10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended June 30, 2021

or

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

For the transition period from to

Commission File Number: 001-03280

Public Service Company of Colorado

(Exact name of registrant as specified in its charter)

Colorado	84-0296600
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1800 Larimer Street, Suite 1100	Denver	CO			80202
(Address of principal executive offices)					(Zip Code)
			(303)	571-7511
(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
N/A	N/A	N/A

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. ☒ Yes ☐ No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of 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). ☒ Yes ☐ No

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.

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 Exchange Act). ☐ Yes ☒ No

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	Outstanding at July 29, 2021
Common Stock, $0.01 par value	100 shares

Public Service Company of Colorado meets the conditions set forth in General Instructions H(1)(a) and (b) of Form 10-Q and is therefore filing this Form 10-Q with the reduced disclosure format specified in General Instruction H(2) to such Form 10-Q.

TABLE OF CONTENTS

PART I — FINANCIAL INFORMATION
Item 1 —	Financial Statements (unaudited)	4
	Consolidated Statements of Income	4
	Consolidated Statements of Comprehensive Income	5
	Consolidated Statements of Cash Flows	6
	Consolidated Balance Sheets	7
	Consolidated Statements of Common Stockholder’s Equity	8
	Notes to Consolidated Financial Statements	9
Item 2 —	Management’s Discussion and Analysis of Financial Condition and Results of Operations	17
Item 4 —	Controls and Procedures	21
PART II — OTHER INFORMATION
Item 1 —	Legal Proceedings	21
Item 1A —	Risk Factors	21
Item 6 —	Exhibits	21
SIGNATURES		23

This Form 10-Q is filed by Public Service Company of Colorado (PSCo). PSCo is a wholly owned subsidiary of Xcel Energy Inc. Additional information on Xcel Energy is available in various filings with the Securities and Exchange Commission. This report should be read in its entirety.

Definitions of Abbreviations

Xcel Energy Inc.’s Subsidiaries and Affiliates (current and former)
e prime	e prime inc.
NSP-Minnesota	Northern States Power Company, a Minnesota corporation
NSP-Wisconsin	Northern States Power Company, a Wisconsin corporation
PSCo	Public Service Company of Colorado
SPS	Southwestern Public Service Company
Utility subsidiaries	NSP-Minnesota, NSP-Wisconsin, PSCo and SPS
Xcel Energy	Xcel Energy Inc. and 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
EPA	United States Environmental Protection Agency
FERC	Federal Energy Regulatory Commission
IRS	Internal Revenue Service
SEC	Securities and Exchange Commission

Electric, Purchased Gas and Resource Adjustment Clauses
DSM	Demand side management
PSIA	Pipeline System Integrity Adjustment

Other
AGIS	Advanced grid intelligence and security
ASC	FASB Accounting Standards Codification
CACJA	Clear air clean jobs act
C&I	Commercial and Industrial
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
CEO	Chief executive officer
CFO	Chief financial officer
COVID-19	Novel coronavirus
ETR	Effective tax rate
FASB	Financial Accounting Standards Board
GAAP	United States generally accepted accounting principles
GCA	Gas cost adjustment
IPP	Independent power producing entity
KEPCO	Korea Electric Power Corporation
MDL	Multi district litigation
MGP	Manufactured gas plant
NOL	Net operating loss
NOPR	Notice of proposed rulemaking
O&M	Operating and maintenance
PFAS	Per- and PolyFluoroAlkyl Substances
PPA	Power purchase agreement
PTC	Production tax credit
VIE	Variable interest entity
WACC	Weighted average cost of capital

Measurements
MW	Megawatts

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 those relating to future sales, future expenses, future operating performance, estimated base capital expenditures and financing plans, projected capital additions and forecasted annual revenue requirements with respect to rider filings, expected rate increases to customers, expectations and intentions regarding regulatory proceedings, and expected impacts on our results of operations, financial condition and cash flows or resettlement calculations and credit losses relating to certain energy transactions, 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 Quarterly Report on Form 10-Q and in other filings with the SEC (including PSCo’s Annual Report on Form 10-K for the fiscal year ended Dec. 31, 2020 and subsequent filings), could cause actual results to differ materially from management expectations as suggested by such forward-looking information: uncertainty around the impacts and duration of the COVID-19 pandemic; operational safety; successful long-term operational planning; commodity risks associated with energy markets and production; rising energy prices and fuel costs; qualified employee work force and third-party contractor factors; ability to recover costs; changes in regulation; 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 PSCo 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; tax laws; effects of geopolitical events, including war and acts of terrorism; cyber security threats and data security breaches; seasonal weather patterns; 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; and costs of potential regulatory penalties.

PART I — FINANCIAL INFORMATION

ITEM 1 — FINANCIAL STATEMENTS

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

(amounts in millions)

	Three Months Ended June 30				Six Months Ended June 30
	2021		2020		2021		2020
Operating revenues
Electric	$	827	$	715	$	1,560	$	1,427
Natural gas	338		186		753		518
Other	9		10		22		23
Total operating revenues	1,174		911		2,335		1,968
Operating expenses
Electric fuel and purchased power	328		258		599		529
Cost of natural gas sold and transported	168		50		338		187
Cost of sales — other	3		3		6		6
Operating and maintenance expenses	205		189		412		394
Demand side management expenses	32		37		64		71
Depreciation and amortization	185		158		368		315
Taxes (other than income taxes)	64		55		130		109
Total operating expenses	985		750		1,917		1,611
Operating income	189		161		418		357
Other income, net	1		2		3		—
Allowance for funds used during construction — equity	7		11		12		20
Interest charges and financing costs
Interest charges — includes other financing costs of $2, $2, $4 and $4, respectively	62		63		121		123
Allowance for funds used during construction — debt	(2)		(5)		(3)		(8)
Total interest charges and financing costs	60		58		118		115
Income before income taxes	137		116		315		262
Income tax expense	3		8		14		25
Net income	$	134	$	108	$	301	$	237

See Notes to Consolidated Financial Statements

4

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

(amounts in millions)

	Three Months Ended June 30				Six Months Ended June 30
	2021		2020		2021		2020
Net income	$	134	$	108	$	301	$	237
Other comprehensive income
Derivative instruments:
Reclassification of loss to net income, net of tax of $—, $—, $— and $—, respectively	—		—		1		1
Total other comprehensive income	—		—		1		1
Total comprehensive income	$	134	$	108	$	302	$	238

See Notes to Consolidated Financial Statements

5

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

(amounts in millions)

	Six Months Ended June 30
	2021		2020
Operating activities
Net income	$	301	$	237
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	357		317
Deferred income taxes	9		9
Amortization of investment tax credits	(1)		(1)
Allowance for equity funds used during construction	(12)		(20)
Provision for bad debts	10		11
Changes in operating assets and liabilities:
Accounts receivable	5		25
Accrued unbilled revenues	53		65
Inventories	8		20
Other current assets	13		7
Accounts payable	(10)		(83)
Net regulatory assets and liabilities	(554)		41
Other current liabilities	(187)		(86)
Pension and other employee benefit obligations	(50)		(47)
Other, net	60		(10)
Net cash provided by operating activities	2		485
Investing activities
Utility capital/construction expenditures	(705)		(918)
Investments in utility money pool arrangement	(240)		(366)
Repayments from utility money pool arrangement	240		366
Net cash used in investing activities	(705)		(918)
Financing activities
Repayments of short-term borrowings, net	(136)		—
Borrowings under utility money pool arrangement	443		1,311
Repayments under utility money pool arrangement	(500)		(1,350)
Proceeds from issuance of long-term debt	738		735
Capital contributions from parent	447		778
Dividends paid to parent	(221)		(574)
Net cash provided by financing activities	771		900
Net change in cash, cash equivalents and restricted cash	68		467
Cash, cash equivalents and restricted cash at beginning of period	28		11
Cash, cash equivalents and restricted cash at end of period	$	96	$	478
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	$	(116)	$	(107)
Cash paid for income taxes, net	(15)		(18)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	$	126	$	113
Inventory transfers to property, plant and equipment	10		17
Operating lease right-of-use assets	1		8
Allowance for equity funds used during construction	12		20

See Notes to Consolidated Financial Statements

6

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(amounts in millions, except share and per share data)

	June 30, 2021		Dec. 31, 2020
Assets
Current assets
Cash and cash equivalents	$	96	$	28
Accounts receivable, net	324		342
Accounts receivable from affiliates	—		8
Accrued unbilled revenues	246		298
Inventories	166		189
Regulatory assets	179		121
Derivative instruments	36		21
Prepayments and other	69		82
Total current assets	1,116		1,089
Property, plant and equipment, net	17,845		17,470
Other assets
Regulatory assets	1,637		1,059
Derivative instruments	40		16
Operating lease right-of-use assets	454		500
Other	224		231
Total other assets	2,355		1,806
Total assets	$	21,316	$	20,365
Liabilities and Stockholder's Equity
Current liabilities
Borrowings under utility money pool arrangement	$	—	$	57
Short-term debt	—		136
Accounts payable	430		452
Accounts payable to affiliates	67		58
Regulatory liabilities	97		100
Taxes accrued	139		251
Accrued interest	58		61
Dividends payable to parent	119		105
Derivative instruments	35		27
Operating lease liabilities	98		97
Other	90		84
Total current liabilities	1,133		1,428
Deferred credits and other liabilities
Deferred income taxes	1,929		1,897
Regulatory liabilities	2,397		2,337
Asset retirement obligations	407		399
Derivative instruments	46		51
Customer advances	163		168
Pension and employee benefit obligations	111		161
Operating lease liabilities	384		432
Other	183		176
Total deferred credits and other liabilities	5,620		5,621
Commitments and contingencies
Capitalization
Long-term debt	6,464		5,724
Common stock — 100 shares authorized of $0.01 par value; 100 shares outstanding at June 30, 2021 and Dec. 31, 2020, respectively	—		—
Additional paid in capital	6,210		5,770
Retained earnings	1,912		1,846
Accumulated other comprehensive loss	(23)		(24)
Total common stockholder's equity	8,099		7,592
Total liabilities and stockholder's equity	$	21,316	$	20,365

See Notes to Consolidated Financial Statements

7

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER’S EQUITY (UNAUDITED)

(amounts in millions, except share data)

	Common Stock Issued					Retained Earnings		Accumulated Other Comprehensive Loss		Total Common Stockholder's Equity
	Shares	Par Value		Additional Paid In Capital
Three Months Ended June 30, 2021 and 2020
Balance at March 31, 2020	100	$	—	$	4,989	$	2,109	$	(26)	$	7,072
Net income						108				108
Dividends declared to parent						(465)				(465)
Contribution of capital by parent				705						705
Balance at June 30, 2020	100	$	—	$	5,694	$	1,752	$	(26)	$	7,420
Balance at March 31, 2021	100	$	—	$	6,070	$	1,898	$	(23)	$	7,945
Net income						134				134
Dividends declared to parent						(120)				(120)
Contribution of capital by parent				140						140
Balance at June 30, 2021	100	$	—	$	6,210	$	1,912	$	(23)	$	8,099

	Common Stock Issued					Retained Earnings		Accumulated Other Comprehensive Loss		Total Common Stockholder's Equity
	Shares	Par Value		Additional Paid In Capital
Six Months Ended June 30, 2021 and 2020
Balance at Dec. 31, 2019	100	$	—	$	4,940	$	2,083	$	(27)	$	6,996
Net income						237				237
Other comprehensive income								1		1
Dividends declared to parent						(567)				(567)
Contribution of capital by parent				754						754
Adoption of ASC Topic 326						(1)				(1)
Balance at June 30, 2020	100	$	—	$	5,694	$	1,752	$	(26)	$	7,420
Balance at Dec. 31, 2020	100	$	—	$	5,770	$	1,846	$	(24)	$	7,592
Net income						301				301
Other comprehensive income								1		1
Dividends declared to parent						(235)				(235)
Contribution of capital by parent				440						440
Balance at June 30, 2021	100	$	—	$	6,210	$	1,912	$	(23)	$	8,099
See Notes to Consolidated Financial Statements

8

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES

Notes to Consolidated Financial Statements (UNAUDITED)

In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly, in accordance with GAAP, the financial position of PSCo and its subsidiaries as of June 30, 2021 and Dec. 31, 2020; the results of operations, including the components of net income, comprehensive income and changes in stockholder’s equity for the three and six months ended June 30, 2021 and 2020; and its cash flows for the six months ended June 30, 2021 and 2020.

All adjustments are of a normal, recurring nature, except as otherwise disclosed. Management has also evaluated the impact of events occurring after June 30, 2021, up to the date of issuance of these consolidated financial statements. These statements contain all necessary adjustments and disclosures resulting from that evaluation. The Dec. 31, 2020 balance sheet information has been derived from the audited 2020 consolidated financial statements included in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2020.

Notes to the consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP on an annual basis have been condensed or omitted pursuant to such rules and regulations. For further information, refer to the consolidated financial statements and notes thereto included in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2020, filed with the SEC on Feb. 17, 2021. Due to the seasonality of PSCo’s electric and natural gas sales, interim results are not necessarily an appropriate base from which to project annual results.

1. Summary of Significant Accounting Policies

The significant accounting policies set forth in Note 1 to the consolidated financial statements in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2020 appropriately represent, in all material respects, the current status of accounting policies and are incorporated herein by reference.

2. Accounting Pronouncements

Recently Adopted

Credit Losses — In 2016, the FASB issued Financial Instruments - Credit Losses, Topic 326 (ASC Topic 326), which changes how entities account for losses on receivables and certain other assets. The guidance requires use of a current expected credit loss model, which may result in earlier recognition of credit losses than under previous accounting standards.

PSCo implemented the guidance using a modified-retrospective approach, recognizing a cumulative effect charge of $1 million (after tax) to retained earnings on Jan. 1, 2020. Other than first-time recognition of an allowance for bad debts on accrued unbilled revenues, the Jan. 1, 2020, adoption of ASC Topic 326 did not have a significant impact on PSCo’s consolidated financial statements.

3. Selected Balance Sheet Data

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Accounts receivable, net
Accounts receivable	$	358	$	371
Less allowance for bad debts	(34)		(29)
Accounts receivable, net	$	324	$	342

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Inventories
Materials and supplies	$	64	$	63
Fuel	67		73
Natural gas	35		53
Total inventories	$	166	$	189

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Property, plant and equipment, net
Electric plant	$	16,020	$	15,736
Natural gas plant	5,173		5,037
Common and other property	1,201		1,191
Plant to be retired (a)	200		225
Construction work in progress	721		510
Total property, plant and equipment	23,315		22,699
Less accumulated depreciation	(5,470)		(5,229)
Property, plant and equipment, net	$	17,845	$	17,470

(a)Includes regulator-approved retirements of Comanche Units 1 and 2 and jointly owned Craig Unit 1. Also includes PSCo’s planned retirement of jointly owned Craig Unit 2.

4. Borrowings and Other Financing Instruments

Short-Term Borrowings

PSCo meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility and the money pool.

Money Pool — Xcel Energy Inc. and its utility subsidiaries have established a money pool arrangement that 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 borrowings for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021			Year Ended Dec. 31, 2020
Borrowing limit	$	250		$	250
Amount outstanding at period end	—			57
Average amount outstanding	—			59
Maximum amount outstanding	8			250
Weighted average interest rate, computed on a daily basis	0.04		%	0.60		%
Weighted average interest rate at period end	N/A			0.07

Commercial Paper — Commercial paper outstanding for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021		Year Ended Dec. 31, 2020
Borrowing limit	$	700	$	700
Amount outstanding at period end	—		136
Average amount outstanding	—		30
Maximum amount outstanding	—		230
Weighted average interest rate, computed on a daily basis	N/A		1.59		%
Weighted average interest rate at period end	N/A		0.20

9

Letters of Credit — PSCo uses letters of credit, generally with terms of one year, to provide financial guarantees for certain obligations. At both June 30, 2021 and Dec. 31, 2020, there were $8 million of letters of credit outstanding under the credit facility. Amounts approximate their fair value and are subject to fees.

Revolving Credit Facility — In order to issue its commercial paper, PSCo must have a revolving credit facility in place at least equal to the amount of its commercial paper borrowing limit and cannot issue commercial paper exceeding available capacity under this credit facility. The credit facility provides short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

PSCo has the right to request an extension of the revolving credit facility termination date for two additional one-year periods. All extension requests are subject to majority bank group approval.

At June 30, 2021, PSCo had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	700	$	8	$	692

(a)    Expires in June 2024.

(b)    Includes outstanding commercial paper and letters of credit.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility. PSCo had no direct advances on the credit facility outstanding at June 30, 2021 and Dec. 31, 2020.

Long-Term Borrowings

During the six months ended June 30, 2021, PSCo issued $750 million of 1.875% first mortgage bonds due June 15, 2031.

5. Revenues

Revenue is classified by the type of goods/services rendered and market/customer type. PSCo’s operating revenues consisted of the following:

	Three Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	272	$	204	$	3	$	479
C&I	426		81		6		513
Other	13		—		—		13
Total retail	711		285		9		1,005
Wholesale	48		—		—		48
Transmission	19		—		—		19
Other	14		38		—		52
Total revenue from contracts with customers	792		323		9		1,124
Alternative revenue and other	35		15		—		50
Total revenues	$	827	$	338	$	9	$	1,174

	Three Months Ended June 30, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	244	$	118	$	3	$	365
C&I	351		39		6		396
Other	12		—		—		12
Total retail	607		157		9		773
Wholesale	42		—		—		42
Transmission	14		—		—		14
Other	14		23		—		37
Total revenue from contracts with customers	677		180		9		866
Alternative revenue and other	38		6		1		45
Total revenues	$	715	$	186	$	10	$	911

	Six Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	518	$	443	$	6	$	967
C&I	752		165		15		932
Other	25		—		—		25
Total retail	1,295		608		21		1,924
Wholesale	135		—		—		135
Transmission	37		—		—		37
Other	23		83		—		106
Total revenue from contracts with customers	1,490		691		21		2,202
Alternative revenue and other	70		62		1		133
Total revenues	$	1,560	$	753	$	22	$	2,335

	Six Months Ended June 30, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	481	$	335	$	6	$	822
C&I	704		117		15		836
Other	24		—		—		24
Total retail	1,209		452		21		1,682
Wholesale	89		—		—		89
Transmission	27		—		—		27
Other	29		53		—		82
Total revenue from contracts with customers	1,354		505		21		1,880
Alternative revenue and other	73		13		2		88
Total revenues	$	1,427	$	518	$	23	$	1,968

6. Income Taxes

Note 7 to the consolidated financial statements included in PSCo’s Annual Report on Form 10-K for the year ended Dec. 31, 2020 represents, in all material respects, the current status of other income tax matters except to the extent noted below and are incorporated herein by reference.

10

Difference between the statutory rate and ETR:

	Six Months Ended June 30
	2021		2020 (a)
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	3.6		3.7
(Decreases) increases in tax from:
Wind PTCs	(15.1)		(9.8)
Plant regulatory differences (b)	(4.5)		(4.7)
Other (net)	(0.6)		(0.7)
Effective income tax rate	4.4	%	9.5	%

(a)Prior periods have been restated to conform to current year presentation.

(b)Regulatory differences for income tax primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit of excess deferred credits are offset by corresponding revenue reductions.

Federal Audits — PSCo is a member of the Xcel Energy affiliated group that files a consolidated federal income tax return. Statute of limitations applicable to Xcel Energy’s consolidated federal income tax returns expire as follows:

Tax Years	Expiration
2014 — 2016	January 2022
2017	September 2021

Additionally, the statute of limitations related to a federal tax loss carryback claim filed in 2020 has been extended. 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.

State Audits — PSCo is a member of the Xcel Energy affiliated group that files consolidated state income tax returns. As of June 30, 2021, PSCo’s earliest open tax year subject to examination by state taxing authorities under applicable statutes of limitations is 2009. As of June 30, 2021, there are no state income tax audits in progress.

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

Unrecognized tax benefits — permanent vs temporary:

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Unrecognized tax benefit — Permanent tax positions	$	8	$	7
Unrecognized tax benefit — Temporary tax positions	2		2
Total unrecognized tax benefit	$	10	$	9

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

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
NOL and tax credit carryforwards	$	(9)	$	(8)

As the IRS and state audits resume, it is reasonably possible that the amount of unrecognized tax benefit could decrease up to approximately $3 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)	June 30, 2021		Dec. 31, 2020
Payable for interest related to unrecognized tax benefits at beginning of period	$	—	$	(1)
Interest benefit related to unrecognized tax benefits	—		1
Payable for interest related to unrecognized tax benefits at end of period	$	—	$	—

No amounts were accrued for penalties related to unrecognized tax benefits as of June 30, 2021 or Dec. 31, 2020.

7. 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 net asset value.

Interest rate derivatives — The fair values of interest rate derivatives are based on broker quotes that utilize current market interest rate forecasts.

Commodity derivatives — The 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 inputs on a valuation is evaluated and may result in Level 3 classification.

Derivative Instruments Fair Value Measurements

PSCo 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 — PSCo enters into various instruments that 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, with changes in fair value prior to settlement recorded as other comprehensive income.

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At June 30, 2021, accumulated other comprehensive loss related to settled interest rate derivatives included $1 million of net losses expected to be reclassified into earnings during the next 12 months as the hedged transactions impact earnings, including forecasted amounts for unsettled hedges, as applicable.

Wholesale and Commodity Trading Risk — PSCo conducts 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. PSCo 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 the activities governed by this policy. Sharing of any margins is determined through state regulatory proceedings as well as the operation of the FERC approved joint operating agreement.

Commodity Derivatives — PSCo 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 and vehicle fuel.

PSCo enters 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. The classification as a regulatory asset or liability, if applicable, is based on approved regulatory recovery mechanisms.

As of June 30, 2021, PSCo had no commodity contracts designated as cash flow hedges.

PSCo 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 and options:

(Amounts in Millions) (a)(b)	June 30, 2021	Dec. 31, 2020
Megawatt hours of electricity	20	17
Million British thermal units of natural gas	86	93

(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 — PSCo continuously monitors the creditworthiness of the 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. The impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented on the consolidated balance sheets.

PSCo’s most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to its wholesale, trading and non-trading commodity activities.

At June 30, 2021, five of PSCo’s ten most significant counterparties for these activities, comprising $80 million, or 49%, of this credit exposure, had investment grade credit ratings from S&P Global Ratings, Moody’s Investor Services or Fitch Ratings. Four of the ten most significant counterparties, comprising $16 million, or 10%, of this credit exposure, were not rated by these external ratings agencies, but based on PSCo’s internal analysis, had credit quality consistent with investment grade. One of these significant counterparties, comprising $46 million, or 28%, of this credit exposure, had credit quality less than investment grade, based on internal analysis. Seven of these significant counterparties are independent system operators, municipal or cooperative electric entities, Regional Transmission Organizations or other utilities.

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
Three Months Ended June 30, 2021
Other derivative instruments
Natural gas commodity	$	—	$	(2)
Total	$	—	$	(2)
Six Months Ended June 30, 2021
Other derivative instruments
Natural gas commodity	$	—	$	(2)
Total	$	—	$	(2)
Three Months Ended June 30, 2020
Other derivative instruments
Natural gas commodity	$	—	$	(3)
Total	$	—	$	(3)
Six Months Ended June 30, 2020
Other derivative instruments
Natural gas commodity	$	—	$	(3)
Total	$	—	$	(3)

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	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)
Three Months Ended June 30, 2021
Other derivative instruments
Commodity trading	$	—		$	—		$	10	(b)
Total	$	—		$	—		$	10
Six Months Ended June 30, 2021
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	14	(b)
Natural gas commodity	—			6		(c)	(6)		(c)
Total	$	—		$	6		$	8

Three Months Ended June 30, 2020
Other derivative instruments
Commodity trading	$	—		$	—		$	(1)	(b)
Total	$	—		$	—		$	(1)
Six Months Ended June 30, 2020
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	(5)	(b)
Natural gas commodity	—			3		(c)	(3)		(c)
Total	$	—		$	3		$	(8)

(a)    Amounts are recorded to interest charges.

(b)    Amounts are 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 for both the three and six months ended June 30, 2021 and 2020, included no settlement gains or 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. The derivative settlement losses for both the three and six months ended June 30, 2021 and 2020 relate to natural gas operations and were recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

PSCo had no derivative instruments designated as fair value hedges during the three and six months ended June 30, 2021 and 2020.

Credit Related Contingent Features — Contract provisions for derivative instruments that PSCo enters into, 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 PSCo’s credit ratings are downgraded below its investment grade credit rating by any of the major credit rating agencies. At June 30, 2021 and Dec. 31, 2020, there were no derivative liabilities with such underlying contract provisions. Certain contracts also contain cross default provisions that may require the posting of collateral or settlement of the contracts if there was a failure under the other financing arrangements related to payment terms or other covenants. As of June 30, 2021 and Dec. 31, 2020, there were approximately $20 million and $46 million of derivative liabilities with such underlying contract provisions, respectively.

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 PSCo’s ability to fulfill its contractual obligations is reasonably expected to be impaired. PSCo had no collateral posted related to adequate assurance clauses in derivative contracts as of June 30, 2021 and Dec. 31, 2020.

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Recurring Fair Value Measurements — PSCo’s derivative assets and liabilities measured at fair value on a recurring basis:

	June 30, 2021												Dec. 31, 2020
	Fair Value						Fair Value Total		Netting (a)		Total		Fair Value						Fair Value Total		Netting (a)		Total
(Millions of Dollars)	Level 1		Level 2		Level 3								Level 1		Level 2		Level 3
Current derivative assets
Other derivative instruments:
Commodity trading	$	11	$	145	$	1	$	157	$	(129)	$	28	$	1	$	41	$	1	$	43	$	(28)	$	15
Natural gas commodity	—		8		—		8		—		8		—		6		—		6		—		6
Total current derivative assets	$	11	$	153	$	1	$	165	$	(129)	$	36	$	1	$	47	$	1	$	49	$	(28)	$	21
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	5	$	80	$	29	$	114	$	(74)	$	40	$	1	$	27	$	8	$	36	$	(20)	$	16
Total noncurrent derivative assets	$	5	$	80	$	29	$	114	$	(74)	$	40	$	1	$	27	$	8	$	36	$	(20)	$	16

	June 30, 2021												Dec. 31, 2020
	Fair Value						Fair Value Total		Netting (a)		Total		Fair Value						Fair Value Total		Netting (a)		Total
(Millions of Dollars)	Level 1		Level 2		Level 3								Level 1		Level 2		Level 3
Current derivative liabilities
Other derivative instruments:
Commodity trading	$	7	$	148	$	10	$	165	$	(133)	$	32	$	1	$	46	$	7	$	54	$	(33)	$	21
Natural gas commodity	—		3		—		3		—		3		—		6		—		6		—		6
Total current derivative liabilities	$	7	$	151	$	10	$	168	$	(133)	$	35	$	1	$	52	$	7	$	60	$	(33)	$	27
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	2	$	50	$	81	$	133	$	(87)	$	46	$	1	$	24	$	46	$	71	$	(20)	$	51
Total noncurrent derivative assets	$	2	$	50	$	81	$	133	$	(87)	$	46	$	1	$	24	$	46	$	71	$	(20)	$	51

(a)PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2021 and Dec. 31, 2020. At both June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include rights to reclaim cash collateral of $16 million and $5 million, respectively. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

Changes in Level 3 commodity derivatives:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Balance at April 1	$	(38)	$	(15)
Settlements	—		—
Net transactions recorded during the period:
Losses recognized in earnings (a)	(23)		(2)
Balance at June 30	$	(61)	$	(17)
	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Balance at Jan. 1	$	(44)	$	(13)
Settlements	(1)		(1)
Net transactions recorded during the period:
Losses recognized in earnings (a)	(16)		(3)
Balance at June 30	$	(61)	$	(17)

(a)Presented amounts relate to instruments held at the end of the period. The consolidated income statement also includes gains and losses on Level 1 and 2 instruments, and Level 3 instruments settled during the period.

PSCo recognizes transfers between levels as of the beginning of each period. There were no transfers of amounts between levels for derivative instruments for the three and six months ended June 30, 2021 and 2020.

Fair Value of Long-Term Debt

Other financial instruments for which the carrying amount did not equal fair value:

	June 30, 2021				Dec. 31, 2020
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	6,464	$	7,426	$	5,724	$	7,040

Fair value of PSCo’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 June 30, 2021 and Dec. 31, 2020 and given the observability of the inputs, fair values presented for long-term debt were assigned as Level 2.

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8. Benefit Plans and Other Postretirement Benefits

Components of Net Periodic Benefit Cost (Credit)

	Three Months Ended June 30
	2021		2020		2021		2020
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	8	$	8	$	—	$	—
Interest cost (a)	9		11		3		3
Expected return on plan assets (a)	(18)		(18)		(4)		(4)
Amortization of prior service credit (a)	—		(1)		(1)		(1)
Amortization of net loss (a)	8		8		1		—
Net periodic benefit cost (credit)	7		8		(1)		(2)
Effects of regulation	2		—		—		1
Net benefit cost (credit) recognized for financial reporting	$	9	$	8	$	(1)	$	(1)
	Six Months Ended June 30
	2021		2020		2021		2020
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	16	$	15	$	—	$	—
Interest cost (a)	19		23		6		6
Expected return on plan assets (a)	(36)		(35)		(8)		(9)
Amortization of prior service credit (a)	—		(1)		(2)		(2)
Amortization of net loss (a)	16		15		2		2
Net periodic benefit cost (credit)	15		17		(2)		(3)
Effects of regulation	2		—		1		1
Net benefit cost (credit) recognized for financial reporting	$	17	$	17	$	(1)	$	(2)

(a)     The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.

In January 2021, contributions of $125 million were made across four of Xcel Energy’s pension plans, of which $45 million was attributable to PSCo. Xcel Energy does not expect additional pension contributions during 2021.

9. Commitments and Contingencies

The following includes commitments, contingencies and unresolved contingencies that are material to PSCo’s financial position.

Legal

PSCo is involved in various litigation matters in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for losses probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to 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, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, would have a material effect on PSCo’s consolidated financial statements. Legal fees are generally 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 involving multiple plaintiffs 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.

Two cases remain active which include an MDL matter consisting of a Colorado purported class (Breckenridge) and a Wisconsin purported class (Arandell Corp.).

Breckenridge/Colorado — In February 2019, the MDL panel remanded Breckenridge back to the U.S. District Court in Colorado. Settlement of approximately $3 million was reached in February 2021. The parties have sought and are awaiting court approval of the settlement. A hearing was held on July 22, 2021. A decision is anticipated in Q3.

Arandell Corp. — The trial has been vacated and will be rescheduled after the court rules on the pending motions for reconsideration and for class certification. Xcel Energy has concluded that a loss is remote for the remaining lawsuit.

Rate Matters

Gas Cost Adjustment NOPR — In June 2021, the CPUC issued a NOPR addressing the recovery of costs through the GCA. The proposed rule would establish an annual forecast of GCA costs for each utility and allow each utility to recover only 90%-95% of any costs in excess of the forecasted amount. The proposed rule would allow utilities to earn an incentive equal to an undefined portion of any savings relative to forecasted costs. Initial comments were due July 23, 2021, reply comments are due Aug. 6, 2021 and a hearing is scheduled for Aug. 26, 2021. A CPUC decision in expected in the third quarter of 2021.

Environmental

MGP, Landfill and Disposal Sites

PSCo is investigating, remediating or performing post-closure actions at three MGP, landfill or other disposal sites across its service territory.

PSCo has recognized its best estimate of costs/liabilities from final resolution of these issues, however, the outcome and timing is unknown. In addition, there may be insurance recovery and/or recovery from other potentially responsible parties, offsetting a portion of costs incurred.

Environmental Requirements — Water and Waste

Coal Ash Regulation — PSCo’s operations are subject to federal and state regulations that impose requirements for handling, storage, treatment and disposal of solid waste. Under the CCR Rule, utilities are required to complete groundwater sampling around their CCR landfills and surface impoundments. Currently, PSCo has five regulated ash units in operation.

PSCo is conducting groundwater sampling and monitoring and implementing assessment of corrective measures at certain CCR landfills and surface impoundments. Increases above background concentrations were detected at four locations. Based on further assessments, PSCo is evaluating options for corrective action at two locations, one of which indicates potential offsite impacts to groundwater. The total cost is uncertain, but could be up to $35 million. PSCo is continuing to assess the financial and regulatory impacts.

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In August 2020, the EPA published its final rule to implement closure by April 2021 for all CCR impoundments affected by the August 2018 D.C. Circuit ruling. This final rule required PSCo to expedite closure plans for one impoundment.

PSCo also built an alternative collection and treatment system to remove the Comanche Station bottom ash pond from service. The total cost of the alternate treatment system is approximately $25 million. PSCo worked expeditiously to meet the April 11, 2021 deadline, but was not able to remove the pond from service until June 18, 2021. PSCo expects to negotiate a compliance order with the EPA. PSCo will also now proceed with closure of the pond, with an estimated cost of $3 million.

Closure costs for existing impoundments are included in the calculation of the asset retirement obligation.

Leases

PSCo evaluates contracts that may contain leases, including PPAs and arrangements for the use of office space and other facilities, vehicles and equipment. A contract contains a lease if it conveys the exclusive right to control the use of a specific asset.

Components of lease expense:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Operating leases
PPA capacity payments	$	26	$	25
Other operating leases (a)	3		3
Total operating lease expense (b)	$	29	$	28
Finance leases
Amortization of ROU assets	$	2	$	2
Interest expense on lease liability	4		4
Total finance lease expense	$	6	$	6

(a)Includes immaterial short-term lease expense for 2021 and 2020.

(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Operating leases
PPA capacity payments	$	51	$	49
Other operating leases (a)	7		7
Total operating lease expense (b)	$	58	$	56
Finance leases
Amortization of ROU assets	$	4	$	3
Interest expense on lease liability	8		9
Total finance lease expense	$	12	$	12

(a)Includes short-term lease expense of $1 million for 2021 and 2020, respectively.

(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

Commitments under operating and finance leases as of June 30, 2021:

(Millions of Dollars)	PPA Operating Leases		Other Operating Lease		Total Operating Leases		Finance Leases
Total minimum obligation	$	493	$	61	$	554	$	472
Interest component of obligation	(65)		(7)		(72)		(344)
Present value of minimum obligation	$	428	$	54	482		128
Less current portion					(98)		(5)
Noncurrent operating and finance lease liabilities					$	384	$	123

VIEs 

Under certain PPAs, PSCo purchases power from IPPs for which PSCo is required to reimburse fuel costs, or to participate in tolling arrangements under which PSCo procures the natural gas required to produce the energy that it purchases. These specific PPAs create a variable interest in the IPP.

PSCo had approximately 1,518 MW of capacity under long-term PPAs at both June 30, 2021 and Dec. 31, 2020 with entities that have been determined to be VIEs. PSCo concluded that these entities are not required to be consolidated in its financial statements because it does not have the power to direct the activities that most significantly impact the entities’ economic performance. The PPAs have expiration dates through 2032.

10. Other Comprehensive Income

Changes in accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended June 30, 2021						Three Months Ended June 30, 2020
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at April 1	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $—, $—, $— and $—, respectively) (a)	—		—		—		—		—		—
Net current period other comprehensive income	—		—		—		—		—		—
Accumulated other comprehensive loss at June 30	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)

(a) Included in interest charges

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	Six Months Ended June 30, 2021						Six Months Ended June 30, 2020
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1	$	(23)	$	(1)	$	(24)	$	(25)	$	(2)	$	(27)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $—, $—, $— and $—, respectively) (a)	1		—		1		1		—		1
Net current period other comprehensive income	1		—		1		1		—		1
Accumulated other comprehensive loss at June 30	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)

(a) Included in interest charges

11. Segment Information

PSCo evaluates performance 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.

PSCo has the following reportable segments:

•Regulated Electric — The regulated electric utility segment generates electricity which is transmitted and distributed in Colorado. This segment includes sales for resale and provides wholesale transmission service to various entities in the United States. Regulated electric utility also includes PSCo’s wholesale commodity and trading operations.

•Regulated Natural Gas — The regulated natural gas utility segment transports, stores and distributes natural gas in portions of Colorado.

PSCo also presents All Other, which includes operating segments with revenues below the necessary quantitative thresholds. Those operating segments primarily include steam revenue, appliance repair services and non-utility real estate activities.

Asset and capital expenditure information is not provided for PSCo’s reportable segments because, as an integrated electric and natural gas utility, PSCo operates significant assets that are not dedicated to a specific business segment and 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.

To report income from operations for regulated electric and regulated natural gas utility segments, the majority of costs are directly assigned to each segment. However, some costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators. A general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

PSCo’s segment information:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues	$	827	$	715
Net income	107		89
Regulated Natural Gas
Total revenues	$	338	$	186
Net income	30		16
All Other
Total revenues (a)	$	9	$	10
Net (loss) income	(3)		3
Consolidated Total
Total revenues (a)	$	1,174	$	911
Net income	134		108

(a)    Total revenues include $1 million of other affiliate revenue for both the three months ended June 30, 2021 and 2020.

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues	$	1,560	$	1,427
Net income	188		163
Regulated Natural Gas
Total revenues	$	753	$	518
Net income	114		68
All Other
Total revenues (a)	$	22	$	23
Net (loss) income	(1)		6
Consolidated Total
Total revenues (a)	$	2,335	$	1,968
Net income	301		237

(a)    Total revenues include $2 million of other affiliate revenue for both the six months ended June 30, 2021 and 2020.

17

ITEM 2 — MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Discussion of financial condition and liquidity for PSCo is omitted per conditions set forth in General Instructions H(1)(a) and (b) of Form 10-Q for wholly owned subsidiaries. It is replaced with management’s narrative analysis of the results of operations set forth in General Instruction H(2)(a) of Form 10-Q for wholly owned subsidiaries (reduced disclosure format).

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 electric margin and natural gas margin. 

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. PSCo’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.

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).

Results of Operations

PSCo’s net income was $301 million year-to-date, compared with $237 million for the prior year. The increase in year-to-date earnings was driven by higher natural gas and electric margins (primarily capital investment recovery and regulatory outcomes), partially offset by additional depreciation and other taxes (other than income taxes).

Electric Margin

Electric revenues and fuel and purchased power expenses are impacted by fluctuations in the price of natural gas and coal 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. In addition, electric customers receive a credit for PTCs generated, which reduce electric revenue and margin.

Electric revenues and margin:

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Electric revenues	$	1,560	$	1,427
Electric fuel and purchased power	(599)		(529)
Electric margin	$	961	$	898

Changes in electric margin:

(Millions of Dollars)	Six Months Ended June 30, 2021 vs. 2020
Non-fuel riders	$	65
Regulatory rate outcome	18
Proprietary commodity trading, net of sharing – Winter Storm Uri	11
Wholesale transmission revenue (net)	8
PTCs flowed back to customers (offset by lower ETR)	(27)
Demand side management revenues (offset in expense)	(6)
Sales and demand (a)	(4)
Other (net)	(2)
Total increase in electric margin	$	63

(a)     Sales decline excludes weather impact, net of decoupling, and demand revenue is not impacted by decoupling.

Natural Gas Margin

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

Natural gas revenues and margin:

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Natural gas revenues	$	753	$	518
Cost of natural gas sold and transported	(338)		(187)
Natural gas margin	$	415	$	331

Changes in natural gas margin:

(Millions of Dollars)	Six Months Ended June 30, 2021 vs. 2020
Regulatory rate outcomes	$	71
Estimated impact of weather	7
Infrastructure and integrity riders	3
Retail sales growth	2
Other, net	1
Total increase in natural gas margin	$	84

Non-Fuel Operating Expenses and Other Items

Depreciation and Amortization — Depreciation and amortization expense increased $53 million, or 16.8% year-to-date. The increase was primarily due to the in-servicing of the Cheyenne Ridge wind farm, new deprecation rates, normal system expansion and Comanche related regulatory asset amortization, partially offset by a decrease in amortization of pension regulatory assets.

18

Income Taxes — Income tax expense decreased $11 million for the first six months of 2021. The decrease was primarily driven by an increase in wind PTCs. Wind PTCs are credited to customers (recorded as a reduction to revenue) and do not have a material impact on net income. These were partially offset by higher pretax earnings in 2021.

See Note 6 to the consolidated financial statements.

Other

Winter Storm Uri

In February 2021, the central portion of the United States experienced a major winter storm (Winter Storm Uri). Extreme cold temperatures impacted certain operational assets as well as the availability of renewable generation across the region. The cold weather also affected the country’s supply and demand for natural gas. These factors contributed to extremely high market prices for natural gas and electricity.

As a result of the extremely high market prices, PSCo incurred net natural gas, fuel and purchased energy costs of approximately $610 million (largely deferred as regulatory assets) in the first quarter. Certain energy transactions are subject to final/settlement calculation adjustments, including the impacts of credit losses shared among market participants. Such adjustments are not expected to be material to our results of operations, financial condition or cash flows.

Regulatory Overview — PSCo has natural gas, fuel and purchased energy mechanisms for recovering incurred costs. In May, PSCo filed a request with the CPUC to recover $263 million in weather-related electric costs, $287 million in incremental gas costs and $4 million in incremental steam costs over 24 months with no financing charge. A decision is expected in the first quarter of 2022. In addition, the CPUC is considering prospective changes in fuel cost recovery.

Supply Chain and Capital Expenditures

PSCo’s ability to meet customer energy requirements, respond to storm-related disruptions and execute our capital expenditure program are dependent on maintaining an efficient supply chain. Overall, as a result of COVID-19, manufacturing processes have experienced disruptions related to scarcity of raw materials and interruptions in production and shipping. These disruptions have been further exacerbated by inflationary pressures, storms and labor shortages. The Company continues to monitor the availability of materials and seek alternative suppliers as necessary.

Public Utility Regulation

The FERC and state and local regulatory commissions regulate PSCo. PSCo is subject to rate regulation by state utility regulatory agencies, which have jurisdiction with respect to the rates of electric and natural gas distribution companies in Colorado.

Rates are designed to recover plant investment, operating costs and an allowed return on investment. PSCo requests changes in utility rates through commission filings. Changes in operating costs can affect PSCo’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 return on equity, capital structure and depreciation rates in rate proceedings. Decisions by these regulators can significantly impact PSCo’s results of operations.

Except to the extent noted below, the circumstances set forth in Public Utility Regulation included in Item 7 of PSCo’s Annual Report on Form 10-K for the year ended Dec. 31, 2020 and in Item 2 of PSCo’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2021, appropriately represent, in all material respects, the current status of public utility regulation and are incorporated herein by reference.

Pending and Recently Concluded Regulatory Proceedings

Proceeding	Amount (in millions)	Filing Date	Approval
PSIA Extension	$464	February 2021	Pending
Electric Rate Case	$470	July 2021	Pending

Additional Information:

PSIA Rider Extension — In February 2021, PSCo requested to extend its PSIA rider for three years (through the end of 2024), which would recover $464 million in project costs. The extension is intended to allow for a wind down of the rider and transition of recovery of the projects included in the rider to base rates in 2025. The Staff and OCC have recommended the CPUC deny the extension of the rider. However, if the CPUC were to allow the rider extension, the scope of the rider would be limited and only allow a return on debt. A CPUC decision is expected in the fourth quarter of 2021.

Colorado Electric Rate Request — In July 2021, PSCo filed a request with the CPUC seeking a net increase to retail electric base rate revenue of $343 million (or 12.4%). The total request reflects a $470 million increase, which includes $127 million of previously authorized costs currently recovered through various rider mechanisms. The request is based on a 10.0% ROE, an equity ratio of 55.64% and a 2022 forecast test year. The request also includes impacts of a new depreciation study. A required historical test year, including a 10.5% ROE, was also filed. Rates are expected to be effective April 9, 2022.

Revenue Request (millions of dollars)	2022
Changes since 2019 rate case:
Plant-related growth	$	95
AGIS	73
Updated cost of capital	53
New depreciation rates	43
Wildfire mitigation	25
Property taxes	25
Amortization of previously approved deferrals	17
Other	12
Net increase to revenue	343
Roll-in of previously authorized costs:
TCA rider revenues and Cheyenne Ridge costs	127
Total base revenue request	$	470
Expected average 2022 rate base (billions of dollars)	$	10.3

2019 Electric Rate Case Appeal — In August 2020, PSCo filed an appeal with the Denver District Court seeking a review of CPUC decisions on gains and losses on sales of assets, oil and gas royalty revenues, Board of Directors equity compensation and a true-up surcharge to collect the difference between what rates should have been in place from February through August 2020 (based on the CPUC’s decision on the Company’s Application for Reconsideration, Rehearing or Reargument) and what rates were actually in place. Briefing was completed on July 9, 2021 and a decision is pending.

19

2017 Natural Gas Rate Case Appeal — In April 2019, PSCo filed an appeal of the CPUC’s ruling regarding PSCo’s natural gas rate case. In March 2020, The District Court of Denver County ruled in favor of allowing the prepaid pension assets to be included in rate base; but it upheld the CPUC treatment of the retiree medical assets and capital structure methodology. In July 2021, the CPUC approved a weighted average cost of capital return for the applicable period of Jan. 1, 2018 through Oct. 31, 2020.

Decoupling Filing — PSCo's 2019 Electric Rate Case included a decoupling program, effective April 1, 2020 through Dec. 31, 2023. The program applies to Residential and metered small C&I customers who do not pay a demand charge. The program includes a refund and surcharge cap not to exceed 3% of forecasted base rate revenue for a specified period.

In April 2021, PSCo made its annual filing for 2020, and the revised tariff went into effect by operation of law on June 1, 2021. In the annual filing review, the CPUC indicated they may pursue reopening the case in order to revisit the cap. As of June 30, 2021, PSCo has recognized a refund for Residential customers and a surcharge for C&I customers based on 2020 results and 2021 estimated amounts to date.

Colorado’s Power Pathway Transmission Expansion — In March 2021, PSCo filed for a Certificate of Public Convenience and Necessity for the Power Pathway transmission project, proposing a 560-mile, 345 kilovolt double circuit transmission network to enable approximately 4,000-5,000 MW of renewable generation in eastern Colorado with an estimated cost of approximately $1.7 billion.

PSCo also presented an extension of the Power Pathway project into southeast Colorado, referred to as the May Valley - Longhorn Extension ($0.3 billion). PSCo expects future filings for related network upgrades, voltage support and interconnection facilities, which with the May Valley - Longhorn Extension, could result in an incremental investment of $0.5 - $0.8 billion. A CPUC decision regarding the Power Pathway project, as well as the May Valley - Longhorn Extension, is expected by February 2022.

PSCo KEPCO Filing — In September 2020, PSCo filed with the CPUC for approval to terminate a solar PPA with KEPCO Solar of Alamosa, Inc. and establish a regulatory asset to recover transaction costs of approximately $41 million. By terminating the PPA, customers would save approximately $38 million over an 11-year period. However, the Administrative Law Judge ruled against approval of the Termination Agreement. In July 2021, the CPUC upheld the Administrative Law Judge’s recommended decision. PSCo anticipates filing an Application for Reconsideration.

Electric Resource Plan — In March 2021, PSCo filed its 2021 Electric Resource Plan with the CPUC. The filing outlines the proposed future retirements/conversions of PSCo’s remaining coal plants and is expected to result in an 80% renewable fuel mix and an 85% carbon emissions reduction target by 2030.

Major components of PSCo's proposed preferred plan include:

•Early retirement of Comanche Generating Station: Unit 3 in 2040 (currently 2070).

•Early retirement of Hayden Generating Station: Unit 1 in 2028 (currently 2030); Unit 2 in 2027 (currently 2036).

•Conversion of Pawnee Generating Station from coal to natural gas in 2028 with retirement in 2041.

•2,300 MW of wind power.

•1,600 MW of large-scale solar power.

•400 MW of energy storage.

•1,300 MW of flexible dispatchable resources (including natural gas).

The preferred plan proposes to create a regulatory asset to recover costs over their original depreciation lives for the Hayden power plant and the coal handling equipment at Pawnee. It also proposes the use of securitization to finance and recover the remaining book value and decommissioning costs for Comanche Unit 3 upon retirement in 2040.

A CPUC decision on the resource plan is expected in January of 2022 with the competitive solicitation for resource additions expected in Q2 2022. Incremental generation system costs to meet carbon emission reduction targets are proposed to be recovered through a Clean Energy Plan Rider.

PSCo — Comanche Unit 3 — PSCo is part owner and operator of Comanche Unit 3, a 750 MW, coal-fueled electric generating unit. In January 2020, the unit experienced a turbine failure causing the unit to be taken offline for repairs, which were completed in June 2020. During start-up, the unit experienced a loss of turbine oil, which damaged the plant. Comanche Unit 3 recommenced operations in January 2021. Replacement and repair of damaged systems in excess of a $2 million deductible are expected to be recovered through insurance policies. PSCo incurred replacement power costs of approximately $16 million during the outage.

In October 2020, the CPUC initiated a non-adjudicatory review of Comanche Unit 3’s performance. A report on performance was issued in March 2021. The CPUC Staff’s report noted higher-than average outages and included some criticisms of PSCo’s operations of Comanche Unit 3 over the last ten years. The report recommended thorough explanation of the future of Comanche Unit 3 operations in the next resource plan, performance standards for all company-owned generation and a review of outage and repair costs in the upcoming proceedings.

In February 2021, the joint owners of Comanche Unit 3 (Intermountain Rural Electric Association and Holy Cross Electric) served PSCo with a notice of claim related to Comanche Unit 3's operation and availability. Discussions are proceeding pursuant to a contractual dispute resolution process and the amount of any alleged damages depends on multiple factors and is currently unknown.

20

Environmental

Affordable Clean Energy

In July 2019, the EPA adopted the Affordable Clean Energy rule, which requires states to develop plans by 2022 for greenhouse gas reductions from coal-fired power plants. In January 2021, the U.S. Court of Appeals for the D.C. Circuit issued a decision vacating and remanding the Affordable Clean Energy rule. That decision, if not successfully appealed or reconsidered, would allow the EPA to proceed with alternate regulation of coal-fired power plants. If the new rules require additional investment, PSCo believes, based on prior state commission practices, that the cost of these initiatives or replacement generation would be recoverable through rates.

Emerging Regulation

New regulations and legislation are being considered to regulate PFAS in drinking water, water discharges, commercial products, wastes, and other areas. PFAS are man-made chemicals found in many consumer products that can persist and accumulate in the environment. These chemicals have received heightened attention by environmental regulators. Increased regulation of PFAS and other emerging contaminants at the federal, state, and local level could have a potential adverse effect on our operations but at this time, it is uncertain what impact, if any, there will be on our results of operations, financial condition or cash flows. PSCo will continue to monitor these regulatory developments and their potential impact on its operations.

ITEM 4 — CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

PSCo 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 CEO and CFO, allowing timely decisions regarding required disclosure.

As of June 30, 2021, based on an evaluation carried out under the supervision and with the participation of PSCo’s management, including the CEO and CFO, of the effectiveness of its disclosure controls and procedures, the CEO and CFO have concluded that PSCo’s disclosure controls and procedures were effective.

Internal Control Over Financial Reporting

No changes in PSCo’s internal control over financial reporting occurred during the most recent fiscal quarter that materially affected, or are reasonably likely to materially affect, PSCo’s internal control over financial reporting.

PART II — OTHER INFORMATION

ITEM 1 — LEGAL PROCEEDINGS

PSCo is involved in various litigation matters in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for losses probable of being incurred and subject to reasonable estimation.

Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to, 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 that the ultimate liabilities, if any, would have a material effect on PSCo’s consolidated financial statements. Legal fees are generally expensed as incurred.

See Note 9 to the consolidated financial statements and Part I Item 2 for further information.

ITEM 1A — RISK FACTORS

PSCo’s risk factors are documented in Item 1A of Part I of its Annual Report on Form 10-K for the year ended Dec. 31, 2020, which is incorporated herein by reference. There have been no material changes from the risk factors previously disclosed in the Form 10-K.

21

ITEM 6 — EXHIBITS

* Indicates incorporation by reference

Exhibit Number	Description	Report or Registration Statement	Exhibit Reference
3.01*	Amended and Restated Articles of Incorporation, dated July 15, 1998	PSCo Form 10-Q for the quarter ended Sept. 30, 2017	3.01
3.02*	Amended and Restated Bylaws of PSCo, dated Jan. 25, 2019	PSCo Form 10-K for the year ended Dec. 31, 2018	3.02
31.01	Principal Executive Officer’s certifications 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 certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.01	Certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Schema
101.CAL	Inline XBRL Calculation
101.DEF	Inline XBRL Definition
101.LAB	Inline XBRL Label
101.PRE	Inline XBRL Presentation
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

22

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		Public Service Company of Colorado
July 29, 2021	By:	/s/ JEFFREY S. SAVAGE
		Jeffrey S. Savage
		Senior Vice President, Controller
		(Principal Accounting Officer)
		/s/ BRIAN J. VAN ABEL
		Brian J. Van Abel
		Executive Vice President, Chief Financial Officer and Director
		(Principal Financial Officer)

23

EX-31.01

Exhibit 31.01

CERTIFICATION

I, Ben Fowke, certify that:

1.I have reviewed this report on Form 10-Q of Public Service Company of Colorado;

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: July 29, 2021

/s/ BEN FOWKE

Ben Fowke

Chairman, Chief Executive Officer and Director

(Principal Executive Officer)

1

EX-31.02

Exhibit 31.02

CERTIFICATION

I, Brian J. Van Abel, certify that:

1.I have reviewed this report on Form 10-Q of Public Service Company of Colorado;

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: July 29, 2021

/s/ BRIAN J. VAN ABEL

Brian J. Van Abel

Executive Vice President, Chief Financial Officer and Director

(Principal 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 Quarterly Report of Public Service Company of Colorado (PSCo) on Form 10-Q for the quarter ended June 30, 2021, as filed with the SEC on the date hereof (Form 10-Q), each of the undersigned officers of PSCo 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-Q 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-Q fairly presents, in all material respects, the financial condition and results of operations of PSCo as of the dates and for the periods expressed in the Form 10-Q.

Date: July 29, 2021

/s/ BEN FOWKE

Ben Fowke

Chairman, Chief Executive Officer and Director

(Principal Executive Officer)

/s/ BRIAN J. VAN ABEL

Brian J. Van Abel

Executive Vice President, Chief Financial Officer and Director

(Principal 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 PSCo and will be retained by PSCo and furnished to the SEC or its staff upon request.

1

XML

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	Jun. 30, 2021	Jul. 29, 2021
Cover [Abstract]
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Document Type	10-Q
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Entity File Number	001-03280
Entity Registrant Name	Public Service Company of Colorado
Entity Incorporation, State or Country Code	CO
Entity Tax Identification Number	84-0296600
Entity Address, Address Line One	1800 Larimer Street, Suite 1100
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating revenues
Electric	$ 827	$ 715	$ 1,560	$ 1,427
Natural gas	338	186	753	518
Other	9	10	22	23
Total operating revenues	1,174	911	2,335	1,968
Operating expenses
Electric fuel and purchased power	328	258	599	529
Cost of natural gas sold and transported	168	50	338	187
Cost of sales — other	3	3	6	6
Operating and maintenance expenses	205	189	412	394
Demand side management expenses	32	37	64	71
Depreciation and amortization	185	158	368	315
Taxes (other than income taxes)	64	55	130	109
Total operating expenses	985	750	1,917	1,611
Operating income	189	161	418	357
Other income, net	1	2	3	0
Allowance for funds used during construction — equity	7	11	12	20
Interest charges and financing costs
Interest charges — includes other financing costs of $2, $2, $4 and $4, respectively	62	63	121	123
Allowance for funds used during construction — debt	(2)	(5)	(3)	(8)
Total interest charges and financing costs	60	58	118	115
Income before income taxes	137	116	315	262
Income tax expense	3	8	14	25
Net income	$ 134	$ 108	$ 301	$ 237

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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Financial Position [Abstract]
Other financing costs	$ 2	$ 2	$ 4	$ 4

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Comprehensive income:
Net income	$ 134	$ 108	$ 301	$ 237
Derivative instruments:
Reclassification of loss to net income, net of tax of $—, $—, $— and $—, respectively	0	0	1	1
Total other comprehensive income	0	0	1	1
Total comprehensive income	$ 134	$ 108	$ 302	$ 238

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Tax	$ 0	$ 0	$ 0	$ 0

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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net income	$ 301	$ 237
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	357	317
Deferred income taxes	9	9
Amortization of investment tax credits	(1)	(1)
Allowance for equity funds used during construction	(12)	(20)
Provision for bad debts	10	11
Changes in operating assets and liabilities:
Accounts receivable	5	25
Accrued unbilled revenues	53	65
Inventories	8	20
Other current assets	13	7
Accounts payable	(10)	(83)
Net regulatory assets and liabilities	(554)	41
Other current liabilities	(187)	(86)
Pension and other employee benefit obligations	(50)	(47)
Other, net	60	(10)
Net cash provided by operating activities	2	485
Investing activities
Utility capital/construction expenditures	(705)	(918)
Investments in utility money pool arrangement	(240)	(366)
Repayments from utility money pool arrangement	240	366
Net cash used in investing activities	(705)	(918)
Financing activities
Repayments of short-term borrowings, net	(136)	0
Borrowings under utility money pool arrangement	443	1,311
Repayments under utility money pool arrangement	(500)	(1,350)
Proceeds from issuance of long-term debt	738	735
Capital contributions from parent	447	778
Dividends paid to parent	(221)	(574)
Net cash provided by financing activities	771	900
Net change in cash, cash equivalents and restricted cash	68	467
Cash, cash equivalents and restricted cash at beginning of period	28	11
Cash, cash equivalents and restricted cash at end of period	96	478
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(116)	(107)
Cash paid for income taxes, net	(15)	(18)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	126	113
Inventory transfers to property, plant and equipment	10	17
Allowance for equity funds used during construction	12	20
Operating lease right-of-use assets	$ 1	$ 8

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CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash, cash equivalents and restricted cash at beginning of period	$ 96	$ 28
Accounts receivable, net	324	342
Accounts receivable from affiliates	0	8
Accrued unbilled revenues	246	298
Inventories	166	189
Regulatory assets	179	121
Derivative instruments	36	21
Prepayments and other	69	82
Total current assets	1,116	1,089
Property, plant and equipment, net	17,845	17,470
Other assets
Regulatory assets	1,637	1,059
Derivative instruments	40	16
Operating lease right-of-use assets	454	500
Other	224	231
Total other assets	2,355	1,806
Total assets	21,316	20,365
Current liabilities
Borrowings under utility money pool arrangement	0	57
Short-term debt	0	136
Accounts payable	430	452
Accounts payable to affiliates	67	58
Regulatory liabilities	97	100
Taxes accrued	139	251
Accrued interest	58	61
Dividends payable to parent	119	105
Derivative instruments	35	27
Operating lease liabilities	98	97
Other	90	84
Total current liabilities	1,133	1,428
Deferred credits and other liabilities
Deferred income taxes	1,929	1,897
Regulatory liabilities	2,397	2,337
Asset retirement obligations	407	399
Derivative instruments	46	51
Customer advances	163	168
Pension and employee benefit obligations	111	161
Operating lease liabilities	384	432
Other	183	176
Total deferred credits and other liabilities	5,620	5,621
Commitments and contingencies
Capitalization
Long-term debt	$ 6,464	$ 5,724
Common Stock, Shares Authorized	100	100
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares, Outstanding	100	100
Common stock — 100 shares authorized of $0.01 par value; 100 shares outstanding at June 30, 2021 and Dec. 31, 2020, respectively	$ 0	$ 0
Additional paid in capital	6,210	5,770
Retained earnings	1,912	1,846
Accumulated other comprehensive loss	(23)	(24)
Total common stockholder's equity	8,099	7,592
Total liabilities and stockholder's equity	$ 21,316	$ 20,365

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CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2019		100
Beginning Balance at Dec. 31, 2019	$ 6,996	$ 0	$ 4,940	$ 2,083	$ (27)
Increase (Decrease) in Stockholder's Equity
Net income	237			237
Total other comprehensive income	1				1
Dividends declared to parent	(567)			(567)
Contribution of capital by parent	754		754
Adoption of ASC Topic 326	(1)			(1)
Balance (in shares) at Jun. 30, 2020		100
Ending Balance at Jun. 30, 2020	7,420	$ 0	5,694	1,752	(26)
Balance (in shares) at Mar. 31, 2020		100
Beginning Balance at Mar. 31, 2020	7,072	$ 0	4,989	2,109	(26)
Increase (Decrease) in Stockholder's Equity
Net income	108			108
Total other comprehensive income	0
Dividends declared to parent	(465)			(465)
Contribution of capital by parent	705		705
Balance (in shares) at Jun. 30, 2020		100
Ending Balance at Jun. 30, 2020	$ 7,420	$ 0	5,694	1,752	(26)
Balance (in shares) at Dec. 31, 2020	100	100
Beginning Balance at Dec. 31, 2020	$ 7,592	$ 0	5,770	1,846	(24)
Increase (Decrease) in Stockholder's Equity
Net income	301			301
Total other comprehensive income	1				1
Dividends declared to parent	(235)			(235)
Contribution of capital by parent	$ 440		440
Balance (in shares) at Jun. 30, 2021	100	100
Ending Balance at Jun. 30, 2021	$ 8,099	$ 0	6,210	1,912	(23)
Balance (in shares) at Mar. 31, 2021		100
Beginning Balance at Mar. 31, 2021	7,945	$ 0	6,070	1,898	(23)
Increase (Decrease) in Stockholder's Equity
Net income	134			134
Total other comprehensive income	0
Dividends declared to parent	(120)			(120)
Contribution of capital by parent	$ 140		140
Balance (in shares) at Jun. 30, 2021	100	100
Ending Balance at Jun. 30, 2021	$ 8,099	$ 0	$ 6,210	$ 1,912	$ (23)

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Management's Opinion

6 Months Ended

Jun. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Management's Opinion

In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly, in accordance with GAAP, the financial position of PSCo and its subsidiaries as of June 30, 2021 and Dec. 31, 2020; the results of operations, including the components of net income, comprehensive income and changes in stockholder’s equity for the three and six months ended June 30, 2021 and 2020; and its cash flows for the six months ended June 30, 2021 and 2020.

All adjustments are of a normal, recurring nature, except as otherwise disclosed. Management has also evaluated the impact of events occurring after June 30, 2021, up to the date of issuance of these consolidated financial statements. These statements contain all necessary adjustments and disclosures resulting from that evaluation. The Dec. 31, 2020 balance sheet information has been derived from the audited 2020 consolidated financial statements included in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2020.

Notes to the consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP on an annual basis have been condensed or omitted pursuant to such rules and regulations. For further information, refer to the consolidated financial statements and notes thereto included in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2020, filed with the SEC on Feb. 17, 2021. Due to the seasonality of PSCo’s electric and natural gas sales, interim results are not necessarily an appropriate base from which to project annual results.

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Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	The significant accounting policies set forth in Note 1 to the consolidated financial statements in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2020 appropriately represent, in all material respects, the current status of accounting policies and are incorporated herein by reference.

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Accounting Pronouncements

6 Months Ended

Jun. 30, 2021

Accounting Standards Update and Change in Accounting Principle [Abstract]

Accounting Pronouncements

Recently Adopted

Credit Losses — In 2016, the FASB issued Financial Instruments - Credit Losses, Topic 326 (ASC Topic 326), which changes how entities account for losses on receivables and certain other assets. The guidance requires use of a current expected credit loss model, which may result in earlier recognition of credit losses than under previous accounting standards.

PSCo implemented the guidance using a modified-retrospective approach, recognizing a cumulative effect charge of $1 million (after tax) to retained earnings on Jan. 1, 2020. Other than first-time recognition of an allowance for bad debts on accrued unbilled revenues, the Jan. 1, 2020, adoption of ASC Topic 326 did not have a significant impact on PSCo’s consolidated financial statements.

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Selected Balance Sheet Data

6 Months Ended

Jun. 30, 2021

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Accounts receivable, net
Accounts receivable	$	358	$	371
Less allowance for bad debts	(34)		(29)
Accounts receivable, net	$	324	$	342

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Inventories
Materials and supplies	$	64	$	63
Fuel	67		73
Natural gas	35		53
Total inventories	$	166	$	189

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Property, plant and equipment, net
Electric plant	$	16,020	$	15,736
Natural gas plant	5,173		5,037
Common and other property	1,201		1,191
Plant to be retired (a)	200		225
Construction work in progress	721		510
Total property, plant and equipment	23,315		22,699
Less accumulated depreciation	(5,470)		(5,229)
Property, plant and equipment, net	$	17,845	$	17,470

(a)Includes regulator-approved retirements of Comanche Units 1 and 2 and jointly owned Craig Unit 1. Also includes PSCo’s planned retirement of jointly owned Craig Unit 2.

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Borrowings and Other Financing Instruments

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Borrowings and Other Financing Instruments

Short-Term Borrowings

PSCo meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility and the money pool.

Money Pool — Xcel Energy Inc. and its utility subsidiaries have established a money pool arrangement that 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 borrowings for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021			Year Ended Dec. 31, 2020
Borrowing limit	$	250		$	250
Amount outstanding at period end	—			57
Average amount outstanding	—			59
Maximum amount outstanding	8			250
Weighted average interest rate, computed on a daily basis	0.04		%	0.60		%
Weighted average interest rate at period end	N/A			0.07

Commercial Paper — Commercial paper outstanding for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021		Year Ended Dec. 31, 2020
Borrowing limit	$	700	$	700
Amount outstanding at period end	—		136
Average amount outstanding	—		30
Maximum amount outstanding	—		230
Weighted average interest rate, computed on a daily basis	N/A		1.59		%
Weighted average interest rate at period end	N/A		0.20

Letters of Credit — PSCo uses letters of credit, generally with terms of one year, to provide financial guarantees for certain obligations. At both June 30, 2021 and Dec. 31, 2020, there were $8 million of letters of credit outstanding under the credit facility. Amounts approximate their fair value and are subject to fees.

Revolving Credit Facility — In order to issue its commercial paper, PSCo must have a revolving credit facility in place at least equal to the amount of its commercial paper borrowing limit and cannot issue commercial paper exceeding available capacity under this credit facility. The credit facility provides short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

PSCo has the right to request an extension of the revolving credit facility termination date for two additional one-year periods. All extension requests are subject to majority bank group approval.

At June 30, 2021, PSCo had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	700	$	8	$	692

(a)    Expires in June 2024.

(b)    Includes outstanding commercial paper and letters of credit.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility. PSCo had no direct advances on the credit facility outstanding at June 30, 2021 and Dec. 31, 2020.

Long-Term Borrowings

During the six months ended June 30, 2021, PSCo issued $750 million of 1.875% first mortgage bonds due June 15, 2031.

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Revenues

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenues

Revenue is classified by the type of goods/services rendered and market/customer type. PSCo’s operating revenues consisted of the following:

	Three Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	272	$	204	$	3	$	479
C&I	426		81		6		513
Other	13		—		—		13
Total retail	711		285		9		1,005
Wholesale	48		—		—		48
Transmission	19		—		—		19
Other	14		38		—		52
Total revenue from contracts with customers	792		323		9		1,124
Alternative revenue and other	35		15		—		50
Total revenues	$	827	$	338	$	9	$	1,174

	Three Months Ended June 30, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	244	$	118	$	3	$	365
C&I	351		39		6		396
Other	12		—		—		12
Total retail	607		157		9		773
Wholesale	42		—		—		42
Transmission	14		—		—		14
Other	14		23		—		37
Total revenue from contracts with customers	677		180		9		866
Alternative revenue and other	38		6		1		45
Total revenues	$	715	$	186	$	10	$	911

	Six Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	518	$	443	$	6	$	967
C&I	752		165		15		932
Other	25		—		—		25
Total retail	1,295		608		21		1,924
Wholesale	135		—		—		135
Transmission	37		—		—		37
Other	23		83		—		106
Total revenue from contracts with customers	1,490		691		21		2,202
Alternative revenue and other	70		62		1		133
Total revenues	$	1,560	$	753	$	22	$	2,335

	Six Months Ended June 30, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	481	$	335	$	6	$	822
C&I	704		117		15		836
Other	24		—		—		24
Total retail	1,209		452		21		1,682
Wholesale	89		—		—		89
Transmission	27		—		—		27
Other	29		53		—		82
Total revenue from contracts with customers	1,354		505		21		1,880
Alternative revenue and other	73		13		2		88
Total revenues	$	1,427	$	518	$	23	$	1,968

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Income Taxes

6 Months Ended

Jun. 30, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Note 7 to the consolidated financial statements included in PSCo’s Annual Report on Form 10-K for the year ended Dec. 31, 2020 represents, in all material respects, the current status of other income tax matters except to the extent noted below and are incorporated herein by reference.

Difference between the statutory rate and ETR:

	Six Months Ended June 30
	2021		2020 (a)
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	3.6		3.7
(Decreases) increases in tax from:
Wind PTCs	(15.1)		(9.8)
Plant regulatory differences (b)	(4.5)		(4.7)
Other (net)	(0.6)		(0.7)
Effective income tax rate	4.4	%	9.5	%

(a)Prior periods have been restated to conform to current year presentation.

(b)Regulatory differences for income tax primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit of excess deferred credits are offset by corresponding revenue reductions.

Federal Audits — PSCo is a member of the Xcel Energy affiliated group that files a consolidated federal income tax return. Statute of limitations applicable to Xcel Energy’s consolidated federal income tax returns expire as follows:

Tax Years	Expiration
2014 — 2016	January 2022
2017	September 2021

Additionally, the statute of limitations related to a federal tax loss carryback claim filed in 2020 has been extended. 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.

State Audits — PSCo is a member of the Xcel Energy affiliated group that files consolidated state income tax returns. As of June 30, 2021, PSCo’s earliest open tax year subject to examination by state taxing authorities under applicable statutes of limitations is 2009. As of June 30, 2021, there are no state income tax audits in progress.

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

Unrecognized tax benefits — permanent vs temporary:

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Unrecognized tax benefit — Permanent tax positions	$	8	$	7
Unrecognized tax benefit — Temporary tax positions	2		2
Total unrecognized tax benefit	$	10	$	9

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

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
NOL and tax credit carryforwards	$	(9)	$	(8)

As the IRS and state audits resume, it is reasonably possible that the amount of unrecognized tax benefit could decrease up to approximately $3 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)	June 30, 2021		Dec. 31, 2020
Payable for interest related to unrecognized tax benefits at beginning of period	$	—	$	(1)
Interest benefit related to unrecognized tax benefits	—		1
Payable for interest related to unrecognized tax benefits at end of period	$	—	$	—

No amounts were accrued for penalties related to unrecognized tax benefits as of June 30, 2021 or Dec. 31, 2020.

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Fair Value of Financial Assets and Liabilities

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

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 net asset value.

Interest rate derivatives — The fair values of interest rate derivatives are based on broker quotes that utilize current market interest rate forecasts.

Commodity derivatives — The 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 inputs on a valuation is evaluated and may result in Level 3 classification.

Derivative Instruments Fair Value Measurements

PSCo 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 — PSCo enters into various instruments that 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, with changes in fair value prior to settlement recorded as other comprehensive income.

At June 30, 2021, accumulated other comprehensive loss related to settled interest rate derivatives included $1 million of net losses expected to be reclassified into earnings during the next 12 months as the hedged transactions impact earnings, including forecasted amounts for unsettled hedges, as applicable.

Wholesale and Commodity Trading Risk — PSCo conducts 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. PSCo 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 the activities governed by this policy. Sharing of any margins is determined through state regulatory proceedings as well as the operation of the FERC approved joint operating agreement.

Commodity Derivatives — PSCo 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 and vehicle fuel.

PSCo enters 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. The classification as a regulatory asset or liability, if applicable, is based on approved regulatory recovery mechanisms.

As of June 30, 2021, PSCo had no commodity contracts designated as cash flow hedges.

PSCo 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 and options:

(Amounts in Millions) (a)(b)	June 30, 2021	Dec. 31, 2020
Megawatt hours of electricity	20	17
Million British thermal units of natural gas	86	93

(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 — PSCo continuously monitors the creditworthiness of the 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. The impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented on the consolidated balance sheets.

PSCo’s most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to its wholesale, trading and non-trading commodity activities.

At June 30, 2021, five of PSCo’s ten most significant counterparties for these activities, comprising $80 million, or 49%, of this credit exposure, had investment grade credit ratings from S&P Global Ratings, Moody’s Investor Services or Fitch Ratings. Four of the ten most significant counterparties, comprising $16 million, or 10%, of this credit exposure, were not rated by these external ratings agencies, but based on PSCo’s internal analysis, had credit quality consistent with investment grade. One of these significant counterparties, comprising $46 million, or 28%, of this credit exposure, had credit quality less than investment grade, based on internal analysis. Seven of these significant counterparties are independent system operators, municipal or cooperative electric entities, Regional Transmission Organizations or other utilities.

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
Three Months Ended June 30, 2021
Other derivative instruments
Natural gas commodity	$	—	$	(2)
Total	$	—	$	(2)
Six Months Ended June 30, 2021
Other derivative instruments
Natural gas commodity	$	—	$	(2)
Total	$	—	$	(2)
Three Months Ended June 30, 2020
Other derivative instruments
Natural gas commodity	$	—	$	(3)
Total	$	—	$	(3)
Six Months Ended June 30, 2020
Other derivative instruments
Natural gas commodity	$	—	$	(3)
Total	$	—	$	(3)

	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)
Three Months Ended June 30, 2021
Other derivative instruments
Commodity trading	$	—		$	—		$	10	(b)
Total	$	—		$	—		$	10
Six Months Ended June 30, 2021
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	14	(b)
Natural gas commodity	—			6		(c)	(6)		(c)
Total	$	—		$	6		$	8

Three Months Ended June 30, 2020
Other derivative instruments
Commodity trading	$	—		$	—		$	(1)	(b)
Total	$	—		$	—		$	(1)
Six Months Ended June 30, 2020
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	(5)	(b)
Natural gas commodity	—			3		(c)	(3)		(c)
Total	$	—		$	3		$	(8)

(a)    Amounts are recorded to interest charges.

(b)    Amounts are 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 for both the three and six months ended June 30, 2021 and 2020, included no settlement gains or 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. The derivative settlement losses for both the three and six months ended June 30, 2021 and 2020 relate to natural gas operations and were recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

PSCo had no derivative instruments designated as fair value hedges during the three and six months ended June 30, 2021 and 2020.

Credit Related Contingent Features — Contract provisions for derivative instruments that PSCo enters into, 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 PSCo’s credit ratings are downgraded below its investment grade credit rating by any of the major credit rating agencies. At June 30, 2021 and Dec. 31, 2020, there were no derivative liabilities with such underlying contract provisions. Certain contracts also contain cross default provisions that may require the posting of collateral or settlement of the contracts if there was a failure under the other financing arrangements related to payment terms or other covenants. As of June 30, 2021 and Dec. 31, 2020, there were approximately $20 million and $46 million of derivative liabilities with such underlying contract provisions, respectively.

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 PSCo’s ability to fulfill its contractual obligations is reasonably expected to be impaired. PSCo had no collateral posted related to adequate assurance clauses in derivative contracts as of June 30, 2021 and Dec. 31, 2020.

Recurring Fair Value Measurements — PSCo’s derivative assets and liabilities measured at fair value on a recurring basis:

	June 30, 2021												Dec. 31, 2020
	Fair Value						Fair Value Total		Netting (a)		Total		Fair Value						Fair Value Total		Netting (a)		Total
(Millions of Dollars)	Level 1		Level 2		Level 3								Level 1		Level 2		Level 3
Current derivative assets
Other derivative instruments:
Commodity trading	$	11	$	145	$	1	$	157	$	(129)	$	28	$	1	$	41	$	1	$	43	$	(28)	$	15
Natural gas commodity	—		8		—		8		—		8		—		6		—		6		—		6
Total current derivative assets	$	11	$	153	$	1	$	165	$	(129)	$	36	$	1	$	47	$	1	$	49	$	(28)	$	21
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	5	$	80	$	29	$	114	$	(74)	$	40	$	1	$	27	$	8	$	36	$	(20)	$	16
Total noncurrent derivative assets	$	5	$	80	$	29	$	114	$	(74)	$	40	$	1	$	27	$	8	$	36	$	(20)	$	16

	June 30, 2021												Dec. 31, 2020
	Fair Value						Fair Value Total		Netting (a)		Total		Fair Value						Fair Value Total		Netting (a)		Total
(Millions of Dollars)	Level 1		Level 2		Level 3								Level 1		Level 2		Level 3
Current derivative liabilities
Other derivative instruments:
Commodity trading	$	7	$	148	$	10	$	165	$	(133)	$	32	$	1	$	46	$	7	$	54	$	(33)	$	21
Natural gas commodity	—		3		—		3		—		3		—		6		—		6		—		6
Total current derivative liabilities	$	7	$	151	$	10	$	168	$	(133)	$	35	$	1	$	52	$	7	$	60	$	(33)	$	27
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	2	$	50	$	81	$	133	$	(87)	$	46	$	1	$	24	$	46	$	71	$	(20)	$	51
Total noncurrent derivative assets	$	2	$	50	$	81	$	133	$	(87)	$	46	$	1	$	24	$	46	$	71	$	(20)	$	51

(a)PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2021 and Dec. 31, 2020. At both June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include rights to reclaim cash collateral of $16 million and $5 million, respectively. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

Changes in Level 3 commodity derivatives:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Balance at April 1	$	(38)	$	(15)
Settlements	—		—
Net transactions recorded during the period:
Losses recognized in earnings (a)	(23)		(2)
Balance at June 30	$	(61)	$	(17)
	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Balance at Jan. 1	$	(44)	$	(13)
Settlements	(1)		(1)
Net transactions recorded during the period:
Losses recognized in earnings (a)	(16)		(3)
Balance at June 30	$	(61)	$	(17)

(a)Presented amounts relate to instruments held at the end of the period. The consolidated income statement also includes gains and losses on Level 1 and 2 instruments, and Level 3 instruments settled during the period.

PSCo recognizes transfers between levels as of the beginning of each period. There were no transfers of amounts between levels for derivative instruments for the three and six months ended June 30, 2021 and 2020.

Fair Value of Long-Term Debt

Other financial instruments for which the carrying amount did not equal fair value:

	June 30, 2021				Dec. 31, 2020
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	6,464	$	7,426	$	5,724	$	7,040

Fair value of PSCo’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 June 30, 2021 and Dec. 31, 2020 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

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Benefit Plans and Other Postretirement Benefits

Components of Net Periodic Benefit Cost (Credit)

	Three Months Ended June 30
	2021		2020		2021		2020
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	8	$	8	$	—	$	—
Interest cost (a)	9		11		3		3
Expected return on plan assets (a)	(18)		(18)		(4)		(4)
Amortization of prior service credit (a)	—		(1)		(1)		(1)
Amortization of net loss (a)	8		8		1		—
Net periodic benefit cost (credit)	7		8		(1)		(2)
Effects of regulation	2		—		—		1
Net benefit cost (credit) recognized for financial reporting	$	9	$	8	$	(1)	$	(1)
	Six Months Ended June 30
	2021		2020		2021		2020
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	16	$	15	$	—	$	—
Interest cost (a)	19		23		6		6
Expected return on plan assets (a)	(36)		(35)		(8)		(9)
Amortization of prior service credit (a)	—		(1)		(2)		(2)
Amortization of net loss (a)	16		15		2		2
Net periodic benefit cost (credit)	15		17		(2)		(3)
Effects of regulation	2		—		1		1
Net benefit cost (credit) recognized for financial reporting	$	17	$	17	$	(1)	$	(2)

(a)     The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.

In January 2021, contributions of $125 million were made across four of Xcel Energy’s pension plans, of which $45 million was attributable to PSCo. Xcel Energy does not expect additional pension contributions during 2021.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

The following includes commitments, contingencies and unresolved contingencies that are material to PSCo’s financial position.

Legal

PSCo is involved in various litigation matters in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for losses probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to 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, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, would have a material effect on PSCo’s consolidated financial statements. Legal fees are generally 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 involving multiple plaintiffs 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.

Two cases remain active which include an MDL matter consisting of a Colorado purported class (Breckenridge) and a Wisconsin purported class (Arandell Corp.).

Breckenridge/Colorado — In February 2019, the MDL panel remanded Breckenridge back to the U.S. District Court in Colorado. Settlement of approximately $3 million was reached in February 2021. The parties have sought and are awaiting court approval of the settlement. A hearing was held on July 22, 2021. A decision is anticipated in Q3.

Arandell Corp. — The trial has been vacated and will be rescheduled after the court rules on the pending motions for reconsideration and for class certification. Xcel Energy has concluded that a loss is remote for the remaining lawsuit.

Rate Matters

Gas Cost Adjustment NOPR — In June 2021, the CPUC issued a NOPR addressing the recovery of costs through the GCA. The proposed rule would establish an annual forecast of GCA costs for each utility and allow each utility to recover only 90%-95% of any costs in excess of the forecasted amount. The proposed rule would allow utilities to earn an incentive equal to an undefined portion of any savings relative to forecasted costs. Initial comments were due July 23, 2021, reply comments are due Aug. 6, 2021 and a hearing is scheduled for Aug. 26, 2021. A CPUC decision in expected in the third quarter of 2021.

Environmental

MGP, Landfill and Disposal Sites

PSCo is investigating, remediating or performing post-closure actions at three MGP, landfill or other disposal sites across its service territory.

PSCo has recognized its best estimate of costs/liabilities from final resolution of these issues, however, the outcome and timing is unknown. In addition, there may be insurance recovery and/or recovery from other potentially responsible parties, offsetting a portion of costs incurred.

Environmental Requirements — Water and Waste

Coal Ash Regulation — PSCo’s operations are subject to federal and state regulations that impose requirements for handling, storage, treatment and disposal of solid waste. Under the CCR Rule, utilities are required to complete groundwater sampling around their CCR landfills and surface impoundments. Currently, PSCo has five regulated ash units in operation.

PSCo is conducting groundwater sampling and monitoring and implementing assessment of corrective measures at certain CCR landfills and surface impoundments. Increases above background concentrations were detected at four locations. Based on further assessments, PSCo is evaluating options for corrective action at two locations, one of which indicates potential offsite impacts to groundwater. The total cost is uncertain, but could be up to $35 million. PSCo is continuing to assess the financial and regulatory impacts.

In August 2020, the EPA published its final rule to implement closure by April 2021 for all CCR impoundments affected by the August 2018 D.C. Circuit ruling. This final rule required PSCo to expedite closure plans for one impoundment.

PSCo also built an alternative collection and treatment system to remove the Comanche Station bottom ash pond from service. The total cost of the alternate treatment system is approximately $25 million. PSCo worked expeditiously to meet the April 11, 2021 deadline, but was not able to remove the pond from service until June 18, 2021. PSCo expects to negotiate a compliance order with the EPA. PSCo will also now proceed with closure of the pond, with an estimated cost of $3 million.

Closure costs for existing impoundments are included in the calculation of the asset retirement obligation.

Leases

PSCo evaluates contracts that may contain leases, including PPAs and arrangements for the use of office space and other facilities, vehicles and equipment. A contract contains a lease if it conveys the exclusive right to control the use of a specific asset.

Components of lease expense:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Operating leases
PPA capacity payments	$	26	$	25
Other operating leases (a)	3		3
Total operating lease expense (b)	$	29	$	28
Finance leases
Amortization of ROU assets	$	2	$	2
Interest expense on lease liability	4		4
Total finance lease expense	$	6	$	6

(a)Includes immaterial short-term lease expense for 2021 and 2020.

(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Operating leases
PPA capacity payments	$	51	$	49
Other operating leases (a)	7		7
Total operating lease expense (b)	$	58	$	56
Finance leases
Amortization of ROU assets	$	4	$	3
Interest expense on lease liability	8		9
Total finance lease expense	$	12	$	12

(a)Includes short-term lease expense of $1 million for 2021 and 2020, respectively.

(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

Commitments under operating and finance leases as of June 30, 2021:

(Millions of Dollars)	PPA Operating Leases		Other Operating Lease		Total Operating Leases		Finance Leases
Total minimum obligation	$	493	$	61	$	554	$	472
Interest component of obligation	(65)		(7)		(72)		(344)
Present value of minimum obligation	$	428	$	54	482		128
Less current portion					(98)		(5)
Noncurrent operating and finance lease liabilities					$	384	$	123

VIEs 

Under certain PPAs, PSCo purchases power from IPPs for which PSCo is required to reimburse fuel costs, or to participate in tolling arrangements under which PSCo procures the natural gas required to produce the energy that it purchases. These specific PPAs create a variable interest in the IPP.

PSCo had approximately 1,518 MW of capacity under long-term PPAs at both June 30, 2021 and Dec. 31, 2020 with entities that have been determined to be VIEs. PSCo concluded that these entities are not required to be consolidated in its financial statements because it does not have the power to direct the activities that most significantly impact the entities’ economic performance. The PPAs have expiration dates through 2032.

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Other Comprehensive Income

6 Months Ended

Jun. 30, 2021

Stockholders' Equity Note [Abstract]

Other Comprehensive Income

Changes in accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended June 30, 2021						Three Months Ended June 30, 2020
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at April 1	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $—, $—, $— and $—, respectively) (a)	—		—		—		—		—		—
Net current period other comprehensive income	—		—		—		—		—		—
Accumulated other comprehensive loss at June 30	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)

(a) Included in interest charges

	Six Months Ended June 30, 2021						Six Months Ended June 30, 2020
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1	$	(23)	$	(1)	$	(24)	$	(25)	$	(2)	$	(27)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $—, $—, $— and $—, respectively) (a)	1		—		1		1		—		1
Net current period other comprehensive income	1		—		1		1		—		1
Accumulated other comprehensive loss at June 30	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)

(a) Included in interest charges

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Segment Information

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Segment Information

PSCo evaluates performance 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.

PSCo has the following reportable segments:

•Regulated Electric — The regulated electric utility segment generates electricity which is transmitted and distributed in Colorado. This segment includes sales for resale and provides wholesale transmission service to various entities in the United States. Regulated electric utility also includes PSCo’s wholesale commodity and trading operations.

•Regulated Natural Gas — The regulated natural gas utility segment transports, stores and distributes natural gas in portions of Colorado.

PSCo also presents All Other, which includes operating segments with revenues below the necessary quantitative thresholds. Those operating segments primarily include steam revenue, appliance repair services and non-utility real estate activities.

Asset and capital expenditure information is not provided for PSCo’s reportable segments because, as an integrated electric and natural gas utility, PSCo operates significant assets that are not dedicated to a specific business segment and 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.

To report income from operations for regulated electric and regulated natural gas utility segments, the majority of costs are directly assigned to each segment. However, some costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators. A general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

PSCo’s segment information:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues	$	827	$	715
Net income	107		89
Regulated Natural Gas
Total revenues	$	338	$	186
Net income	30		16
All Other
Total revenues (a)	$	9	$	10
Net (loss) income	(3)		3
Consolidated Total
Total revenues (a)	$	1,174	$	911
Net income	134		108

(a)    Total revenues include $1 million of other affiliate revenue for both the three months ended June 30, 2021 and 2020.

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues	$	1,560	$	1,427
Net income	188		163
Regulated Natural Gas
Total revenues	$	753	$	518
Net income	114		68
All Other
Total revenues (a)	$	22	$	23
Net (loss) income	(1)		6
Consolidated Total
Total revenues (a)	$	2,335	$	1,968
Net income	301		237

(a)    Total revenues include $2 million of other affiliate revenue for both the six months ended June 30, 2021 and 2020.

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Selected Balance Sheet Data (Tables)

6 Months Ended

Jun. 30, 2021

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Accounts receivable, net
Accounts receivable	$	358	$	371
Less allowance for bad debts	(34)		(29)
Accounts receivable, net	$	324	$	342

Inventories

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Inventories
Materials and supplies	$	64	$	63
Fuel	67		73
Natural gas	35		53
Total inventories	$	166	$	189

Property, Plant and Equipment, Net

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Property, plant and equipment, net
Electric plant	$	16,020	$	15,736
Natural gas plant	5,173		5,037
Common and other property	1,201		1,191
Plant to be retired (a)	200		225
Construction work in progress	721		510
Total property, plant and equipment	23,315		22,699
Less accumulated depreciation	(5,470)		(5,229)
Property, plant and equipment, net	$	17,845	$	17,470

(a)Includes regulator-approved retirements of Comanche Units 1 and 2 and jointly owned Craig Unit 1. Also includes PSCo’s planned retirement of jointly owned Craig Unit 2.

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Borrowings and Other Financing Instruments (Tables)

6 Months Ended

Jun. 30, 2021

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021		Year Ended Dec. 31, 2020
Borrowing limit	$	700	$	700
Amount outstanding at period end	—		136
Average amount outstanding	—		30
Maximum amount outstanding	—		230
Weighted average interest rate, computed on a daily basis	N/A		1.59		%
Weighted average interest rate at period end	N/A		0.20

Credit Facilities

At June 30, 2021, PSCo had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	700	$	8	$	692

(a)    Expires in June 2024.

(b)    Includes outstanding commercial paper and letters of credit.

Money Pool

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Money pool borrowings for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021			Year Ended Dec. 31, 2020
Borrowing limit	$	250		$	250
Amount outstanding at period end	—			57
Average amount outstanding	—			59
Maximum amount outstanding	8			250
Weighted average interest rate, computed on a daily basis	0.04		%	0.60		%
Weighted average interest rate at period end	N/A			0.07

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Revenues (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

PSCo’s operating revenues consisted of the following:

	Three Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	272	$	204	$	3	$	479
C&I	426		81		6		513
Other	13		—		—		13
Total retail	711		285		9		1,005
Wholesale	48		—		—		48
Transmission	19		—		—		19
Other	14		38		—		52
Total revenue from contracts with customers	792		323		9		1,124
Alternative revenue and other	35		15		—		50
Total revenues	$	827	$	338	$	9	$	1,174

	Three Months Ended June 30, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	244	$	118	$	3	$	365
C&I	351		39		6		396
Other	12		—		—		12
Total retail	607		157		9		773
Wholesale	42		—		—		42
Transmission	14		—		—		14
Other	14		23		—		37
Total revenue from contracts with customers	677		180		9		866
Alternative revenue and other	38		6		1		45
Total revenues	$	715	$	186	$	10	$	911

	Six Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	518	$	443	$	6	$	967
C&I	752		165		15		932
Other	25		—		—		25
Total retail	1,295		608		21		1,924
Wholesale	135		—		—		135
Transmission	37		—		—		37
Other	23		83		—		106
Total revenue from contracts with customers	1,490		691		21		2,202
Alternative revenue and other	70		62		1		133
Total revenues	$	1,560	$	753	$	22	$	2,335

	Six Months Ended June 30, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	481	$	335	$	6	$	822
C&I	704		117		15		836
Other	24		—		—		24
Total retail	1,209		452		21		1,682
Wholesale	89		—		—		89
Transmission	27		—		—		27
Other	29		53		—		82
Total revenue from contracts with customers	1,354		505		21		1,880
Alternative revenue and other	73		13		2		88
Total revenues	$	1,427	$	518	$	23	$	1,968

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2021

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Difference between the statutory rate and ETR:

	Six Months Ended June 30
	2021		2020 (a)
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	3.6		3.7
(Decreases) increases in tax from:
Wind PTCs	(15.1)		(9.8)
Plant regulatory differences (b)	(4.5)		(4.7)
Other (net)	(0.6)		(0.7)
Effective income tax rate	4.4	%	9.5	%

(a)Prior periods have been restated to conform to current year presentation.

(b)Regulatory differences for income tax primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit of excess deferred credits are offset by corresponding revenue reductions.

Summary of Statute of Limitations Applicable to Open Tax Years [Table Text Block]

Federal Audits — PSCo is a member of the Xcel Energy affiliated group that files a consolidated federal income tax return. Statute of limitations applicable to Xcel Energy’s consolidated federal income tax returns expire as follows:

Tax Years	Expiration
2014 — 2016	January 2022
2017	September 2021

Reconciliation of Unrecognized Tax Benefits

Unrecognized tax benefits — permanent vs temporary:

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Unrecognized tax benefit — Permanent tax positions	$	8	$	7
Unrecognized tax benefit — Temporary tax positions	2		2
Total unrecognized tax benefit	$	10	$	9

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)	June 30, 2021		Dec. 31, 2020
NOL and tax credit carryforwards	$	(9)	$	(8)

Interest Payable related to Unrecognized Tax Benefits [Table Text Block]

Interest payable related to unrecognized tax benefits:

(Millions of Dollars)	June 30, 2021		Dec. 31, 2020
Payable for interest related to unrecognized tax benefits at beginning of period	$	—	$	(1)
Interest benefit related to unrecognized tax benefits	—		1
Payable for interest related to unrecognized tax benefits at end of period	$	—	$	—

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Fair Value of Financial Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Gross Notional Amounts of Commodity Forwards and Options

Gross notional amounts of commodity forwards and options:

(Amounts in Millions) (a)(b)	June 30, 2021	Dec. 31, 2020
Megawatt hours of electricity	20	17
Million British thermal units of natural gas	86	93

(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.

Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income

	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)
Three Months Ended June 30, 2021
Other derivative instruments
Commodity trading	$	—		$	—		$	10	(b)
Total	$	—		$	—		$	10
Six Months Ended June 30, 2021
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	14	(b)
Natural gas commodity	—			6		(c)	(6)		(c)
Total	$	—		$	6		$	8

Three Months Ended June 30, 2020
Other derivative instruments
Commodity trading	$	—		$	—		$	(1)	(b)
Total	$	—		$	—		$	(1)
Six Months Ended June 30, 2020
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	(5)	(b)
Natural gas commodity	—			3		(c)	(3)		(c)
Total	$	—		$	3		$	(8)

(a)    Amounts are recorded to interest charges.

(b)    Amounts are 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 for both the three and six months ended June 30, 2021 and 2020, included no settlement gains or 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. The derivative settlement losses for both the three and six months ended June 30, 2021 and 2020 relate to natural gas operations and were recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis by Hierarchy Level

	June 30, 2021												Dec. 31, 2020
	Fair Value						Fair Value Total		Netting (a)		Total		Fair Value						Fair Value Total		Netting (a)		Total
(Millions of Dollars)	Level 1		Level 2		Level 3								Level 1		Level 2		Level 3
Current derivative assets
Other derivative instruments:
Commodity trading	$	11	$	145	$	1	$	157	$	(129)	$	28	$	1	$	41	$	1	$	43	$	(28)	$	15
Natural gas commodity	—		8		—		8		—		8		—		6		—		6		—		6
Total current derivative assets	$	11	$	153	$	1	$	165	$	(129)	$	36	$	1	$	47	$	1	$	49	$	(28)	$	21
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	5	$	80	$	29	$	114	$	(74)	$	40	$	1	$	27	$	8	$	36	$	(20)	$	16
Total noncurrent derivative assets	$	5	$	80	$	29	$	114	$	(74)	$	40	$	1	$	27	$	8	$	36	$	(20)	$	16

	June 30, 2021												Dec. 31, 2020
	Fair Value						Fair Value Total		Netting (a)		Total		Fair Value						Fair Value Total		Netting (a)		Total
(Millions of Dollars)	Level 1		Level 2		Level 3								Level 1		Level 2		Level 3
Current derivative liabilities
Other derivative instruments:
Commodity trading	$	7	$	148	$	10	$	165	$	(133)	$	32	$	1	$	46	$	7	$	54	$	(33)	$	21
Natural gas commodity	—		3		—		3		—		3		—		6		—		6		—		6
Total current derivative liabilities	$	7	$	151	$	10	$	168	$	(133)	$	35	$	1	$	52	$	7	$	60	$	(33)	$	27
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	2	$	50	$	81	$	133	$	(87)	$	46	$	1	$	24	$	46	$	71	$	(20)	$	51
Total noncurrent derivative assets	$	2	$	50	$	81	$	133	$	(87)	$	46	$	1	$	24	$	46	$	71	$	(20)	$	51

(a)PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2021 and Dec. 31, 2020. At both June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include rights to reclaim cash collateral of $16 million and $5 million, respectively. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation

Changes in Level 3 commodity derivatives:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Balance at April 1	$	(38)	$	(15)
Settlements	—		—
Net transactions recorded during the period:
Losses recognized in earnings (a)	(23)		(2)
Balance at June 30	$	(61)	$	(17)
	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Balance at Jan. 1	$	(44)	$	(13)
Settlements	(1)		(1)
Net transactions recorded during the period:
Losses recognized in earnings (a)	(16)		(3)
Balance at June 30	$	(61)	$	(17)

(a)Presented amounts relate to instruments held at the end of the period. The consolidated income statement also includes gains and losses on Level 1 and 2 instruments, and Level 3 instruments settled during the period.

Carrying Amount and Fair Value of Long-term Debt

Other financial instruments for which the carrying amount did not equal fair value:

	June 30, 2021				Dec. 31, 2020
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	6,464	$	7,426	$	5,724	$	7,040

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Benefit Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost (Credit)

Components of Net Periodic Benefit Cost (Credit)

	Three Months Ended June 30
	2021		2020		2021		2020
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	8	$	8	$	—	$	—
Interest cost (a)	9		11		3		3
Expected return on plan assets (a)	(18)		(18)		(4)		(4)
Amortization of prior service credit (a)	—		(1)		(1)		(1)
Amortization of net loss (a)	8		8		1		—
Net periodic benefit cost (credit)	7		8		(1)		(2)
Effects of regulation	2		—		—		1
Net benefit cost (credit) recognized for financial reporting	$	9	$	8	$	(1)	$	(1)
	Six Months Ended June 30
	2021		2020		2021		2020
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	16	$	15	$	—	$	—
Interest cost (a)	19		23		6		6
Expected return on plan assets (a)	(36)		(35)		(8)		(9)
Amortization of prior service credit (a)	—		(1)		(2)		(2)
Amortization of net loss (a)	16		15		2		2
Net periodic benefit cost (credit)	15		17		(2)		(3)
Effects of regulation	2		—		1		1
Net benefit cost (credit) recognized for financial reporting	$	17	$	17	$	(1)	$	(2)

(a)     The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.

^[1]

[1] The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.

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Commitment and Contingencies (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2021

Jun. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of Components of Lease Expense

Components of lease expense:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Operating leases
PPA capacity payments	$	26	$	25
Other operating leases (a)	3		3
Total operating lease expense (b)	$	29	$	28
Finance leases
Amortization of ROU assets	$	2	$	2
Interest expense on lease liability	4		4
Total finance lease expense	$	6	$	6

(a)Includes immaterial short-term lease expense for 2021 and 2020.

(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Operating leases
PPA capacity payments	$	51	$	49
Other operating leases (a)	7		7
Total operating lease expense (b)	$	58	$	56
Finance leases
Amortization of ROU assets	$	4	$	3
Interest expense on lease liability	8		9
Total finance lease expense	$	12	$	12

(a)Includes short-term lease expense of $1 million for 2021 and 2020, respectively.

(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

Schedule of Future Commitments under Operating Leases

Commitments under operating and finance leases as of June 30, 2021:

(Millions of Dollars)	PPA Operating Leases		Other Operating Lease		Total Operating Leases		Finance Leases
Total minimum obligation	$	493	$	61	$	554	$	472
Interest component of obligation	(65)		(7)		(72)		(344)
Present value of minimum obligation	$	428	$	54	482		128
Less current portion					(98)		(5)
Noncurrent operating and finance lease liabilities					$	384	$	123

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Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2021

Stockholders' Equity Note [Abstract]

Changes in Accumulated Other Comprehensive Loss, Net of Tax

Changes in accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended June 30, 2021						Three Months Ended June 30, 2020
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at April 1	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $—, $—, $— and $—, respectively) (a)	—		—		—		—		—		—
Net current period other comprehensive income	—		—		—		—		—		—
Accumulated other comprehensive loss at June 30	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)

(a) Included in interest charges

	Six Months Ended June 30, 2021						Six Months Ended June 30, 2020
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1	$	(23)	$	(1)	$	(24)	$	(25)	$	(2)	$	(27)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $—, $—, $— and $—, respectively) (a)	1		—		1		1		—		1
Net current period other comprehensive income	1		—		1		1		—		1
Accumulated other comprehensive loss at June 30	$	(22)	$	(1)	$	(23)	$	(24)	$	(2)	$	(26)

(a) Included in interest charges

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Results from Operations by Reportable Segment

PSCo’s segment information:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues	$	827	$	715
Net income	107		89
Regulated Natural Gas
Total revenues	$	338	$	186
Net income	30		16
All Other
Total revenues (a)	$	9	$	10
Net (loss) income	(3)		3
Consolidated Total
Total revenues (a)	$	1,174	$	911
Net income	134		108

(a)    Total revenues include $1 million of other affiliate revenue for both the three months ended June 30, 2021 and 2020.

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues	$	1,560	$	1,427
Net income	188		163
Regulated Natural Gas
Total revenues	$	753	$	518
Net income	114		68
All Other
Total revenues (a)	$	22	$	23
Net (loss) income	(1)		6
Consolidated Total
Total revenues (a)	$	2,335	$	1,968
Net income	301		237

(a)    Total revenues include $2 million of other affiliate revenue for both the six months ended June 30, 2021 and 2020.

^[1]

[1] Total revenues include $1 million of other affiliate revenue for both the three months ended June 30, 2021 and 2020.

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Accounting Pronouncements (Details) - USD ($) $ in Millions		6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Credit Losses, Topic 326 (ASC Topic 326)		$ 1
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Credit Losses, Topic 326 (ASC Topic 326)	$ 1	$ 1

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Selected Balance Sheet Data (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Accounts receivable, net
Accounts receivable	$ 358	$ 371
Less allowance for bad debts	(34)	(29)
Accounts receivable, net	$ 324	$ 342

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Selected Balance Sheet Data Balance Sheet Related Disclosures, Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Public Utilities, Inventory [Line Items]
Total inventories	$ 166	$ 189
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventories	64	63
Fuel
Public Utilities, Inventory [Line Items]
Inventories	67	73
Natural gas
Public Utilities, Inventory [Line Items]
Inventories	$ 35	$ 53

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Selected Balance Sheet Data Balance Sheet Related Disclosures, Property, Plant and Equipment (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 23,315	$ 22,699
Less accumulated depreciation		(5,470)	(5,229)
Property, plant and equipment, net		17,845	17,470
Electric plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		16,020	15,736
Natural gas plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		5,173	5,037
Common and other property
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		1,201	1,191
Plant to be retired
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	[1]	200	225
Construction work in progress
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 721	$ 510

[1] Includes regulator-approved retirements of Comanche Units 1 and 2 and jointly owned Craig Unit 1. Also includes PSCo’s planned retirement of jointly owned Craig Unit 2

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Borrowings and Other Financing Instruments - Short-Term Borrowings (Details) - USD ($)	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Short-term debt	$ 0		$ 136,000,000
Money Pool
Short-term Debt [Line Items]
Borrowing limit	250,000,000		250,000,000
Short-term debt	0		$ 57,000,000
Average amount outstanding	0	$ 59,000,000
Maximum amount outstanding	$ 8,000,000	$ 250,000,000
Weighted average interest rate, computed on a daily basis (percentage)	0.04%	0.60%
Short-term Debt, Weighted Average Interest Rate, at Point in Time			0.07%
Commercial Paper
Short-term Debt [Line Items]
Borrowing limit	$ 700,000,000		$ 700,000,000
Short-term debt	0		$ 136,000,000
Average amount outstanding	0	$ 30,000,000
Maximum amount outstanding	$ 0	$ 230,000,000
Weighted average interest rate, computed on a daily basis (percentage)		1.59%
Short-term Debt, Weighted Average Interest Rate, at Point in Time			0.20%

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Borrowings and Other Financing Instruments - Letters of Credit (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Term of letters of credit (in years)	1 year
Short-term debt	$ 0	$ 136
Letter of Credit
Line of Credit Facility [Line Items]
Short-term debt	$ 8	$ 8
Letter of Credit | Letter of Credit
Line of Credit Facility [Line Items]
Term of letters of credit (in years)	1 year

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Borrowings and Other Financing Instruments - Credit Facility (Details)		6 Months Ended
		Jun. 30, 2021 USD ($) Plan	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Term of letters of credit (in years)		1 year
Number of extension you can request | Plan		2
Credit Facility
Line of Credit Facility [Line Items]
Credit Facility	[1]	$ 700,000,000
Drawn	[2]	8,000,000
Available		692,000,000
Direct advances on the credit facility outstanding		$ 0	$ 0

[1] Expires in June 2024.

[2] Includes outstanding commercial paper and letters of credit.

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Borrowings and Other Financing Instruments - Borrowings and Other Financing Instruments, Long-Term Borrowings and Other Financing Instruments (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Mar. 01, 2021
Debt Instrument [Line Items]
Term of letters of credit (in years)	1 year
Bonds [Member] | Series Due June 15, 2031 | PSCo [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage		1.875%

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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 1,124	$ 866	$ 2,202	$ 1,880
Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,005	773	1,924	1,682
Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	479	365	967	822
Retail | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	513	396	932	836
Retail | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	13	12	25	24
Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	48	42	135	89
Transmission Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19	14	37	27
Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	52	37	106	82
Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	50	45	133	88
Regulated Electric | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	792	677	1,490	1,354
Regulated Electric | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	711	607	1,295	1,209
Regulated Electric | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	272	244	518	481
Regulated Electric | Retail | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	426	351	752	704
Regulated Electric | Retail | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	13	12	25	24
Regulated Electric | Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	48	42	135	89
Regulated Electric | Transmission Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19	14	37	27
Regulated Electric | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	14	14	23	29
Regulated Electric | Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	35	38	70	73
Regulated Natural Gas | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	323	180	691	505
Regulated Natural Gas | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	285	157	608	452
Regulated Natural Gas | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	204	118	443	335
Regulated Natural Gas | Retail | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	81	39	165	117
Regulated Natural Gas | Retail | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Regulated Natural Gas | Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Regulated Natural Gas | Transmission Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Regulated Natural Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	38	23	83	53
Regulated Natural Gas | Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	15	6	62	13
All Other | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9	9	21	21
All Other | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9	9	21	21
All Other | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3	3	6	6
All Other | Retail | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6	6	15	15
All Other | Retail | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
All Other | Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
All Other | Transmission Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
All Other | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
All Other | Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	0	1	1	2
Total revenues
Disaggregation of Revenue [Line Items]
Total revenues	1,174	911	2,335	1,968
Total revenues | Regulated Electric
Disaggregation of Revenue [Line Items]
Total revenues	827	715	1,560	1,427
Total revenues | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Total revenues	338	186	753	518
Total revenues | All Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 9	$ 10	$ 22	$ 23

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Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020		Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits			$ 10			$ 9
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	21.00%	[1]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent			3.60%	3.70%	[1]
Effective Income Tax Rate Reconciliation, Tax Credit, Percent			(15.10%)	(9.80%)	[1]
Effective Income Tax Rate Reconciliation, Other Regulatory Items, Percent	[2]		(4.50%)	(4.70%)	[1]
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent			(0.60%)	(0.70%)	[1]
Effective Income Tax Rate Reconciliation, Percent			4.40%	9.50%	[1]
State income tax adjustment			$ 0
Unrecognized Tax Benefits [Abstract]
Unrecognized tax benefit — Permanent tax positions			8			7
Unrecognized tax benefit — Temporary tax positions			2			2
Total unrecognized tax benefit			10			9
NOL and tax credit carryforwards			(9)			(8)
Upper bound of decrease in unrecognized tax benefit that is reasonably possible			3
Amounts accrued for penalties related to unrecognized tax benefits			0			$ 0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Payable for interest related to unrecognized tax benefits at beginning of period		$ 0	0	$ (1)
Interest benefit related to unrecognized tax benefits		$ 1	0
Payable for interest related to unrecognized tax benefits at end of period			$ 0

[1] Prior periods have been restated to conform to current year presentation.

[2] Regulatory differences for income tax primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit of excess deferred credits are offset by corresponding revenue reductions.

XML

Fair Value of Financial Assets and Liabilities - Interest Rate Derivatives (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Cash Flow Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 1	$ 1
Interest Rate Swap
Derivative [Line Items]
Amount of accumulated other comprehensive gains (losses) related to interest rate derivatives expected to be reclassified into earnings within the next twelve months		1
Interest Rate | Cash Flow Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[1]	$ 1	$ 1

[1] Amounts are recorded to interest charges.

XML

Fair Value of Financial Assets and Liabilities - Commodity Derivatives (Details) MWh in Millions, MMBTU in Millions, $ in Millions		Jun. 30, 2021 USD ($) MMBTU MWh	Dec. 31, 2020 MMBTU MWh
cash flow hedge commodity [Member]
Derivative [Line Items]
Commodity contracts designated as cash flow hedges | $		$ 0
Electric Commodity (in megawatt hours)
Derivative [Line Items]
Derivative, Nonmonetary Notional amount | MWh	[1],[2]	20	17
Natural Gas Commodity (in million British thermal units)
Derivative [Line Items]
Derivative, Nonmonetary Notional amount | MMBTU	[1],[2]	86	93

[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 - Consideration of Credit Risk and Concentrations (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021 USD ($) Counterparty	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Counterparty	Jun. 30, 2020 USD ($)
Consideration of Credit Risk and Concentrations [Abstract]
Derivative instruments designated as fair value hedges		$ 0	$ 0	$ 0	$ 0
Other Derivative Instruments
Consideration of Credit Risk and Concentrations [Abstract]
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		(2)	(3)	(2)	(3)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0	0	0	0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0	(6)	3
Pre-tax gains (losses) recognized during the period in income		10	(1)	8	(8)
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0	0	0
Designated as Hedging Instrument | Cash Flow Hedges
Consideration of Credit Risk and Concentrations [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net				1	1
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)				0	0
Pre-tax gains (losses) recognized during the period in income				0	0
Natural Gas Commodity | Other Derivative Instruments
Consideration of Credit Risk and Concentrations [Abstract]
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		(2)	(3)	(2)	(3)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net				0	0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)	[1]			(6)	3
Pre-tax gains (losses) recognized during the period in income	[1]			(6)	(3)
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0	0	0
Commodity Trading | Other Derivative Instruments
Consideration of Credit Risk and Concentrations [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0	0	0	0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0	0	0
Pre-tax gains (losses) recognized during the period in income	[2]	10	(1)	14	(5)
Natural Gas | Other Derivative Instruments
Consideration of Credit Risk and Concentrations [Abstract]
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		$ 0	$ 0	0	0
Interest Rate | Designated as Hedging Instrument | Cash Flow Hedges
Consideration of Credit Risk and Concentrations [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[3]			1	1
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)				0	0
Pre-tax gains (losses) recognized during the period in income				$ 0	$ 0
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		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		7		7
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		5		5
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties		$ 80		$ 80
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		49.00%		49.00%
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		4		4
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties		$ 16		$ 16
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		10.00%		10.00%
Credit Concentration Risk | External Credit Rating, Non 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		1		1
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties		$ 46		$ 46
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		28.00%		28.00%

[1] Amounts for both the three and six months ended June 30, 2021 and 2020, included no settlement gains or 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. The derivative settlement losses for both the three and six months ended June 30, 2021 and 2020 relate to natural gas operations and were recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

[2] Amounts are 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 are recorded to interest charges.

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Fair Value of Financial Assets and Liabilities - Credit Related Contingent Features (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
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
Derivative, Gross Liability with Cross Default Position, Aggregate Fair Value	$ 20	$ 46

XML

Fair Value of Financial Assets and Liabilities - Recurring Fair Value Measurements (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Return Cash Collateral		$ 0	$ 0
Reclaim Cash Collateral		16	5
Fair Value Measured on a Recurring Basis | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		165	49
Netting	[1]	(129)	(28)
Derivative Asset, Net		36	21
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		11	1
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		153	47
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		1	1
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		157	43
Netting	[1]	(129)	(28)
Derivative Asset, Net		28	15
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		8	6
Netting	[1]	0	0
Derivative Asset, Net		8	6
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 1 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		11	1
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 1 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		0	0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 2 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		145	41
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 2 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		8	6
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 3 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		1	1
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 3 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		0	0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		114	36
Netting	[1]	(74)	(20)
Derivative Asset, Net		40	16
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		5	1
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		80	27
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		29	8
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		114	36
Netting	[1]	(74)	(20)
Derivative Asset, Net		40	16
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 1 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		5	1
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 2 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		80	27
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 3 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		29	8
Fair Value Measured on a Recurring Basis | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		168	60
Netting	[1]	(133)	(33)
Derivative Liability, Net		35	27
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 1
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		7	1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 2
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		151	52
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 3
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		10	7
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		165	54
Netting	[1]	(133)	(33)
Derivative Liability, Net		32	21
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		3	6
Netting	[1]	0	0
Derivative Liability, Net		3	6
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 1 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		7	1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 1 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		0	0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 2 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		148	46
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 2 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		3	6
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 3 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		10	7
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 3 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		0	0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		133	71
Netting	[1]	(87)	(20)
Derivative Liability, Net		46	51
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 1
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		2	1
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 2
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		50	24
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		81	46
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		133	71
Netting	[1]	(87)	(20)
Derivative Liability, Net		46	51
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 1 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		2	1
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 2 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		50	24
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 3 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		$ 81	$ 46

[1] PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2021 and Dec. 31, 2020. At both June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include rights to reclaim cash collateral of $16 million and $5 million, respectively. The counterparty netting amounts presented exclude 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 ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ (38)	$ (15)	$ (44)	$ (13)
Settlements		0	0	(1)	(1)
(Losses) gains recognized in earnings	[1]	(23)	(2)	(16)	(3)
Ending Balance		(61)	(17)	(61)	(17)
Transfers Level 3, Net		$ 0	$ 0	$ 0	$ 0

[1] Presented amounts relate to instruments held at the end of the period. The consolidated income statement also includes gains and losses on Level 1 and 2 instruments, and Level 3 instruments settled during the period.

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Fair Value of Financial Assets and Liabilities - Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 6,464	$ 5,724
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value	$ 7,426	$ 7,040

XML

Benefit Plans and Other Postretirement Benefits (Details) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
		Jan. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jan. 01, 2021 Plan
Pension Plan [Member]
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Service cost			$ 8.0	$ 8.0	$ 16.0	$ 15.0
Interest Cost	[1]		9.0	11.0	19.0	23.0
Expected return on Plan Assets	[1]		(18.0)	(18.0)	(36.0)	(35.0)
Amortization of prior service credit	[1]		0.0	(1.0)	0.0	(1.0)
Amortization of net loss	[1]		8.0	8.0	16.0	15.0
Net periodic benefit cost (credit)			7.0	8.0	15.0	17.0
Effects of regulation			2.0	0.0	2.0	0.0
Net benefit cost (credit) recognized for financial reporting			9.0	8.0	17.0	17.0
Total contributions to the pension plans during the period		$ 45.0
Pension Plan [Member] | Xcel Energy Inc.
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Total contributions to the pension plans during the period		$ 125.0
Number of Xcel Energy's pension plans to which contributions were made | Plan							4
Other Postretirement Benefits Plan [Member]
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Service cost			0.0	0.0	0.0	0.0
Interest Cost	[1]		3.0	3.0	6.0	6.0
Expected return on Plan Assets	[1]		(4.0)	(4.0)	(8.0)	(9.0)
Amortization of prior service credit	[1]		(1.0)	(1.0)	(2.0)	(2.0)
Amortization of net loss	[1]		1.0	0.0	2.0	2.0
Net periodic benefit cost (credit)			(1.0)	(2.0)	(2.0)	(3.0)
Effects of regulation			0.0	1.0	1.0	1.0
Net benefit cost (credit) recognized for financial reporting			$ (1.0)	$ (1.0)	$ (1.0)	$ (2.0)

[1] The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.

XML

Commitments and Contingencies - Gas Trading Litigation (Details) number in Millions	Jun. 30, 2021
Breckenridge Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	3

XML

Commitments and Contingencies - Gas Cost Adjustment NOPR (Details)	Jun. 30, 2021
Loss Contingencies [Line Items]
recoverability of costs in excess of forecasted amount - low end	9000.00%
recoverability of costs in excess of forecasted amount - high end	9500.00%
Breckenridge Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	3,000,000

XML

Commitments and Contingencies - MGP, Landfill and Disposal Sites (Details)	Jun. 30, 2021
Other MGP, Landfill, or Disposal Sites
Loss Contingencies [Line Items]
Number of identified MGP sites under current investigation and/or remediation	3

XML

Commitments and Contingencies - Environmental Requirements - Water and Waste (Details) $ in Millions	Jun. 30, 2021 USD ($)
Federal Coal Ash Regulation
Site Contingency [Line Items]
Number of sites where regulated ash units will still be in operation at a specified date	5
Number of sites where statistically significant increases over established groundwater standards exist	4
Number of sites where corrective action options are being evaluated for locations with statistically significant increases above background concentrations	2
Number of sites where monitoring results indicate potential offsite impacts to groundwater	1
Number of facilities where alternative storage capacity options consistent with the CCR Rule are being pursued	1
Federal Coal Ash Regulation [Domain] | PSCo [Member]
Site Contingency [Line Items]
Estimated cost to remediate groundwater sampling results	$ 35
Estimated cost of construction of an alternative collection and treatment system	25
Estimated cost to close Comanche station bottom ash pond	$ 3

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Commitments and Contingencies - Leases (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021		Jun. 30, 2020		Jun. 30, 2021		Jun. 30, 2020		Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 29	[1]	$ 28	[1]	$ 58	[2]	$ 56	[2]
Finance Lease, Right-of-Use Asset, Amortization	2		2		4		3
Finance Lease, Interest Expense	4		4		8		9
Finance Lease, Cost	6		6		12		12
Lessee, Operating Lease, Liability, Payments, Due	554				554
Total minimum obligation	472				472
Interest component of obligation	(72)				(72)
Finance Lease, Liability, Undiscounted Excess Amount	(344)				(344)
Operating Lease, Liability	482				482
Finance Lease, Liability	128				128
Less current portion	(98)				(98)				$ (97)
Less current portion	(5)				(5)
Operating lease liabilities	384				384				$ 432
Noncurrent operating and finance lease liabilities	123				123
Short-term Lease, Cost					1		1
PPAs
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	26		25		51		49
Lessee, Operating Lease, Liability, Payments, Due	493				493
Interest component of obligation	(65)				(65)
Operating Lease, Liability	428				428
Other
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	3	[3]	$ 3	[3]	7	[4]	$ 7	[4]
Lessee, Operating Lease, Liability, Payments, Due	61				61
Interest component of obligation	(7)				(7)
Operating Lease, Liability	$ 54				$ 54

[1] PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

[2] PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

[3] Includes immaterial short-term lease expense for 2021 and 2020.

[4] Includes short-term lease expense of $1 million for 2021 and 2020, respectively.

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VIEs (Details) - MW	Jun. 30, 2021	Jun. 30, 2020
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Other Commitments [Line Items]
Generating capacity under long term purchased power agreements (in MW)	1,518	1,518

XML

Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period			$ 7,592
Accumulated other comprehensive loss at end of period	$ 8,099		8,099
Income Tax Expense (Benefit)	3	$ 8	14	$ 25
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	(22)	(24)	(23)	(25)
Net current period other comprehensive loss	0	0	1	1
Accumulated other comprehensive loss at end of period	(22)	(24)	(22)	(24)
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income Tax Expense (Benefit)	0	0	0	0
Gains and Losses on Cash Flow Hedges | Interest Rate Swap
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Losses reclassified from net accumulated other comprehensive loss	0	0	(1)	(1)
Defined Benefit and Postretirement Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	(1)	(2)	(1)	(2)
Net current period other comprehensive loss	0	0	0	0
Accumulated other comprehensive loss at end of period	(1)	(2)	(1)	(2)
Defined Benefit and Postretirement Items | Interest Rate Swap
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Losses reclassified from net accumulated other comprehensive loss	0	0	0	0
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	(23)	(26)	(24)	(27)
Net current period other comprehensive loss	0	0	1	1
Accumulated other comprehensive loss at end of period	(23)	(26)	(23)	(26)
Total | Interest Rate Swap
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Losses reclassified from net accumulated other comprehensive loss	$ 0	$ 0	$ (1)	$ (1)

XML

Segment Information (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2021		Jun. 30, 2020		Jun. 30, 2021		Jun. 30, 2020
Segment Reporting Information [Line Items]
Net income		$ 134		$ 108		$ 301		$ 237
Unregulated Operating Revenue		9		10		22		23
Regulated and Unregulated Operating Revenue		1,174		911		2,335		1,968
Affiliate Revenue		1		1		2		2
Total revenues
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	[1]	1,174		911		2,335		1,968
Regulated Electric
Segment Reporting Information [Line Items]
Net income		107		89		188		163
Revenues Including Intersegment Revenues		827		715		1,560		1,427
Regulated Natural Gas
Segment Reporting Information [Line Items]
Net income		30		16		114		68
Revenues Including Intersegment Revenues		338		186		753		518
All Other
Segment Reporting Information [Line Items]
Net income		(3)		3		(1)		6
All Other | Total revenues
Segment Reporting Information [Line Items]
Unregulated Operating Revenue		$ 9	[2]	$ 10	[1]	$ 22	[1]	$ 23	[1]

[1] Total revenues include $1 million of other affiliate revenue for both the three months ended June 30, 2021 and 2020.

[2] Total revenues include $1 million of other affiliate revenue for both the three months ended June 30, 2021 and 2020.