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 Sept. 30, 2022

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)

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 Oct. 27, 2022
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	16
Item 4 —	Controls and Procedures	20
PART II — OTHER INFORMATION
Item 1 —	Legal Proceedings	20
Item 1A —	Risk Factors	20
Item 6 —	Exhibits	20
SIGNATURES		21

This Form 10-Q is filed by PSCo, a Colorado corporation. PSCo is a wholly owned subsidiary of Xcel Energy Inc. Additional information on Xcel Energy is available in various filings with the SEC. 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 its subsidiaries

Federal and State Regulatory Agencies
CPUC	Colorado Public Utilities Commission
D.C. Circuit	United States Court of Appeals for the District of Columbia Circuit
EPA	United States Environmental Protection Agency
FERC	Federal Energy Regulatory Commission
SEC	Securities and Exchange Commission

Other
ACE	Affordable Clean Energy
AMT	Alternative minimum tax
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
CERCLA	Comprehensive Environmental Response, Compensation, and Liability Act
CFO	Chief financial officer
CORE	CORE Electric Cooperative
CPCN	Certificate of Public Convenience and Necessity
CSPV	Crystalline Silicon Photovoltaic
ETR	Effective Tax Rate
GAAP	United States generally accepted accounting principles
GCA	Gas cost adjustment
IPP	Independent power producing entity
IRA	Inflation Reduction Act
ITC	Investment tax credit
MGP	Manufactured gas plant
NOPR	Notice of proposed rulemaking
O&M	Operating and maintenance
PFAS	Per- and PolyFluoroAlkyl Substances
PIM	Performance incentive mechanism
PPA	Power purchase agreement
PTC	Production tax credit
ROE	Return on equity
UCA	Colorado Office of the Utility Consumer Advocate
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 tax rates, 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 impact on our results of operations, financial condition and cash flows of 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 in PSCo’s Annual Report on Form 10-K for the fiscal year ended Dec. 31, 2021 and subsequent filings with the SEC, 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, including potential workforce impacts resulting from vaccination requirements, quarantine policies or government restrictions, and sales volatility; 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; violations of our Codes of Conduct; ability to recover costs; changes in regulation; reductions in our credit ratings and the cost of maintaining certain contractual relationships; general economic conditions, including recessionary conditions, inflation rates, monetary fluctuations, supply chain constraints and their impact on capital expenditures and/or 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; regulatory changes and/or limitations related to the use of natural gas as an energy source; and our ability to execute on our strategies or achieve expectations related to environmental, social and governance matters, including as a result of evolving legal, regulatory and other standards, processes, and assumptions, the pace of scientific and technological developments, increased costs, the availability of requisite financing, and changes in carbon markets.

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 Sept. 30				Nine Months Ended Sept. 30
	2022		2021		2022		2021
Operating revenues
Electric	$	1,137	$	1,048	$	2,849	$	2,608
Natural gas	235		177		1,087		930
Other	11		12		39		34
Total operating revenues	1,383		1,237		3,975		3,572
Operating expenses
Electric fuel and purchased power	399		403		1,075		1,002
Cost of natural gas sold and transported	98		43		549		381
Cost of sales — other	4		5		13		11
O&M expenses	220		210		650		622
Demand side management expenses	32		34		97		98
Depreciation and amortization	219		189		627		557
Taxes (other than income taxes)	70		62		205		192
Total operating expenses	1,042		946		3,216		2,863
Operating income	341		291		759		709
Other (expense) income, net	(4)		—		(4)		3
Allowance for funds used during construction — equity	8		7		22		19
Interest charges and financing costs
Interest charges — includes other financing costs of $2, $2, $6 and $6, respectively	70		62		199		183
Allowance for funds used during construction — debt	(3)		(3)		(8)		(6)
Total interest charges and financing costs	67		59		191		177
Income before income taxes	278		239		586		554
Income tax expense	31		24		31		38
Net income	$	247	$	215	$	555	$	516

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 Sept. 30				Nine Months Ended Sept. 30
	2022		2021		2022		2021
Net income	$	247	$	215	$	555	$	516
Other comprehensive income
Derivative instruments:
Reclassification of loss to net income, net of tax of $—, $—, $— and $— respectively	1		—		1		1
Total other comprehensive income	1		—		1		1
Total comprehensive income	$	248	$	215	$	556	$	517

See Notes to Consolidated Financial Statements

5

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

(amounts in millions)

	Nine Months Ended Sept. 30
	2022		2021
Operating activities
Net income	$	555	$	516
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	631		560
Deferred income taxes	16		38
Allowance for equity funds used during construction	(22)		(19)
Provision for bad debts	22		28
Net realized and unrealized hedging and derivative transactions	(12)		(60)
Changes in operating assets and liabilities:
Accounts receivable	(77)		(38)
Accrued unbilled revenues	38		49
Inventories	(130)		(58)
Other current assets	(10)		2
Accounts payable	97		25
Net regulatory assets and liabilities	(43)		(544)
Other current liabilities	(58)		(49)
Pension and other employee benefit obligations	(14)		(53)
Other, net	(62)		18
Net cash provided by operating activities	931		415
Investing activities
Utility capital/construction expenditures	(1,384)		(1,098)
Investments in utility money pool arrangement	(45)		(273)
Repayments from utility money pool arrangement	45		243
Net cash used in investing activities	(1,384)		(1,128)
Financing activities
Repayments of short-term borrowings, net	(147)		(136)
Borrowings under utility money pool arrangement	1,042		514
Repayments under utility money pool arrangement	(877)		(571)
Proceeds from issuance of long-term debt	686		738
Repayments of long-term debt	(300)		—
Capital contributions from parent	399		567
Dividends paid to parent	(365)		(340)
Net cash provided by financing activities	438		772
Net change in cash, cash equivalents and restricted cash	(15)		59
Cash, cash equivalents and restricted cash at beginning of period	25		28
Cash, cash equivalents and restricted cash at end of period	$	10	$	87
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	$	(195)	$	(195)
Cash paid for income taxes, net	(70)		(14)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	$	144	$	170
Inventory transfers to property, plant and equipment	15		11
Operating lease right-of-use assets	16		4
Allowance for equity funds used during construction	22		19

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)

	Sept. 30, 2022		Dec. 31, 2021
Assets
Current assets
Cash and cash equivalents	$	10	$	25
Accounts receivable, net	430		374
Accounts receivable from affiliates	—		13
Accrued unbilled revenues	312		350
Inventories	359		245
Regulatory assets	504		353
Derivative instruments	48		39
Prepayments and other	124		104
Total current assets	1,787		1,503
Property, plant and equipment, net	19,309		18,444
Other assets
Regulatory assets	1,257		1,293
Derivative instruments	12		27
Operating lease right-of-use assets	358		409
Other	270		246
Total other assets	1,897		1,975
Total assets	$	22,993	$	21,922
Liabilities and Equity
Current liabilities
Current portion of long-term debt	$	250	$	300
Borrowings under utility money pool arrangement	165		—
Short-term debt	—		147
Accounts payable	611		531
Accounts payable to affiliates	87		69
Regulatory liabilities	68		95
Taxes accrued	186		252
Accrued interest	48		58
Dividends payable to parent	127		104
Derivative instruments	37		30
Operating lease liabilities	79		84
Other	119		109
Total current liabilities	1,777		1,779
Deferred credits and other liabilities
Deferred income taxes	2,010		1,960
Regulatory liabilities	2,484		2,397
Asset retirement obligations	448		422
Derivative instruments	7		29
Customer advances	150		160
Pension and employee benefit obligations	4		23
Operating lease liabilities	302		351
Other	204		190
Total deferred credits and other liabilities	5,609		5,532
Commitments and contingencies
Capitalization
Long-term debt	6,608		6,167
Common stock — 100 shares authorized of $0.01 par value; 100 shares outstanding at Sept. 30, 2022 and Dec. 31, 2021, respectively	—		—
Additional paid in capital	6,813		6,426
Retained earnings	2,207		2,040
Accumulated other comprehensive loss	(21)		(22)
Total common stockholder's equity	8,999		8,444
Total liabilities and equity	$	22,993	$	21,922

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 Sept. 30, 2022 and 2021
Balance at June 30, 2021	100	$	—	$	6,210	$	1,912	$	(23)	$	8,099
Net income						215				215
Dividends declared to parent						(127)				(127)
Contribution of capital by parent				123						123
Balance at Sept. 30, 2021	100	$	—	$	6,333	$	2,000	$	(23)	$	8,310
Balance at June 30, 2022	100	$	—	$	6,623	$	2,087	$	(22)	$	8,688
Net income						247				247
Other comprehensive income								1		1
Dividends declared to parent						(127)				(127)
Contribution of capital by parent				190						190
Balance at Sept. 30, 2022	100	$	—	$	6,813	$	2,207	$	(21)	$	8,999
	Common Stock Issued					Retained Earnings		Accumulated Other Comprehensive Loss		Total Common Stockholder's Equity
	Shares	Par Value		Additional Paid In Capital
Nine Months Ended Sept. 30, 2022 and 2021
Balance at Dec. 31, 2020	100	$	—	$	5,770	$	1,846	$	(24)	$	7,592
Net income						516				516
Other comprehensive income								1		1
Dividends declared to parent						(362)				(362)
Contribution of capital by parent				563						563
Balance at Sept. 30, 2021	100	$	—	$	6,333	$	2,000	$	(23)	$	8,310
Balance at Dec. 31, 2021	100	$	—	$	6,426	$	2,040	$	(22)	$	8,444
Net income						555				555
Other comprehensive income								1		1
Dividends declared to parent						(388)				(388)
Contribution of capital by parent				387						387
Balance at Sept. 30, 2022	100	$	—	$	6,813	$	2,207	$	(21)	$	8,999

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 Sept. 30, 2022 and Dec. 31, 2021; the results of PSCo’s operations, including the components of net income, comprehensive income and changes in stockholder’s equity for the three and nine months ended Sept. 30, 2022 and 2021; and PSCo’s cash flows for the nine months ended Sept. 30, 2022 and 2021.

All adjustments are of a normal, recurring nature, except as otherwise disclosed. Management has also evaluated the impact of events occurring after Sept. 30, 2022, 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, 2021 balance sheet information has been derived from the audited 2021 consolidated financial statements included in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2021.

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, 2021, filed with the SEC on Feb. 23, 2022. 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, 2021 appropriately represent, in all material respects, the current status of accounting policies and are incorporated herein by reference.

2. Accounting Pronouncements

As of Sept. 30, 2022, there was no material impact from the recent adoption of new accounting pronouncements, nor expected material impact from recently issued accounting pronouncements yet to be adopted, on PSCO’s consolidated financial statements.

3. Selected Balance Sheet Data

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$	478	$	414
Less allowance for bad debts	(48)		(40)
Accounts receivable, net	$	430	$	374

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	77	$	70
Fuel	85		71
Natural gas	197		104
Total inventories	$	359	$	245

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	15,468	$	16,543
Natural gas plant	5,760		5,471
Common and other property	1,341		1,224
Plant to be retired (a)	1,326		182
Construction work in progress	956		681
Total property, plant and equipment	24,851		24,101
Less accumulated depreciation	(5,542)		(5,657)
Property, plant and equipment, net	$	19,309	$	18,444

(a)Amounts as of Dec. 31, 2021 include Comanche Unit 1 and 2 and Craig Units 1 and 2. Following the June 2022 approval of PSCo’s revised resource plan settlement, amounts as of Sept. 30, 2022 include the addition of Comanche Unit 3, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion. Amounts are reported net of accumulated depreciation.

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 Sept. 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	250		$	250
Amount outstanding at period end	165			—
Average amount outstanding	49			12
Maximum amount outstanding	197			243
Weighted average interest rate, computed on a daily basis	2.06		%	0.07		%
Weighted average interest rate at period end	2.33			N/A

Commercial Paper — Commercial paper outstanding for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	700		$	700
Amount outstanding at period end	—			147
Average amount outstanding	14			26
Maximum amount outstanding	170			322
Weighted average interest rate, computed on a daily basis	2.07		%	0.19		%
Weighted average interest rate at period end	N/A			0.22

Letters of Credit — PSCo uses letters of credit, generally with terms of one year, to provide financial guarantees for certain obligations. At Sept. 30, 2022 and Dec. 31, 2021, there were $26 million and $8 million of letters of credit outstanding under the credit facility, respectively. Amounts approximate their fair value and are subject to fees.

9

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.

In September 2022, PSCo entered into an amended five-year credit agreement with a syndicate of banks, with substantially the same terms and conditions as the prior credit agreements. The maturity was extended from June 2024 to September 2027.

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 Sept. 30, 2022, PSCo had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	700	$	26	$	674

(a)    Expires in September 2027.

(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 Sept. 30, 2022 and Dec. 31, 2021.

Long-Term Borrowings

During the nine months ended Sept. 30, 2022, PSCo issued $300 million of 4.10% first mortgage bonds due June 1, 2032 and $400 million of 4.50% first mortgage bonds due June 1, 2052.

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 Sept. 30, 2022
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	431	$	136	$	4	$	571
C&I	556		64		7		627
Other	13		—		—		13
Total retail	1,000		200		11		1,211
Wholesale	63		—		—		63
Transmission	25		—		—		25
Other	15		30		—		45
Total revenue from contracts with customers	1,103		230		11		1,344
Alternative revenue and other	34		5		—		39
Total revenues	$	1,137	$	235	$	11	$	1,383

	Three Months Ended Sept. 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	386	$	97	$	3	$	486
C&I	510		38		7		555
Other	12		—		—		12
Total retail	908		135		10		1,053
Wholesale	60		—		—		60
Transmission	23		—		—		23
Other	15		38		—		53
Total revenue from contracts with customers	1,006		173		10		1,189
Alternative revenue and other	42		4		2		48
Total revenues	$	1,048	$	177	$	12	$	1,237
	Nine Months Ended Sept. 30, 2022
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,025	$	686	$	11	$	1,722
C&I	1,383		279		16		1,678
Other	38		—		—		38
Total retail	2,446		965		27		3,438
Wholesale	200		—		—		200
Transmission	65		—		—		65
Other	39		106		—		145
Total revenue from contracts with customers	2,750		1,071		27		3,848
Alternative revenue and other	99		16		12		127
Total revenues	$	2,849	$	1,087	$	39	$	3,975
	Nine Months Ended Sept. 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	904	$	540	$	9	$	1,453
C&I	1,262		203		22		1,487
Other	37		—		—		37
Total retail	2,203		743		31		2,977
Wholesale	195		—		—		195
Transmission	59		—		—		59
Other	37		122		—		159
Total revenue from contracts with customers	2,494		865		31		3,390
Alternative revenue and other	114		65		3		182
Total revenues	$	2,608	$	930	$	34	$	3,572

10

6. Income Taxes

Reconciliation between the statutory rate and ETR:

	Nine Months Ended Sept. 30
	2022		2021
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	3.6		3.6
Increases (decreases):
Wind PTCs (a)	(14.2)		(12.9)
Plant regulatory differences (b)	(4.4)		(4.1)
Other tax credits, net operating loss & tax credit allowances	(1.1)		(0.7)
Other (net)	0.4		—
Effective income tax rate	5.3	%	6.9	%

(a)Wind PTCs are credited to customers (reduction to revenue) and do not materially impact net income.

(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 taxes are offset by corresponding revenue reductions.

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 NAV.

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

Commodity derivatives — Methods used to measure the fair value of commodity derivative forwards and options utilize forward prices and volatilities, as well as pricing adjustments for specific delivery locations and are generally assigned a Level 2 classification. When contractual settlements relate to inactive delivery locations or extend to periods beyond those readily observable on active exchanges or quoted by brokers, the significance of the use of less observable 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 Sept. 30, 2022, accumulated other comprehensive loss related to 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. As of Sept. 30, 2022, PSCo had no unsettled interest rate derivatives.

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 may enter into derivative instruments that mitigate commodity price risk on behalf of electric and natural gas customers but may not be designated as qualifying hedging transactions. The classification of gains or losses for these instruments as a regulatory asset or liability, if applicable, is based on approved regulatory recovery mechanisms.

As of Sept. 30, 2022, PSCo had no commodity contracts designated as cash flow hedges.

PSCo also 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)	Sept. 30, 2022	Dec. 31, 2021
Megawatt hours of electricity	10	15
Million British thermal units of natural gas	52	71

(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.

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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 Sept. 30, 2022, four of PSCo’s ten most significant counterparties for these activities, comprising $53 million, or 45%, 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 $26 million, or 22%, 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. Two of these significant counterparties, comprising $16 million, or 13%, of this credit exposure, had credit quality less than investment grade, based on internal analysis. Six of these significant counterparties are independent system operators, municipal or cooperative electric entities, Regional Transmission Organizations or other utilities.

Impact of Derivative Activity —

Changes in the fair value of natural gas commodity derivatives resulted in net losses of $4 million and $2 million for the three and nine months ended Sept. 30, 2022, respectively, which were recognized as regulatory assets and liabilities. Changes in the fair value of natural gas commodity derivatives resulted in net gains of $37 million and $36 million for the three and nine months ended Sept. 30, 2021, respectively. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms.

	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 Sept. 30, 2022
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	2	(b)
Total	$	—		$	—		$	2
Nine Months Ended Sept. 30, 2022
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	3	(b)
Natural gas commodity	—			2		(c)	(11)		(c)(d)
Total	$	—		$	2		$	(8)
Three Months Ended Sept. 30, 2021
Other derivative instruments
Commodity trading	$	—		$	—		$	11	(b)
Total	$	—		$	—		$	11
Nine Months Ended Sept. 30, 2021
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	25	(b)
Natural gas commodity	—			6		(c)	(6)		(c)(d)
Total	$	—		$	6		$	19

(a)    Recorded to interest charges.

(b)    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)    Recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

(d)    Relates primarily to option premium amortization.

PSCo had no derivative instruments designated as fair value hedges during the three and nine months ended Sept. 30, 2022 and 2021.

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 Sept. 30, 2022 and Dec. 31, 2021, 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 Sept. 30, 2022 and Dec. 31, 2021, there were approximately $2 million and $16 million, respectively, of derivative liabilities with such underlying contract provisions.

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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 Sept. 30, 2022 and Dec. 31, 2021.

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

	Sept. 30, 2022												Dec. 31, 2021
	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	$	28	$	116	$	—	$	144	$	(114)	$	30	$	12	$	97	$	—	$	109	$	(81)	$	28
Natural gas commodity	—		18		—		18		—		18		—		11		—		11		—		11
Total current derivative assets	$	28	$	134	$	—	$	162	$	(114)	$	48	$	12	$	108	$	—	$	120	$	(81)	$	39
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	20	$	22	$	16	$	58	$	(46)	$	12	$	10	$	28	$	54	$	92	$	(65)	$	27
Total noncurrent derivative assets	$	20	$	22	$	16	$	58	$	(46)	$	12	$	10	$	28	$	54	$	92	$	(65)	$	27

	Sept. 30, 2022												Dec. 31, 2021
	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	$	12	$	123	$	14	$	149	$	(120)	$	29	$	6	$	90	$	16	$	112	$	(85)	$	27
Natural gas commodity	—		8		—		8		—		8		—		3		—		3		—		3
Total current derivative liabilities	$	12	$	131	$	14	$	157	$	(120)	$	37	$	6	$	93	$	16	$	115	$	(85)	$	30
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	9	$	25	$	26	$	60	$	(53)	$	7	$	3	$	—	$	101	$	104	$	(75)	$	29
Total noncurrent derivative assets	$	9	$	25	$	26	$	60	$	(53)	$	7	$	3	$	—	$	101	$	104	$	(75)	$	29

(a)PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At both Sept. 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include no obligations to return cash collateral. At Sept. 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include rights to reclaim cash collateral of $13 million and $14 million, respectively. 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 Sept. 30
(Millions of Dollars)	2022		2021
Balance at July 1	$	(30)	$	(61)
Settlements	5		4
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	1		(11)
Balance at Sept. 30	$	(24)	$	(68)
	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Balance at Jan. 1	$	(63)	$	(44)
Settlements	9		3
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	30		(27)
Balance at Sept. 30	$	(24)	$	(68)

(a)Level 3 net gains recognized in earnings are subject to offsetting net losses of derivative instruments categorized as levels 1 and 2 in the income statement.

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 nine months ended Sept. 30, 2022 and 2021.

Fair Value of Long-Term Debt

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

	Sept. 30, 2022				Dec. 31, 2021
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	6,858	$	5,785	$	6,467	$	7,291

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 Sept. 30, 2022 and Dec. 31, 2021 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 Sept. 30
	2022		2021		2022		2021
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	7	$	8	$	1	$	—
Interest cost (a)	10		9		2		2
Expected return on plan assets (a)	(19)		(18)		(4)		(4)
Amortization of prior service credit (a)	—		—		(1)		(1)
Amortization of net loss (a)	6		9		—		1
Settlement charge (b)	2		—		—		—
Net periodic benefit cost (credit)	6		8		(2)		(2)
Effects of regulation	(2)		(2)		1		1
Net benefit cost (credit) recognized for financial reporting	$	4	$	6	$	(1)	$	(1)
	Nine Months Ended Sept. 30
	2022		2021		2022		2021
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	22	$	24	$	1	$	—
Interest cost (a)	31		29		8		8
Expected return on plan assets (a)	(58)		(54)		(12)		(12)
Amortization of prior service credit (a)	—		—		(2)		(3)
Amortization of net loss (a)	17		24		1		3
Settlement charge (b)	2		—		—		—
Net periodic benefit cost (credit)	14		23		(4)		(4)
Effects of regulation	3		—		2		2
Net benefit cost (credit) recognized for financial reporting	$	17	$	23	$	(2)	$	(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.

(b)A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In the third quarter of 2022 as a result of lump-sum distributions during the 2022 plan year, PSCO recorded a pension settlement charge of $2 million, the majority of which was not recognized due to the effects of regulation.

In January 2022, contributions of $50 million were made across four of Xcel Energy’s pension plans, of which $40 million was attributable to PSCo. Xcel Energy does not expect additional pension contributions during 2022.

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.

Comanche Unit 3 Litigation — In September 2021, CORE filed a lawsuit in Denver County District Court. CORE alleges PSCo breached ownership agreement terms by failing to operate Comanche Unit 3 in accordance with prudent utility practices. In January 2022, the Court granted PSCo’s motion and dismissed CORE’s claims for unjust enrichment, declaratory judgment and damages for replacement power costs. In February 2022, CORE disclosed that it is claiming in excess of $125 million in total damages.

In April 2022, CORE filed a supplement to include the January 2022 outage. It claims additional undisclosed damages arising from this event. PSCo continues to believe CORE’s claims are without merit.

Rate Matters

PSCo is involved in various regulatory proceedings arising in the ordinary course of business. Until resolution, typically in the form of a rate order, uncertainties may exist regarding the ultimate rate treatment for certain activities and transactions. Amounts have been recognized for probable and reasonably estimable losses that may result. Unless otherwise disclosed, any reasonably possible range of loss in excess of any recognized amount is not expected to have a material effect on the financial statements.

Environmental

MGP, Landfill and Disposal Sites

PSCo is investigating, remediating or performing post-closure actions at two 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 are 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 applicable landfills and surface impoundments as well as perform corrective actions where offsite groundwater has been impacted.

As of Sept. 30, 2022, PSCo has five regulated ash units in operation with two sites being evaluated for corrective actions.

PSCo is currently exploring an agreement with a third party that would excavate and process ash for beneficial use (at two sites) at a cost of approximately $43 million. An estimated liability has been recorded for this amount. PSCo anticipates these costs will be fully recoverable through regulatory mechanisms.

Investigation and feasibility studies for additional corrective action related to offsite groundwater are ongoing (at two sites). While the results are uncertain, additional costs are estimated to be up to $35 million. An estimated liability has been recorded for the portion of these actions that are estimable, and are expected to be fully recoverable through regulatory mechanisms.

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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 Sept. 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	22	$	26
Other operating leases (a)	3		2
Total operating lease expense (b)	$	25	$	28
Finance leases
Amortization of ROU assets	$	1	$	2
Interest expense on lease liability	4		4
Total finance lease expense	$	5	$	6

(a)Includes immaterial short-term lease expense for 2022 and 2021.

(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.

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	70	$	77
Other operating leases (a)	13		9
Total operating lease expense (b)	$	83	$	86
Finance leases
Amortization of ROU assets	$	3	$	6
Interest expense on lease liability	12		12
Total finance lease expense	$	15	$	18

(a)Includes short-term lease expense of $1 million for 2022 and 2021, 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 Sept. 30, 2022:

(Millions of Dollars)	PPA Operating Leases		Other Operating Lease		Total Operating Leases		Finance Leases
Total minimum obligation	$	388	$	44	$	432	$	454
Interest component of obligation	(46)		(5)		(51)		(332)
Present value of minimum obligation	$	342	$	39	381		122
Less current portion					(79)		(5)
Noncurrent operating and finance lease liabilities					$	302	$	117

Variable Interest Entities 

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 they purchase. These specific PPAs create a variable interest in the IPP.

PSCo had approximately 1,442 MW and 1518 MW of capacity under long-term PPAs at Sept. 30, 2022 and Dec. 31, 2021 with entities that have been determined to be variable interest entities. 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 nine months ended Sept. 30, 2022 and 2021:

	Three Months Ended Sept. 30, 2022						Three Months Ended Sept. 30, 2021
(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 July 1	$	(21)	$	(1)	$	(22)	$	(22)	$	(1)	$	(23)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	1		—		1		—		—		—
Net current period other comprehensive income	1		—		1		—		—		—
Accumulated other comprehensive loss at Sept. 30	$	(20)	$	(1)	$	(21)	$	(22)	$	(1)	$	(23)

	Nine Months Ended Sept. 30, 2022						Nine Months Ended Sept. 30, 2021
(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	$	(21)	$	(1)	$	(22)	$	(23)	$	(1)	$	(24)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	1		—		1		1		—		1
Net current period other comprehensive income	1		—		1		1		—		1
Accumulated other comprehensive loss at Sept. 30	$	(20)	$	(1)	$	(21)	$	(22)	$	(1)	$	(23)

(a) Included in interest charges.

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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. The regulated electric utility segment 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.

Certain costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators across each segment. In addition, a general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

PSCo’s segment information:

	Three Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues	$	1,137	$	1,048
Net income	243		212
Regulated Natural Gas
Total revenues	$	235	$	177
Net income	4		8
All Other
Total revenues (a)	$	11	$	12
Net loss	—		(5)
Consolidated Total
Total revenues (a)	$	1,383	$	1,237
Net income	247		215

(a)    Total revenues include $2 million and $1 million of other affiliate revenue for the three months ended Sept. 30, 2022 and 2021.

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Regulated Electric
Operating revenues — external	$	2,849	$	2,608
Intersegment revenue	—		1
Total revenues	2,849		2,609
Net income	455		400
Regulated Natural Gas
Total revenues	$	1,087	$	930
Net income	99		121
All Other
Total revenues (a)	$	39	$	34
Net income (loss)	1		(5)
Consolidated Total
Total revenues (a)	$	3,975	$	3,573
Reconciling eliminations	—		(1)
Total operating revenues	$	3,975	$	3,572
Net income	555		516

(a)    Total revenues include $4 million and $3 million of other affiliate revenue for the nine months ended Sept. 30, 2022 and 2021.

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 ongoing earnings. 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.

Earnings Adjusted for Certain Items (Ongoing Earnings)

Ongoing earnings reflect adjustments to GAAP earnings (net income) for certain items.

We use this non-GAAP financial measure to evaluate and provide details of PSCo’s core earnings and underlying performance. We believe this measurement is useful to investors to evaluate the actual and projected financial performance and contribution of PSCo. For the three and nine months ended Sept. 30, 2022 and 2021, there were no such adjustments to GAAP earnings and therefore GAAP earnings equal ongoing earnings.

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Results of Operations

PSCo’s net income was $555 million for the nine months ended Sept. 30, 2022, compared to $516 million for the prior year. The increase reflects regulatory rate outcomes, partially offset by increased depreciation and O&M expenses.

Electric Margin

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

Electric revenues and fuel and purchased power expenses are impacted by fluctuations in the price of natural gas and coal. However, these fluctuations have minimal impact on margin due to fuel recovery mechanisms. In addition, electric customers receive a credit for PTCs generated, which reduce electric revenue and margin (offset by lower tax expense).

Electric revenues, fuel and purchased power and electric margin and explanation of the changes are listed as follows:

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Electric revenues	$	2,849	$	2,608
Electric fuel and purchased power	(1,075)		(1,002)
Electric margin	$	1,774	$	1,606

(Millions of Dollars)	Nine Months Ended Sept. 30, 2022 vs. 2021
Regulatory rate outcomes	$	110
Sales and demand (a)	39
Non-fuel riders	18
Proprietary commodity trading, net of sharing (b)	(13)
Other, net	14
Total increase	$	168

(a)Sales excludes weather impact, net of decoupling.

(b)Includes $11 million of trading margin recognized in the first quarter of 2021, driven by market changes associated with Winter Storm Uri.

Natural Gas Margin

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

Natural gas revenues, cost of natural gas sold and transported and natural gas margin and explanation of the changes are listed as follows:

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Natural gas revenues	$	1,087	$	930
Cost of natural gas sold and transported	(549)		(381)
Natural gas margin	$	538	$	549

(Millions of Dollars)	Nine Months Ended Sept. 30, 2022 vs. 2021
Infrastructure and integrity riders	$	2
Regulatory rate outcomes (a)	(10)
Winter Storm Uri disallowance	(4)
Other, net	1
Total decrease	$	(11)

(a)Impact is due to a favorable regulatory rate outcome recognized in the second quarter of 2021.

Non-Fuel Operating Expenses and Other Items

O&M Expenses — O&M costs increased $28 million year-to-date. The increase is due to additional investments in technology and customer programs, higher regulatory fees, increased costs for vegetation management and inflation, offset by a reduction in employee benefit costs.

Depreciation and Amortization — Depreciation and amortization expense increased $70 million year-to-date. The increase was primarily due to normal system expansion and new electric and natural gas depreciation rates.

Interest Charges — Interest charges increased $16 million year-to-date, largely due to higher interest rates and increased long-term debt levels to fund capital investments.

Income Taxes — Income tax expense decreased $7 million year-to-date. The decrease was primarily driven by an increase in wind PTCs due to greater production. 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.

See Note 6 to the consolidated financial statements.

Public Utility Regulation and Other

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 cases and implementation of final rates. Other factors affecting rate filings are new investments, sales, conservation and demand side management efforts, and the cost of capital.

In addition, the regulatory commissions authorize the ROE, capital structure and depreciation rates in rate proceedings. Decisions by these regulators can significantly impact 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, 2021, appropriately represent, in all material respects, the current status of public utility regulation and are incorporated herein by reference.

17

Pending and Recently Concluded Regulatory Proceedings

Colorado Natural Gas Rate Case — In January 2022, PSCo filed a request with the CPUC seeking a net increase to retail natural gas rates of $107 million. The total change to base rates is $215 million, which reflects the transfer of $108 million previously recovered from customers through the pipeline system integrity adjustment rider. The request is based on a 10.25% ROE, an equity ratio of 55.66% and a 2022 current test year with a projected rate base of $3.6 billion. PSCo has requested a proposed effective date of Nov. 1, 2022.

Additionally, PSCo’s request includes step revenue increases of $40 million (effective Nov. 1, 2023) and $41 million (effective Nov. 1, 2024) related to continued capital investment.

In October 2022, the CPUC issued a written decision approving a rate increase net of rider roll-ins of $64 million. The decision reflects a stated WACC of 6.7%, a historic test year with a year-end rate base and $16 million of incremental depreciation expense. PSCo has the option to determine its ROE within a range of 9.2% to 9.5% and its equity ratio within a range of 52% to 55%, as long as it results in a WACC of 6.7%. PSCo anticipates using a ROE of 9.2% and an equity ratio of 53.8%. The CPUC denied the 2023-2024 step increases.

Power Pathway Settlement — In June 2022, the CPUC issued a final written order issuing the CPCN for the Pathway Project. Key decisions include:

•The CPUC approved PSCo’s cost estimate of $1.7 billion and recovery through the transmission rider.

•The CPUC modified the PIMs proposed in the settlement agreement, which focused on cost controls, to add a separate mechanism to further incentivize timely delivery of the Pathway Project segments. The CPUC also increased the magnitude of the PIMs.

•The CPUC granted conditional approval for the 345 kilovolt May Valley-Longhorn line extension, pending the level of renewables being added in that region through PSCo’s resource plan. The initial cost estimate for the extension is approximately $250 million.

Resource Plan Settlement — In August 2022, the CPUC issued a written approval of a revised settlement, which will result in the further acceleration of the retirement of the Comanche Unit 3 coal plant, an expected carbon reduction of at least 85% and an 80% renewable mix by 2030. The CPUC deferred a decision on the method of cost recovery for the retiring coal units to a separate docket, which will consider accelerated depreciation, creation of regulatory assets and securitization. PSCo expects to commence the request for proposal process for generation resources and file a recovery method docket in the fourth quarter of 2022.

Key settlement terms include:

•Early retirement of Hayden: Unit 2 in 2027 (was 2036); and Unit 1 in 2028 (was 2030).

•Conversion of the Pawnee coal plant to natural gas by no later than Jan. 1, 2026.

•Early retirement of Comanche Unit 3 by Jan. 1, 2031 (was 2070) with reduced operations beginning in 2025.

•Addition of ~2,400 MW of wind.

•Addition of ~1,600 MW of universal-scale solar.

•Addition of 400 MW of storage.

•Addition of 1,300 MW of flexible, dispatchable generation.

•Addition of ~1,200 MW of distributed solar resources through our renewable energy programs.

Partial Settlement — In October 2021, PSCo filed a comprehensive settlement with the CPUC Staff and the Colorado Energy Office, which proposed to address four outstanding regulatory items, including recovery of fuel costs related to Winter Storm Uri, disputed revenue associated with the 2020 electric decoupling pilot program year, replacement power costs associated with an extended outage at Comanche Unit 3 during 2020 and deferred customer bad debt balances associated with COVID-19. In July 2022, the CPUC approved the settlement, with an $8 million disallowance relating to the Winter Storm Uri fuel costs.

Decoupling Filing — PSCo has 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 October 2021, a settlement was reached on Winter Storm Uri costs and also addressed certain components of decoupling. See Partial Settlement disclosure above.

As of Sept. 30, 2022, PSCo has recognized a refund for Residential customers and a surcharge for small C&I customers based on 2020, 2021 and the first, second and third quarters of 2022 results.

In April 2022, PSCo made its annual filing. In May 2022, the UCA filed a protest raising issues relating to the Winter Storm Uri settlement and the soft cap components of the decoupling program. On May 25, 2022 the CPUC found merit in UCA’s protest, suspended PSCo’s advice letter and referred the matter to the ALJ. A hearing is expected to take place in the fourth quarter of 2022 and an ALJ recommendation is expected in the first quarter of 2023.

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, and other items. In January 2022, the court issued its decision that the CPUC’s approach to gains and losses on certain sales of assets was legally erroneous and confiscatory to PSCo and set aside and remanded the issue for further consideration. In October 2022, the CPUC approved PSCo’s proposed methodology to allocate gains and losses.

GCA NOPR — In June 2021, the CPUC issued a NOPR addressing the recovery of costs through the GCA. The CPUC has reopened the GCA NOPR matter and proposed a 2 step process aimed at 1) considering near term process changes to the GCA used by various utilities and 2) a longer term process to evaluate potential performance incentive GCA structures to be filed by Nov. 1, 2022. In step 1, consensus proposed rule amendments to update the process and filing requirements for GCA and related filings have been submitted to the CPUC for consideration.

Natural Gas Planning NOPR — In October 2021, the CPUC issued a NOPR to implement recent state legislation requiring natural gas utilities to develop clean heat plans as a means to meet state greenhouse gas emission reduction targets, as well as updated demand-side management criteria. Additionally, the proposed rules included new comprehensive natural gas infrastructure planning requirements and related CPCN application procedures, changes in natural gas line extension policy, and details on emission accounting related to clean heat plans. The CPUC staff will provide proposed rules in the fourth quarter of 2022.

18

Other

Supply Chain

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. Manufacturing processes have experienced disruptions related to scarcity of certain raw materials and interruptions in production and shipping. For example, availability of certain types of transformers has been significantly impacted and in some cases may result in delays in new customer connections as we work to address the shortage. These disruptions have been further exacerbated by inflationary pressures, labor shortages and the impact of international conflicts/issues. PSCo continues to monitor the situation as it remains fluid and seeks to mitigate the impacts by securing alternative suppliers, modifying design standards, and adjusting the timing of work.

Advanced Metering Infrastructure Implementation

Supply chain issues associated with semi-conductors have delayed the availability of advanced infrastructure electric meters, which has led to a reduced number of meters deployed in 2022. Impacts to the 2023 deployment schedule are currently being evaluated.

Solar Resources

In April 2022, the U.S. Department of Commerce initiated an anti-circumvention investigation that would subject CSPV solar panels and cells imported from Malaysia, Vietnam, Thailand, and Cambodia with potential incremental tariffs ranging from 50% to 250%. These countries account for more than 80% of CSPV panel imports.

Since that time, an interim stay on tariffs has been issued and many significant solar projects have resumed with modified costs and projected in-service dates, including certain PPAs in PSCo which are pending regulatory approval.

Marshall Wildfire

In December 2021, a wildfire ignited in Boulder County, Colorado (the “Marshall Fire”), which burned over 6,000 acres and destroyed or damaged over 1,000 structures. Boulder County authorities are currently investigating the fire and have not yet determined a cause. There were no downed power lines in the ignition area, and nothing the Company has seen to this point indicates that our equipment or operations caused the fire.

In Colorado, the standard of review governing liability differs from the “inverse condemnation” or strict liability standard utilized in California. In Colorado, courts look to whether electric power companies have operated their system with a heightened duty of care consistent with the practical conduct of its business, and liability does not extend to occurrences that cannot be reasonably anticipated. In addition, PSCo has been operating under a commission approved wildfire mitigation plan and carries wildfire liability insurance.

In March 2022, a class action suit was filed in Boulder County pertaining to the Marshall Fire. In the remote event PSCo was found liable related to this litigation and were required to pay damages, such amounts could exceed our insurance coverage and have a material adverse effect on our financial condition, results of operations or cash flows. In June 2022, Plaintiffs served the class action lawsuit. In July 2022, PSCo filed a Motion to Dismiss.

Comanche Unit 3 Outage

In late January 2022, PSCo experienced an outage at the Comanche Unit 3 coal plant. The plant returned to service in June 2022. PSCo will not seek recovery of the $10 million of incremental replacement power costs incurred during the outage, which reflects a true-up to final incurred costs in the third quarter of 2022.

Inflation Reduction Act — In August 2022, the IRA was signed into law.

Key provisions impacting PSCo include:

•Extends current PTC and ITC for renewable technologies (e.g., wind and solar).

•Restores full value of the PTC and ITC for qualifying facilities placed in-service after 2021.

•Creates a PTC for solar, clean hydrogen and nuclear.

•Establishes an ITC for energy storage, microgrids, interconnection facilities, etc.

•Allows companies to monetize or sell credits to unrelated parties.

PSCo anticipates the IRA will drive significant customer savings for both new and existing Company owned renewable projects, assuming appropriate regulatory mechanisms and development of a market for the sale of tax credits. The IRA is expected to allow PSCo to monetize tax credits more efficiently with the incremental benefits passed through to customers.

In addition, the IRA created a new corporate AMT. PSCo does not anticipate AMT having a material cash impact based on current estimates and our interpretation of AMT application.

Winter Storm Uri

In February 2021, the United States experienced Winter Storm Uri. Extreme cold temperatures impacted certain operational assets as well as the availability of renewable generation. 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 May 2021, PSCo filed a request with the CPUC to recover $263 million in weather-related electric costs, $287 million in incremental natural gas costs and $4 million in incremental steam costs over 24 months with no financing charge.

In May 2022, an ALJ recommended full recovery of all costs with no cost disallowances. In July 2022, the CPUC approved a partial settlement providing full recovery of fuel costs with the exception of an $8 million disallowance.

Environmental

CERCLA

PFAS are man-made chemicals that are widely used in consumer products and can persist and bio-accumulate in the environment. PSCo does not manufacture PFAS but because PFAS are so ubiquitous in products and the environment, it may impact our operations. In September 2022, the EPA proposed to designate two types of PFAS as “hazardous substances” under the CERCLA, specifically perfluorooctanoic acid and perfluorooctanesulfonic acid. This proposed rule could result in new obligations for investigation and cleanup wherever PFAS are found to be present. The impact the proposed regulation may have on electric and gas utilities is currently uncertain.

19

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 Sept. 30, 2022, 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, 2021, which is incorporated herein by reference. There have been no material changes from the risk factors previously disclosed in the Form 10-K.

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
10.01*	Fourth Amended and Restated Credit Agreement, dated as of September 19, 2022, among Public Service Company of Colorado, as Borrower, the several lenders from time to time parties thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, Bank of America, N.A. and Barclays Bank PLC, as Syndication Agents, and Citibank, N.A., MUFG Bank, Ltd. and Wells Fargo Bank, National Association, as Documentation Agents	Xcel Energy Inc. Form 8-K dated September 19, 2022	99.03
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)

20

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
10/27/2022	By:	/s/ BRIAN J. VAN ABEL
		Brian J. Van Abel
		Executive Vice President, Chief Financial Officer
		(Duly Authorized Officer and Principal Financial Officer)

21

EX-31.01

Exhibit 31.01

CERTIFICATION

I, Robert C. Frenzel, 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: 10/27/2022

/s/ ROBERT C. FRENZEL

Robert C. Frenzel

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: 10/27/2022

/s/ BRIAN J. VAN ABEL

Brian J. Van Abel

Executive Vice President, Chief Financial Officer and Director

(Duly Authorized Officer and 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 Sept. 30, 2022, 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: 10/27/2022

/s/ ROBERT C. FRENZEL

Robert C. Frenzel

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

(Duly Authorized Officer and 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

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Cover Page - shares	9 Months Ended
	Sep. 30, 2022	Oct. 27, 2022
Cover [Abstract]
Entity Registrant Name	PUBLIC SERVICE CO OF COLORADO
Entity Central Index Key	0000081018
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Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
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Document Type	10-Q
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Entity File Number	001-03280
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
Entity Address, Postal Zip Code	80202
City Area Code	(303)
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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating revenues
Electric	$ 1,137	$ 1,048	$ 2,849	$ 2,608
Natural gas	235	177	1,087	930
Other	11	12	39	34
Total operating revenues	1,383	1,237	3,975	3,572
Operating expenses
Electric fuel and purchased power	399	403	1,075	1,002
Cost of natural gas sold and transported	98	43	549	381
Cost of sales — other	4	5	13	11
O&M expenses	220	210	650	622
Demand side management expenses	32	34	97	98
Depreciation and amortization	219	189	627	557
Taxes (other than income taxes)	70	62	205	192
Total operating expenses	1,042	946	3,216	2,863
Operating income	341	291	759	709
Other (expense) income, net	(4)	0	(4)	3
Allowance for funds used during construction — equity	8	7	22	19
Interest charges and financing costs
Interest charges — includes other financing costs of $2, $2, $6 and $6, respectively	70	62	199	183
Allowance for funds used during construction — debt	(3)	(3)	(8)	(6)
Total interest charges and financing costs	67	59	191	177
Income before income taxes	278	239	586	554
Income tax expense	31	24	31	38
Net income	$ 247	$ 215	$ 555	$ 516

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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
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Statement of Financial Position [Abstract]
Other financing costs	$ 2	$ 2	$ 6	$ 6

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
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Comprehensive income:
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Derivative instruments:
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Total other comprehensive income	1	0	1	1
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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
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Statement of Comprehensive Income [Abstract]
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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
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Operating activities
Net income	$ 555	$ 516
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	631	560
Deferred income taxes	16	38
Allowance for equity funds used during construction	(22)	(19)
Provision for bad debts	22	28
Net realized and unrealized hedging and derivative transactions	(12)	(60)
Changes in operating assets and liabilities:
Accounts receivable	(77)	(38)
Accrued unbilled revenues	38	49
Inventories	(130)	(58)
Other current assets	(10)	2
Accounts payable	97	25
Net regulatory assets and liabilities	(43)	(544)
Other current liabilities	(58)	(49)
Pension and other employee benefit obligations	(14)	(53)
Other, net	(62)	18
Net cash provided by operating activities	931	415
Investing activities
Utility capital/construction expenditures	(1,384)	(1,098)
Investments in utility money pool arrangement	(45)	(273)
Repayments from utility money pool arrangement	45	243
Net cash used in investing activities	(1,384)	(1,128)
Financing activities
Repayments of short-term borrowings, net	(147)	(136)
Borrowings under utility money pool arrangement	1,042	514
Repayments under utility money pool arrangement	(877)	(571)
Proceeds from issuance of long-term debt	(686)	(738)
Repayments of long-term debt	(300)	0
Capital contributions from parent	399	567
Dividends paid to parent	(365)	(340)
Net cash provided by financing activities	438	772
Net change in cash, cash equivalents and restricted cash	(15)	59
Cash, cash equivalents and restricted cash at beginning of period	25	28
Cash, cash equivalents and restricted cash at end of period	10	87
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(195)	(195)
Cash paid for income taxes, net	(70)	(14)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	144	170
Inventory transfers to property, plant and equipment	15	11
Operating lease right-of-use assets	16	4
Allowance for equity funds used during construction	$ 22	$ 19

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CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Current assets
Cash, cash equivalents and restricted cash at beginning of period	$ 10	$ 25
Accounts receivable, net	430	374
Accounts receivable from affiliates	0	13
Accrued unbilled revenues	312	350
Inventories	359	245
Regulatory assets	504	353
Derivative instruments	48	39
Prepayments and other	124	104
Total current assets	1,787	1,503
Property, plant and equipment, net	19,309	18,444
Other assets
Regulatory assets	1,257	1,293
Derivative instruments	12	27
Operating lease right-of-use assets	358	409
Other	270	246
Total other assets	1,897	1,975
Total assets	22,993	21,922
Current liabilities
Current portion of long-term debt	250	300
Borrowings under utility money pool arrangement	165	0
Short-term debt	0	147
Accounts payable	611	531
Accounts payable to affiliates	87	69
Regulatory liabilities	68	95
Taxes accrued	186	252
Accrued interest	48	58
Dividends payable to parent	127	104
Derivative instruments	37	30
Operating lease liabilities	79	84
Other	119	109
Total current liabilities	1,777	1,779
Deferred credits and other liabilities
Deferred income taxes	2,010	1,960
Regulatory liabilities	2,484	2,397
Asset retirement obligations	448	422
Derivative instruments	7	29
Customer advances	150	160
Pension and employee benefit obligations	4	23
Operating lease liabilities	302	351
Other	204	190
Total deferred credits and other liabilities	5,609	5,532
Commitments and contingencies
Capitalization
Long-term debt	$ 6,608	$ 6,167
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 Sept. 30, 2022 and Dec. 31, 2021, respectively	$ 0	$ 0
Additional paid in capital	6,813	6,426
Retained earnings	2,207	2,040
Accumulated other comprehensive loss	(21)	(22)
Total common stockholder's equity	8,999	8,444
Total liabilities and equity	$ 22,993	$ 21,922

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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, 2020		100
Beginning Balance at Dec. 31, 2020	$ 7,592	$ 0	$ 5,770	$ 1,846	$ (24)
Increase (Decrease) in Stockholder's Equity
Net income	516
Total other comprehensive income	1				1
Dividends declared to parent	(362)			(362)
Contribution of capital by parent	563		563
Balance (in shares) at Sep. 30, 2021		100
Ending Balance at Sep. 30, 2021	8,310	$ 0	6,333	2,000	(23)
Balance (in shares) at Jun. 30, 2021		100
Beginning Balance at Jun. 30, 2021	8,099	$ 0	6,210	1,912	(23)
Increase (Decrease) in Stockholder's Equity
Net income	215			215
Total other comprehensive income	0
Dividends declared to parent	(127)			(127)
Contribution of capital by parent	123		123
Balance (in shares) at Sep. 30, 2021		100
Ending Balance at Sep. 30, 2021	$ 8,310	$ 0	6,333	2,000	(23)
Balance (in shares) at Dec. 31, 2021	100	100
Beginning Balance at Dec. 31, 2021	$ 8,444	$ 0	6,426	2,040	(22)
Increase (Decrease) in Stockholder's Equity
Net income	555
Total other comprehensive income	1				1
Dividends declared to parent	(388)			(388)
Contribution of capital by parent	$ 387		387
Balance (in shares) at Sep. 30, 2022	100	100
Ending Balance at Sep. 30, 2022	$ 8,999	$ 0	6,813	2,207	(21)
Beginning Balance at Jun. 30, 2022	8,688		6,623	2,087
Increase (Decrease) in Stockholder's Equity
Net income	247			247
Total other comprehensive income	1
Dividends declared to parent	(127)			(127)
Contribution of capital by parent	$ 190		190
Balance (in shares) at Sep. 30, 2022	100	100
Ending Balance at Sep. 30, 2022	$ 8,999	$ 0	$ 6,813	$ 2,207	$ (21)

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Management's Opinion

9 Months Ended

Sep. 30, 2022

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 Sept. 30, 2022 and Dec. 31, 2021; the results of PSCo’s operations, including the components of net income, comprehensive income and changes in stockholder’s equity for the three and nine months ended Sept. 30, 2022 and 2021; and PSCo’s cash flows for the nine months ended Sept. 30, 2022 and 2021.

All adjustments are of a normal, recurring nature, except as otherwise disclosed. Management has also evaluated the impact of events occurring after Sept. 30, 2022, 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, 2021 balance sheet information has been derived from the audited 2021 consolidated financial statements included in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2021.

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, 2021, filed with the SEC on Feb. 23, 2022. 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	9 Months Ended
	Sep. 30, 2022
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, 2021 appropriately represent, in all material respects, the current status of accounting policies and are incorporated herein by reference.

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Accounting Pronouncements	9 Months Ended
	Sep. 30, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Pronouncements	As of Sept. 30, 2022, there was no material impact from the recent adoption of new accounting pronouncements, nor expected material impact from recently issued accounting pronouncements yet to be adopted, on PSCO’s consolidated financial statements.

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Selected Balance Sheet Data

9 Months Ended

Sep. 30, 2022

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$	478	$	414
Less allowance for bad debts	(48)		(40)
Accounts receivable, net	$	430	$	374

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	77	$	70
Fuel	85		71
Natural gas	197		104
Total inventories	$	359	$	245

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	15,468	$	16,543
Natural gas plant	5,760		5,471
Common and other property	1,341		1,224
Plant to be retired (a)	1,326		182
Construction work in progress	956		681
Total property, plant and equipment	24,851		24,101
Less accumulated depreciation	(5,542)		(5,657)
Property, plant and equipment, net	$	19,309	$	18,444

(a)Amounts as of Dec. 31, 2021 include Comanche Unit 1 and 2 and Craig Units 1 and 2. Following the June 2022 approval of PSCo’s revised resource plan settlement, amounts as of Sept. 30, 2022 include the addition of Comanche Unit 3, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion. Amounts are reported net of accumulated depreciation.

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Borrowings and Other Financing Instruments

9 Months Ended

Sep. 30, 2022

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 Sept. 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	250		$	250
Amount outstanding at period end	165			—
Average amount outstanding	49			12
Maximum amount outstanding	197			243
Weighted average interest rate, computed on a daily basis	2.06		%	0.07		%
Weighted average interest rate at period end	2.33			N/A

Commercial Paper — Commercial paper outstanding for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	700		$	700
Amount outstanding at period end	—			147
Average amount outstanding	14			26
Maximum amount outstanding	170			322
Weighted average interest rate, computed on a daily basis	2.07		%	0.19		%
Weighted average interest rate at period end	N/A			0.22

Letters of Credit — PSCo uses letters of credit, generally with terms of one year, to provide financial guarantees for certain obligations. At Sept. 30, 2022 and Dec. 31, 2021, there were $26 million and $8 million of letters of credit outstanding under the credit facility, respectively. 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.

In September 2022, PSCo entered into an amended five-year credit agreement with a syndicate of banks, with substantially the same terms and conditions as the prior credit agreements. The maturity was extended from June 2024 to September 2027.

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 Sept. 30, 2022, PSCo had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	700	$	26	$	674

(a)    Expires in September 2027.

(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 Sept. 30, 2022 and Dec. 31, 2021.

Long-Term Borrowings

During the nine months ended Sept. 30, 2022, PSCo issued $300 million of 4.10% first mortgage bonds due June 1, 2032 and $400 million of 4.50% first mortgage bonds due June 1, 2052.

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Revenues

9 Months Ended

Sep. 30, 2022

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 Sept. 30, 2022
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	431	$	136	$	4	$	571
C&I	556		64		7		627
Other	13		—		—		13
Total retail	1,000		200		11		1,211
Wholesale	63		—		—		63
Transmission	25		—		—		25
Other	15		30		—		45
Total revenue from contracts with customers	1,103		230		11		1,344
Alternative revenue and other	34		5		—		39
Total revenues	$	1,137	$	235	$	11	$	1,383

	Three Months Ended Sept. 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	386	$	97	$	3	$	486
C&I	510		38		7		555
Other	12		—		—		12
Total retail	908		135		10		1,053
Wholesale	60		—		—		60
Transmission	23		—		—		23
Other	15		38		—		53
Total revenue from contracts with customers	1,006		173		10		1,189
Alternative revenue and other	42		4		2		48
Total revenues	$	1,048	$	177	$	12	$	1,237
	Nine Months Ended Sept. 30, 2022
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,025	$	686	$	11	$	1,722
C&I	1,383		279		16		1,678
Other	38		—		—		38
Total retail	2,446		965		27		3,438
Wholesale	200		—		—		200
Transmission	65		—		—		65
Other	39		106		—		145
Total revenue from contracts with customers	2,750		1,071		27		3,848
Alternative revenue and other	99		16		12		127
Total revenues	$	2,849	$	1,087	$	39	$	3,975
	Nine Months Ended Sept. 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	904	$	540	$	9	$	1,453
C&I	1,262		203		22		1,487
Other	37		—		—		37
Total retail	2,203		743		31		2,977
Wholesale	195		—		—		195
Transmission	59		—		—		59
Other	37		122		—		159
Total revenue from contracts with customers	2,494		865		31		3,390
Alternative revenue and other	114		65		3		182
Total revenues	$	2,608	$	930	$	34	$	3,572

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Income Taxes

9 Months Ended

Sep. 30, 2022

Income Tax Disclosure [Abstract]

Income Taxes

Reconciliation between the statutory rate and ETR:

	Nine Months Ended Sept. 30
	2022		2021
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	3.6		3.6
Increases (decreases):
Wind PTCs (a)	(14.2)		(12.9)
Plant regulatory differences (b)	(4.4)		(4.1)
Other tax credits, net operating loss & tax credit allowances	(1.1)		(0.7)
Other (net)	0.4		—
Effective income tax rate	5.3	%	6.9	%

(a)Wind PTCs are credited to customers (reduction to revenue) and do not materially impact net income.

(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 taxes are offset by corresponding revenue reductions.

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Fair Value of Financial Assets and Liabilities

9 Months Ended

Sep. 30, 2022

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 NAV.

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

Commodity derivatives — Methods used to measure the fair value of commodity derivative forwards and options utilize forward prices and volatilities, as well as pricing adjustments for specific delivery locations and are generally assigned a Level 2 classification. When contractual settlements relate to inactive delivery locations or extend to periods beyond those readily observable on active exchanges or quoted by brokers, the significance of the use of less observable 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 Sept. 30, 2022, accumulated other comprehensive loss related to 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. As of Sept. 30, 2022, PSCo had no unsettled interest rate derivatives.

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 may enter into derivative instruments that mitigate commodity price risk on behalf of electric and natural gas customers but may not be designated as qualifying hedging transactions. The classification of gains or losses for these instruments as a regulatory asset or liability, if applicable, is based on approved regulatory recovery mechanisms.

As of Sept. 30, 2022, PSCo had no commodity contracts designated as cash flow hedges.

PSCo also 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)	Sept. 30, 2022	Dec. 31, 2021
Megawatt hours of electricity	10	15
Million British thermal units of natural gas	52	71

(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 Sept. 30, 2022, four of PSCo’s ten most significant counterparties for these activities, comprising $53 million, or 45%, 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 $26 million, or 22%, 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. Two of these significant counterparties, comprising $16 million, or 13%, of this credit exposure, had credit quality less than investment grade, based on internal analysis. Six of these significant counterparties are independent system operators, municipal or cooperative electric entities, Regional Transmission Organizations or other utilities.

Impact of Derivative Activity —

Changes in the fair value of natural gas commodity derivatives resulted in net losses of $4 million and $2 million for the three and nine months ended Sept. 30, 2022, respectively, which were recognized as regulatory assets and liabilities. Changes in the fair value of natural gas commodity derivatives resulted in net gains of $37 million and $36 million for the three and nine months ended Sept. 30, 2021, respectively. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms.

	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 Sept. 30, 2022
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	2	(b)
Total	$	—		$	—		$	2
Nine Months Ended Sept. 30, 2022
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	3	(b)
Natural gas commodity	—			2		(c)	(11)		(c)(d)
Total	$	—		$	2		$	(8)
Three Months Ended Sept. 30, 2021
Other derivative instruments
Commodity trading	$	—		$	—		$	11	(b)
Total	$	—		$	—		$	11
Nine Months Ended Sept. 30, 2021
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	25	(b)
Natural gas commodity	—			6		(c)	(6)		(c)(d)
Total	$	—		$	6		$	19

(a)    Recorded to interest charges.

(b)    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)    Recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

(d)    Relates primarily to option premium amortization.

PSCo had no derivative instruments designated as fair value hedges during the three and nine months ended Sept. 30, 2022 and 2021.

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 Sept. 30, 2022 and Dec. 31, 2021, 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 Sept. 30, 2022 and Dec. 31, 2021, there were approximately $2 million and $16 million, respectively, of derivative liabilities with such underlying contract provisions.

Certain derivative instruments are also subject to contract provisions that contain adequate assurance clauses. These provisions allow counterparties to seek performance assurance, including cash collateral, in the event that 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 Sept. 30, 2022 and Dec. 31, 2021.

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

	Sept. 30, 2022												Dec. 31, 2021
	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	$	28	$	116	$	—	$	144	$	(114)	$	30	$	12	$	97	$	—	$	109	$	(81)	$	28
Natural gas commodity	—		18		—		18		—		18		—		11		—		11		—		11
Total current derivative assets	$	28	$	134	$	—	$	162	$	(114)	$	48	$	12	$	108	$	—	$	120	$	(81)	$	39
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	20	$	22	$	16	$	58	$	(46)	$	12	$	10	$	28	$	54	$	92	$	(65)	$	27
Total noncurrent derivative assets	$	20	$	22	$	16	$	58	$	(46)	$	12	$	10	$	28	$	54	$	92	$	(65)	$	27

	Sept. 30, 2022												Dec. 31, 2021
	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	$	12	$	123	$	14	$	149	$	(120)	$	29	$	6	$	90	$	16	$	112	$	(85)	$	27
Natural gas commodity	—		8		—		8		—		8		—		3		—		3		—		3
Total current derivative liabilities	$	12	$	131	$	14	$	157	$	(120)	$	37	$	6	$	93	$	16	$	115	$	(85)	$	30
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	9	$	25	$	26	$	60	$	(53)	$	7	$	3	$	—	$	101	$	104	$	(75)	$	29
Total noncurrent derivative assets	$	9	$	25	$	26	$	60	$	(53)	$	7	$	3	$	—	$	101	$	104	$	(75)	$	29

(a)PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At both Sept. 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include no obligations to return cash collateral. At Sept. 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include rights to reclaim cash collateral of $13 million and $14 million, respectively. 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 Sept. 30
(Millions of Dollars)	2022		2021
Balance at July 1	$	(30)	$	(61)
Settlements	5		4
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	1		(11)
Balance at Sept. 30	$	(24)	$	(68)
	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Balance at Jan. 1	$	(63)	$	(44)
Settlements	9		3
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	30		(27)
Balance at Sept. 30	$	(24)	$	(68)

(a)Level 3 net gains recognized in earnings are subject to offsetting net losses of derivative instruments categorized as levels 1 and 2 in the income statement.

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 nine months ended Sept. 30, 2022 and 2021.

Fair Value of Long-Term Debt

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

	Sept. 30, 2022				Dec. 31, 2021
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	6,858	$	5,785	$	6,467	$	7,291

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 Sept. 30, 2022 and Dec. 31, 2021 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

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Benefit Plans and Other Postretirement Benefits

	Three Months Ended Sept. 30
	2022		2021		2022		2021
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	7	$	8	$	1	$	—
Interest cost (a)	10		9		2		2
Expected return on plan assets (a)	(19)		(18)		(4)		(4)
Amortization of prior service credit (a)	—		—		(1)		(1)
Amortization of net loss (a)	6		9		—		1
Settlement charge (b)	2		—		—		—
Net periodic benefit cost (credit)	6		8		(2)		(2)
Effects of regulation	(2)		(2)		1		1
Net benefit cost (credit) recognized for financial reporting	$	4	$	6	$	(1)	$	(1)
	Nine Months Ended Sept. 30
	2022		2021		2022		2021
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	22	$	24	$	1	$	—
Interest cost (a)	31		29		8		8
Expected return on plan assets (a)	(58)		(54)		(12)		(12)
Amortization of prior service credit (a)	—		—		(2)		(3)
Amortization of net loss (a)	17		24		1		3
Settlement charge (b)	2		—		—		—
Net periodic benefit cost (credit)	14		23		(4)		(4)
Effects of regulation	3		—		2		2
Net benefit cost (credit) recognized for financial reporting	$	17	$	23	$	(2)	$	(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.

(b)A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In the third quarter of 2022 as a result of lump-sum distributions during the 2022 plan year, PSCO recorded a pension settlement charge of $2 million, the majority of which was not recognized due to the effects of regulation.

In January 2022, contributions of $50 million were made across four of Xcel Energy’s pension plans, of which $40 million was attributable to PSCo. Xcel Energy does not expect additional pension contributions during 2022.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2022

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.

Comanche Unit 3 Litigation — In September 2021, CORE filed a lawsuit in Denver County District Court. CORE alleges PSCo breached ownership agreement terms by failing to operate Comanche Unit 3 in accordance with prudent utility practices. In January 2022, the Court granted PSCo’s motion and dismissed CORE’s claims for unjust enrichment, declaratory judgment and damages for replacement power costs. In February 2022, CORE disclosed that it is claiming in excess of $125 million in total damages.

In April 2022, CORE filed a supplement to include the January 2022 outage. It claims additional undisclosed damages arising from this event. PSCo continues to believe CORE’s claims are without merit.

Rate Matters

PSCo is involved in various regulatory proceedings arising in the ordinary course of business. Until resolution, typically in the form of a rate order, uncertainties may exist regarding the ultimate rate treatment for certain activities and transactions. Amounts have been recognized for probable and reasonably estimable losses that may result. Unless otherwise disclosed, any reasonably possible range of loss in excess of any recognized amount is not expected to have a material effect on the financial statements.

Environmental

MGP, Landfill and Disposal Sites

PSCo is investigating, remediating or performing post-closure actions at two 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 are 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 applicable landfills and surface impoundments as well as perform corrective actions where offsite groundwater has been impacted.

As of Sept. 30, 2022, PSCo has five regulated ash units in operation with two sites being evaluated for corrective actions.

PSCo is currently exploring an agreement with a third party that would excavate and process ash for beneficial use (at two sites) at a cost of approximately $43 million. An estimated liability has been recorded for this amount. PSCo anticipates these costs will be fully recoverable through regulatory mechanisms.

Investigation and feasibility studies for additional corrective action related to offsite groundwater are ongoing (at two sites). While the results are uncertain, additional costs are estimated to be up to $35 million.

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 Sept. 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	22	$	26
Other operating leases (a)	3		2
Total operating lease expense (b)	$	25	$	28
Finance leases
Amortization of ROU assets	$	1	$	2
Interest expense on lease liability	4		4
Total finance lease expense	$	5	$	6

(a)Includes immaterial short-term lease expense for 2022 and 2021.

(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.

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	70	$	77
Other operating leases (a)	13		9
Total operating lease expense (b)	$	83	$	86
Finance leases
Amortization of ROU assets	$	3	$	6
Interest expense on lease liability	12		12
Total finance lease expense	$	15	$	18

(a)Includes short-term lease expense of $1 million for 2022 and 2021, 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 Sept. 30, 2022:

(Millions of Dollars)	PPA Operating Leases		Other Operating Lease		Total Operating Leases		Finance Leases
Total minimum obligation	$	388	$	44	$	432	$	454
Interest component of obligation	(46)		(5)		(51)		(332)
Present value of minimum obligation	$	342	$	39	381		122
Less current portion					(79)		(5)
Noncurrent operating and finance lease liabilities					$	302	$	117

Variable Interest Entities 

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 they purchase. These specific PPAs create a variable interest in the IPP.

PSCo had approximately 1,442 MW and 1518 MW of capacity under long-term PPAs at Sept. 30, 2022 and Dec. 31, 2021 with entities that have been determined to be variable interest entities. 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

9 Months Ended

Sep. 30, 2022

Stockholders' Equity Note [Abstract]

Other Comprehensive Income

Changes in accumulated other comprehensive loss, net of tax, for the three and nine months ended Sept. 30, 2022 and 2021:

	Three Months Ended Sept. 30, 2022						Three Months Ended Sept. 30, 2021
(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 July 1	$	(21)	$	(1)	$	(22)	$	(22)	$	(1)	$	(23)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	1		—		1		—		—		—
Net current period other comprehensive income	1		—		1		—		—		—
Accumulated other comprehensive loss at Sept. 30	$	(20)	$	(1)	$	(21)	$	(22)	$	(1)	$	(23)

	Nine Months Ended Sept. 30, 2022						Nine Months Ended Sept. 30, 2021
(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	$	(21)	$	(1)	$	(22)	$	(23)	$	(1)	$	(24)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	1		—		1		1		—		1
Net current period other comprehensive income	1		—		1		1		—		1
Accumulated other comprehensive loss at Sept. 30	$	(20)	$	(1)	$	(21)	$	(22)	$	(1)	$	(23)

(a) Included in interest charges.

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Segment Information

9 Months Ended

Sep. 30, 2022

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. The regulated electric utility segment 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.

Certain costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators across each segment. In addition, a general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

PSCo’s segment information:

	Three Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues	$	1,137	$	1,048
Net income	243		212
Regulated Natural Gas
Total revenues	$	235	$	177
Net income	4		8
All Other
Total revenues (a)	$	11	$	12
Net loss	—		(5)
Consolidated Total
Total revenues (a)	$	1,383	$	1,237
Net income	247		215

(a)    Total revenues include $2 million and $1 million of other affiliate revenue for the three months ended Sept. 30, 2022 and 2021.

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Regulated Electric
Operating revenues — external	$	2,849	$	2,608
Intersegment revenue	—		1
Total revenues	2,849		2,609
Net income	455		400
Regulated Natural Gas
Total revenues	$	1,087	$	930
Net income	99		121
All Other
Total revenues (a)	$	39	$	34
Net income (loss)	1		(5)
Consolidated Total
Total revenues (a)	$	3,975	$	3,573
Reconciling eliminations	—		(1)
Total operating revenues	$	3,975	$	3,572
Net income	555		516

(a)    Total revenues include $4 million and $3 million of other affiliate revenue for the nine months ended Sept. 30, 2022 and 2021.

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Selected Balance Sheet Data (Tables)

9 Months Ended

Sep. 30, 2022

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$	478	$	414
Less allowance for bad debts	(48)		(40)
Accounts receivable, net	$	430	$	374

Inventories

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	77	$	70
Fuel	85		71
Natural gas	197		104
Total inventories	$	359	$	245

Property, Plant and Equipment, Net

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	15,468	$	16,543
Natural gas plant	5,760		5,471
Common and other property	1,341		1,224
Plant to be retired (a)	1,326		182
Construction work in progress	956		681
Total property, plant and equipment	24,851		24,101
Less accumulated depreciation	(5,542)		(5,657)
Property, plant and equipment, net	$	19,309	$	18,444

(a)Amounts as of Dec. 31, 2021 include Comanche Unit 1 and 2 and Craig Units 1 and 2. Following the June 2022 approval of PSCo’s revised resource plan settlement, amounts as of Sept. 30, 2022 include the addition of Comanche Unit 3, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion. Amounts are reported net of accumulated depreciation.

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Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2022

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	700		$	700
Amount outstanding at period end	—			147
Average amount outstanding	14			26
Maximum amount outstanding	170			322
Weighted average interest rate, computed on a daily basis	2.07		%	0.19		%
Weighted average interest rate at period end	N/A			0.22

Credit Facilities

At Sept. 30, 2022, PSCo had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	700	$	26	$	674

(a)    Expires in September 2027.

(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 Sept. 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	250		$	250
Amount outstanding at period end	165			—
Average amount outstanding	49			12
Maximum amount outstanding	197			243
Weighted average interest rate, computed on a daily basis	2.06		%	0.07		%
Weighted average interest rate at period end	2.33			N/A

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Revenues (Tables)

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

PSCo’s operating revenues consisted of the following:

	Three Months Ended Sept. 30, 2022
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	431	$	136	$	4	$	571
C&I	556		64		7		627
Other	13		—		—		13
Total retail	1,000		200		11		1,211
Wholesale	63		—		—		63
Transmission	25		—		—		25
Other	15		30		—		45
Total revenue from contracts with customers	1,103		230		11		1,344
Alternative revenue and other	34		5		—		39
Total revenues	$	1,137	$	235	$	11	$	1,383

	Three Months Ended Sept. 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	386	$	97	$	3	$	486
C&I	510		38		7		555
Other	12		—		—		12
Total retail	908		135		10		1,053
Wholesale	60		—		—		60
Transmission	23		—		—		23
Other	15		38		—		53
Total revenue from contracts with customers	1,006		173		10		1,189
Alternative revenue and other	42		4		2		48
Total revenues	$	1,048	$	177	$	12	$	1,237
	Nine Months Ended Sept. 30, 2022
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,025	$	686	$	11	$	1,722
C&I	1,383		279		16		1,678
Other	38		—		—		38
Total retail	2,446		965		27		3,438
Wholesale	200		—		—		200
Transmission	65		—		—		65
Other	39		106		—		145
Total revenue from contracts with customers	2,750		1,071		27		3,848
Alternative revenue and other	99		16		12		127
Total revenues	$	2,849	$	1,087	$	39	$	3,975
	Nine Months Ended Sept. 30, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	904	$	540	$	9	$	1,453
C&I	1,262		203		22		1,487
Other	37		—		—		37
Total retail	2,203		743		31		2,977
Wholesale	195		—		—		195
Transmission	59		—		—		59
Other	37		122		—		159
Total revenue from contracts with customers	2,494		865		31		3,390
Alternative revenue and other	114		65		3		182
Total revenues	$	2,608	$	930	$	34	$	3,572

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2022

Income Tax Disclosure [Abstract]

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

Reconciliation between the statutory rate and ETR:

	Nine Months Ended Sept. 30
	2022		2021
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	3.6		3.6
Increases (decreases):
Wind PTCs (a)	(14.2)		(12.9)
Plant regulatory differences (b)	(4.4)		(4.1)
Other tax credits, net operating loss & tax credit allowances	(1.1)		(0.7)
Other (net)	0.4		—
Effective income tax rate	5.3	%	6.9	%

(a)Wind PTCs are credited to customers (reduction to revenue) and do not materially impact net income.

(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 taxes are offset by corresponding revenue reductions.

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Fair Value of Financial Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2022

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)	Sept. 30, 2022	Dec. 31, 2021
Megawatt hours of electricity	10	15
Million British thermal units of natural gas	52	71

(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 Sept. 30, 2022
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	2	(b)
Total	$	—		$	—		$	2
Nine Months Ended Sept. 30, 2022
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	3	(b)
Natural gas commodity	—			2		(c)	(11)		(c)(d)
Total	$	—		$	2		$	(8)
Three Months Ended Sept. 30, 2021
Other derivative instruments
Commodity trading	$	—		$	—		$	11	(b)
Total	$	—		$	—		$	11
Nine Months Ended Sept. 30, 2021
Derivatives designated as cash flow hedges
Interest rate	$	1	(a)	$	—		$	—
Total	$	1		$	—		$	—
Other derivative instruments
Commodity trading	$	—		$	—		$	25	(b)
Natural gas commodity	—			6		(c)	(6)		(c)(d)
Total	$	—		$	6		$	19

(a)    Recorded to interest charges.

(b)    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)    Recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

(d)    Relates primarily to option premium amortization.

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

	Sept. 30, 2022												Dec. 31, 2021
	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	$	28	$	116	$	—	$	144	$	(114)	$	30	$	12	$	97	$	—	$	109	$	(81)	$	28
Natural gas commodity	—		18		—		18		—		18		—		11		—		11		—		11
Total current derivative assets	$	28	$	134	$	—	$	162	$	(114)	$	48	$	12	$	108	$	—	$	120	$	(81)	$	39
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	20	$	22	$	16	$	58	$	(46)	$	12	$	10	$	28	$	54	$	92	$	(65)	$	27
Total noncurrent derivative assets	$	20	$	22	$	16	$	58	$	(46)	$	12	$	10	$	28	$	54	$	92	$	(65)	$	27

	Sept. 30, 2022												Dec. 31, 2021
	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	$	12	$	123	$	14	$	149	$	(120)	$	29	$	6	$	90	$	16	$	112	$	(85)	$	27
Natural gas commodity	—		8		—		8		—		8		—		3		—		3		—		3
Total current derivative liabilities	$	12	$	131	$	14	$	157	$	(120)	$	37	$	6	$	93	$	16	$	115	$	(85)	$	30
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	9	$	25	$	26	$	60	$	(53)	$	7	$	3	$	—	$	101	$	104	$	(75)	$	29
Total noncurrent derivative assets	$	9	$	25	$	26	$	60	$	(53)	$	7	$	3	$	—	$	101	$	104	$	(75)	$	29

(a)PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At both Sept. 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include no obligations to return cash collateral. At Sept. 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include rights to reclaim cash collateral of $13 million and $14 million, respectively. 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 Sept. 30
(Millions of Dollars)	2022		2021
Balance at July 1	$	(30)	$	(61)
Settlements	5		4
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	1		(11)
Balance at Sept. 30	$	(24)	$	(68)
	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Balance at Jan. 1	$	(63)	$	(44)
Settlements	9		3
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	30		(27)
Balance at Sept. 30	$	(24)	$	(68)

(a)Level 3 net gains recognized in earnings are subject to offsetting net losses of derivative instruments categorized as levels 1 and 2 in the income statement.

Carrying Amount and Fair Value of Long-term Debt

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

	Sept. 30, 2022				Dec. 31, 2021
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	6,858	$	5,785	$	6,467	$	7,291

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Benefit Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost (Credit)

	Three Months Ended Sept. 30
	2022		2021		2022		2021
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	7	$	8	$	1	$	—
Interest cost (a)	10		9		2		2
Expected return on plan assets (a)	(19)		(18)		(4)		(4)
Amortization of prior service credit (a)	—		—		(1)		(1)
Amortization of net loss (a)	6		9		—		1
Settlement charge (b)	2		—		—		—
Net periodic benefit cost (credit)	6		8		(2)		(2)
Effects of regulation	(2)		(2)		1		1
Net benefit cost (credit) recognized for financial reporting	$	4	$	6	$	(1)	$	(1)
	Nine Months Ended Sept. 30
	2022		2021		2022		2021
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	22	$	24	$	1	$	—
Interest cost (a)	31		29		8		8
Expected return on plan assets (a)	(58)		(54)		(12)		(12)
Amortization of prior service credit (a)	—		—		(2)		(3)
Amortization of net loss (a)	17		24		1		3
Settlement charge (b)	2		—		—		—
Net periodic benefit cost (credit)	14		23		(4)		(4)
Effects of regulation	3		—		2		2
Net benefit cost (credit) recognized for financial reporting	$	17	$	23	$	(2)	$	(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.

(b)A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In the third quarter of 2022 as a result of lump-sum distributions during the 2022 plan year, PSCO recorded a pension settlement charge of $2 million, the majority of which was not recognized due to the effects of regulation.

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Commitment and Contingencies (Tables)

3 Months Ended

9 Months Ended

Sep. 30, 2022

Sep. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Schedule of Components of Lease Expense

Components of lease expense:

	Three Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	22	$	26
Other operating leases (a)	3		2
Total operating lease expense (b)	$	25	$	28
Finance leases
Amortization of ROU assets	$	1	$	2
Interest expense on lease liability	4		4
Total finance lease expense	$	5	$	6

(a)Includes immaterial short-term lease expense for 2022 and 2021.

(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.

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	70	$	77
Other operating leases (a)	13		9
Total operating lease expense (b)	$	83	$	86
Finance leases
Amortization of ROU assets	$	3	$	6
Interest expense on lease liability	12		12
Total finance lease expense	$	15	$	18

(a)Includes short-term lease expense of $1 million for 2022 and 2021, 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 Sept. 30, 2022:

(Millions of Dollars)	PPA Operating Leases		Other Operating Lease		Total Operating Leases		Finance Leases
Total minimum obligation	$	388	$	44	$	432	$	454
Interest component of obligation	(46)		(5)		(51)		(332)
Present value of minimum obligation	$	342	$	39	381		122
Less current portion					(79)		(5)
Noncurrent operating and finance lease liabilities					$	302	$	117

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Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2022

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 nine months ended Sept. 30, 2022 and 2021:

	Three Months Ended Sept. 30, 2022						Three Months Ended Sept. 30, 2021
(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 July 1	$	(21)	$	(1)	$	(22)	$	(22)	$	(1)	$	(23)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	1		—		1		—		—		—
Net current period other comprehensive income	1		—		1		—		—		—
Accumulated other comprehensive loss at Sept. 30	$	(20)	$	(1)	$	(21)	$	(22)	$	(1)	$	(23)

	Nine Months Ended Sept. 30, 2022						Nine Months Ended Sept. 30, 2021
(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	$	(21)	$	(1)	$	(22)	$	(23)	$	(1)	$	(24)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	1		—		1		1		—		1
Net current period other comprehensive income	1		—		1		1		—		1
Accumulated other comprehensive loss at Sept. 30	$	(20)	$	(1)	$	(21)	$	(22)	$	(1)	$	(23)

(a) Included in interest charges.

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Results from Operations by Reportable Segment

PSCo’s segment information:

	Three Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues	$	1,137	$	1,048
Net income	243		212
Regulated Natural Gas
Total revenues	$	235	$	177
Net income	4		8
All Other
Total revenues (a)	$	11	$	12
Net loss	—		(5)
Consolidated Total
Total revenues (a)	$	1,383	$	1,237
Net income	247		215

(a)    Total revenues include $2 million and $1 million of other affiliate revenue for the three months ended Sept. 30, 2022 and 2021.

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Regulated Electric
Operating revenues — external	$	2,849	$	2,608
Intersegment revenue	—		1
Total revenues	2,849		2,609
Net income	455		400
Regulated Natural Gas
Total revenues	$	1,087	$	930
Net income	99		121
All Other
Total revenues (a)	$	39	$	34
Net income (loss)	1		(5)
Consolidated Total
Total revenues (a)	$	3,975	$	3,573
Reconciling eliminations	—		(1)
Total operating revenues	$	3,975	$	3,572
Net income	555		516

(a)    Total revenues include $4 million and $3 million of other affiliate revenue for the nine months ended Sept. 30, 2022 and 2021.

^[1]

[1] Total revenues include $4 million and $3 million of other affiliate revenue for the nine months ended Sept. 30, 2022 and 2021.

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Selected Balance Sheet Data (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$ 478	$ 414
Less allowance for bad debts	(48)	(40)
Accounts receivable, net	$ 430	$ 374

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Selected Balance Sheet Data Balance Sheet Related Disclosures, Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Public Utilities, Inventory [Line Items]
Total inventories	$ 359	$ 245
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventories	77	70
Fuel
Public Utilities, Inventory [Line Items]
Inventories	85	71
Natural gas
Public Utilities, Inventory [Line Items]
Inventories	$ 197	$ 104

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Selected Balance Sheet Data Balance Sheet Related Disclosures, Property, Plant and Equipment (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 24,851	$ 24,101
Less accumulated depreciation		(5,542)	(5,657)
Property, plant and equipment, net		19,309	18,444
Electric plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		15,468	16,543
Natural gas plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		5,760	5,471
Common and other property
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		1,341	1,224
Plant to be retired
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	[1]	1,326	182
Construction work in progress
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 956	$ 681

[1] Amounts as of Dec. 31, 2021 include Comanche Unit 1 and 2 and Craig Units 1 and 2. Following the June 2022 approval of PSCo’s revised resource plan settlement, amounts as of Sept. 30, 2022 include the addition of Comanche Unit 3, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion. Amounts are reported net of accumulated depreciation.

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Borrowings and Other Financing Instruments - Short-Term Borrowings (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Short-term debt	$ 0	$ 147,000,000
Money Pool
Short-term Debt [Line Items]
Borrowing limit	250,000,000	250,000,000
Short-term debt	165,000,000	0
Average amount outstanding	49,000,000	12,000,000
Maximum amount outstanding	$ 197,000,000	$ 243,000,000
Weighted average interest rate, computed on a daily basis (percentage)	2.06%	0.07%
Short-term Debt, Weighted Average Interest Rate, at Point in Time	2.33%
Commercial Paper
Short-term Debt [Line Items]
Borrowing limit	$ 700,000,000	$ 700,000,000
Short-term debt	0	147,000,000
Average amount outstanding	14,000,000	26,000,000
Maximum amount outstanding	$ 170,000,000	$ 322,000,000
Weighted average interest rate, computed on a daily basis (percentage)	2.07%	0.19%
Short-term Debt, Weighted Average Interest Rate, at Point in Time		0.22%

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Borrowings and Other Financing Instruments - Letters of Credit (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Term of letters of credit (in years)	1 year
Short-term debt	$ 0	$ 147
Letter of Credit
Line of Credit Facility [Line Items]
Short-term debt	$ 26	$ 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)		9 Months Ended
		Sep. 30, 2022 USD ($) Plan	Dec. 31, 2021 USD ($)
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]	26,000,000
Available		674,000,000
Direct advances on the credit facility outstanding		$ 0	$ 0

[1] Expires in September 2027.

[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)	9 Months Ended
	Sep. 30, 2022 USD ($)
Debt Instrument [Line Items]
Term of letters of credit (in years)	1 year
Bonds [Member] | Series Due June 1, 2032
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.10%
Bonds [Member] | Series Due June 1, 2052
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.50%

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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 1,211	$ 1,053	$ 3,438	$ 2,977
Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	571	486	1,722	1,453
Retail | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	627	555	1,678	1,487
Retail | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	13	12	38	37
Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	63	60	200	195
Transmission Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25	23	65	59
Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	45	53	145	159
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,344	1,189	3,848	3,390
Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	39	48	127	182
Regulated Electric | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,000	908	2,446	2,203
Regulated Electric | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	431	386	1,025	904
Regulated Electric | Retail | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	556	510	1,383	1,262
Regulated Electric | Retail | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	13	12	38	37
Regulated Electric | Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	63	60	200	195
Regulated Electric | Transmission Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25	23	65	59
Regulated Electric | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	15	15	39	37
Regulated Electric | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,103	1,006	2,750	2,494
Regulated Electric | Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	34	42	99	114
Regulated Natural Gas | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	200	135	965	743
Regulated Natural Gas | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	136	97	686	540
Regulated Natural Gas | Retail | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	64	38	279	203
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	30	38	106	122
Regulated Natural Gas | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	230	173	1,071	865
Regulated Natural Gas | Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	5	4	16	65
All Other | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	11	10	27	31
All Other | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4	3	11	9
All Other | Retail | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	7	7	16	22
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 | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	11	10	27	31
All Other | Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	0	2	12	3
Total revenues
Disaggregation of Revenue [Line Items]
Total revenues	1,383	1,237	3,975	3,572
Total revenues | Regulated Electric
Disaggregation of Revenue [Line Items]
Total revenues	1,137	1,048	2,849	2,608
Total revenues | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Total revenues	235	177	1,087	930
Total revenues | All Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 11	$ 12	$ 39	$ 34

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Income Taxes (Details)		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent		3.60%	3.60%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	[1]	(14.20%)	(12.90%)
Effective Income Tax Rate Reconciliation, Other Regulatory Items, Percent	[2]	(4.40%)	(4.10%)
Effective Income Tax Rate Reconciliation, Net Operating Loss Carryback, Percent		(1.10%)	(0.70%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent		0.40%	0.00%
Effective Income Tax Rate Reconciliation, Percent		5.30%	6.90%

[1] Wind PTCs are credited to customers (reduction to revenue) and do not materially impact net income.

[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 taxes are offset by corresponding revenue reductions.

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Fair Value of Financial Assets and Liabilities - Interest Rate Derivatives (Details) - Interest Rate Swap $ in Millions	Sep. 30, 2022 USD ($)
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
Derivative Liability, Notional Amount	$ 0

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Fair Value of Financial Assets and Liabilities - Commodity Derivatives (Details) MWh in Millions, MMBTU in Millions, $ in Millions		Sep. 30, 2022 USD ($) MMBTU MWh	Dec. 31, 2021 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]	10	15
Natural Gas Commodity (in million British thermal units)
Derivative [Line Items]
Derivative, Nonmonetary Notional amount | MMBTU	[1],[2]	52	71

[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.

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Fair Value of Financial Assets and Liabilities - Consideration of Credit Risk and Concentrations (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022 USD ($) Counterparty	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Counterparty	Sep. 30, 2021 USD ($)
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]
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	(2)	6
Pre-tax gains (losses) recognized during the period in income		2	11	(8)	19
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	1
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0		0	0
Pre-tax gains (losses) recognized during the period in income		0		0	0
Natural Gas Commodity
Consideration of Credit Risk and Concentrations [Abstract]
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		4	37	2	36
Natural Gas Commodity | 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
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)	[1]			(2)	6
Pre-tax gains (losses) recognized during the period in income	[1],[2]			(11)	(6)
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	[3]	2	$ 11	3	25
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	[4]	1		1	1
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0		0	0
Pre-tax gains (losses) recognized during the period in income		$ 0		$ 0	$ 0
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		6		6
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		4		4
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties		$ 53		$ 53
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		45.00%		45.00%
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		$ 26		$ 26
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		22.00%		22.00%
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		2		2
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)		13.00%		13.00%

[1] Recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

[2] Relates primarily to option premium amortization.

[3] 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.

[4] Recorded to interest charges.

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Fair Value of Financial Assets and Liabilities - Credit Related Contingent Features (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
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	$ 2	$ 16

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Fair Value of Financial Assets and Liabilities - Recurring Fair Value Measurements (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Return Cash Collateral		$ 0	$ 0
Reclaim Cash Collateral		13	14
Fair Value Measured on a Recurring Basis | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		162	120
Netting	[1]	(114)	(81)
Derivative Asset, Net		48	39
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		28	12
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		134	108
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		0	0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		144	109
Netting	[1]	(114)	(81)
Derivative Asset, Net		30	28
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		18	11
Netting	[1]	0	0
Derivative Asset, Net		18	11
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		28	12
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		116	97
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		18	11
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		0	0
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		58	92
Netting	[1]	(46)	(65)
Derivative Asset, Net		12	27
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		20	10
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		22	28
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		16	54
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		58	92
Netting	[1]	(46)	(65)
Derivative Asset, Net		12	27
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		20	10
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		22	28
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		16	54
Fair Value Measured on a Recurring Basis | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		157	115
Netting	[1]	(120)	(85)
Derivative Liability, Net		37	30
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 1
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		12	6
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 2
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		131	93
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 3
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		14	16
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		149	112
Netting	[1]	(120)	(85)
Derivative Liability, Net		29	27
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		8	3
Netting	[1]	0	0
Derivative Liability, Net		8	3
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		12	6
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		123	90
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		8	3
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		14	16
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		60	104
Netting	[1]	(53)	(75)
Derivative Liability, Net		7	29
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 1
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		9	3
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 2
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		25	0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		26	101
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		60	104
Netting	[1]	(53)	(75)
Derivative Liability, Net		7	29
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		9	3
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		25	0
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		$ 26	$ 101

[1] PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At both Sept. 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include no obligations to return cash collateral. At Sept. 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include rights to reclaim cash collateral of $13 million and $14 million, respectively. 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				9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022	Sep. 30, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ (30)		$ (61)		$ (63)	$ (44)
Settlements	5		4		9	3
(Losses) gains recognized in earnings	1	[1]	(11)	[1]	30	(27)
Ending Balance	(24)		(68)		$ (24)	$ (68)
Transfers Level 3, Net	$ 0		$ 0

[1] Level 3 net gains recognized in earnings are subject to offsetting net losses of derivative instruments categorized as levels 1 and 2 in the income statement.

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Fair Value of Financial Assets and Liabilities - Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 6,858	$ 6,467
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value	$ 5,785	$ 7,291

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Benefit Plans and Other Postretirement Benefits (Details) $ in Millions		1 Months Ended	3 Months Ended				9 Months Ended
		Jan. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)		Sep. 30, 2021 USD ($)		Sep. 30, 2022 USD ($)		Sep. 30, 2021 USD ($)		Jan. 01, 2022 Plan
Pension Plan [Member]
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Service cost			$ 7		$ 8		$ 22		$ 24
Interest Cost	[1]		10		9		31		29
Expected return on Plan Assets	[1]		(19)		(18)		(58)		(54)
Amortization of prior service credit			0		0		0		0
Amortization of net loss	[1]		6		9		17		24
Net periodic benefit cost (credit)			6		8		14		23
Effects of regulation			(2)		(2)		3		0
Net benefit cost (credit) recognized for financial reporting			4		6		17		23
Total contributions to the pension plans during the period		$ 40
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			2	[2]	0		2	[2]	0
Pension Plan [Member] | Xcel Energy Inc.
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Total contributions to the pension plans during the period		$ 50
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			1		0		1		0
Interest Cost	[1]		2		2		8		8
Expected return on Plan Assets	[1]		(4)		(4)		(12)		(12)
Amortization of prior service credit	[1]		(1)		(1)		(2)		(3)
Amortization of net loss			0		1	[1]	1	[1]	3	[1]
Net periodic benefit cost (credit)			(2)		(2)		(4)		(4)
Effects of regulation			1		1		2		2
Net benefit cost (credit) recognized for financial reporting			(1)		(1)		(2)		(2)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			$ 0		$ 0		$ 0		$ 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.

[2] A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In the third quarter of 2022 as a result of lump-sum distributions during the 2022 plan year, PSCO recorded a pension settlement charge of $2 million, the majority of which was not recognized due to the effects of regulation.

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Commitments and Contingencies - MGP, Landfill and Disposal Sites (Details)	Sep. 30, 2022
Other MGP, Landfill, or Disposal Sites
Loss Contingencies [Line Items]
Number of identified MGP sites under current investigation and/or remediation	2

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Commitments and Contingencies - Environmental Requirements - Water and Waste (Details) - Federal Coal Ash Regulation $ in Millions	Sep. 30, 2022 USD ($) Plan
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 corrective action options are being evaluated for locations with statistically significant increases above background concentrations | Plan	2
Estimated cost to remediate groundwater sampling results	$ 35
Maximum [Member]
Site Contingency [Line Items]
Cost of Beneficial Use Coal Ash Project	$ 43

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Commitments and Contingencies - Leases (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021		Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 25	[1]	$ 28	[1]	$ 83	[2]	$ 86	[2]
Finance Lease, Right-of-Use Asset, Amortization	1		2		3		6
Finance Lease, Interest Expense	4		4		12		12
Finance Lease, Cost	5		6		15		18
Lessee, Operating Lease, Liability, Payments, Due	432				432
Total minimum obligation	454				454
Interest component of obligation	(51)				(51)
Finance Lease, Liability, Undiscounted Excess Amount	(332)				(332)
Operating Lease, Liability	381				381
Finance Lease, Liability	122				122
Less current portion	(79)				(79)				$ (84)
Less current portion	(5)				(5)
Operating lease liabilities	302				302				$ 351
Noncurrent operating and finance lease liabilities	117				117
Short-term Lease, Cost					1		1
PPAs
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	22		26		70		77
Lessee, Operating Lease, Liability, Payments, Due	388				388
Interest component of obligation	(46)				(46)
Operating Lease, Liability	342				342
Other
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	3	[3]	$ 2	[3]	13	[4]	$ 9	[4]
Lessee, Operating Lease, Liability, Payments, Due	44				44
Interest component of obligation	(5)				(5)
Operating Lease, Liability	$ 39				$ 39

[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 short-term lease expense of $1 million for 2022 and 2021, respectively.

[4] Includes immaterial short-term lease expense for 2022 and 2021.

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VIEs (Details) - MW	Sep. 30, 2022	Dec. 31, 2021
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Other Commitments [Line Items]
Generating capacity under long term purchased power agreements (in MW)	1,442	1,518

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Commitments and Contingencies - Comanche Unit 3 Litigation (Details) $ in Millions	Sep. 30, 2022 USD ($)
Other Commitments [Line Items]
Comanche Unit 3 Litigation	$ 125

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Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period				$ 8,444
Accumulated other comprehensive loss at end of period		$ 8,999		8,999
Income Tax Expense (Benefit)		31	$ 24	31	$ 38
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		(21)	(22)	(21)	(23)
Net current period other comprehensive loss		1	0	1	1
Accumulated other comprehensive loss at end of period		(20)	(22)	(20)	(22)
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	[1]	(1)	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)	(1)	(1)	(1)
Net current period other comprehensive loss		0	0	0	0
Accumulated other comprehensive loss at end of period		(1)	(1)	(1)	(1)
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	[1]	0	0	0	0
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period		(22)	(23)	(22)	(24)
Net current period other comprehensive loss		1	0	1	1
Accumulated other comprehensive loss at end of period		(21)	(23)	(21)	(23)
Total | Interest Rate Swap
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Losses reclassified from net accumulated other comprehensive loss	[1]	$ (1)	$ 0	$ (1)	$ (1)

[1] Included in interest charges.

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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021
Segment Reporting Information [Line Items]
Regulated Operating Revenue, Electric	$ 1,137		$ 1,048		$ 2,849		$ 2,608
Revenues Including Intersegment Revenues					2,849		2,609
Net income	247		215		555		516
Unregulated Operating Revenue	11		12		39		34
Regulated and Unregulated Operating Revenue	1,383		1,237		3,975		3,572
Affiliate Revenue	2		2		4		4
Total revenues
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	1,383	[1]	1,237	[1]	3,975	[2]	3,573	[2]
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	0						(1)
Regulated Electric
Segment Reporting Information [Line Items]
Revenues Including Intersegment Revenues	1,137		1,048				2,608
Net income	243		212		455		400
Regulated Electric | Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated Operating Revenue, Electric	0						1
Regulated Natural Gas
Segment Reporting Information [Line Items]
Revenues Including Intersegment Revenues	235		177		1,087		930
Net income	4		8		99		121
All Other
Segment Reporting Information [Line Items]
Net income	0		(5)		1		(5)
All Other | Total revenues
Segment Reporting Information [Line Items]
Unregulated Operating Revenue	$ 11	[1]	$ 12	[1]	$ 39	[2]	$ 34	[2]

[1] Total revenues include $2 million and $1 million of other affiliate revenue for the three months ended Sept. 30, 2022 and 2021.

[2] Total revenues include $4 million and $3 million of other affiliate revenue for the nine months ended Sept. 30, 2022 and 2021.