo	10,000,000	0.01		—
SPS	10,000,000	1.00		—

Xcel Energy Inc. had the following common stock authorized/outstanding:

Commons Stock Authorized (Shares)		Par Value of Common Stock		Common Stock Outstanding (Shares)2018	Common Stock Outstanding (Shares) 2017
1	billion	$	2.50	514,036,787	507,762,881

Other Capital Restrictions

	Amount Authorized to Issue
	Long-Term Debt				Short-Term Debt
NSP-Minnesota	52.93% of total capitalization			(a)	$	1.725	billion	(a)
NSP-Wisconsin	$	—		(b)	150		million
SPS	—			(b)	600		million
PSCo	1.1		billion		800		million

^(a)  NSP-Minnesota has authorization to issue long-term securities provided the equity-to-total capitalization remains within the required range, and to issue short-term debt provided it does not exceed 15% of total capitalization.

^(b)  SPS and NSP-Wisconsin will file for additional long-term debt authorization.

Authorizations as of Dec. 31, 2018:

	Amount Authorized to Issue
	Long-Term Debt				Short-Term Debt
NSP-Minnesota	52.93% of total capitalization			(a)	$	1.725	billion	(a)
NSP-Wisconsin	$	—		(b)	150		million
SPS	—			(b)	600		million
PSCo	1.1		billion		800		million

^(a)  NSP-Minnesota has authorization to issue long-term securities provided the equity-to-total capitalization remains within the required range, and to issue short-term debt provided it does not exceed 15% of total capitalization.

^(b)  SPS and NSP-Wisconsin will file for additional long-term debt authorization.

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Revenues (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Xcel Energy’s operating revenues (subsequent to adoption of the revised revenue guidance) consists of the following:

	Year Ended Dec. 31, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	2,919	$	988	$	38	$	3,945
C&I	4,874		524		25		5,423
Other	134		—		6		140
Total retail	7,927		1,512		69		9,508
Wholesale	791		—		—		791
Transmission	523		—		—		523
Other	98		100		—		198
Total revenue from contracts with customers	9,339		1,612		69		11,020
Alternative revenue and other	380		127		10		517
Total revenues	$	9,719	$	1,739	$	79	$	11,537

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Interest Payable related to Unrecognized Tax Benefits [Table Text Block]

Interest payable related to unrecognized tax benefits:

(Millions of Dollars)	2018		2017			2016
Payable for interest related to unrecognized tax benefits at Jan. 1	$	—	$	(3	)	$	—
Interest income (expense) related to unrecognized tax benefits	—		3			(3		)
Payable for interest related to unrecognized tax benefits at Dec. 31	$	—	$	—		$	(3	)

Summary of Statute of Limitations Applicable to Open Tax Years [Table Text Block]

Statute of limitations applicable to Xcel Energy’s consolidated federal income tax returns expire as follows:

Tax Year(s)	Expiration
2009 - 2014	October 2019
2015	September 2019
2016	September 2020
2017	September 2021

Earliest Open Tax Years Subject to Examination by State Taxing Authorities in the Major Operating Jurisdictions

Xcel Energy files consolidated state tax returns based on income in its major operating jurisdictions and various other state income-based tax returns.

As of Dec. 31, 2018, Xcel Energy’s earliest open tax years (subject to examination by state taxing authorities in its major operating jurisdictions) were as follows:

State	Year
Colorado	2009
Minnesota	2009
Texas	2010
Wisconsin	2014

• In the fourth quarter of 2018, the Minnesota audit of tax years 2010 - 2014 concluded with no material adjustments.

• In the third quarter of 2018, the Wisconsin audit of tax years 2012 - 2013 concluded with no material adjustments. In the fourth quarter of 2018, Wisconsin began an audit of tax years 2014 - 2016. No material adjustments have been proposed.

• No other state income tax audits were in progress as of Dec. 31, 2018.

Reconciliation of Unrecognized Tax Benefits

Unrecognized tax benefits - permanent vs. temporary:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Unrecognized tax benefit — Permanent tax positions	$	28	$	20
Unrecognized tax benefit — Temporary tax positions	9		19
Total unrecognized tax benefit	$	37	$	39

Changes in unrecognized tax benefits:

(Millions of Dollars)	2018			2017			2016
Balance at Jan. 1	$	39		$	134		$	121
Additions based on tax positions related to the current year	9			6			8
Reductions based on tax positions related to the current year	(4		)	(4		)	—
Additions for tax positions of prior years	2			15			10
Reductions for tax positions of prior years	(4		)	(105		)	(5		)
Settlements with taxing authorities	(5		)	(7		)	—
Balance at Dec. 31	$	37		$	39		$	134

Tax Benefits Associated with NOL and Tax Credit Carryforwards

Unrecognized tax benefits were reduced by tax benefits associated with NOL and tax credit carryforwards:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
NOL and tax credit carryforwards	$	(35	)	$	(31	)

NOL and Tax Credit Carryforwards

NOL amounts represent the tax loss that is carried forward and tax credits represent the deferred tax asset. NOL and tax credit carryforwards as of Dec. 31 were as follows:

(Millions of Dollars)	2018			2017
Federal NOL carryforward	$	—		$	1,072
Federal tax credit carryforwards	553			517
Valuation allowances for federal credit carryforwards	(5		)	(5		)
State NOL carryforwards	1,104			1,592
Valuation allowances for state NOL carryforwards	(50		)	(55		)
State tax credit carryforwards, net of federal detriment (a)	89			90
Valuation allowances for state credit carryforwards, net of federal benefit (b)	(69		)	(68		)

^(a)  State tax credit carryforwards are net of federal detriment of $24 million as of Dec. 31, 2018 and 2017.

^(b)  Valuation allowances for state tax credit carryforwards were net of federal benefit of $18 million as of Dec. 31, 2018 and 2017.

Schedule of Effective Income Tax Rate Reconciliation

Total income tax expense from operations differs from the amount computed by applying the statutory federal income tax rate to income before income tax expense.

Effective income tax rate for years ended Dec. 31:

	2018		2017 (a)		2016 (a)
Federal statutory rate	21.0	%	35.0	%	35.0	%
State income tax on pretax income, net of federal tax effect	5.0		4.1		4.1
Increases (decreases) in tax from:
Regulatory differences - ARAM (b)	(5.8	)	(0.1	)	(0.1	)
Wind production tax credits recognized	(5.2	)	(4.7	)	(3.4	)
Other tax credits recognized, net of federal income tax expense	(2.0	)	(1.0	)	(0.8	)
Regulatory differences - other utility plant items	(1.0	)	(0.7	)	(0.5	)
Regulatory differences - Deferral of ARAM (c)	0.6		—		—
Change in unrecognized tax benefits	0.4		(0.6	)	0.2
Tax reform	—		1.4		—
Other, net	(0.4	)	(1.3	)	(0.4	)
Effective income tax rate	12.6	%	32.1	%	34.1	%

^(a)  Prior periods have been reclassified to conform to current year presentation.

^(b)  ARAM is a method to flow back excess deferred taxes to customers.

^(c)  ARAM has been deferred when regulatory treatment has not been established. As Xcel Energy received direction from its regulatory commissions regarding the return of excess deferred taxes to customers, the ARAM deferral was reversed. This resulted in a reduction to tax expense with a corresponding reduction to revenue.

Schedule of Components of Income Tax Expense (Benefit)

Components of income tax expense for years ended Dec. 31:

(Millions of Dollars)	2018			2017			2016
Current federal tax (benefit) expense	$	(34	)	$	1		$	(3	)
Current state tax expense (benefit)	8			(11		)	(4		)
Current change in unrecognized tax (benefit) expense	(6		)	(83		)	6
Deferred federal tax expense	122			460			477
Deferred state tax expense	85			107			112
Deferred change in unrecognized tax expense (benefit)	11			73			(2		)
Deferred investment tax credits	(5		)	(5		)	(5		)
Total income tax expense	$	181		$	542		$	581

Components of deferred income tax expense as of Dec. 31:

(Millions of Dollars)	2018			2017			2016
Deferred tax expense (benefit) excluding items below	$	320		$	(2,939	)	$	631
Amortization and adjustments to deferred income taxes on income tax regulatory assets and liabilities	(102		)	3,583			(45		)
Tax (expense) benefit allocated to other comprehensive income, net of adoption of ASU No. 2018-02, and other	—			(4		)	1
Deferred tax expense	$	218		$	640		$	587

Schedule of Deferred Tax Assets and Liabilities

Components of net deferred tax liability as of Dec. 31:

(Millions of Dollars)	2018			2017
Deferred tax liabilities:
Differences between book and tax bases of property	$	5,082		$	4,960
Regulatory assets	599			565
Pension expense	178			199
Other	64			57
Total deferred tax liabilities	$	5,923		$	5,781
Deferred tax assets:
Regulatory liabilities	$	879		$	886
Tax credit carryforward	642			607
NOL carryforward	51			293
NOL and tax credit valuation allowances	(79		)	(77		)
Other employee benefits	124			132
Deferred ITCs	16			17
Rate refund	60			10
Other	65			68
Total deferred tax assets	$	1,758		$	1,936
Net deferred tax liability	$	4,165		$	3,845

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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Restricted Stock

Shares of restricted stock granted at Dec. 31:

(Shares in Thousands)	2018		2017		2016
Granted shares	18		15		20
Grant date fair value	$	44.68	$	42.00	$	38.82

Changes in nonvested restricted stock:

(Shares in Thousands)	Shares		Weighted Average Grant Date Fair Value
Nonvested restricted stock at Jan. 1, 2018	44		$	39.71
Granted	18		44.68
Forfeited	—		—
Vested	(27	)	37.25
Dividend equivalents	1		46.27
Nonvested restricted stock at Dec. 31, 2018	36		44.29

Other Equity Awards

Equity award units granted to employees (excluding restricted stock):

(Units in Thousands)	2018		2017		2016
Granted units	500		503		522
Weighted average grant date fair value	$	47.60	$	41.02	$	36.00

Equity awards vested:

(Units in Thousands)	2018		2017		2016
Vested Units	475		467		530
Total Fair Value	$	23,393	$	22,459	$	21,575

Changes in the nonvested portion of equity award units for 2018:

(Units in Thousands)	Units		Weighted Average Grant Date Fair Value
Nonvested Units at Jan. 1, 2018	995		$	38.48
Granted	500		47.60
Forfeited	(126	)	41.74
Vested	(475	)	35.92
Dividend equivalents	45		40.74
Nonvested Units at Dec. 31, 2018	939		44.30

Stock Equivalent Unit Plan

Stock equivalent units granted:

(Units in Thousands)	2018		2017		2016
Granted units	36		51		49
Weighted average grant date fair value	$	45.44	$	46.05	$	40.68

Changes in stock equivalent units:

(Units in Thousands)	Units		Weighted Average Grant Date Fair Value
Stock equivalent units at Jan. 1, 2018	753		$	29.83
Granted	36		45.44
Units distributed	(123	)	31.21
Dividend equivalents	22		46.40
Stock equivalent units at Dec. 31, 2018	688		30.93

TSR Liability Awards

TSR liability awards granted:

(In Thousands)	2018	2017	2016
Awards granted	239	240	264

TSR liability awards settled:

(In Thousands)	2018		2017		2016
Awards settled	482		454		354
Settlement amount (cash, common stock and deferred amounts)	$	21,534	$	19,083	$	13,724

Compensation costs related to share-based awards

Compensation costs related to share-based awards:

(Millions of Dollars)	2018		2017		2016
Compensation cost for share-based awards (a)	$	45	$	57	$	41
Tax benefit recognized in income	12		22		16

^(a)  Compensation costs for share-based payment are included in O&M expense.

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Fair Value of Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Cost and Fair Value of Nuclear Decommissioning Fund Investments

Non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund:

	Dec. 31, 2018
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		NAV		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	24	$	24	$	—	$	—	$	—	$	24
Commingled funds	758		79		—		—		819		898
Debt securities	466		—		436		—		—		436
Equity securities	401		697		—		—		—		697
Total	$	1,649	$	800	$	436	$	—	$	819	$	2,055

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $141 million of equity investments in unconsolidated subsidiaries and $121 million of rabbi trust assets and miscellaneous investments.

	Dec. 31, 2017
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		NAV		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	29	$	29	$	—	$	—	$	—	$	29
Commingled funds	701		223		—		—		659		882
Debt securities	438		—		441		—		—		441
Equity securities	423		791		—		—		—		791
Total	$	1,591	$	1,043	$	441	$	—	$	659	$	2,143

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $140 million of equity investments in unconsolidated subsidiaries and $114 million of rabbi trust assets and miscellaneous investments.

For th

Final Contractual Maturity Dates of Debt Securities in the Nuclear Decommissioning Fund by Asset Class

Contractual maturity dates of debt securities in the nuclear decommissioning fund as of Dec. 31, 2018:

	Final Contractual Maturity
(Millions of Dollars)	Due in 1 Year or Less		Due in 1 to 5 Years		Due in 5 to 10 Years		Due after 10 Years		Total
Debt securities	$	10	$	107	$	211	$	108	$	436

Rabbi

Rabbi Trust Securities Amortized Cost and Fair Value Measured on Recurrring Basis [Table Text Block]

rusts

Xcel Energy has established rabbi trusts to provide partial funding for future distributions of its SERP and deferred compensation plan.

Cost and fair value of assets held in rabbi trusts:

	Dec. 31, 2018
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	16	$	16	$	—	$	—	$	16
Mutual funds	52		51		—		—		51
Total	$	68	$	67	$	—	$	—	$	67

	Dec. 31, 2017
			Fair Value
(Millions of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	12	$	12	$	—	$	—	$	12
Mutual funds	47		50		—		—		50
Total	$	59	$	62	$	—	$	—	$	62

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet.

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

Gross notional amounts of commodity forwards, options and FTRs as of Dec. 31:

(Amounts in Millions) (a) (b)	2018	2017
MWh of electricity	87	68
MMBtu of natural gas	92	37

^(a)  Amounts are not reflective of net positions in the underlying commodities.

^(b)  Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Financial impact of qualifying interest rate and vehicle fuel cash flow hedges on Xcel Energy’s accumulated other comprehensive loss, included in the consolidated statements of common stockholders’ equity and in the consolidated statements of comprehensive income:

(Millions of Dollars)	2018			2017			2016
Accumulated other comprehensive loss related to cash flow hedges at Jan. 1	$	(58	)	$	(51	)	$	(55	)
After-tax net unrealized losses related to derivatives accounted for as hedges	(5		)	—			—
After-tax net realized losses on derivative transactions reclassified into earnings	3			3			4
Adoption of ASU. 2018-02 (a)	—			(10		)	—
Accumulated other comprehensive loss related to cash flow hedges at Dec. 31	$	(60	)	$	(58	)	$	(51	)

^(a)  In 2017, Xcel Energy implemented ASU No. 2018-02 related to TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.

Derivative Instruments, Gain (Loss) [Table Text Block]

Impact of derivative activity:

	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:
(Millions of Dollars)	Accumulated Other Comprehensive Loss			Regulatory (Assets) and Liabilities
Year Ended Dec. 31, 2018
Derivatives designated as cash flow hedges
Interest rate	$	(7	)	$	—
Total	$	(7	)	$	—
Other derivative instruments
Electric commodity	$	—		$	1
Natural gas commodity	—			10
Total	$	—		$	11
Year Ended Dec. 31, 2017
Other derivative instruments
Electric commodity	$	—		$	10
Natural gas commodity	—			(13		)
Total	$	—		$	(3	)
Year Ended Dec. 31, 2016
Other derivative instruments
Electric commodity	$	—		$	17
Natural gas commodity	—			1
Total	$	—		$	18

	Pre-Tax (Gains) Losses Reclassified into Income During the Period from:							Pre-Tax Gains (Losses) Recognized During the Period in Income
(Millions of Dollars)	Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Year Ended Dec. 31, 2018
Derivatives designated as cash flow hedges
Interest rate	$	4	(a)	$	—			$	—
Total	$	4		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	14		(b)
Electric commodity	—			(1		)	(c)	—
Natural gas commodity	—			(6		)	(d)	(4		)	(d)
Total	$	—		$	(7	)		$	10
Year Ended Dec. 31, 2017
Derivatives designated as cash flow hedges
Interest rate	$	5	(a)	$	—			$	—
Total	$	5		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	10		(b)
Electric commodity	—			(15		)	(c)	—
Natural gas commodity	—			3			(d)	(6		)	(d)
Total	$	—		$	(12	)		$	4
Year Ended Dec. 31, 2016
Derivatives designated as cash flow hedges
Interest rate	$	6	(a)	$	—			$	—
Total	$	6		$	—			$	—
Other derivative instruments
Commodity trading	$	—		$	—			$	2		(b)
Electric commodity	—			(8		)	(c)	—
Natural gas commodity	—			15			(d)	(8		)	(d)
Total	$	—		$	7			$	(6	)

^(a)  Amounts recorded to interest charges.

^(b)  Amounts recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.

^(c)  Amounts recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.

^(d)  Amounts for the year ended Dec. 31, 2018 included $1 million of settlement losses on derivatives entered to mitigate natural gas price risk for electric generation recorded to electric fuel and purchased power, subject to cost-recovery mechanisms and reclassified to a regulatory asset, as appropriate. Such gains and losses for the years ended Dec. 31, 2017 and 2016 were immaterial. Remaining settlement losses for the years ended Dec. 31, 2018, 2017 and 2016 related to natural gas operations and were recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis:

	Dec. 31, 2018													Dec. 31, 2017
	Fair Value						Fair Value Total		Netting (a)					Fair Value						Fair Value Total		Netting (a)
(Millions of Dollars)	Level 1		Level 2		Level 3							Total		Level 1		Level 2		Level 3							Total
Current derivative assets
Commodity trading	$	4	$	92	$	2	$	98	$	(44	)	$	54	$	2	$	22	$	—	$	24	$	(15	)	$	9
Electric commodity	—		—		25		25		—			25		—		—		32		32		(2		)	30
Natural gas commodity	—		4		—		4		—			4		—		—		—		—		—			—
Total current derivative assets	$	4	$	96	$	27	$	127	$	(44	)	83		$	2	$	22	$	32	$	56	$	(17	)	39
PPAs (b)												4													5
Current derivative instruments												$	87												$	44
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	—	$	27	$	5	$	32	$	(14	)	$	18	$	—	$	31	$	5	$	36	$	(7	)	$	29
Total noncurrent derivative assets	$	—	$	27	$	5	$	32	$	(14	)	18		$	—	$	31	$	5	$	36	$	(7	)	29
PPAs (b)												16													19
Noncurrent derivative instruments												$	34												$	48

	Dec. 31, 2018													Dec. 31, 2017
	Fair Value						Fair Value Total		Netting (a)					Fair Value						Fair Value Total		Netting (a)
(Millions of Dollars)	Level 1		Level 2		Level 3							Total		Level 1		Level 2		Level 3							Total
Current derivative liabilities
Derivatives designated as cash flow hedges:
Interest rate	$	—	$	7	$	—	$	7	$	—		$	7	$	—	$	—	$	—	$	—	$	—		$	—
Other derivative instruments:
Commodity trading	4		88		2		94		(60		)	34		2		18		—		20		(15		)	5
Electric commodity	—		—		—		—		—			—		—		—		2		2		(2		)	—
Natural gas commodity	—		—		—		—		—			—		—		1		—		1		—			1
Total current derivative liabilities	$	4	$	95	$	2	$	101	$	(60	)	41		$	2	$	19	$	2	$	23	$	(17	)	6
PPAs (b)												20													23
Current derivative instruments												$	61												$	29
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	—	$	18	$	1	$	19	$	17		$	36	$	—	$	24	$	—	$	24	$	(10	)	$	14
Total noncurrent derivative liabilities	$	—	$	18	$	1	$	19	$	17		36		$	—	$	24	$	—	$	24	$	(10	)	14
PPAs (b)												93													112
Noncurrent derivative instruments												$	129												$	126

^(a)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements as of Dec. 31, 2018 and 2017. At Dec. 31, 2018 and 2017, derivative assets and liabilities include $32 million and $0 million of obligations to return cash collateral, respectively. At Dec. 31, 2018 and 2017, derivative assets and liabilities include rights to reclaim cash collateral of $15 million and $3 million, respectively. Counterparty netting excludes settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

^(b)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block]

Changes in Level 3 commodity derivatives:

	Year Ended Dec. 31
(Millions of Dollars)	2018			2017			2016
Balance at Jan. 1	$	35		$	17		$	18
Purchases	59			82			35
Settlements	(59		)	(97		)	(89		)
Net transactions recorded during the period:
(Losses) gains recognized in earnings (a)	(1		)	5			—
Net (losses) gains recognized as regulatory assets and liabilities	(5		)	28			53
Balance at Dec. 31	$	29		$	35		$	17

^(a)  Amounts relate to commodity derivatives held at the end of the period.

Fair Value, by Balance Sheet Grouping [Table Text Block]

As of Dec. 31, other financial instruments for which the carrying amount did not equal fair value:

	2018				2017
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	16,209	$	16,755	$	14,977	$	16,531

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Benefit Plans and Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2018

Benefit Plans and Other Postretirement Benefits [Abstract]

Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost

	Pension Benefits						Postretirement Benefits
(Millions of Dollars)	2018			2017			2018			2017
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost:
Net loss	$	1,633		$	1,709		$	116		$	147
Prior service credit	(20		)	(25		)	(33		)	(44		)
Total	$	1,613		$	1,684		$	83		$	103
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost Have Been Recorded as Follows Based Upon Expected Recovery in Rates:
Current regulatory assets	$	94		$	100		$	—		$	—
Noncurrent regulatory assets	1,446			1,511			89			107
Current regulatory liabilities	—			—			(1		)	(1		)
Noncurrent regulatory liabilities	—			—			(10		)	(10		)
Deferred income taxes	19			19			1			2
Net-of-tax accumulated other comprehensive income	54			54			4			5
Total	$	1,613		$	1,684		$	83		$	103

Components of Net Periodic Benefit Costs

Net Periodic Benefit Cost (Credit) —Net periodic benefit cost (credit), other than the service cost component, is included in other income in the consolidated statements of income.

Components of net periodic benefit cost (credit) and amounts recognized in other comprehensive income and regulatory assets and liabilities:

	Pension Benefits									Postretirement Benefits
(Millions of Dollars)	2018			2017			2016			2018			2017			2016
Service cost	$	94		$	94		$	92		$	2		$	2		$	2
Interest cost	133			147			160			22			24			26
Expected return on plan assets	(209		)	(209		)	(210		)	(26		)	(25		)	(25		)
Amortization of prior service credit	(5		)	(2		)	(2		)	(11		)	(11		)	(11		)
Amortization of net loss	111			107			97			8			7			4
Settlement charge (a)	91			81			—			—			—			—
Net periodic pension cost (credit)	215			218			137			(5		)	(3		)	(4		)
Costs not recognized due to effects of regulation	(75		)	(79		)	(15		)	2			—			—
Net benefit cost (credit) recognized for financial reporting	$	140		$	139		$	122		$	(3	)	$	(3	)	$	(4	)
Significant Assumptions Used to Measure Costs:
Discount rate	3.63		%	4.13		%	4.66		%	3.62		%	4.13		%	4.65		%
Expected average long-term increase in compensation level	3.75			3.75			4.00			—			—			—
Expected average long-term rate of return on assets	6.87			6.87			6.87			5.30			5.80			5.80

^(a)  A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In 2018 and 2017, as a result of lump-sum distributions during the 2018 and 2017 plan years, Xcel Energy recorded a total pension settlement charge of $91 million in 2018 and $81 million in 2017, the majority of which was not recognized due to the effects of regulation. A total of $11 million and $8 million was recorded in the consolidated statements of income in 2018 and 2017, respectively.

Target Asset Allocations and Plan Assets Measured at Fair Value

.

Targeted asset allocations:

	Pension Benefits				Postretirement Benefits
	2018		2017		2018		2017
Domestic and international equity securities	36	%	36	%	18	%	24	%
Long-duration fixed income securities	30		27		—		—
Short-to-intermediate fixed income securities	17		20		70		60
Alternative investments	15		15		8		9
Cash	2		2		4		7
Total	100	%	100	%	100	%	100	%

The following presents, for each of the fair value hierarchy levels, Xcel Energy’s pension plan assets measured at fair value:

	Dec. 31, 2018 (a)												Dec. 31, 2017 (a)
(Millions of Dollars)	Level 1		Level 2		Level 3		Measured at NAV			Total			Level 1			Level 2		Level 3		Measured at NAV		Total
Cash equivalents	$	137	$	—	$	—	$	—		$	137		$	196		$	—	$	—	$	—	$	196
Commingled funds:	914		—		—		987			1,901			1,054			—		—		1,075		2,129
Debt securities:	—		621		—		—			621			—			673		—		—		673
Equity securities:	106		—		—		—			106			114			—		—		—		114
Other	2		5		—		(30		)	(23		)	(29		)	4		—		1		(24		)
Total	$	1,159	$	626	$	—	$	957		$	2,742		$	1,335		$	677	$	—	$	1,076	$	3,088

^(a)  See Note 10 for further information regarding fair value measurement inputs and methods.

The following presents, for each of the fair value hierarchy levels, Xcel Energy’s postretirement benefit plan assets that were measured at fair value:

	Dec. 31, 2018 (a)										Dec. 31, 2017 (a)
(Millions of Dollars)	Level 1		Level 2		Level 3		Measured at NAV		Total		Level 1		Level 2		Level 3		Measured at NAV		Total
Cash equivalents	$	19	$	—	$	—	$	—	$	19	$	29	$	—	$	—	$	—	$	29
Insurance contracts	—		45		—		—		45		—		50		—		—		50
Commingled funds	133		—		—		40		173		148		—		—		—		148
Debt securities	—		179		—		—		179		—		198		—		—		198
Equity securities	—		—		—		—		—		35		—		—		—		35
Other	—		1		—		—		1		—		1		—		—		1
Total	$	152	$	225	$	—	$	40	$	417	$	212	$	249	$	—	$	—	$	461

^(a)  See Note 10 for further information on fair value measurement inputs and methods.

Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]

Funded Status — Comparisons of the actuarially computed benefit obligation, changes in plan assets and funded status of the pension and postretirement health care plans for Xcel Energy are as follows:

	Pension Benefits						Postretirement Benefits
(Millions of Dollars)	2018			2017			2018			2017
Change in Benefit Obligation:
Obligation at Jan. 1	$	3,828		$	3,682		$	621		$	603
Service cost	94			94			2			2
Interest cost	133			147			22			24
Plan amendments	—			(13		)	—			—
Actuarial (gain) loss	(224		)	259			(62		)	33
Plan participants’ contributions	—			—			8			8
Medicare subsidy reimbursements	—			—			1			1
Benefit payments (a)	(354		)	(341		)	(50		)	(50		)
Obligation at Dec. 31	$	3,477		$	3,828		$	542		$	621
Change in Fair Value of Plan Assets:
Fair value of plan assets at Jan. 1	$	3,088		$	2,856		$	461		$	442
Actual return on plan assets	(142		)	411			(13		)	41
Employer contributions	150			162			11			20
Plan participants’ contributions	—			—			8			8
Benefit payments	(354		)	(341		)	(50		)	(50		)
Fair value of plan assets at Dec. 31	$	2,742		$	3,088		$	417		$	461
Funded status of plans at Dec. 31	$	(735	)	$	(740	)	$	(125	)	$	(160	)
Amounts recognized in the Consolidated Balance Sheet at Dec. 31:
Current liabilities	$	—		$	—		$	(7	)	$	(3	)
Noncurrent liabilities	(735		)	(740		)	(118		)	(157		)
Net amounts recognized	$	(735	)	$	(740	)	$	(125	)	$	(160	)

^(a)  Includes approximately $198 million in 2018 and $174 million in 2017 of lump-sum benefit payments used in the determination of a settlement charge.

Projected Benefit Payments for the Pension and Postretirement Benefit Plans

Xcel Energy’s projected benefit payments:

(Millions of Dollars)	Projected Pension Benefit Payments		Gross Projected Postretirement Health Care Benefit Payments		Expected Medicare Part D Subsidies		Net Projected Postretirement Health Care Benefit Payments
2019	$	281	$	45	$	2	$	43
2020	260		45		2		43
2021	259		45		2		43
2022	260		44		2		42
2023	259		43		2		41
2024-2028	1,238		197		13		184

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Funded Status of Nuclear Decommissioning Obligation [Table Text Block]

	Regulatory Basis
(Millions of Dollars)	2018			2017
Estimated decommissioning cost obligation from most recently approved study (in 2014 dollars)	$	3,012		$	3,012
Effect of escalating costs	539			396
Estimated decommissioning cost obligation (in current dollars)	3,551			3,408
Effect of escalating costs to payment date	7,654			7,797
Estimated future decommissioning costs (undiscounted)	11,205			11,205
Effect of discounting obligation (using average risk-free interest rate of 3.33% and 2.80% for 2018 and 2017, respectively)	(6,911		)	(6,398		)
Discounted decommissioning cost obligation	$	4,294		$	4,807
Assets held in external decommissioning trust	$	2,055		$	2,143
Underfunding of external decommissioning fund compared to the discounted decommissioning obligation	2,239			2,664

Estimated Minimum Purchases Under Fuel Contracts

Estimated minimum purchases under these contracts as of Dec. 31, 2018:

(Millions of Dollars)	Coal		Nuclear fuel		Natural gas supply		Natural gas supply and transportation
2019	$	461	$	127	$	416	$	268
2020	260		51		263		255
2021	149		99		254		245
2022	109		79		114		234
2023	61		99		60		170
Thereafter	108		337		—		923
Total	$	1,148	$	792	$	1,107	$	2,095

Estimated Future Payments for Capacity and Energy Pursuant to Purchased Power Agreements

At Dec. 31, 2018, the estimated future payments for capacity and energy that the utility subsidiaries of Xcel Energy are obligated to purchase pursuant to these executory contracts, subject to availability, were as follows:

(Millions of Dollars)	Capacity		Energy (a)
2019	$	86	$	99
2020	70		109
2021	78		157
2022	77		173
2023	79		177
Thereafter	125		328
Total	$	515	$	1,043

^(a)  Excludes contingent energy payments for renewable energy PPAs.

Summary of Property Held Under Capital Leases

Property held under capital leases:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
Gas storage facilities	$	201		$	201
Gas pipeline	21			21
Property held under capital leases	222			222
Accumulated depreciation	(77		)	(71		)
Total property held under capital leases, net	$	145		$	151

Future Commitments Under Operating and Capital Leases

Future commitments under operating and capital leases:

(Millions of Dollars)	Operating Leases		PPA (a) (b) Operating Leases		Total Operating Leases		Capital Leases
2019	$	32	$	207	$	239	$	14
2020	26		208		234		14
2021	25		210		235		14
2022	24		197		221		12
2023	22		186		208		12
Thereafter	154		883		1,037		220
Total minimum obligation							286
Interest component of obligation							(201		)
Present value of minimum obligation							$	85		(c)

^(a)  Amounts do not include PPAs accounted for as executory contracts.

^(b)  PPA operating leases contractually expire through 2034.

^(c)  Excludes certain amounts related to Xcel Energy’s 50% ownership interest in WYCO.

Eloigne and NSP-Wisconsin Low-income Housing Limited Partnerships

Amounts reflected in Xcel Energy’s consolidated balance sheets for the Eloigne and NSP-Wisconsin low-income housing limited partnerships:

(Millions of Dollars)	Dec. 31, 2018		Dec. 31, 2017
Current assets	$	5	$	6
Property, plant and equipment, net	42		46
Other noncurrent assets	1		1
Total assets	$	48	$	53
Current liabilities	$	7	$	9
Mortgages and other long-term debt payable	26		26
Other noncurrent liabilities	—		1
Total liabilities	$	33	$	36

Committed Minimum Payments Under Technology Agreements

Committed minimum payments under these obligations:

(Millions of Dollars)	IBM Agreement		Accenture Agreement
2019	$	30	$	11
2020	16		11
2021	16		—
2022	7		—
2023	—		—
Thereafter	—		—

Asset Retirement Obligations

Xcel Energy’s AROs were as follows:

	Dec. 31, 2018
(Millions  of Dollars)	Jan. 1, 2018		Amounts Incurred (a)		Amounts Settled (b)			Accretion		Cash Flow Revisions(c)			Dec. 31, 2018
Electric
Nuclear	$	1,874	$	—	$	—		$	94	$	—		$	1,968
Steam, hydro, and other production	192		—		(14		)	8		(9		)	177
Wind	96		12		—			4		7			119
Distribution	21		—		—			1		20			42
Miscellaneous	5		—		—			—		2			7
Natural gas
Transmission and distribution	282		—		—			13		(46		)	249
Miscellaneous	4		—		—			—		—			4
Common
Miscellaneous	1		—		—			—		—			1
Non-utility
Miscellaneous	—		1		—			—		—			1
Total liability	$	2,475	$	13	$	(14	)	$	120	$	(26	)	$	2,568

^(a)  Amounts incurred related to the PSCo Rush Creek wind farm and Nicollet Projects community solar gardens, which were placed in service in 2018.

^(b)  Amounts settled related to asbestos abatement projects and closure of certain ash containment facilities.

^(c)  In 2018, AROs were revised for changes in timing and estimates of cash flows. Changes in gas transmission and distribution AROs were primarily related to increased gas line mileage and number of services, which were more than offset by increased discount rates. Changes in electric distribution AROs primarily related to increased labor costs.

	Dec. 31, 2017
(Millions  of Dollars)	Jan. 1, 2017		Amounts Incurred		Amounts Settled(a)			Accretion		Cash Flow Revisions(b)			Dec. 31, 2017
Electric
Nuclear	$	2,249	$	—	$	—		$	114	$	(489	)	$	1,874
Steam, hydro, and other production	205		1		(29		)	9		6			192
Wind	92		—		—			4		—			96
Distribution	20		—		—			1		—			21
Miscellaneous	5		—		—			—		—			5
Natural gas
Transmission and distribution	205		—		—			8		69			282
Miscellaneous	4		—		—			—		—			4
Common
Miscellaneous	2		—		(1		)	—		—			1
Total liability	$	2,782	$	1	$	(30	)	$	136	$	(414	)	$	2,475

^(a)  Amounts settled related to asbestos abatement, closure of ash containment facilities, and removal and disposal of storage tanks and other above ground equipment.

^(b)  In 2017, AROs were revised for changes in timing and estimates of cash flows. Nuclear AROs decreased due to updated assumptions. Changes in gas transmission and distribution AROs were primarily related to increased labor costs.

Plant Removal Costs

g depreciation rates.

Accumulated balances by entity at Dec. 31:

(Millions of Dollars)	2018		2017
NSP-Minnesota	$	485	$	442
PSCo	344		346
SPS	188		197
NSP-Wisconsin	158		146
Total Xcel Energy	$	1,175	$	1,131

Reconciliation of Decommissioning Cost Obligation - Regulatory to GAAP

(Millions of Dollars)	2018			2017
Discounted decommissioning cost obligation - regulated basis	$	4,294		$	4,807
Differences in discount rate and market risk premium	(1,447		)	(1,403		)
O&M costs not included for GAAP	(879		)	(1,041		)
ARO differences between 2017 and 2014 cost studies	—			(489		)
Nuclear production decommissioning ARO - GAAP	$	1,968		$	1,874

Nuclear Decommissioning Expenses Recognized as Result of Regulation

(Millions of Dollars)	2018		2017		2016
Annual decommissioning recorded as depreciation expense: (a) (b)	$	20	$	20	$	20

Total expense for energy and capacity payments table text block [Table Text Block]

Total expenses (including capacity payments) under operating lease obligations for Xcel Energy and the corresponding capacity payments for PPAs accounted for as operating leases for the year ended Dec. 31:

(Millions of Dollars)	2018		2017		2016
Total expense	$	248	$	246	$	255
Capacity payments	210		210		216

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Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax

Changes in accumulated other comprehensive (loss), net of tax, for the years ended Dec. 31:

	2018
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges				Defined Benefit Pension and Postretirement Items				Total
Accumulated other comprehensive loss at Jan. 1	$	(58	)		$	(67	)		$	(125	)
Other comprehensive loss before reclassifications (net of taxes of $(2) and $(2), respectively)	(5		)		(6		)		(11		)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $1 and $0, respectively)	3			(a)	—				3
Amortization of net actuarial loss (net of taxes of $0 and $3, respectively)	—				9			(b)	9
Net current period other comprehensive income (loss)	(2		)		3				1
Accumulated other comprehensive loss at Dec. 31	$	(60	)		$	(64	)		$	(124	)

	2017
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges				Defined Benefit Pension and Postretirement Items				Total
Accumulated other comprehensive loss at Jan. 1	$	(51	)		$	(59	)		$	(110	)
Other comprehensive loss before reclassifications (net of taxes of $0 and $(2), respectively)	—				(3		)		(3		)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $2 and $0, respectively)	3			(a)	—				3
Amortization of net actuarial loss (net of taxes of $0 and $5, respectively)	—				7			(b)	$	7
Net current period other comprehensive income	3				4				7
Adoption of ASU No. 2018-02 (c)	(10		)		(12		)		(22		)
Accumulated other comprehensive loss at Dec. 31	$	(58	)		$	(67	)		$	(125	)

^(a)  Included in interest charges.

^(b)  Included in the computation of net periodic pension and postretirement benefit costs.

^(c)  In 2017, Xcel Energy implemented ASU No. 2018-02 related to the TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.

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Segments and Related Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Results from Operations by Reportable Segment

Xcel Energy’s segment information:

(Millions of Dollars)	2018			2017			2016
Regulated Electric
Operating revenues from external customers	$	9,719		$	9,676		$	9,500
Intersegment revenue	1			2			1
Total revenues	$	9,720		$	9,678		$	9,501
Depreciation and amortization	1,421			1,298			1,136
Interest charges and financing costs	449			449			450
Income tax expense	187			528			567
Net income	1,177			1,066			1,067
Regulated Natural Gas
Operating revenues from external customers	$	1,739		$	1,650		$	1,531
Intersegment revenue	2			1			1
Total revenues	$	1,741		$	1,651		$	1,532
Depreciation and amortization	212			174			160
Interest charges and financing costs	61			57			54
Income tax expense	28			23			76
Net income	187			182			124
All Other
Total operating revenue	$	79		$	78		$	76
Depreciation and amortization	9			7			7
Interest charges and financing costs	142			122			116
Income tax (benefit)	(34		)	(9		)	(62		)
Net (loss)	(103		)	(100		)	(68		)
Consolidated Total
Total revenue	$	11,540		$	11,407		$	11,109
Reconciling eliminations	(3		)	(3		)	(2		)
Consolidated total revenue	$	11,537		$	11,404		$	11,107
Depreciation and amortization	1,642			1,479			1,303
Interest charges and financing costs	652			628			620
Income tax expense	181			542			581
Net income	1,261			1,148			1,123

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Summarized Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Summarized Quarterly Financial Data (Unaudited)

	Quarter Ended
(Amounts in millions, except per share data)	March 31, 2018		June 30, 2018		Sept. 30, 2018		Dec. 31, 2018
Operating revenues	$	2,951	$	2,658	$	3,048	$	2,880
Operating income (a)	480		450		696		339
Net income	291		265		491		214
EPS total — basic	$	0.57	$	0.52	$	0.96	$	0.42
EPS total — diluted	0.57		0.52		0.96		0.42
Cash dividends declared per common share	0.38		0.38		0.38		0.38

	Quarter Ended
(Amounts in millions, except per share data)	March 31, 2017		June 30, 2017		Sept. 30, 2017		Dec. 31, 2017
Operating revenues	$	2,946	$	2,645	$	3,017	$	2,796
Operating income (a)	492		466		824		440
Net income	239		227		492		189
EPS total — basic	$	0.47	$	0.45	$	0.97	$	0.37
EPS total — diluted	0.47		0.45		0.97		0.37
Cash dividends declared per common share	0.36		0.36		0.36		0.36

^(a)  In 2018, Xcel Energy implemented ASU No. 2017-07 related to net periodic benefit cost, which resulted in retrospective reclassification of pension costs from O&M expense to other income.

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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense expressed as a percentage of average depreciable property	3.10%	3.10%	2.90%
Nuclear Decommissioning [Abstract]
Minimum amount of time between nuclear decommissioning studies (in years)	3 years
Cash and Cash Equivalents [Abstract]
Maximum number of months of remaining maturity at time of purchase to consider investments in certain instruments as cash equivalents	3 months
Accounts, Notes, Loans and Financing Receivable [Abstract]
Allowance for bad debts	$ 55	$ 52
Alternative Revenue Programs [Abstract]
Maximum number of months following end of annual period in which revenues are earned to be included in incentive programs	24 months
Public Utilities, Inventory [Line Items]
Inventories	$ 548	610
Supplies [Member]
Public Utilities, Inventory [Line Items]
Inventories	271	311
Public Utilities, Inventory, Fuel [Member]
Public Utilities, Inventory [Line Items]
Inventories	170	186
Public Utilities, Inventory, Natural Gas [Member]
Public Utilities, Inventory [Line Items]
Inventories	$ 107	$ 113

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Accounting Pronouncements Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Accounting Standards Update 2016-02 - Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Assets			$ 2,000
Operating Lease, Liabilities			$ 2,000
Other Expense [Member] | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 33	$ 26

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Property Plant and Equipment Property Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 52,249	$ 48,927
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(15,659)	(15,000)
Property, Plant and Equipment, Net	36,944	34,329
Electric plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment	41,472	39,016
Natural gas plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment	6,210	5,800
Common and other property
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,154	2,013
Plant to be retired
Property, Plant and Equipment [Line Items]
Property, plant and equipment	322	11
CWIP
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,091	2,087
Nuclear fuel
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,771	2,697
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ (2,417)	$ (2,295)

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Property Plant and Equipment Joint Ownership (Details) $ in Millions	Dec. 31, 2018 USD ($)
NSP-Minnesota
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 1,725
Accumulated Depreciation	594
CWIP	4
NSP-Minnesota | Electric Generation | Sherco Unit 3
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	604
Accumulated Depreciation	415
CWIP	$ 1
Ownership percentage (in hundredths)	59.00%
NSP-Minnesota | Electric Generation | Sherco Common Facilities Units 1, 2 and 3
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 145
Accumulated Depreciation	100
CWIP	$ 1
Ownership percentage (in hundredths)	80.00%
NSP-Minnesota | Electric Generation | Sherco Substation
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 5
Accumulated Depreciation	4
CWIP	$ 0
Ownership percentage (in hundredths)	59.00%
NSP-Minnesota | Electric Transmission | Grand Meadow Line and Substation
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 960
Accumulated Depreciation	73
CWIP	$ 2
Ownership percentage (in hundredths)	51.00%
NSP-Minnesota | Electric Transmission | Other joint ownership [Domain]
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 11
Accumulated Depreciation	2
CWIP	$ 0
Ownership percentage (in hundredths)	50.00%
NSP-Wisconsin
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 344
Accumulated Depreciation	17
CWIP	2
NSP-Wisconsin | Electric Transmission | CapX2020 Transmission
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	169
Accumulated Depreciation	15
CWIP	$ 2
Ownership percentage (in hundredths)	81.00%
NSP-Wisconsin | Electric Transmission | La Crosse, Wis. to Madison, Wis.
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 175
Accumulated Depreciation	2
CWIP	$ 0
Ownership percentage (in hundredths)	37.00%
PSCo
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 1,590
Accumulated Depreciation	430
CWIP	1
PSCo | Electric Generation | Hayden Unit 1
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	153
Accumulated Depreciation	76
CWIP	$ 0
Ownership percentage (in hundredths)	76.00%
PSCo | Electric Generation | Hayden Unit 2
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 149
Accumulated Depreciation	68
CWIP	$ 0
Ownership percentage (in hundredths)	37.00%
PSCo | Electric Generation | Hayden Common Facilities
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 41
Accumulated Depreciation	21
CWIP	$ 0
Ownership percentage (in hundredths)	53.00%
PSCo | Electric Generation | Craig Units 1 and 2
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 81
Accumulated Depreciation	40
CWIP	$ 0
Ownership percentage (in hundredths)	10.00%
PSCo | Electric Generation | Craig Common Facilities 1, 2 and 3
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 39
Accumulated Depreciation	21
CWIP	$ 0
Ownership percentage (in hundredths)	7.00%
PSCo | Electric Generation | Comanche Unit 3
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 886
Accumulated Depreciation	130
CWIP	$ 0
Ownership percentage (in hundredths)	67.00%
PSCo | Electric Generation | Comanche Common Facilities
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 28
Accumulated Depreciation	3
CWIP	$ 0
Ownership percentage (in hundredths)	82.00%
PSCo | Electric Transmission | Transmission and Other Facilities, including Substations
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 183
Accumulated Depreciation	63
CWIP	1
PSCo | Gas Transportation | Rifle to Avon
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	22
Accumulated Depreciation	7
CWIP	$ 0
Ownership percentage (in hundredths)	60.00%
PSCo | Gas Transportation | Gas Transportation Compressor
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 8
Accumulated Depreciation	1
CWIP	$ 0
Ownership percentage (in hundredths)	50.00%

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Regulatory Assets and Liabilities, Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 464	$ 424
Regulatory Asset, Noncurrent		3,326	3,005
Past expenditures not currently earning a return		178	212
Pension and Retiree Medical Obligations
Regulatory Assets [Line Items]
Regulatory Asset, Current		87	91
Regulatory Asset, Noncurrent		$ 1,500	1,499
Regulatory asset, remaining amortization period		Various
Net AROs
Regulatory Assets [Line Items]
Regulatory Asset, Current	[1]	$ 0	0
Regulatory Asset, Noncurrent	[1]	$ 452	301
Regulatory asset, remaining amortization period		Plant lives
Excess deferred taxes - TCJA
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 0	0
Regulatory Asset, Noncurrent		$ 296	254
Regulatory asset, remaining amortization period		Various
Recoverable Deferred Taxes on AFUDC Recorded in Plant
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 0	0
Regulatory Asset, Noncurrent		$ 264	244
Regulatory asset, remaining amortization period		Plant lives
Environmental Remediation Costs
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 17	16
Regulatory Asset, Noncurrent		$ 155	165
Regulatory asset, remaining amortization period		Various
Depreciation Differences
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 18	20
Regulatory Asset, Noncurrent		$ 107	69
Regulatory Asset Amortization Period, minimum		1 year
Regulatory Asset Amortization Period, maximum		13 years
Benson purchase power agreement termination and asset purchase
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 10	0
Regulatory Asset, Noncurrent		$ 86	0
Regulatory asset, remaining amortization period		10 years
Contract Valuation Adjustments
Regulatory Assets [Line Items]
Regulatory Asset, Current	[2]	$ 17	21
Regulatory Asset, Noncurrent	[2]	$ 77	93
Regulatory asset, remaining amortization period		Term of related contract
Laurentian Energy Authority purchase power agreement termination
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 18	0
Regulatory Asset, Noncurrent		$ 73	0
Regulatory asset, remaining amortization period		5 years
Purchased Power Agreements
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 4	3
Regulatory Asset, Noncurrent		$ 63	67
Regulatory asset, remaining amortization period		Term of related contract
Prairie Island Nuclear Plant Extended Power Uprate
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 3	3
Regulatory Asset, Noncurrent		$ 56	58
Regulatory asset, remaining amortization period		16 years
Losses on Reacquired Debt
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 4	5
Regulatory Asset, Noncurrent		$ 44	48
Regulatory asset, remaining amortization period		Term of related contract
State Commission Adjustments
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 1	1
Regulatory Asset, Noncurrent		$ 29	29
Regulatory asset, remaining amortization period		Plant lives
Conservation Programs
Regulatory Assets [Line Items]
Regulatory Asset, Current	[3]	$ 42	50
Regulatory Asset, Noncurrent	[3]	$ 28	32
Regulatory Asset Amortization Period, minimum		1 year
Regulatory Asset Amortization Period, maximum		2 years
Property Tax
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 14	8
Regulatory Asset, Noncurrent		$ 10	24
Regulatory asset, remaining amortization period		Various
Nuclear Refueling Outage Costs
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 37	49
Regulatory Asset, Noncurrent		$ 14	20
Regulatory Asset Amortization Period, minimum		1 year
Regulatory Asset Amortization Period, maximum		2 years
Deferred Purchased Natural Gas and Electric Energy Costs
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 57	21
Regulatory Asset, Noncurrent		$ 13	13
Regulatory Asset Amortization Period, minimum		1 year
Regulatory Asset Amortization Period, maximum		3 years
Renewable Resources and Environmental Initiatives
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 39	48
Regulatory Asset, Noncurrent		$ 9	10
Regulatory Asset Amortization Period, minimum		1 year
Regulatory Asset Amortization Period, maximum		2 years
Sales True Up and Revenue Decoupling
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 38	37
Regulatory Asset, Noncurrent		$ 7	12
Regulatory Asset Amortization Period, minimum		1 year
Regulatory Asset Amortization Period, maximum		2 years
Gas Pipeline Inspection and Remediation Costs
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 28	24
Regulatory Asset, Noncurrent		$ 3	12
Regulatory Asset Amortization Period, minimum		1 year
Regulatory Asset Amortization Period, maximum		2 years
Other Regulatory Assets
Regulatory Assets [Line Items]
Regulatory Asset, Current		$ 30	27
Regulatory Asset, Noncurrent		$ 40	$ 55
Regulatory asset, remaining amortization period		Various

[1] Includes amounts recorded for future recovery of AROs, less amounts recovered through nuclear decommissioning accruals and gains from decommissioning investments.

[2] Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

[3] Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

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Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[1]	$ 436	$ 239
Regulatory Liability, Noncurrent	[1]	5,187	5,083
Deferred Income Tax Adjustment and TCJA Refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[2]	157	0
Regulatory Liability, Noncurrent	[2]	$ 3,715	3,790
Regulatory liability, remaining amortization period		Various
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 0	0
Regulatory Liability, Noncurrent		$ 1,175	1,131
Regulatory liability, remaining amortization period		Plant lives
Effects of regulation on employee benefit costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[3]	$ 0	0
Regulatory Liability, Noncurrent	[3]	$ 137	46
Regulatory liability, remaining amortization period		Various
Renewable Resources and Environmental Initiatives
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 9	19
Regulatory Liability, Noncurrent		$ 54	60
Regulatory liability, remaining amortization period		Various
Investment Tax Credit Deferrals
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[4]	$ 0	0
Regulatory Liability, Noncurrent	[4]	$ 40	23
Regulatory liability, remaining amortization period		Various
Deferred Electric, Natural Gas and Steam Production Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 102	104
Regulatory Liability, Noncurrent		$ 0	0
Regulatory liability remaining amortization period, maximum		1 year
Contract Valuation Adjustments
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[5]	$ 26	30
Regulatory Liability, Noncurrent	[5]	$ 0	0
Regulatory liability remaining amortization period, maximum		1 year
Conservation Programs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[6]	$ 36	23
Regulatory Liability, Noncurrent	[6]	$ 0	0
Regulatory liability remaining amortization period, maximum		1 year
DOE Settlement
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 19	18
Regulatory Liability, Noncurrent		$ 0	0
Regulatory liability remaining amortization period, maximum		1 year
Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 87	45
Regulatory Liability, Noncurrent		$ 66	33
Regulatory liability, remaining amortization period		Various
Other Current Liabilities
Regulatory Liabilities [Line Items]
Entity's Recorded Provision for Revenue Subject To Refund		$ 29	$ 15

[1] Revenue subject to refund of $29 million and $15 million for 2018 and 2017, respectively, is included in other current liabilities.

[2] Includes the revaluation of recoverable/regulated plant ADIT and revaluation impact of non-plant ADIT due to the TCJA.

[3] Includes regulatory amortization and certain TCJA benefits approved by the CPUC to offset the PSCo prepaid pension asset at Dec. 31, 2018.

[4] Includes impact of lower federal tax rate due to the TCJA.

[5] Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

[6] Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Commercial Paper (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,038	$ 1,038	$ 814
Commercial Paper
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,250	3,250	3,250	$ 2,750
Amount outstanding at period end	1,038	1,038	814	392
Average amount outstanding	500	788	644	485
Maximum amount outstanding	$ 1,038	$ 1,349	$ 1,247	$ 1,183
Weighted average interest rate, computed on a daily basis (percentage)	2.76%	2.34%	1.35%	0.74%
Weighted average interest rate at period end (percentage)	2.97%	2.97%	1.90%	0.95%
364-Day Term Loan | Xcel Energy Inc.
Short-term Debt [Line Items]
Line of Credit Facility, Expiration Period		364 days
Amount outstanding at period end	$ 250	$ 250
364-Day Term Loan | Xcel Energy Inc.
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 500	$ 500

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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Letters of Credit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Amount outstanding at period end	$ 1,038	$ 814
Letter of Credit
Line of Credit Facility [Line Items]
Amount outstanding at period end	$ 49	$ 30
Letter of Credit | Letter of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Period	1 year

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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Credit Facilities (Details)		12 Months Ended
		Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Credit Facilities
Line of Credit Facility [Line Items]
Credit Facility		$ 3,250,000,000
Drawn	[1]	1,087,000,000
Available		$ 2,163,000,000
Xcel Energy Inc. | Credit Facilities
Line of Credit Facility [Line Items]
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent)	[2],[3]	58.00%	58.00%
Credit Facility	[4]	$ 1,500,000,000
Drawn	[1]	488,000,000
Available		1,012,000,000
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased	[3]	$ 200,000,000
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed		65.00%
Line Of Credit Facility Minimum Threshhold Percentage Of Subsidiary Assets To Consolidated Assets Required To Initiate Cross Default Provisions		15.00%
Line of Credit Facility, Minimum Amount of Indebtedness in Default to Initiate Cross Default Provisions		$ 75,000,000
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval	[3],[5]	2
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval		1 year
Debt Instrument, Maturity Date		Jun. 30, 2021
Direct advances on the credit facility outstanding			$ 0
Xcel Energy Inc. | 364-Day Term Loan
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Period		364 days
NSP-Minnesota | Credit Facilities
Line of Credit Facility [Line Items]
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent)	[2]	48.00%	48.00%
Credit Facility	[4]	$ 500,000,000
Drawn	[1]	187,000,000
Available		313,000,000
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased		$ 100,000,000
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed		65.00%
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval	[5]	2
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval		1 year
Direct advances on the credit facility outstanding		$ 0	$ 0
PSCo | Credit Facilities
Line of Credit Facility [Line Items]
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent)	[2]	46.00%	44.00%
Credit Facility	[4]	$ 700,000,000
Drawn	[1]	317,000,000
Available		383,000,000
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased		$ 100,000,000
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed		65.00%
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval	[5]	2
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval		1 year
Direct advances on the credit facility outstanding		$ 0	$ 0
SPS | Credit Facilities
Line of Credit Facility [Line Items]
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent)	[2]	46.00%	46.00%
Credit Facility	[4]	$ 400,000,000
Drawn	[1]	44,000,000
Available		356,000,000
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased		$ 50,000,000
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed		65.00%
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval	[5]	2
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval		1 year
Direct advances on the credit facility outstanding		$ 0	$ 0
NSP-Wisconsin | Credit Facilities
Line of Credit Facility [Line Items]
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent)	[2]	48.00%	47.00%
Credit Facility	[4]	$ 150,000,000
Drawn	[1]	51,000,000
Available		$ 99,000,000
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed		65.00%
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval	[5]	1
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval		1 year
Direct advances on the credit facility outstanding		$ 0	$ 0

[1] Includes outstanding commercial paper, term loan borrowings and letters of credit.

[2] Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.

[3] The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. will be in default on its borrowings under the facility if it or any of its subsidiaries (except NSP-Wisconsin as long as its total assets do not comprise more than 15% of Xcel Energy’s consolidated total assets) default on indebtedness in an aggregate principal amount exceeding $75 million.

[4] These credit facilities mature in June 2021, with the exception of Xcel Energy’s Inc.’s 364-day term loan agreement which expires in December 2019.

[5] All extension requests are subject to majority bank group approval.

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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Long-Term Borrowings and Other Financing Instruments (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2018
Long-Term Borrowings and Other Financing Instruments
Less current maturities	$ 406.0	$ 457.0
Long-term debt, noncurrent	15,803.0	14,520.0
Amount outstanding at period end	1,038.0	814.0
2019	406.0
2020	1,257.0
2021	425.0
2022	902.0
2023	653.0
Proceeds from issuance of common stock	$ 230.0	0.0	$ 0.0
Forward Equity Agreements [Member]
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Maturity Date	Feb. 07, 2020
Common Stock, Value, to be Issued through Forward Equity Agreement				$ 459.0
Common Stock To Be Issued through forward Equity Agreement				9.4
Period End Settlement Price, In Shares	9.4
Period End Settlement Price, in Cash	$ 456.0
Period End Net Cash Settlement Price	$ 24.0
Period End Net Share Settlement Price	0.5
At-the-Market Offering [Member]
Long-Term Borrowings and Other Financing Instruments
Maximum Aggregate Gross Sales Price of Common Stock that Can Be Offered and Sold	$ 4.7
Proceeds from issuance of common stock	224.7
Transaction fees	1.9
DividendReinvestmentProgram [Member]
Long-Term Borrowings and Other Financing Instruments
Proceeds from issuance of common stock	38.5	39.2
Minimum | Forward Equity Agreements [Member]
Long-Term Borrowings and Other Financing Instruments
expected settlement price	450.0
Maximum | Forward Equity Agreements [Member]
Long-Term Borrowings and Other Financing Instruments
expected settlement price	$ 460.0
Senior Unsecured Notes | Series Due June 15, 2028
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	4.00%
Xcel Energy Inc.
Long-Term Borrowings and Other Financing Instruments
Unamortized discount	$ (5.0)	(2.0)
Unamortized debt expense	(21.0)	(20.0)
Less current maturities	2.0	2.0
Long-term debt, noncurrent	3,316.0	2,818.0
Xcel Energy Inc. | Senior Unsecured Notes
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 3,400.0	$ 2,900.0
Debt Instrument, Maturity Date Range, Start	May 15, 2020
Debt Instrument, Maturity Date Range, End	Sep. 15, 2041
Xcel Energy Inc. | Senior Unsecured Notes | Series Due June 15, 2028
Long-Term Borrowings and Other Financing Instruments
Face Amount	$ 500.0
Debt Instrument, Maturity Date	Jun. 15, 2028
Xcel Energy Inc. | Senior Unsecured Notes | Minimum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	2.40%	1.20%
Xcel Energy Inc. | Senior Unsecured Notes | Maximum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.50%
Xcel Energy Inc. | Capital Lease Obligations
Long-Term Borrowings and Other Financing Instruments
Capital Lease Obligations	$ (60.0)	$ (62.0)
Other Subsidiaries
Long-Term Borrowings and Other Financing Instruments
Less current maturities	(1.0)	(2.0)
Long-term debt, noncurrent	25.0	26.0
Other Subsidiaries | Various Eloigne Co. Affordable Housing Project Notes
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 26.0	$ 28.0
Debt Instrument, Maturity Date Range, Start	Sep. 01, 2019
Debt Instrument, Maturity Date Range, End	Dec. 31, 2052
Other Subsidiaries | Various Eloigne Co. Affordable Housing Project Notes | Minimum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	0.00%	0.00%
Other Subsidiaries | Various Eloigne Co. Affordable Housing Project Notes | Maximum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	6.90%	7.05%
NSP-Minnesota
Long-Term Borrowings and Other Financing Instruments
Unamortized discount	$ (21.0)	$ (22.0)
Unamortized debt expense	(42.0)	(45.0)
Less current maturities	0.0	0.0
Long-term debt, noncurrent	4,937.0	4,933.0
NSP-Minnesota | First Mortgage Bonds
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 5,000.0	5,000.0
Debt Instrument, Maturity Date Range, Start	Aug. 15, 2020
Debt Instrument, Maturity Date Range, End	Sep. 15, 2047
NSP-Minnesota | First Mortgage Bonds | Series Due Sept. 15, 2047
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ 600.0
Debt Instrument, Interest Rate, Stated Percentage		3.60%
Debt Instrument, Maturity Date		Sep. 15, 2047
NSP-Minnesota | First Mortgage Bonds | Minimum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	2.15%	2.15%
NSP-Minnesota | First Mortgage Bonds | Maximum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	7.125%	7.125%
NSP-Wisconsin
Long-Term Borrowings and Other Financing Instruments
Unamortized discount	$ (3.0)	$ (3.0)
Unamortized debt expense	(9.0)	(7.0)
Less current maturities	0.0	151.0
Long-term debt, noncurrent	807.0	610.0
NSP-Wisconsin | First Mortgage Bonds
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 800.0	750.0
Debt Instrument, Maturity Date Range, Start	Jun. 15, 2024
Debt Instrument, Maturity Date Range, End	Sep. 01, 2048
NSP-Wisconsin | First Mortgage Bonds | Series Due September 1, 2048 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount	$ 200.0
Debt Instrument, Interest Rate, Stated Percentage	4.20%
Debt Instrument, Maturity Date	Sep. 01, 2048
NSP-Wisconsin | First Mortgage Bonds | Series Due Dec. 1, 2047
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ 100.0
Debt Instrument, Interest Rate, Stated Percentage		3.75%
Debt Instrument, Maturity Date		Dec. 01, 2047
NSP-Wisconsin | First Mortgage Bonds | Minimum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	3.30%	3.30%
NSP-Wisconsin | First Mortgage Bonds | Maximum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
NSP-Wisconsin | City of La Crosse Resource Recovery Bond
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 19.0	$ 19.0
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Debt Instrument, Maturity Date	Nov. 01, 2021
NSP-Wisconsin | Other
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 0.0	$ 2.0
PSCo
Long-Term Borrowings and Other Financing Instruments
Unamortized discount	(14.0)	(13.0)
Unamortized debt expense	(33.0)	(29.0)
Less current maturities	406.0	306.0
Long-term debt, noncurrent	4,592.0	4,303.0
PSCo | First Mortgage Bonds
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 4,900.0	4,500.0
Debt Instrument, Maturity Date Range, Start	Jun. 01, 2019
Debt Instrument, Maturity Date Range, End	Jun. 15, 2048
PSCo | First Mortgage Bonds | Series Due June 15, 2028
Long-Term Borrowings and Other Financing Instruments
Face Amount	$ 350.0
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Debt Instrument, Maturity Date	Jun. 15, 2028
PSCo | First Mortgage Bonds | Series Due June 15, 2048
Long-Term Borrowings and Other Financing Instruments
Face Amount	$ 350.0
Debt Instrument, Interest Rate, Stated Percentage	4.10%
Debt Instrument, Maturity Date	Jun. 15, 2048
PSCo | First Mortgage Bonds | Series Due June 15, 2047
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ 400.0
Debt Instrument, Interest Rate, Stated Percentage		3.80%
Debt Instrument, Maturity Date		Jun. 15, 2047
PSCo | First Mortgage Bonds | Minimum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	2.25%	2.25%
PSCo | First Mortgage Bonds | Maximum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.50%
PSCo | Capital Lease Obligations
Long-Term Borrowings and Other Financing Instruments
Capital Lease Obligations	$ 145.0	$ 151.0
Debt Instrument, Maturity Date Range, Start	Jan. 01, 2025
Debt Instrument, Maturity Date Range, End	Jan. 01, 2060
PSCo | Capital Lease Obligations | Minimum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	11.20%	11.20%
PSCo | Capital Lease Obligations | Maximum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	14.30%	14.30%
SPS
Long-Term Borrowings and Other Financing Instruments
Unamortized discount	$ (4.0)	$ (2.0)
Unamortized debt expense	(20.0)	(18.0)
Less current maturities	0.0	0.0
Long-term debt, noncurrent	2,126.0	1,830.0
SPS | Senior Unsecured Notes
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 350.0	$ 350.0
Debt Instrument, Maturity Date Range, Start	Oct. 01, 2033
Debt Instrument, Maturity Date Range, End	Oct. 01, 2036
SPS | Senior Unsecured Notes | Minimum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
SPS | Senior Unsecured Notes | Maximum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	6.00%	8.75%
SPS | First Mortgage Bonds
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross	$ 1,800.0	$ 1,500.0
Debt Instrument, Maturity Date Range, Start	Jun. 15, 2024
Debt Instrument, Maturity Date Range, End	Jan. 01, 2048
SPS | First Mortgage Bonds | Series Due June 15, 2048
Long-Term Borrowings and Other Financing Instruments
Face Amount	$ 300.0
Debt Instrument, Interest Rate, Stated Percentage	4.40%
Debt Instrument, Maturity Date	Nov. 15, 2048
SPS | First Mortgage Bonds | Series Due August 15, 2047
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ 450.0
Debt Instrument, Interest Rate, Stated Percentage		3.70%
Debt Instrument, Maturity Date		Aug. 15, 2047
SPS | First Mortgage Bonds | Minimum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	3.30%	3.30%
SPS | First Mortgage Bonds | Maximum
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage	4.50%	4.50%

XML

Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Deferred Financing Costs (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Financing Costs [Abstract]
Deferred Finance Costs, Noncurrent, Net	$ 126	$ 119

XML

Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Capital Stock (Details) - $ / shares	Dec. 31, 2018	Jun. 29, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Preferred Stock, Shares Authorized (in shares)	10,000,000
Preferred Stock, Par Value (in dollars per share)	$ 1
Preferred Stock, Shares Outstanding (in shares)	0
Common Stock, Shares Outstanding (in shares)		508,898,420
Xcel Energy Inc.
Debt Instrument [Line Items]
Preferred Stock, Shares Authorized (in shares)	7,000,000
Preferred Stock, Par Value (in dollars per share)	$ 100
Preferred Stock, Shares Outstanding (in shares)	0		0
Common Stock, Shares Authorized (in shares)	1,000,000,000
Common Stock, Par Value (in dollars per share)	$ 2.50
Common Stock, Shares Outstanding (in shares)	514,036,787		507,762,881
PSCo
Debt Instrument [Line Items]
Preferred Stock, Shares Authorized (in shares)	10,000,000
Preferred Stock, Par Value (in dollars per share)	$ 0.01
Preferred Stock, Shares Outstanding (in shares)	0		0
SPS
Debt Instrument [Line Items]
Preferred Stock, Shares Outstanding (in shares)			0

XML

Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Dividend and Other Capital-Related Restrictions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
PSCo
Debt Instrument [Line Items]
Maximum additional long term debt authorized for issuance	$ 1,100.0
Maximum additional short term debt authorized for issuance	$ 800.0
NSP-Minnesota
Debt Instrument [Line Items]
Equity to total capitalization ratio, low end of range (in hundredths)	47.10%
Equity to total capitalization ratio, high end of range (in hundredths)	57.50%
Equity to total capitalization ratio	52.30%
Unrestricted Retained Earnings Per State Regulatory Commissions Dividend Restrictions	$ 1,000.0
Capitalization, Short term debt, long term debt and equity	10,700.0
Maximum total capitalization	11,500.0
Maximum additional short term debt authorized for issuance	$ 1,725.0
Maximum Percentage of long term debt to total capitalization	5293000.00%
Maximum percentage of short term debt to total capitalization (in hundredths)	15.00%
NSP-Wisconsin
Debt Instrument [Line Items]
Minimum calendar year average equity to total capitalization ratio authorized by state commission	51.50%
Equity to total capitalization ratio	51.80%
Unrestricted Retained Earnings Per State Regulatory Commissions Dividend Restrictions	$ 11.5	[1]
Capitalization, Short term debt, long term debt and equity	1,700.0
Maximum annual dividends that can be paid if equity capitalization ratio condition is not met	55.0
Maximum additional long term debt authorized for issuance	0.0	[2]
Maximum additional short term debt authorized for issuance	$ 150.0
SPS
Debt Instrument [Line Items]
Equity to total capitalization ratio (excluding short-term debt), low end of range (in hundredths)	45.00%	[3]
Equity to total capitalization ratio (excluding short-term debt), high end of range (in hundredths)	55.00%	[3]
Equity to total capitalization ratio (excluding short-term debt) (in hundredths)	54.40%	[3]
Unrestricted Retained Earnings Per State Regulatory Commissions Dividend Restrictions	$ 605.7	[4]
Capitalization, Short term debt, long term debt and equity	4,700.0
Maximum additional long term debt authorized for issuance	0.0	[2]
Maximum additional short term debt authorized for issuance	$ 600.0

[1] NSP-Wisconsin cannot pay annual dividends in excess of approximately $55 million if its average equity-to-total capitalization ratio falls below the commission authorized level.

[2] SPS and NSP-Wisconsin will file for additional long-term debt authorization.

[3] SPS excludes short-term debt.

[4] SPS may not pay a dividend that would cause it to lose its investment grade bond rating.

XML

Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 2,880	$ 3,048	$ 2,658	$ 2,951	$ 2,796	$ 3,017	$ 2,645	$ 2,946	$ 11,537	$ 11,404	$ 11,107
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									11,020
Retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									9,508
Retail | Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									3,945
Retail | Commercial and industrial (C&I)
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									5,423
Retail | Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									140
Wholesale
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									791
Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									523
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									198
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Total operating revenues									517
Regulated Electric | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									9,339
Regulated Electric | Retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									7,927
Regulated Electric | Retail | Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									2,919
Regulated Electric | Retail | Commercial and industrial (C&I)
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									4,874
Regulated Electric | Retail | Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									134
Regulated Electric | Wholesale
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									791
Regulated Electric | Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									523
Regulated Electric | Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									98
Regulated Electric | Alternative revenue and other
Disaggregation of Revenue [Line Items]
Total operating revenues									380
Regulated Natural Gas | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,612
Regulated Natural Gas | Retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,512
Regulated Natural Gas | Retail | Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									988
Regulated Natural Gas | Retail | Commercial and industrial (C&I)
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									524
Regulated Natural Gas | Retail | Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									0
Regulated Natural Gas | Wholesale
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									0
Regulated Natural Gas | Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									0
Regulated Natural Gas | Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									100
Regulated Natural Gas | Alternative revenue and other
Disaggregation of Revenue [Line Items]
Total operating revenues									127
All Other | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									69
All Other | Retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									69
All Other | Retail | Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									38
All Other | Retail | Commercial and industrial (C&I)
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									25
All Other | Retail | Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									6
All Other | Wholesale
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									0
All Other | Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									0
All Other | Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									0
All Other | Alternative revenue and other
Disaggregation of Revenue [Line Items]
Total operating revenues									10
Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues									11,537
Operating Segments | Regulated Electric
Disaggregation of Revenue [Line Items]
Total operating revenues									9,719
Operating Segments | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Total operating revenues									1,739
Operating Segments | All Other
Disaggregation of Revenue [Line Items]
Total operating revenues									$ 79

XML

Income Taxes (Details) - USD ($)		1 Months Ended	3 Months Ended				12 Months Ended
		Dec. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2015	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal Tax Reform [Abstract]
Tax Cuts and Jobs Act of 2017, Corporate Federal Tax Rate		21.00%					21.00%
Tax Cuts and Jobs Act of 2017, Net Operating Loss Deduction Limitation, Percent of Taxable income							80.00%
Reclassification of deferred taxes to regulatory liabilities, grossed-up for taxes								$ 3,800,000,000
Regulatory liability, customer refunds, weighted average period								30 years
Provisional income tax expense for tax reform								$ 23,000,000
Federal Tax Loss Carryback Claims [Abstract]
Number Of Years Of Tax Loss Carryback Period							two
Tax Adjustments, Settlements, and Unusual Provisions												$ 5,000,000	$ 17,000,000	$ 12,000,000	$ 15,000,000
Tax Audits [Abstract]
Unrecognized Tax Benefits, Interest on Income Taxes Accrued																$ 0	$ 0	$ (3,000,000)	$ 0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued							$ 0	(3,000,000)		$ 3,000,000
Unrecognized Tax Benefits [Abstract]
Unrecognized tax benefit — Permanent tax positions																28,000,000	20,000,000
Unrecognized tax benefit — Temporary tax positions																9,000,000	19,000,000
Total unrecognized tax benefit		$ 39,000,000	$ 37,000,000				39,000,000	134,000,000		121,000,000		121,000,000				37,000,000	39,000,000	134,000,000	$ 121,000,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at Jan. 1							39,000,000	134,000,000		121,000,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions							9,000,000	6,000,000		8,000,000
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions							(4,000,000)	(4,000,000)		0
Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions							2,000,000	15,000,000		10,000,000
Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions							(4,000,000)	(105,000,000)		(5,000,000)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities							(5,000,000)	(7,000,000)		0
Balance at Dec. 31		$ 39,000,000	$ 37,000,000				$ 37,000,000	$ 39,000,000		$ 134,000,000		$ 121,000,000
Tax Benefits Associated With NOL And Tax Credit Carryforwards [Abstract]
NOL and tax credit carryforwards																(35,000,000)	(31,000,000)
Net Deferred Tax Liability associated with the Unrecognized Tax Benefit Amounts and Related NOLs and Tax Credit Carryforwards																(24,000,000)	(13,000,000)
Upper bound of decrease in unrecognized tax benefit that is reasonably possible																28,000,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued																0	0	$ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent							21.00%	35.00%	[1]	35.00%	[1]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent							5.00%	4.10%	[1]	4.10%	[1]
Effective Income Tax Rate Reconciliation, Tax Credit, Percent							(5.20%)	(4.70%)	[1]	(3.40%)	[1]
Effective Income Tax Rate Reconciliation Regulatory Differences Utility Plant Items, Percent							(2.00%)	(1.00%)	[1]	(0.80%)	[1]
Tax reform, Percent	[2]						0.60%	0.00%	[1]	0.00%	[1]
Regulatory differences - effects of rate changes, Percent	[3]						(5.80%)	(0.10%)	[1]	(0.10%)	[1]
Regulatory differences - other utility plant items, Percent							(1.00%)	(0.70%)	[1]	(0.50%)	[1]
Effective Income Tax Rate Reconciliation Change In Unrecognized Tax Benefits, Percent							0.40%	(0.60%)	[1]	0.20%	[1]
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent							0.00%	1.40%	[1]	0.00%	[1]
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent							(0.40%)	(1.30%)	[1]	(0.40%)	[1]
Effective Income Tax Rate Reconciliation, Percent							12.60%	32.10%	[1]	34.10%	[1]
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)							$ (34,000,000)	$ 1,000,000		$ (3,000,000)
Current State and Local Tax Expense (Benefit)							8,000,000	(11,000,000)		(4,000,000)
Current Change In Unrecognized Tax Expense (Benefit)							(6,000,000)	(83,000,000)		6,000,000
Deferred Federal Income Tax Expense (Benefit)							122,000,000	460,000,000		477,000,000
Deferred State and Local Income Tax Expense (Benefit)							85,000,000	107,000,000		112,000,000
Deferred Change In Unrecognized Tax Expense (Benefit)							11,000,000	73,000,000		(2,000,000)
Deferred investment tax credits							(5,000,000)	(5,000,000)		(5,000,000)
Income Tax Expense (Benefit)							181,000,000	542,000,000		581,000,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred tax expense (benefit) excluding selected items							320,000,000	(2,939,000,000)		631,000,000
Amortization and adjustments to deferred income taxes on income tax regulatory assets and liabilities							(102,000,000)	3,583,000,000		(45,000,000)
Other Comprehensive Income (Loss), Tax							0	(4,000,000)		1,000,000
Deferred Income Tax Expense (Benefit)							$ 218,000,000	640,000,000		$ 587,000,000
Deferred Tax Liabilities, Gross [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment																5,082,000,000	4,960,000,000
Deferred Tax Liabilities, Regulatory Assets																599,000,000	565,000,000
Pension expense																178,000,000	199,000,000
Deferred Tax Liabilities, Other																64,000,000	57,000,000
Deferred Tax Liabilities, Gross																5,923,000,000	5,781,000,000
Deferred Tax Assets, Gross [Abstract]
Deferred Tax Assets Regulatory Liabilities																879,000,000	886,000,000
Deferred Tax Assets Tax credit carryforward																642,000,000	607,000,000
Deferred Tax Assets, Operating Loss Carryforwards																51,000,000	293,000,000
Deferred Tax Assets, Valuation Allowance																(79,000,000)	(77,000,000)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits																124,000,000	132,000,000
Deferred Tax Assets Deferred Investment Tax Credits																16,000,000	17,000,000
Deferred Tax Assets Rate Refund																60,000,000	10,000,000
Deferred Tax Assets, Other																65,000,000	68,000,000
Deferred Tax Assets, Net of Valuation Allowance																1,758,000,000	1,936,000,000
Deferred Tax Liabilities, Net																4,165,000,000	3,845,000,000
Internal Revenue Service (IRS)
Tax Audits [Abstract]
Operating Loss Carryforwards																0	1,072,000,000
Tax Credit Carryforward, Amount																553,000,000	517,000,000
Tax Credit Carryforward, Valuation Allowance																(5,000,000)	(5,000,000)
Carryforward expiration date range, low							2021
Carryforward expiration date range, high							2038
Tax years under examination, Concluded					2012 and 2013
Tax years under examination			2014 - 2016			2012 and 2013									2010 and 2011
Year of carryback claim under examination															2009
Potential Tax Adjustments			$ 0
Colorado
Tax Audits [Abstract]
Earliest year subject to examination							2009
Minnesota
Tax Audits [Abstract]
Tax years under examination, Concluded			2010 - 2014
Earliest year subject to examination							2009
Potential Tax Adjustments				$ 0
Texas
Tax Audits [Abstract]
Earliest year subject to examination							2010
Wisconsin
Tax Audits [Abstract]
Tax years under examination, Concluded				2012 - 2013
Earliest year subject to examination							2014
Tax years under examination			2014 - 2016
Potential Tax Adjustments			$ 0	$ 0
State and Local Jurisdiction
Tax Audits [Abstract]
Operating Loss Carryforwards																1,104,000,000	1,592,000,000
Operating Loss Carryforwards, Valuation Allowance																(50,000,000)	(55,000,000)
Tax Credit Carryforward Net Of Federal Detriment	[4]															89,000,000	90,000,000
Valuation Allowance for Tax Credit Carryforward Net of Federal Benefit	[5]															(69,000,000)	(68,000,000)
Federal detriment																24,000,000	24,000,000
Federal Benefit																$ 18,000,000	$ 18,000,000
Carryforward expiration date range, low							2019
Carryforward expiration date range, high							2037
Plant Related Regulatory Liability [Member]
Federal Tax Reform [Abstract]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Regulatory Liability, Provisional Income Tax (Expense) Benefit								2,700,000,000
Non-Plant Related Regulated Liability [Member]
Federal Tax Reform [Abstract]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Regulatory Liability, Provisional Income Tax (Expense) Benefit								174,000,000
Non-Plant Related Regulatory Asset [Member]
Federal Tax Reform [Abstract]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Regulatory Asset, Provisional Income Tax Expense (Benefit)								$ 254,000,000

[1] Prior periods have been reclassified to conform to current year presentation.

[2] ARAM has been deferred when regulatory treatment has not been established. As Xcel Energy received direction from its regulatory commissions regarding the return of excess deferred taxes to customers, the ARAM deferral was reversed. This resulted in a reduction to tax expense with a corresponding reduction to revenue.

[3] ARAM is a method to flow back excess deferred taxes to customers.

[4] State tax credit carryforwards are net of federal detriment of $24 million as of Dec. 31, 2018 and 2017.

[5] Valuation allowances for state tax credit carryforwards were net of federal benefit of $18 million as of Dec. 31, 2018 and 2017.

XML

Share-Based Compensation, Restricted Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Instruments Other than Options Activity [Roll Forward]
Balance at January 1 (in shares)	995
Granted (in shares)	500	503	522
Vested (in shares)	(475)	(467)	(530)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	(126)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share)	$ 41.74
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 23,393	$ 22,459	$ 21,575
Dividend equivalents (in shares)	45
Balance at December 31 (in shares)	939	995
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Abstract]
Balance at January 1, weighted average grant date fair value (in dollars per share)	$ 38.48
Granted, weighted average grant date fair value (in dollars per share)	47.60	$ 41.02	$ 36.00
Vested, weighted average grant date fair value (in dollars per share)	35.92
Dividend equivalents, weighted average grant date fair value (in dollars per share)	40.74
Balance at December 31, weighted average grant date fair value (in dollars per share)	$ 44.30	$ 38.48
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Award Vesting Period (in years)	3 years
Restricted Stock [Member]
Equity Instruments Other than Options Activity [Roll Forward]
Balance at January 1 (in shares)	44
Granted (in shares)	18	15	20
Vested (in shares)	(27)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share)	$ 0.00
Dividend equivalents (in shares)	1
Balance at December 31 (in shares)	36	44
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Abstract]
Balance at January 1, weighted average grant date fair value (in dollars per share)	$ 39.71
Granted, weighted average grant date fair value (in dollars per share)	44.68	$ 42.00	$ 38.82
Vested, weighted average grant date fair value (in dollars per share)	37.25
Dividend equivalents, weighted average grant date fair value (in dollars per share)	46.27
Balance at December 31, weighted average grant date fair value (in dollars per share)	$ 44.29	$ 39.71
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Award Vesting Period (in years)	3 years
Service-based awards [Member]
Equity Instruments Other than Options Activity [Roll Forward]
Granted (in shares)	300	300	300

XML

Share-Based Compensation, Other Equity Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Instruments Other than Options Activity [Roll Forward]
Balance at January 1 (in shares)	995
Granted (in shares)	500	503	522
Forfeited (in shares)	(126)
Vested (in shares)	(475)	(467)	(530)
Dividend equivalents (in shares)	45
Balance at December 31 (in shares)	939	995
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Abstract]
Balance at January 1, weighted average grant date fair value (in dollars per share)	$ 38.48
Granted, weighted average grant date fair value (in dollars per share)	47.60	$ 41.02	$ 36.00
Forfeited, weighted average grant date fair value (in dollars per share)	41.74
Vested, weighted average grant date fair value (in dollars per share)	35.92
Dividend equivalents, weighted average grant date fair value (in dollars per share)	40.74
Balance at December 31, weighted average grant date fair value (in dollars per share)	$ 44.30	$ 38.48
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Award Vesting Period (in years)	3 years
Total fair value of equity awards vested during the period	$ 23,393	$ 22,459	$ 21,575
Performance-based awards [Member]
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Award Vesting Period (in years)	3 years
Service-based awards [Member]
Equity Instruments Other than Options Activity [Roll Forward]
Granted (in shares)	300	300	300
Xcel Energy Inc. 2015 Omnibus Incentive Plan [Member] | Service-based awards [Member]
Equity Instruments Other than Options Activity [Roll Forward]
Granted (in shares)	7,000
Equity Award Granted Between 2014 and 2017 | Performance-based awards [Member] | Minimum
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Percentage payout for performance-based equity awards	0.00%
Equity Award Granted Between 2014 and 2017 | Performance-based awards [Member] | Maximum
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Percentage payout for performance-based equity awards	200.00%
Xcel Energy Inc. Long Term Incentive Plan [Member] | Service-based awards [Member]
Equity Instruments Other than Options Activity [Roll Forward]
Granted (in shares)	8,300
Xcel Energy Inc. Executive Annual Incentive Award Plan [Member] | Service-based awards [Member]
Equity Instruments Other than Options Activity [Roll Forward]
Granted (in shares)	1,200

XML

Share-Based Compensation, Stock Equivalent Unit Plan (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Instruments Other than Options Activity [Roll Forward]
Balance at January 1 (in shares)	995,000
Granted (in shares)	500,000	503,000	522,000
Dividend equivalents (in shares)	45,000
Balance at December 31 (in shares)	939,000	995,000
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Abstract]
Balance at January 1, weighted average grant date fair value (in dollars per share)	$ 38.48
Granted, weighted average grant date fair value (in dollars per share)	47.60	$ 41.02	$ 36.00
Dividend equivalents, weighted average grant date fair value (in dollars per share)	40.74
Balance at December 31, weighted average grant date fair value (in dollars per share)	$ 44.30	$ 38.48
Stock Equivalent Units [Member]
Equity Instruments Other than Options Activity [Roll Forward]
Balance at January 1 (in shares)	753,000
Granted (in shares)	36,000	51,000	49,000
Units distributed (in shares)	(123,000)
Dividend equivalents (in shares)	22,000
Balance at December 31 (in shares)	688,000	753,000
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Abstract]
Balance at January 1, weighted average grant date fair value (in dollars per share)	$ 29.83
Granted, weighted average grant date fair value (in dollars per share)	45.44	$ 46.05	$ 40.68
Units distributed, weighted average grant date fair value (in dollars per share)	31.21
Dividend equivalents, weighted average grant date fair value (in dollars per share)	46.40
Balance at December 31, weighted average grant date fair value (in dollars per share)	$ 30.93	$ 29.83
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Number of shares of common stock into which the share-based compensation can be converted (in shares)	1

XML

Share-Based Compensation, TSR Liability Awards (Details) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Parties shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Equity Instruments Other than Options Activity [Roll Forward]
Granted (in shares)	500	503	522
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Award Vesting Period (in years)	3 years
Number of Utilities in Peer Group | Parties	22
TSR Liability Awards
Equity Instruments Other than Options Activity [Roll Forward]
Granted (in shares)	239	240	264
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Award Vesting Period (in years)	3 years
Amount of cash used to settle TSR liability awards | $	$ 8,000
Awards settled (in shares)	482	454	354
Settlement amount (cash and common stock) | $	$ 21,534	$ 19,083	$ 13,724
TSR Liability Awards | Minimum
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Percentage payout for TSR liability awards	0.00%
TSR Liability Awards | Maximum
Equity Instruments Other than Options, Additional Disclosures [Abstract]
Percentage payout for TSR liability awards	200.00%

XML

Share-Based Compensation, Share-Based Compensation Expense (Details) - USD ($) shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-Based Compensation Expense [Abstract]
Granted (in shares)		500	503	522
Compensation cost for share-based awards	[1]	$ 45	$ 57	$ 41
Tax benefit recognized in income		12	22	$ 16
Unrecognized compensation cost related to nonvested share-based compensation awards		$ 38	$ 44
Weighted-average period for recognition of unrecognized compensation cost related to nonvested share-based compensation awards (in years)		1 year 7 months
Award Vesting Period (in years)		3 years
Service-based awards [Member]
Share-Based Compensation Expense [Abstract]
Granted (in shares)		300	300	300

[1] Compensation costs for share-based payment are included in O&M expense.

XML

Earnings Per Share (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effect of dilutive securities [Abstract]
401(k) equity awards (in shares)	0.5	0.6	0.7

XML

Fair Value of Financial Assets and Liabilities, Cost and Fair Value of Nuclear Decommissioning Fund (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Gross Unrealized Gain		$ 450		$ 560
Available-for-sale Securities, Gross Unrealized Loss		45		7
Decommissioning Fund Investments, Fair Value		2,055
Investments [Abstract]
Investment in subsidiaries		141		140
Miscellaneous investments		121		114
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		24	[1]	29
Alternative Investment		819	[1]	659
Available-for-sale Securities				2,143
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investment		0	[1]	0
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Commingled Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AvailableForSaleSecuritiesCommingledFunds	[2]			882
Alternative Investment		819	[1]	659	[2]
Available-for-sale Securities	[1]	898
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investment		0	[1]	0	[2]
Debt Securities, Available-for-sale		436	[1]	441	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investment		0	[1]	0	[2]
Available-for-sale Securities, Equity Securities		697	[1]	791	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		24	[1]	29
Available-for-sale Securities		800	[1]	1,043
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Commingled Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AvailableForSaleSecuritiesCommingledFunds	[2]			223
Available-for-sale Securities	[1]	79
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Equity Securities		697	[1]	791	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0	[1]	0
Available-for-sale Securities		436	[1]	441
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Commingled Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AvailableForSaleSecuritiesCommingledFunds	[2]			0
Available-for-sale Securities	[1]	0
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		436	[1]	441	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Equity Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0	[1]	0
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Commingled Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AvailableForSaleSecuritiesCommingledFunds	[2]			0
Available-for-sale Securities	[1]	0
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Equity Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		24	[1]	29	[2]
Available-for-sale Securities		1,649	[1]	1,591
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Commingled Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AvailableForSaleSecuritiesCommingledFunds	[2]			701
Available-for-sale Securities	[1]	758
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		466	[1]	438	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Equity Securities		$ 401	[1]	$ 423	[2]

[1] orted in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $141 million of equity investments in unconsolidated subsidiaries and $121 million of rabbi trust assets and miscellaneous investments. Dec. 31, 2017 Fair Value(Millions of Dollars) Cost Level 1 Level 2 Level 3 NAV TotalNuclear decommissioning fund (a) Cash equivalents $29 $29 $— $— $— $29Commingled funds 701 223 — — 659 882Debt securities 438 — 441 — — 441Equity securities 423 791 — — — 791Total $1,591 $1,043 $441 $— $659 $2,143

[2] During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

XML

Fair Value of Financial Assets and Liabilities Fair Value of Financial Assets and Liabilities, Cost and Fair Value of Rabbi Trusts (Details) - Fair Value Measured on a Recurring Basis - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Cost
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	$ 68	$ 59
Cost | Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[1]	16	12
Cost | Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	52	47
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	67	62
Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	67	62
Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		0	0
Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	0	0
Fair Value | Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[1]	16	12
Fair Value | Rabbi Trust [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[1]	16	12
Fair Value | Rabbi Trust [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[1]	0	0
Fair Value | Rabbi Trust [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[1]	0	0
Fair Value | Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	51	50
Fair Value | Mutual Funds [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	51	50
Fair Value | Mutual Funds [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	0	0
Fair Value | Mutual Funds [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	[1]	$ 0	$ 0

[1] d in nuclear decommissioning fund and other investments on the consolidated balance sheet.

XML

Fair Value of Financial Assets and Liabilities, Final Contractual Maturity Dates of Debt Securities in Nuclear Decommissioning Fund (Details) $ in Millions	Dec. 31, 2018 USD ($)
Final Contractual Maturity [Abstract]
Due in 1 Year or Less	$ 10
Due in 1 to 5 Years	107
Due in 5 to 10 Years	211
Due after 10 Years	108
Total	$ 436

XML

Fair Value of Financial Assets and Liabilities, Derivative Instruments (Details) MWh in Millions, MMBTU in Millions, $ in Millions		Dec. 31, 2018 USD ($) MMBTU MWh Counterparty	Dec. 31, 2017 MMBTU MWh
Credit Concentration Risk
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty		10
Credit Concentration Risk | Municipal or Cooperative Entities or Other Utilities [Member]
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty		8
Credit Concentration Risk | External Credit Rating, Investment Grade [Member]
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty		6
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties | $		$ 96
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		43.00%
Credit Concentration Risk | No Investment Grade Ratings from External Credit Rating Agencies [Member]
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty		3
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties | $		$ 20
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		9.00%
Credit Concentration Risk | Internal Noninvestment Grade [Member]
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty		1
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties | $		$ 12
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		5.00%
Interest Rate Swap
Interest Rate Derivatives [Abstract]
Amount of accumulated other comprehensive gains (losses) related to interest rate derivatives expected to be reclassified into earnings within the next twelve months | $		$ (3)
Derivative Liability, Notional Amount | $		$ 300
Electric Commodity (in megawatt hours)
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]
Derivative, Nonmonetary Notional amount | MWh	[1],[2]	87	68
Natural Gas Commodity (in million British thermal units)
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]
Derivative, Nonmonetary Notional amount | MMBTU	[1],[2]	92	37

[1] Amounts are not reflective of net positions in the underlying commodities.

[2] Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

XML

Fair Value of Financial Assets and Liabilities, Financial Impact of Qualifying Cash Flow Hedges (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial Impact of Qualifying Cash Flow Hedges on Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss related to cash flow hedges at Jan. 1		$ (58)	$ (51)	$ (55)
After-tax net unrealized losses related to derivatives accounted for as hedges		(5)	0	0
After-tax net realized losses on derivative transactions reclassified into earnings		3	3	4
Adoption of ASU. 2018-02 (a)	[1]	0	(10)	0
Accumulated other comprehensive loss related to cash flow hedges at Dec. 31		$ (60)	$ (58)	$ (51)

[1] In 2017, Xcel Energy implemented ASU No. 2018-02 related to TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.

XML

Fair Value of Financial Assets and Liabilities, Impact of Derivative Activity (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial Impact of Qualifying Fair Value Hedges on Earnings [Abstract]
Fair Value Hedges, Net		$ 0	$ 0	$ 0
Designated as Hedging Instrument | Cash Flow Hedges
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		(7,000,000)
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		0
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		4,000,000	5,000,000	6,000,000
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0	0
Pre-tax gains (losses) recognized during the period in income		0	0	0
Designated as Hedging Instrument | Cash Flow Hedges | Interest Rate
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		(7,000,000)
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		0
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss	[1]	4,000,000	5,000,000	6,000,000
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0	0
Pre-tax gains (losses) recognized during the period in income		0	0	0
Other Derivative Instruments
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0	0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		11,000,000	(3,000,000)	18,000,000
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		0	0	0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		(7,000,000)	(12,000,000)	7,000,000
Pre-tax gains (losses) recognized during the period in income		10,000,000	4,000,000	(6,000,000)
Other Derivative Instruments | Commodity Trading
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		0	0	0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0	0
Pre-tax gains (losses) recognized during the period in income	[2]	14,000,000	10,000,000	2,000,000
Other Derivative Instruments | Electric Commodity
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0	0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		1,000,000	10,000,000	17,000,000
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		0	0	0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)	[3]	(1,000,000)	(15,000,000)	(8,000,000)
Pre-tax gains (losses) recognized during the period in income		0	0	0
Other Derivative Instruments | Natural Gas Commodity
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0	0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		10,000,000	(13,000,000)	1,000,000
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		0	0	0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)	[4]	(6,000,000)	3,000,000	15,000,000
Pre-tax gains (losses) recognized during the period in income	[4]	(4,000,000)	$ (6,000,000)	$ (8,000,000)
Other Derivative Instruments | Natural Gas Commodity for Electric Generation
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		$ 0

[1] Amounts recorded to interest charges.

[2] Amounts recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.

[3] Amounts recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate

[4] Amounts for the year ended Dec. 31, 2018 included $1 million of settlement losses on derivatives entered to mitigate natural gas price risk for electric generation recorded to electric fuel and purchased power, subject to cost-recovery mechanisms and reclassified to a regulatory asset, as appropriate. Such gains and losses for the years ended Dec. 31, 2017 and 2016 were immaterial. Remaining settlement losses for the years ended Dec. 31, 2018, 2017 and 2016 related to natural gas operations and were recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

XML

Fair Value of Financial Assets and Liabilities, Credit Related Contingent Features (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Derivative instruments in a gross liability position	$ 0	$ 0
Collateral posted related to adequate assurance clauses in derivative contracts	$ 0	$ 0

XML

Fair Value of Financial Assets and Liabilities, Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		$ 32		$ 0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		15		3
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		87		44
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		61		29
Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		34		48
Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		129		126
Fair Value Measured on a Recurring Basis | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		83		39
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(44)		(17)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		54		9
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(44)		(15)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		25		30
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	0		(2)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		4		0
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	0		0
Fair Value Measured on a Recurring Basis | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		41		6
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	(60)		(17)
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	0		0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		34		5
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	(60)		(15)
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	0		(2)
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	0		0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		18		29
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(14)		(7)
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		18		29
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(14)		(7)
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		36		14
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	17		(10)
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		36		14
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		17	[2]	(10)
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		4		2
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		4		2
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		4		2
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		4		2
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		96		22
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		92		22
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		4		0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		95		19
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		88		18
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		1
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		27		31
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		27		31
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		18		24
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		18		24
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		27		32
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		2		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		25		32
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		2		2
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		2		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		2
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5		5
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5		5
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		1		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		1		0
Fair Value, Measurements, Nonrecurring | Other Current Assets | Purchased Power Agreements
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[2]	4		5
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | Purchased Power Agreements
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	20		23
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | Purchased Power Agreements
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[2]	16		19
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | Purchased Power Agreements
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	93		112
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		127		56
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		98		24
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		25		32
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		4		0
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		101		23
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		94		20
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		2
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		1
Fair Value | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		32		36
Fair Value | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		32		36
Fair Value | Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		19		24
Fair Value | Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		19		24
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		7		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		7		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Cash Flow Hedges | Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 7		$ 0

[1] During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

[2] Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements as of Dec. 31, 2018 and 2017. At Dec. 31, 2018 and 2017, derivative assets and liabilities include $32 million and $0 million of obligations to return cash collateral, respectively. At Dec. 31, 2018 and 2017, derivative assets and liabilities include rights to reclaim cash collateral of $15 million and $3 million, respectively. Counterparty netting excludes settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

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Fair Value of Financial Assets and Liabilities, Changes in Level 3 Commodity Derivatives (Details) - Commodity Contract - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period		$ 35,000,000	$ 17,000,000	$ 18,000,000
Purchases		59,000,000	82,000,000	35,000,000
Settlements		(59,000,000)	(97,000,000)	(89,000,000)
(Losses) gains recognized in earnings	[1]	(1,000,000)	5,000,000	0
Gains (losses) recognized as regulatory assets and liabilities		(5,000,000)	28,000,000	53,000,000
Balance at end of period		29,000,000	35,000,000	17,000,000
Transfers into Level 3		0	0	0
Transfers out of Level 3		$ 0	$ 0	$ 0

[1] Amounts relate to commodity derivatives held at the end of the period.

XML

Fair Value of Financial Assets and Liabilities, Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Carrying Amount
Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including current portion	$ 16,209	$ 14,977
Fair Value
Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including current portion	$ 16,755	$ 16,531

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Benefit Plans and Other Postretirement Benefits, Pension Benefits (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Supplemental Executive Retirement Plan (SERP) and Nonqualified Pension Plan
Pension Benefits [Abstract]
Total benefit obligation			$ 33		$ 37
Net benefit cost recognized for financial reporting			4		5
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount			2,742	[1]	3,088	[1]	$ 2,856
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	[1]		957		1,076
Pension Benefits [Abstract]
Total benefit obligation			3,477		3,828		3,682
Net benefit cost recognized for financial reporting			$ 140		$ 139		$ 122
Minimum number of years historical achieved weighted average annual returns are used to determine investment return assumptions (in years)			20 years
Expected average long-term rate of return on assets (as a percent)			6.87%		6.87%		6.87%
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			100.00%		100.00%
Pension Plan [Member] | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount			$ 106		$ 114	[1]
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets			$ 0		$ 0	[1]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			36.00%		36.00%
Pension Plan [Member] | Long-duration fixed income and interest rate swap securities
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			30.00%		27.00%
Pension Plan [Member] | Short-to-intermediate fixed income securities
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			17.00%		20.00%
Pension Plan [Member] | Alternative investments
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			15.00%		15.00%
Pension Plan [Member] | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]		$ 137		$ 196
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	[1]		$ 0		$ 0
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			2.00%		2.00%
Forecast | Pension Plan [Member]
Pension Benefits [Abstract]
Expected average long-term rate of return on assets for next fiscal year (as a percent)		6.87%

[1] (a) See Note 10 for further information regarding fair value measurement inputs and methods.

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Benefit Plans and Other Postretirement Benefits, Fair Value of Pension Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		$ 2,742	[1]	$ 3,088	[1]	$ 2,856
Plan assets at net asset value	[1]	957		1,076
Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	1,159		1,335
Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	626		677
Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Cash equivalents
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	137		196
Plan assets at net asset value	[1]	0		0
Cash equivalents | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	137		196
Cash equivalents | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Cash equivalents | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Other
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	(23)		(24)
Plan assets at net asset value	[1]	(30)		1
Other | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	2		(29)
Other | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	5		4
Other | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Commingled Funds
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		1,901		2,129	[1]
Plan assets at net asset value		987		1,075	[1]
Commingled Funds | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		914		1,054	[1]
Commingled Funds | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[1]
Commingled Funds | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[1]
Debt Securities
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		621		673	[1]
Plan assets at net asset value		0		0	[1]
Debt Securities | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[1]
Debt Securities | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		621		673	[1]
Debt Securities | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[1]
Equity Securities
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		106		114	[1]
Plan assets at net asset value		0		0	[1]
Equity Securities | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		106		114	[1]
Equity Securities | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[1]
Equity Securities | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		$ 0		$ 0	[1]

[1] (a) See Note 10 for further information regarding fair value measurement inputs and methods.

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Benefit Plans and Other Postretirement Benefits, Pension Plan Benefit Obligations, Cash Flows and Benefit Costs (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jan. 31, 2019		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Payment for Settlement			$ 198		$ 174
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Settlement Charge Recognized in Operating and Maintenance Expenses			2,352		2,270		$ 2,300
Significant Assumptions Used to Measure Costs [Abstract]
Liability, Defined Benefit Plan, Noncurrent			994		1,042
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation at Dec. 31			3,275		3,612
Change in Projected Benefit Obligation [Roll Forward]
Obligation at Jan. 1	$ 3,477		3,828		3,682
Service cost			94		94		92
Interest cost			133		147		160
Plan amendments			0		(13)
Actuarial loss			(224)		259
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant			0		0
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt			0		0
Benefit payments			(354)		(341)
Obligation at Dec. 31			3,477		3,828		3,682
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at Jan. 1	2,742	[1]	3,088	[1]	2,856
Actual return (loss) on plan assets			(142)		411
Employer contributions			150		162
Benefit payments			(354)		(341)
Fair value of plan assets at Dec. 31			2,742	[1]	3,088	[1]	2,856
Funded Status of Plans at Dec. 31 [Abstract]
Funded status			(735)		(740)
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]
Net loss			1,633		1,709
Prior service (credit) cost			(20)		(25)
Total			1,613		1,684
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost Have Been Recorded as Follows Based Upon Expected Recovery in Rates [Abstract]
Current regulatory assets			94		100
Noncurrent regulatory assets			1,446		1,511
Deferred income taxes			19		19
Net-of-tax accumulated other comprehensive income			54		54
Total			$ 1,613		$ 1,684
Significant Assumptions Used to Measure Benefit Obligations [Abstract]
Discount rate for year-end valuation (as a percent)			4.31%		3.63%
Expected average long-term increase in compensation level (as a percent)			3.75%		3.75%
Mortality table			RP-2014		RP-2014
Cash Flows [Abstract]
Total contributions to Xcel Energy's pension plans during the period			$ 150		$ 162		125
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Service cost			94		94		92
Interest cost			133		147		160
Expected return on plan assets			(209)		(209)		(210)
Amortization of prior service cost (credit)			(5)		(2)		(2)
Amortization of net loss			111		107		97
Settlement charge			91		81		0
Net periodic benefit cost			215		218		137
Costs not recognized due to regulation			(75)		(79)		(15)
Net benefit cost recognized for financial reporting			140		139		$ 122
Settlement Charge Recognized in Operating and Maintenance Expenses			$ 11		$ 8
Significant Assumptions Used to Measure Costs [Abstract]
Discount rate (as a percent)			3.63%		4.13%		4.66%
Expected average long-term increase in compensation level (as a percent)			3.75%		3.75%		4.00%
Expected average long-term rate of return on assets (as a percent)			6.87%		6.87%		6.87%
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant			$ 0		$ 0
Amounts Not Yet Recognized As Components Of Net Periodic Benefit Cost Recorded As Current Regulatory Liabilities			0		0
Amounts Not Yet Recognized As Components Of Net Periodic Benefit Cost Recorded As Noncurrent Regulatory Liabilities			0		0
Liability, Defined Benefit Plan, Current			0		0
Liability, Defined Benefit Plan, Noncurrent			735		740
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position			$ (735)		$ (740)
Subsequent Event | Pension Plan [Member]
Cash Flows [Abstract]
Total contributions to Xcel Energy's pension plans during the period	$ 150

[1] (a) See Note 10 for further information regarding fair value measurement inputs and methods.

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Benefit Plans and Other Postretirement Benefits, Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plans [Abstract]
Contributions to 401(k) and other defined contribution plans	$ 38	$ 37	$ 36

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Benefit Plans and Other Postretirement Benefits, Postretirement Health Care Benefits (Details) - Other Postretirement Benefits Plan [Member]	Dec. 31, 2018	Dec. 31, 2017
Postretirement Health Care Benefits [Abstract]
Target pension asset allocations (as a percent)	100.00%	100.00%
Equity Securities
Postretirement Health Care Benefits [Abstract]
Target pension asset allocations (as a percent)	18.00%	24.00%
Long-duration fixed income and interest rate swap securities
Postretirement Health Care Benefits [Abstract]
Target pension asset allocations (as a percent)	0.00%	0.00%
Short-to-intermediate fixed income securities
Postretirement Health Care Benefits [Abstract]
Target pension asset allocations (as a percent)	70.00%	60.00%
Alternative investments
Postretirement Health Care Benefits [Abstract]
Target pension asset allocations (as a percent)	8.00%	9.00%
Cash
Postretirement Health Care Benefits [Abstract]
Target pension asset allocations (as a percent)	4.00%	7.00%

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Benefit Plans and Other Postretirement Benefits, Fair Value of Postretirement Benefit Plan Assets (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		$ 417	[1]	$ 461	[1]	$ 442
Plan assets at net asset value	[1]	40		0
Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	152		212
Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	225		249
Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Debt Securities
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		179		198	[2]
Plan assets at net asset value		0		0	[2]
Debt Securities | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[2]
Debt Securities | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		179		198	[2]
Debt Securities | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[2]
Equity Securities [Member]
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		35	[2]
Plan assets at net asset value		0		0	[2]
Equity Securities [Member] | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		35	[2]
Equity Securities [Member] | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[2]
Equity Securities [Member] | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[2]
Cash equivalents
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	19		29
Plan assets at net asset value	[1]	0		0
Cash equivalents | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	19		29
Cash equivalents | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Cash equivalents | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Insurance contracts
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	45		50
Plan assets at net asset value	[1]	0		0
Insurance contracts | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Insurance contracts | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	45		50
Insurance contracts | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Commingled Funds
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		173		148	[2]
Plan assets at net asset value		40		0	[2]
Commingled Funds | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		133		148	[2]
Commingled Funds | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[2]
Commingled Funds | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets		0		0	[2]
Other
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	1		1
Plan assets at net asset value	[1]	0		0
Other | Level 1
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	0		0
Other | Level 2
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	1		1
Other | Level 3
Plan Assets Measured at Fair Value for Each of the Fair Value Hierarchy Levels [Abstract]
Fair value of plan assets	[1]	$ 0		$ 0

[1] (a) See Note 10 for further information on fair value measurement inputs and methods.

[2] (a) See Note 10 for further information regarding fair value measurement inputs and methods.

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Benefit Plans and Other Postretirement Benefits, Postretirement Benefit Plan Benefit Obligations, Cash Flows and Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Change in Projected Benefit Obligation [Roll Forward]
Defined Benefit Plan, Plan Assets, Payment for Settlement	$ 198		$ 174
Funded Status of Plans at Dec. 31 [Abstract]
Noncurrent liabilities	(994)		(1,042)
Cash Flows [Abstract]
Total contributions to Xcel Energy's postretirement health care plans during the year	11		20		$ 18
Expected contribution to postretirement health care plans during 2018	11
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	0		0
Change in Projected Benefit Obligation [Roll Forward]
Obligation at Jan. 1	621		603
Service cost	2		2		2
Interest cost	22		24		26
Medicare subsidy reimbursements	1		1
Plan participants' contributions	8		8
Actuarial loss	(62)		33
Benefit payments	(50)		(50)
Obligation at Dec. 31	542		621		603
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at Jan. 1	461	[1]	442
Actual return (loss) on plan assets	(13)		41
Participant contributions	8		8
Employer contributions	11		20
Benefit payments	(50)		(50)
Fair value of plan assets at Dec. 31	417	[1]	461	[1]	442
Funded Status of Plans at Dec. 31 [Abstract]
Funded status	(125)		(160)
Current liabilities	(7)		(3)
Noncurrent liabilities	(118)		(157)
Net postretirement amounts recognized on consolidated balance sheets	(125)		(160)
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]
Net loss	116		147
Prior service (credit) cost	(33)		(44)
Total	83		103
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost Have Been Recorded as Follows Based Upon Expected Recovery in Rates [Abstract]
Current regulatory assets	0		0
Noncurrent regulatory assets	89		107
Current regulatory liabilities	(1)		(1)
Noncurrent regulatory liabilities	(10)		(10)
Deferred income taxes	1		2
Net-of-tax accumulated other comprehensive income	4		5
Total	$ 83		$ 103
Significant Assumptions Used to Measure Benefit Obligations [Abstract]
Discount rate for year-end valuation (as a percent)	4.32%		3.62%
Mortality table	RP-2014		RP-2014
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Pre-65	6.50%		7.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Post-65	5.35%		5.50%
Ultimate health care trend assumption rate (as a percent)	4.50%		4.50%
Period until ultimate trend rate is reached (in years)	4		5
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 2		$ 2		2
Interest cost	22		24		26
Expected return on plan assets	(26)		(25)		(25)
Amortization of prior service cost (credit)	(11)		(11)		(11)
Amortization of net loss	8		7		4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0		0		0
Net periodic benefit cost	$ (5)		$ (3)		$ (4)
Significant Assumptions Used to Measure Costs [Abstract]
Discount rate (as a percent)	3.62%		4.13%		4.65%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	0.00%		0.00%		0.00%
Expected average long-term rate of return on assets (as a percent)	5.30%		5.80%		5.80%
Defined Benefit Plan, Costs Not Recognized Due To Regulation	$ (2)		$ 0		$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (3)		$ (3)		$ (4)

[1] (a) See Note 10 for further information on fair value measurement inputs and methods.

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Benefit Plans and Other Postretirement Benefits, Projected Benefit Payments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Pension Plan [Member]
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract]
2019	$ 281
2020	260
2021	259
2022	260
2023	259
2024-2028	1,238
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract]
2019	45
2020	45
2021	45
2022	44
2023	43
2024-2028	197
Expected Medicare Part D Subsidies [Abstract]
2019	2
2020	2
2021	2
2022	2
2023	2
2024-2028	13
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
2019	43
2020	43
2021	43
2022	42
2023	41
2024-2028	$ 184

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Commitments and Contingencies, Fuel Contracts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Coal
Fuel Contracts [Abstract]
2019	$ 461
2020	260
2021	149
2022	109
2023	61
Thereafter	108
Total	1,148
Nuclear Fuel
Fuel Contracts [Abstract]
2019	127
2020	51
2021	99
2022	79
2023	99
Thereafter	337
Total	792
Natural Gas Supply
Fuel Contracts [Abstract]
2019	416
2020	263
2021	254
2022	114
2023	60
Thereafter	0
Total	1,107
Natural Gas Storage and Transportation
Fuel Contracts [Abstract]
2019	268
2020	255
2021	245
2022	234
2023	170
Thereafter	923
Total	$ 2,095
Minimum
Unrecorded Unconditional Purchase Obligation [Line Items]
Fuel Contract Expiration Date	2019
Maximum
Unrecorded Unconditional Purchase Obligation [Line Items]
Fuel Contract Expiration Date	2060
Capacity
Unrecorded Unconditional Purchase Obligation [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	$ 131	$ 168	$ 191
Fuel Contracts [Abstract]
2019	86
2020	70
2021	78
2022	77
2023	79
Thereafter	125
Total	$ 515

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Commitments and Contingencies, Purchased Power Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Long-term Contract for Purchase of Electric Power [Line Items]
Purchase Power Agreement Expiration Date	2034
Capacity
Purchased Power Agreements (PPAs) [Abstract]
Payments for capacity	$ 131	$ 168	$ 191
Estimated Future Payments Under PPAs [Abstract]
2019	86
2020	70
2021	78
2022	77
2023	79
Thereafter	125
Total	515
Energy
Estimated Future Payments Under PPAs [Abstract]
2019	99
2020	109
2021	157
2022	173
2023	177
Thereafter	328
Total	$ 1,043
Maximum
Long-term Contract for Purchase of Electric Power [Line Items]
Purchase Power Agreement Expiration Date	2039

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Commitments and Contingencies, Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property Held Under Capital Leases, Net [Abstract]
Property held under capital lease	$ 222	$ 222
Accumulated depreciation	(77)	(71)
Total property held under capital leases, net	145	151
Capital Leases, Future Minimum Payments Due [Abstract]
2019	14
2020	14
2021	14
2022	12
2023	12
Thereafter	220
Total minimum obligation	286
Interest component of obligation	(201)
Present value of minimum obligation	$ 85
Operating Leased Assets [Line Items]
Operating Lease Purchase Power Agreement Expiration Date	2034
Operating Leases, Future Minimum Payments Due [Abstract]
2019	$ 239
2020	234
2021	235
2022	221
2023	208
Thereafter	1,037
Office Space and Other Equipment [Member]
Operating Leases [Abstract]
Total expenses under operating lease obligations	248	246	$ 255
Operating Leases, Future Minimum Payments Due [Abstract]
2019	32
2020	26
2021	25
2022	24
2023	22
Thereafter	$ 154
WYCO Totem Gas Storage Facilities
Capital Leases [Abstract]
Ownership interest in joint venture (in hundredths)	50.00%
Percentage of the capital lease obligation related to WYCO eliminated (in hundredths)	50.00%
Gas Storage Facilities
Property Held Under Capital Leases, Net [Abstract]
Property held under capital lease	$ 201	201
Gas Pipeline
Property Held Under Capital Leases, Net [Abstract]
Property held under capital lease	21	21
Purchased Power Agreements
Operating Leases [Abstract]
Payments for capacity	210	$ 210	$ 216
Operating Leases, Future Minimum Payments Due [Abstract]
2019	207
2020	208
2021	210
2022	197
2023	186
Thereafter	$ 883

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Commitments and Contingencies, Variable Interest Entities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) MW	Dec. 31, 2017 USD ($) MW
Independent Power Producing Entities
Purchased Power Agreements [Abstract]
Generating capacity (in MW) | MW	3,770	3,537
VIE Purchase Power Agreement Expiration Date	2041
Harrington Station Power Plant [Member]
Fuel Contracts [Abstract]
Coal Supply Agreement Expiration Date	2022
Tolk Station Power Plant [Member]
Fuel Contracts [Abstract]
Coal Supply Agreement Expiration Date	2022
Low-Income Housing Limited Partnerships
Amount Reflected in Consolidated Balance Sheets [Abstract]
Current assets	$ 5	$ 6
Property, plant and equipment, net	42	46
Other noncurrent assets	1	1
Total assets	48	53
Current liabilities	7	9
Mortgages and other long-term debt payable	26	26
Other noncurrent liabilities	0	1
Total liabilities	$ 33	$ 36

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Commitments and Contingencies, Technology Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
IBM Agreement [Member]
Technology Agreements [Abstract]
Technology Agreement Expiration Date		2022
Percent of contract value to be paid if contract is terminated (in hundredths)		50.00%
Technology Agreements, Minimum Payments Due [Abstract]
2019	$ 30
2020	16
2021	16
2022	7
2023	0
Thereafter	0
Information Technology and Data Processing	81	$ 98	$ 119
Accenture Agreement [Member]
Technology Agreements [Abstract]
Technology Agreement Expiration Date		2020
Technology Agreements, Minimum Payments Due [Abstract]
2019	11
2020	11
2021	0
2022	0
2023	0
Thereafter	0
Information Technology and Data Processing	$ 46	$ 16	$ 35

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Commitments and Contingencies, Guarantees and Indemnifications (Details) $ in Millions	Dec. 31, 2018 USD ($)
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 12.0
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 6.0

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Commitments and Contingencies, Environmental Contingencies - Site Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Ashland MGP Site | NSP-Wisconsin
Manufactured Gas Plant (MGP) Site [Abstract]
Current Cost Estimate for Site Remediation	$ 192
Accrual for Environmental Loss Contingencies, Gross	27	$ 30
Estimated Amount Spent on Cleanup	$ 165
Approved Amortization Period for Recovery of Remediation Costs in Natural Gas Rates	10 years
Carrying Cost Percentage to be Applied to Unamortized Regulatory Asset	3.00%
Other MGP, Landfill, or Disposal Sites
Manufactured Gas Plant (MGP) Site [Abstract]
Number of Identified MGP, Landfill, or Disposal Sites Under Current Investigation and/or Remediation	12
Accrual for Environmental Loss Contingencies	$ 19	$ 9
Federal Coal Ash Regulation [Domain]
Site Contingency [Line Items]
Number of sites where regulated ash units will still be in operation at a specified date	9
Federal Coal Ash Regulation [Domain] | PSCo
Manufactured Gas Plant (MGP) Site [Abstract]
Number of sites where statistically significant increases over established groundwater standards exist	2
Federal Coal Ash Regulation [Domain] | NSP-Minnesota
Site Contingency [Line Items]
Estimated cost of construction of a new impoundment	$ 6
Number of impoundments where closure plans will be expedited	1

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Commitments and Contingencies, Environmental Contingencies - Unrecorded Unconditional Purchase Obligation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Plant
Clean Water Act Effluent Limitations Guidelines [Domain]
Environmental Requirements [Abstract]
Liability for Estimated Cost to Comply with Regulation	$ 12
PSCo | Federal Coal Ash Regulation [Domain]
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of sites where statistically significant increases over established groundwater standards exist	2
NSP-Minnesota | Federal Coal Ash Regulation [Domain]
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of sites where SSI's have been identified	1
NSP-Minnesota | Federal Clean Water Act Section 316(b)
Environmental Requirements [Abstract]
Minimum Number of Plants Which Could Be Required to Make Improvements to Reduce Entrainment | Plant	6
NSP-Wisconsin | Federal Clean Water Act Section 316(b)
Environmental Requirements [Abstract]
Minimum Number of Plants Which Could Be Required to Make Improvements to Reduce Entrainment | Plant	2
Capital Commitments | Federal Clean Water Act Section 316(b)
Environmental Requirements [Abstract]
Liability for Estimated Cost to Comply with Regulation	$ 40
Liability for Estimated Cost to Comply With Entrainment Regulation	$ 200
Harrington Units 1 and 2 | SPS | Implementation of the National Ambient Air Quality Standard for Sulfur Dioxide
Environmental Requirements [Abstract]
Number of Years Unclassifiable Areas Will Be Monitored	3 years
Tolk Units 1 and 2 | Capital Commitments | SPS | Regional Haze Rules
Environmental Requirements [Abstract]
Liability for Estimated Cost to Comply with Regulation	$ 600

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Commitments and Contingencies, Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 2,475	$ 2,782
Liabilities Incurred	13	1
Liabilities Settled	(14)	(30)
Accretion	120	136
Cash flow revisions	(26)	(414)
Ending balance	2,568	2,475
Legally restricted assets, for purposes of funding future nuclear decommissioning	2,055
Electric Plant Nuclear Production Decommissioning
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	1,874	2,249
Liabilities Incurred	0	0
Liabilities Settled	0	0
Accretion	94	114
Cash flow revisions	0	(489)
Ending balance	1,968	1,874
Electric Plant Wind Production
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	96	92
Liabilities Incurred	12	0
Liabilities Settled	0	0
Accretion	4	4
Cash flow revisions	7	0
Ending balance	119	96
Electric Plant Steam, Hydro and Other Production Asbestos
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	192	205
Liabilities Incurred	0	1
Liabilities Settled	(14)	(29)
Accretion	8	9
Cash flow revisions	(9)	6
Ending balance	177	192
Electric Plant Electric Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	21	20
Liabilities Incurred	0	0
Liabilities Settled	0	0
Accretion	1	1
Cash flow revisions	20	0
Ending balance	42	21
Electric Plant Other
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	5	5
Liabilities Incurred	0	0
Liabilities Settled	0	0
Accretion	0	0
Cash flow revisions	2	0
Ending balance	7	5
Natural Gas Plant Gas Transmission and Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	282	205
Liabilities Incurred	0	0
Liabilities Settled	0	0
Accretion	13	8
Cash flow revisions	(46)	69
Ending balance	249	282
Natural Gas Plant Other
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	4	4
Liabilities Incurred	0	0
Liabilities Settled	0	0
Accretion	0	0
Cash flow revisions	0	0
Ending balance	4	4
Common and Other Property Common Miscellaneous
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	1	2
Liabilities Incurred	0	0
Liabilities Settled	0	(1)
Accretion	0	0
Cash flow revisions	0	0
Ending balance	1	1
Non utility and other
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	0
Liabilities Incurred	1
Liabilities Settled	0
Accretion	0
Cash flow revisions	0
Ending balance	$ 1	$ 0

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Commitments and Contingencies, Removal Costs (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Regulatory Liabilities [Line Items]
Decommissioning Fund Investments, Fair Value	$ 2,055
Percentage Of Total Obligation For Decommissioning Expected To Be Funded By External Funds	100.00%
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 1,175	$ 1,131
Plant Removal Costs | NSP-Minnesota
Regulatory Liabilities [Line Items]
Regulatory liabilities	485	442
Plant Removal Costs | PSCo
Regulatory Liabilities [Line Items]
Regulatory liabilities	344	346
Plant Removal Costs | SPS
Regulatory Liabilities [Line Items]
Regulatory liabilities	188	197
Plant Removal Costs | NSP-Wisconsin
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 158	$ 146

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Commitments and Contingencies, Nuclear Insurance (Details) - NSP-Minnesota - Nuclear Insurance $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Plant Reactor
Nuclear Insurance [Abstract]
Nuclear insurance coverage secured for the Company's public liability exposure	$ 450
Nuclear insurance coverage exposure funded by the Secondary Financial Protection Program	13,600
Maximum assessments per reactor per accident	$ 138
Number of owned and licensed reactors | Reactor	3
Maximum funding requirement per reactor for any one year	$ 21
Insurance coverage limits for NSP-Minnesota's nuclear plant sites	$ 2,300
Number of nuclear plant sites operated by NSP-Minnesota | Plant	2
Maximum assessments for business interruption insurance each calendar year	$ 18
Maximum assessment for property damage insurance NSP-Minnesota is subject to each calendar year	39
Maximum
Nuclear Insurance [Abstract]
Loss Contingency, Estimate of Possible Loss	$ 14,100

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Commitments and Contingencies, Legal Contingencies (Details)	1 Months Ended						12 Months Ended
	Jan. 31, 2019 USD ($)	Nov. 30, 2017	Sep. 30, 2016	Dec. 31, 2015	Feb. 28, 2015	Nov. 30, 2013	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Gas Trading Litigation
Legal Contingencies [Abstract]
Loss Contingency, Pending Claims, Number							2
Loss Contingency, Settled Claims, number							4
NSP-Minnesota
Legal Contingencies [Abstract]
Percentage of Fault							48.00%
NSP-Minnesota | Insurance-related Assessments [Member]
Loss Contingencies [Line Items]
Nuclear Insurance Coverage Exposure Funded By Secondary Financial Protection Program							$ 13,600,000,000
Legal Contingencies [Abstract]
Maximum Assessments Per Reactor Per Accident							$ 138,000,000
PSCo | Line Extension Disputes
Legal Contingencies [Abstract]
Accrual For Legal Contingency								$ 0
General Electric (GE) [Domain]
Legal Contingencies [Abstract]
Percentage of Fault							52.00%
Minimum | PSCo | Line Extension Disputes
Legal Contingencies [Abstract]
Loss Contingency, Number of Plaintiffs				50
Summary Judgment Granted Against Plaintiff [Member] | Gas Trading Litigation
Legal Contingencies [Abstract]
Loss Contingency, Number of Plaintiffs		2
Remaining in Litigation [Member] | Gas Trading Litigation
Legal Contingencies [Abstract]
Loss Contingency, Number of Plaintiffs		3
FERC Proceeding, MISO ROE Complaint [Member] | NSP-Minnesota
Loss Contingencies [Line Items]
Public Utilities, Number of steps required							2
Legal Contingencies [Abstract]
Public Utilities, Base Return On Equity Charged To Customers Through Transmission Formula Rates					12.38%	12.38%
Public Utilities, ROE developed with new approach							10.28%
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, Recommended By Third Parties					8.67%	9.15%
Federal Energy Regulatory Commission (FERC) [Member] | FERC Proceeding, MISO ROE Complaint [Member] | NSP-Minnesota
Legal Contingencies [Abstract]
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, Approved			10.32%	10.32%
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, with RTO Adder, Approved								10.82%
Southwest Power Pool (SPP) [Member] | SPP Open Access Transmission Tariff Upgrade Costs [Member] | SPS
Legal Contingencies [Abstract]
Public Utilities, Billed Charges For Transmission Service Upgrades									$ 13,000,000
Subsequent Event | NSP-Minnesota
Legal Contingencies [Abstract]
Customer refund of previously recovered purchased power costs	$ 20,000,000

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Commitments and Contingencies, Other Commitments (Details)	12 Months Ended
	Dec. 31, 2017
Accenture Agreement [Member]
Other Commitments [Line Items]
Technology Agreement Expiration Date	2020

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Nuclear Obligations (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Canister	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Public Utilities, General Disclosures [Line Items]
Decommissioning Fund Investments, Fair Value	$ 2,055
Fuel Disposal [Abstract]
DOE fuel disposal assessments included in fuel expense		$ 0
Regulatory Plant Decommissioning Recovery [Abstract]
Assumed annual escalation rate during plant removal activities	4.36%	4.36%
Assumed annual escalation rate during spent fuel management and site restoration activities	3.36%	3.36%
Percentage Of Total Obligation For Decommissioning Expected To Be Funded By External Funds	100.00%
Approved annual accrual for decommissioning costs	$ 14
Funded Status of Nuclear Decommissioning Obligation [Abstract]
Estimated decommissioning cost obligation from most recently approved study (in 2014 dollars)	3,012	$ 3,012
Effect of escalating costs	539	396
Estimated decommissioning cost obligation (in current dollars)	3,551	3,408
Effect of escalating costs to payment date	7,654	7,797
Estimated future decommissioning costs (undiscounted)	11,205	11,205
Effect of discounting obligation (using average risk-free interest rate of 3.33% and 2.80% for 2018 and 2017, respectively)	(6,911)	(6,398)
Discounted decommissioning cost obligation	4,294	4,807
Underfunding of external decommissioning fund compared to the discounted decommissioning obligation	(2,239)	(2,664)
Regulatory Basis to GAAP Basis Reconciliation [Abstract]
Differences in Discount Rate and Market Risk Premium	(1,447)	(1,403)
Operating and Maintenance Costs Not Included for GAAP	(879)	(1,041)
ARO differences between 2017 and 2014 cost studies	0	(489)
Asset Retirement Obligation	2,568	2,475	$ 2,782
Annual Decommissioning Recorded As Depreciation Expense [Abstract]
Annual decommissioning recorded as depreciation expense: (a) (b)	$ 20	20	20
Minimum
Regulatory Plant Decommissioning Recovery [Abstract]
Assumed after tax rate of return used to determine funding for external decommissioning trust fund	5.23%
Maximum
Regulatory Plant Decommissioning Recovery [Abstract]
Assumed after tax rate of return used to determine funding for external decommissioning trust fund	6.30%
Nuclear Plant [Member]
Regulatory Basis to GAAP Basis Reconciliation [Abstract]
Asset Retirement Obligation	$ 1,968	1,874	$ 2,249
Monticello [Member]
Fuel Disposal [Abstract]
Number of authorized canisters filled and placed In dry cask nuclear storage facility | Canister	30
Prairie Island [Member]
Fuel Disposal [Abstract]
Number of authorized canisters filled and placed In dry cask nuclear storage facility | Canister	44
Number of authorized canisters in dry cask nuclear storage facility | Canister	64
Fair Value | Fair Value Measured on a Recurring Basis | Nuclear Decommissioning Fund
Funded Status of Nuclear Decommissioning Obligation [Abstract]
Assets Held in External Decommissioning Trust		$ 2,143
Measurement Input, Risk Free Interest Rate
Public Utilities, General Disclosures [Line Items]
Measurement input (as a percent)	0.0333	0.0280

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Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss) before Reclassifications, Tax	$ (2)	$ 0	$ 0
Income tax expense (benefit)	181	542	581
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	(2)	(2)	(5)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	11,455
Other comprehensive loss before reclassifications	(11)	(3)
Amortization of net actuarial loss	9	7
Net current period other comprehensive income (loss)	1	7
Adoption of ASU No. 2018-02		0
Accumulated other comprehensive income (loss) at end of period	12,222	11,455
Gains and Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	(58)	(51)
Other comprehensive loss before reclassifications	(5)	0
Amortization of net actuarial loss	0	0
Net current period other comprehensive income (loss)	(2)	3
Adoption of ASU No. 2018-02		(10)
Accumulated other comprehensive income (loss) at end of period	(60)	(58)	(51)
Defined Benefit Pension and Postretirement Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, Current Period, Tax	3	5
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	(67)	(59)
Other comprehensive loss before reclassifications	(6)	(3)
Amortization of net actuarial loss	9	7
Net current period other comprehensive income (loss)	3	4
Adoption of ASU No. 2018-02		(12)
Accumulated other comprehensive income (loss) at end of period	(64)	(67)	(59)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	(125)	(110)
Adoption of ASU No. 2018-02		(22)
Accumulated other comprehensive income (loss) at end of period	(124)	(125)	$ (110)
Interest Rate Swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amortization of net actuarial loss	3	3
Interest Rate Swap | Gains and Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amortization of net actuarial loss	3	3
Interest Rate Swap | Defined Benefit Pension and Postretirement Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amortization of net actuarial loss	0	0
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	0	0
Reclassification from AOCI, Current Period, Tax	0	0
Reclassification out of Accumulated Other Comprehensive Income | Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	$ 1	$ 2

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Segments and Related Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 11,537	$ 11,404	$ 11,107
Investment in subsidiaries	$ 141				$ 140				141	140
Depreciation and amortization									1,642	1,479	1,303
Total interest charges and financing costs									652	628	620
Income tax expense (benefit)									181	542	581
Net income (loss)	$ 214	$ 491	$ 265	$ 291	$ 189	$ 492	$ 227	$ 239	1,261	1,148	1,123
Regulated Electric
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									9,720	9,678	9,501
Depreciation and amortization									1,421	1,298	1,136
Total interest charges and financing costs									449	449	450
Income tax expense (benefit)									187	528	567
Net income (loss)									1,177	1,066	1,067
Regulated Natural Gas
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,741	1,651	1,532
Depreciation and amortization									212	174	160
Total interest charges and financing costs									61	57	54
Income tax expense (benefit)									28	23	76
Net income (loss)									187	182	124
All Other
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									79	78	76
Depreciation and amortization									9	7	7
Total interest charges and financing costs									142	122	116
Income tax expense (benefit)									(34)	(9)	(62)
Net income (loss)									(103)	(100)	(68)
Operating Segments
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									11,540	11,407	11,109
Operating Segments | Regulated Electric
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									9,719	9,676	9,500
Operating Segments | Regulated Natural Gas
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,739	1,650	1,531
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									(3)	(3)	(2)
Intersegment Eliminations [Member] | Regulated Electric
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1	2	1
Intersegment Eliminations [Member] | Regulated Natural Gas
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 2	$ 1	$ 1

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Summarized Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Operating revenues	$ 2,880		$ 3,048		$ 2,658		$ 2,951		$ 2,796		$ 3,017		$ 2,645		$ 2,946		$ 11,537	$ 11,404	$ 11,107
Operating income	339	[1]	696	[1]	450	[1]	480	[1]	440	[1]	824	[1]	466	[1]	492	[1]	1,965	2,223	2,240
Net income	$ 214		$ 491		$ 265		$ 291		$ 189		$ 492		$ 227		$ 239		$ 1,261	$ 1,148	$ 1,123
Basic (in dollars per share)	$ 0.42		$ 0.96		$ 0.52		$ 0.57		$ 0.37		$ 0.97		$ 0.45		$ 0.47		$ 2.47	$ 2.26	$ 2.21
Diluted (in dollars per share)	0.42		0.96		0.52		0.57		0.37		0.97		0.45		0.47		2.47	2.25	2.21
Cash dividends declared per common share (in dollars per share)	$ 0.38		$ 0.38		$ 0.38		$ 0.38		$ 0.36		$ 0.36		$ 0.36		$ 0.36		$ 1.52	$ 1.44	$ 1.36

[1] (a) In 2018, Xcel Energy implemented ASU No. 2017-07 related to net periodic benefit cost, which resulted in retrospective reclassification of pension costs from O&M expense to other income.

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Schedule I, Condensed Financial Statements of Xcel Energy Inc, Condensed Statements of Income (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income
Income (Loss) from Equity Method Investments									$ 35	$ 30	$ 42
Expenses and other deductions
Other income									14	10	18
Interest charges and financing costs									700	663	647
Income before income taxes									1,442	1,690	1,704
Income tax benefit									181	542	581
Net income	$ 214	$ 491	$ 265	$ 291	$ 189	$ 492	$ 227	$ 239	1,261	1,148	1,123
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension and retiree medical benefits, net of tax of $1, $3 and $(3) respectively									(6)	(3)	(8)
Other Comprehensive Income (Loss), Net of Tax									1	7
Comprehensive Income, Net of Tax									$ 1,262	$ 1,155	$ 1,123
Weighted average common shares outstanding:
Basic (in shares)									511	509	509
Diluted (in shares)									511	509	509
Earnings per average common share:
Basic (in dollars per share)	$ 0.42	$ 0.96	$ 0.52	$ 0.57	$ 0.37	$ 0.97	$ 0.45	$ 0.47	$ 2.47	$ 2.26	$ 2.21
Diluted (in dollars per share)	0.42	0.96	0.52	0.57	0.37	0.97	0.45	0.47	2.47	2.25	2.21
Cash dividends declared per common share (in dollars per share)	$ 0.38	$ 0.38	$ 0.38	$ 0.38	$ 0.36	$ 0.36	$ 0.36	$ 0.36	$ 1.52	$ 1.44	$ 1.36
Xcel Energy Inc.
Income
Income (Loss) from Equity Method Investments									$ 1,393	$ 1,263	$ 1,199
Total income									1,393	1,263	1,199
Expenses and other deductions
Operating expenses									24	30	22
Other income									(1)	(6)	(3)
Interest charges and financing costs									149	128	116
Total expenses and other deductions									172	152	135
Income before income taxes									1,221	1,111	1,064
Income tax benefit									(40)	(37)	(59)
Net income									1,261	1,148	1,123
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension and retiree medical benefits, net of tax of $1, $3 and $(3) respectively									3	4	(4)
Derivative instruments, net of tax of $(1), $2 and $2, respectively									(2)	3	4
Other Comprehensive Income (Loss), Net of Tax									1	7	0
Comprehensive Income, Net of Tax									$ 1,262	$ 1,155	$ 1,123

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Schedule I, Condensed Financial Statements of Xcel Energy Inc, Condensed Statements of Income (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Information Disclosure [Abstract]
Pension and retiree medical benefits, tax expense(benefit)	$ 1	$ 3	$ (3)
Derivative instruments, tax expense(benefit)	$ (1)	$ 2	$ 2

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Schedule I, Condensed Financial Statements of Xcel Energy Inc, Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net cash provided by (used in) operating activities	$ 3,122	$ 3,126	$ 3,052
Investing activities
Net cash provided by (used in) investing activities	(3,986)	(3,296)	(3,261)
Financing activities
Proceeds from (repayment of) short-term borrowings, net	225	422	(454)
Proceeds from issuance of long-term debt	1,675	1,518	2,424
Repayment of long-term debt	(452)	(1,030)	(1,036)
Proceeds from issuance of common stock	230	0	0
Repurchases of common stock	(1)	(3)	(32)
Dividends paid	(730)	(721)	(681)
Other, net	(19)	(18)	(12)
Net cash provided by (used in) financing activities	928	168	209
Net change in cash and cash equivalents	64	(2)	0
Cash and cash equivalents at beginning of period	83	85	85
Cash and cash equivalents at end of period	147	83	85
Xcel Energy Inc.
Operating activities
Net cash provided by (used in) operating activities	1,210	1,208	817
Investing activities
Capital contributions to subsidiaries	(809)	(849)	(414)
Investments in the utility money pool	(2,578)	(1,258)	(1,880)
Return of investments in the utility money pool	2,493	1,173	1,880
Net cash provided by (used in) investing activities	(894)	(934)	(414)
Financing activities
Proceeds from (repayment of) short-term borrowings, net	(295)	715	(516)
Proceeds from issuance of long-term debt	492	0	1,539
Repayment of long-term debt	0	(250)	(704)
Proceeds from issuance of common stock	230	0	0
Repurchases of common stock	(1)	(3)	(32)
Dividends paid	(730)	(721)	(681)
Other, net	(12)	(14)	(9)
Net cash provided by (used in) financing activities	(316)	(273)	(403)
Net change in cash and cash equivalents	0	1	0
Cash and cash equivalents at beginning of period	1		$ 0
Cash and cash equivalents at end of period	$ 1	$ 1

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Schedule I, Condensed Financial Statements of Xcel Energy Inc, Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 147	$ 83	$ 85	$ 85
Total current assets	3,094	2,973
Investment in subsidiaries	141	140
Other assets	272	278
Total other assets	5,949	5,728
Total assets	45,987	43,030
Liabilities and Equity
Dividends payable	195	183
Short-term debt	1,038	814
Other current liabilities	463	501
Total current liabilities	4,460	4,088
Other liabilities	206	145
Total deferred credits and other liabilities	13,502	12,967
Capitalization
Total common stockholders’ equity	12,222	11,455
Total liabilities and equity	45,987	43,030
Xcel Energy Inc.
Assets
Cash and cash equivalents	1	1		$ 0	$ 0
Accounts receivable from subsidiaries	309	302
Other current assets	1	1
Total current assets	311	304
Investment in subsidiaries	15,965	14,932
Other assets	44	103
Total other assets	16,009	15,035
Total assets	16,320	15,339
Liabilities and Equity
Long-term Debt, Current Maturities	0	0
Dividends payable	195	183
Short-term debt	488	783
Other current liabilities	10	11
Total current liabilities	693	977
Other liabilities	32	29
Total deferred credits and other liabilities	32	29
Commitments and contingencies
Capitalization
Long-term debt, noncurrent	3,373	2,878
Total common stockholders’ equity	12,222	11,455
Total capitalization	15,595	14,333
Total liabilities and equity	$ 16,320	$ 15,339

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Schedule I, Condensed Financial Statements of Xcel Energy Inc, Notes to Condensed Financial Statements (Details) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2018

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Money Pool [Abstract]

Schedule of Guarantor Obligations

Guarantees and bond indemnities issued and outstanding as of Dec. 31, 2018:

(Millions of Dollars)	Guarantor	Guarantee Amount		Current Exposure		Triggering Event
Guarantee of the indemnification obligations of Xcel Energy Services Inc. under the aircraft leases (a)	Xcel Energy Inc.	$	11.0	$	—	(d)
Guarantee of loan for Hiawatha Collegiate High School (b)	Xcel Energy Inc.	1.0		—		(d)
Total guarantees issued		12.0		$	—
Guarantee performance and payment of surety bonds for Xcel Energy Inc.’s utility subsidiaries (c)	Xcel Energy Inc.	$	51.1	(f)		(e)

Guarantor Obligations [Line Items]

Guarantees issued and outstanding

$ 12.0

$ 12.0

Current exposure under these guarantees

0.0

0.0

Obligations Under Aircraft Leases | Payment or Performance Guarantee

Guarantor Obligations [Line Items]

Guarantees issued and outstanding

11.0

11.0

Current exposure under these guarantees

0.0

0.0

Loan for Hiawatha Collegiate High School [Member] | Payment or Performance Guarantee

Guarantor Obligations [Line Items]

Guarantees issued and outstanding

1.0

1.0

Current exposure under these guarantees

0.0

$ 0.0

Guarantee Expiration Date (year)

2024

Surety Bonds | Payment or Performance Guarantee

Guarantor Obligations [Line Items]

Guarantees issued and outstanding

51.1

$ 51.1

Minimum | Obligations Under Aircraft Leases | Payment or Performance Guarantee

Guarantor Obligations [Line Items]

Guarantee Expiration Date (year)

2021

Maximum | Obligations Under Aircraft Leases | Payment or Performance Guarantee

Guarantor Obligations [Line Items]

Guarantee Expiration Date (year)

2023

Xcel Energy Inc.

Accounts Receivable and Payable with Affiliates [Abstract]

Accounts Receivable

309.0

$ 309.0

$ 302.0

Accounts Payable

0.0

0.0

0.0

Dividends [Abstract]

Cash dividends paid to Xcel Energy by subsidiaries

1,097.0

1,063.0

$ 923.0

Money Pool [Abstract]

Loan outstanding at period end

0.0

0.0

85.0

0.0

Average loan outstanding

59.0

71.0

38.0

66.0

Maximum loan outstanding

$ 172.0

$ 243.0

$ 226.0

$ 211.0

Weighted average interest rate, computed on a daily basis (percentage)

2.22%

1.95%

1.13%

0.69%

Weighted average interest rate at period end (percentage)

1.18%

Money pool interest income

$ 0.3

$ 1.4

$ 0.4

$ 0.5

Xcel Energy Inc. | NSP-Minnesota

Accounts Receivable and Payable with Affiliates [Abstract]

Accounts Receivable

117.0

117.0

68.0

Accounts Payable

0.0

0.0

0.0

Xcel Energy Inc. | NSP-Wisconsin

Accounts Receivable and Payable with Affiliates [Abstract]

Accounts Receivable

3.0

3.0

13.0

Accounts Payable

0.0

0.0

0.0

Xcel Energy Inc. | PSCo

Accounts Receivable and Payable with Affiliates [Abstract]

Accounts Receivable

29.0

29.0

69.0

Accounts Payable

0.0

0.0

0.0

Xcel Energy Inc. | SPS

Accounts Receivable and Payable with Affiliates [Abstract]

Accounts Receivable

39.0

39.0

26.0

Accounts Payable

0.0

0.0

0.0

Xcel Energy Inc. | Xcel Energy Services Inc.

Accounts Receivable and Payable with Affiliates [Abstract]

Accounts Receivable

96.0

96.0

95.0

Accounts Payable

0.0

0.0

0.0

Xcel Energy Inc. | Xcel Energy Ventures Inc.

Accounts Receivable and Payable with Affiliates [Abstract]

Accounts Receivable

13.0

13.0

14.0

Accounts Payable

0.0

0.0

0.0

Xcel Energy Inc. | Other Subsidiaries

Accounts Receivable and Payable with Affiliates [Abstract]

Accounts Receivable

12.0

12.0

17.0

Accounts Payable

$ 0.0

$ 0.0

$ 0.0

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Schedule II, Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Expense Related to Revaluation of Federal Benefit - TCJA	$ 14
Reduced Expense Related to Revaluation of Federal Benefits - TCJA	4
Allowance for Bad Debts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Jan. 1	52	$ 51	$ 52
Charged to costs and expenses	42	39	39
Charged to other accounts	11	10	11
Deductions from reserves	(50)	(48)	(51)
Balance at Dec. 31	55	52	51
NOL and Tax Credit Valuation Allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Jan. 1	77	58	28
Charged to costs and expenses	7	9	3
Charged to other accounts	0	22	35
Deductions from reserves	(5)	(12)	(8)
Balance at Dec. 31	$ 79	$ 77	$ 58