10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended June 30, 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: 001-03140

Northern States Power Company

(Exact Name of Registrant as Specified in its Charter)

Wisconsin			39-0508315
(State or Other Jurisdiction of Incorporation or Organization)			(I.R.S Employer Identification No.)
1414 West Hamilton Avenue	Eau Claire	Wisconsin	54701
(Address of Principal Executive Offices)			(Zip Code)

(715)	737-2625
(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 July 28, 2022
Common Stock, $100 par value	933,000 shares

Northern States Power Company 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 Cash Flows	5
	Consolidated Balance Sheets	6
	Consolidated Statements of Common Stockholder's Equity	7
	Notes to Consolidated Financial Statements	8
Item 2 —	Management’s Discussion and Analysis of Financial Condition and Results of Operations	13
Item 4 —	Controls and Procedures	14
PART II	OTHER INFORMATION
Item 1 —	Legal Proceedings	15
Item 1A —	Risk Factors	15
Item 6 —	Exhibits	15
SIGNATURES		16

This Form 10-Q is filed by NSP-Wisconsin. NSP-Wisconsin 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 System	The electric production and transmission system of NSP-Minnesota and NSP-Wisconsin operated on an integrated basis and managed by NSP-Minnesota
NSP-Wisconsin	Northern States Power Company, a Wisconsin corporation
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
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
PSCW	Public Service Commission of Wisconsin
SEC	Securities and Exchange Commission

Other
ACE	Affordable Clean Energy
C&I	Commercial and Industrial
CEO	Chief executive officer
CFO	Chief financial officer
CPP	Clean Power Plan
CSPV	Crystalline Silicon Photovoltaic
GAAP	United States generally accepted accounting principles
MGP	Manufactured gas plant
MISO	Midcontinent Independent System Operator, Inc.
O&M	Operating and maintenance
ROE	Return on equity
TOs	Transmission owners

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 NSP-Wisconsin'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 inflation rates, monetary fluctuations, supply chain constraints and their impact on capital expenditures and/or the ability of NSP-Wisconsin and its subsidiaries to obtain financing on favorable terms; availability or cost of capital; our customers’ and counterparties’ ability to pay their debts to us; assumptions and costs relating to funding our employee benefit plans and health care benefits; 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; and regulatory changes and/or limitations related to the use of natural gas as an energy source.

PART I — FINANCIAL INFORMATION

ITEM 1 — FINANCIAL STATEMENTS

NSP-WISCONSIN AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

(amounts in millions)

	Three Months Ended June 30				Six Months Ended June 30
	2022		2021		2022		2021
Operating revenues
Electric, non-affiliates	$	191	$	178	$	394	$	356
Electric, affiliates	52		46		99		92
Natural gas	35		31		113		88
Total operating revenues	278		255		606		536
Operating expenses
Electric fuel and purchased power, non-affiliates	4		5		8		10
Purchased power, affiliates	120		106		228		206
Cost of natural gas sold and transported	20		20		65		51
O&M expenses	54		50		107		99
Conservation program expenses	3		3		6		6
Depreciation and amortization	40		36		78		73
Taxes (other than income taxes)	7		8		15		15
Total operating expenses	248		228		507		460
Operating income	30		27		99		76
Other expense, net	(1)		—		(1)		—
Allowance for funds used during construction — equity	1		1		3		2
Interest charges and financing costs
Interest charges, includes other financing costs of $1, $—, $1 and $—, respectively	11		12		22		21
Allowance for funds used during construction — debt	—		(1)		(1)		(1)
Total interest charges and financing costs	11		11		21		20
Income before income taxes	19		17		80		58
Income tax expense	4		3		18		12
Net income	$	15	$	14	$	62	$	46

See Notes to Consolidated Financial Statements

4

NSP-WISCONSIN AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

(amounts in millions)

	Six Months Ended June 30
	2022		2021
Operating activities
Net income	$	62	$	46
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	78		73
Deferred income taxes	(1)		10
Allowance for equity funds used during construction	(3)		(2)
Provision for bad debts	2		2
Changes in operating assets and liabilities:
Accounts receivable	5		10
Accrued unbilled revenues	18		5
Inventories	(4)		(1)
Other current assets	(8)		(6)
Accounts payable	2		9
Net regulatory assets and liabilities	4		(47)
Other current liabilities	6		(2)
Pension and other employee benefit obligations	(1)		(5)
Other, net	(2)		2
Net cash provided by operating activities	158		94
Investing activities
Capital/construction expenditures	(155)		(111)
Net cash used in investing activities	(155)		(111)
Financing activities
(Repayments of) proceeds from short-term borrowings, net	(83)		(19)
Borrowings under utility money pool arrangement	471		186
Repayments under utility money pool arrangement	(404)		(153)
Capital contributions from parent	51		40
Dividends paid to parent	(48)		(38)
Other, net	—		1
Net cash (used in) provided by financing activities	(13)		17
Net change in cash, cash equivalents and restricted cash	(10)		—
Cash, cash equivalents and restricted cash at beginning of period	11		2
Cash, cash equivalents and restricted cash at end of period	$	1	$	2
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	$	(20)	$	(19)
Cash paid for income taxes, net	(17)		(13)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	$	23	$	19
Inventory transfers to property, plant and equipment	2		2
Allowance for equity funds used during construction	3		2

See Notes to Consolidated Financial Statements

5

NSP-WISCONSIN AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

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

	June 30, 2022		Dec. 31, 2021
Assets
Current assets
Cash and cash equivalents	$	1	$	11
Accounts receivable, net	73		71
Accrued unbilled revenues	50		69
Other receivables	12		3
Inventories	28		27
Regulatory assets	46		21
Prepaid taxes	26		25
Prepayments and other	5		7
Total current assets	241		234
Property, plant and equipment, net	2,752		2,660
Other assets
Regulatory assets	196		225
Other	5		4
Total other assets	201		229
Total assets	$	3,194	$	3,123
Liabilities and Equity
Current liabilities
Short-term debt	—		83
Borrowings under utility money pool arrangement	67		—
Accounts payable	62		69
Accounts payable to affiliates	19		23
Dividends payable to parent	19		26
Regulatory liabilities	15		4
Taxes accrued	13		10
Accrued interest	10		10
Other	23		21
Total current liabilities	228		246
Deferred credits and other liabilities
Deferred income taxes	329		325
Deferred investment tax credits	5		5
Regulatory liabilities	380		372
Customer advances	22		23
Pension and employee benefit obligations	14		16
Other	45		46
Total deferred credits and other liabilities	795		787
Commitments and contingencies
Capitalization
Long-term debt	987		987
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at June 30, 2022 and Dec. 31, 2021, respectively	93		93
Additional paid in capital	702		642
Retained earnings	389		368
Total common stockholder's equity	1,184		1,103
Total liabilities and equity	$	3,194	$	3,123

See Notes to Consolidated Financial Statements

6

NSP-WISCONSIN AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY (UNAUDITED)

(amounts in millions, except share data; shares in thousands)

	Common Stock Issued					Retained Earnings		Total Common Stockholder's Equity
	Shares	Par Value		Additional Paid In Capital
Three Months Ended June 30, 2022 and 2021
Balance at March 31, 2021	933	$	93	$	635	$	382	$	1,110
Net income						14		14
Common dividends declared to parent						(14)		(14)
Contribution of capital by parent				3				3
Balance at June 30, 2021	933	$	93	$	638	$	382	$	1,113
Balance at March 31, 2022	933	$	93	$	672	$	393	$	1,158
Net income						15		15
Common dividends declared to parent						(19)		(19)
Contribution of capital by parent				30				30
Balance at June 30, 2022	933	$	93	$	702	$	389	$	1,184

								Total Common Stockholder's Equity
	Common Stock Issued					Retained Earnings
	Shares	Par Value		Additional Paid In Capital
Six Months Ended June 30, 2022 and 2021
Balance at Dec. 31, 2020	933	$	93	$	605	$	370	$	1,068
Net income						46		46
Common dividends declared to parent						(34)		(34)
Contribution of capital by parent				33				33
Balance at June 30, 2021	933	$	93	$	638	$	382	$	1,113
Balance at Dec. 31, 2021	933	$	93	$	642	$	368	$	1,103
Net income						62		62
Common dividends declared to parent						(41)		(41)
Contribution of capital by parent				60				60
Balance at June 30, 2022	933	$	93	$	702	$	389	$	1,184
See Notes to Consolidated Financial Statements

7

NSP-WISCONSIN 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 NSP-Wisconsin and its subsidiaries as of June 30, 2022 and Dec. 31, 2021; the results of NSP-Wisconsin's operations, including the components of net income, changes in stockholder's equity and comprehensive income for the three and six months ended June 30, 2022 and 2021; and NSP-Wisconsin's cash flows for the six months ended June 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 June 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 NSP-Wisconsin 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 NSP-Wisconsin 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 NSP-Wisconsin’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 NSP-Wisconsin 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 June 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 NSP-Wisconsin's financial statements.

3. Selected Balance Sheet Data

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$	81	$	79
Less allowance for bad debts	(8)		(8)
Accounts receivable, net	$	73	$	71

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	8	$	8
Fuel	12		9
Natural gas	8		10
Total inventories	$	28	$	27

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	3,459	$	3,348
Natural gas plant	434		423
Common and other property	247		233
Construction work in progress	136		134
Total property, plant and equipment	4,276		4,138
Less accumulated depreciation	(1,524)		(1,478)
Property, plant and equipment, net	$	2,752	$	2,660

4. Borrowings and Other Financing Instruments

Short-Term Borrowings

NSP-Wisconsin 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 NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	150		$	150
Amount outstanding at period end	67			—
Average amount outstanding	48			16
Maximum amount outstanding	77			78
Weighted average interest rate, computed on a daily basis	0.82		%	0.05		%
Weighted average interest rate at period end	1.40			N/A

Commercial Paper — Commercial paper outstanding for NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	150		$	150
Amount outstanding at period end	—			83
Average amount outstanding	6			3
Maximum amount outstanding	50			83
Weighted average interest rate, computed on a daily basis	0.60		%	0.18		%
Weighted average interest rate at period end	N/A			0.21

Letters of Credit — NSP-Wisconsin uses letters of credit, generally with terms of one year, to provide financial guarantees for certain obligations. At both June 30, 2022 and Dec. 31, 2021, there were no letters of credit outstanding under the credit facility.

Revolving Credit Facility — In order to issue its commercial paper, NSP-Wisconsin 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.

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

8

As of June 30, 2022, NSP-Wisconsin had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Outstanding (b)		Available
$	150	$	—	$	150

(a)Expires in June 2024.

(b)Includes outstanding commercial paper.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility. NSP-Wisconsin had no direct advances on the credit facility outstanding at June 30, 2022 and Dec. 31, 2021.

Other Short-Term Borrowings — Clearwater Investments, Inc., a NSP-Wisconsin subsidiary, had an immaterial note payable to Xcel Energy Inc. as of June 30, 2022 and Dec. 31, 2021, respectively.

Long-Term Borrowings and Other Financing Instruments

On July 15, 2022, subsequent to the end of the quarter, NSP-Wisconsin priced a private placement of $100 million of 4.86% first mortgage bonds due September 15, 2052. The closing of the sale of the bonds is expected to occur on Sept. 12, 2022.

5. Revenues

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

	Three Months Ended June 30, 2022
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	67	$	18	$	85
C&I	119		15		134
Other	2		—		2
Total retail	188		33		221
Interchange	52		—		52
Other	1		1		2
Total revenue from contracts with customers	241		34		275
Alternative revenue and other	2		1		3
Total revenues	$	243	$	35	$	278

	Three Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	64	$	15	$	79
C&I	108		15		123
Other	2		—		2
Total retail	174		30		204
Interchange	46		—		46
Other	1		1		2
Total revenue from contracts with customers	221		31		252
Alternative revenue and other	3		—		3
Total revenues	$	224	$	31	$	255

	Six Months Ended June 30, 2022
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	148	$	60	$	208
C&I	235		49		284
Other	4		—		4
Total retail	387		109		496
Interchange	99		—		99
Other	2		2		4
Total revenue from contracts with customers	488		111		599
Alternative revenue and other	5		2		7
Total revenues	$	493	$	113	$	606

	Six Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	135	$	46	$	181
C&I	211		39		250
Other	3		—		3
Total retail	349		85		434
Interchange	92		—		92
Other	1		2		3
Total revenue from contracts with customers	442		87		529
Alternative revenue and other	6		1		7
Total revenues	$	448	$	88	$	536

6. Income Taxes

Reconciliation between the statutory rate and effective tax rate:

	Six Months Ended June 30
	2022		2021
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	6.2		6.2
Increases (decreases) in tax from:
Plant regulatory differences (a)	(4.0)		(5.4)
Tax credits	(0.8)		(1.3)
Other (net)	0.1		0.2
Effective income tax rate	22.5	%	20.7	%

(a)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.

9

7. Fair Value of Financial Assets and Liabilities

Fair Value Measurements

Accounting guidance for fair value measurements and disclosures provides a single definition of fair value and requires disclosures about assets and liabilities measured at fair value. A hierarchical framework for disclosing the observability of the inputs utilized in measuring assets and liabilities at fair value is established by this guidance.

•Level 1 — Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices.

•Level 2 — Pricing inputs are other than quoted prices in active markets, but are either directly or indirectly observable as of the reporting date. The types of assets and liabilities included in Level 2 are typically either comparable to actively traded securities or contracts, or priced with models using highly observable inputs.

•Level 3 — Significant inputs to pricing have little or no observability as of the reporting date. The types of assets and liabilities included in Level 3 are those valued with models requiring significant management judgment or estimation.

Specific valuation methods include:

Cash equivalents — The fair values of cash equivalents are generally based on cost plus accrued interest; money market funds are measured using quoted net asset value.

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

Commodity derivatives — 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

NSP-Wisconsin 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 and utility commodity prices.

Interest Rate Derivatives — NSP-Wisconsin may enter 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. As of June 30, 2022 and Dec. 31, 2021, NSP-Wisconsin had no unsettled interest rate derivatives.

Commodity Derivatives — NSP-Wisconsin may enter 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 natural gas to generate electric energy and natural gas for resale. At June 30, 2022 and Dec. 31, 2021, NSP-Wisconsin had no gross notional amounts of commodity options.

Consideration of Credit Risk and Concentrations — NSP-Wisconsin continuously monitors the creditworthiness of counterparties to its interest rate derivatives and commodity derivative contracts, prior to settlement, and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented on the consolidated balance sheets.

Impact of Derivative Activities on Income — Changes in the fair value of natural gas commodity derivatives resulted in immaterial losses and immaterial gains for the three and six months ended June 30, 2022, respectively. Changes in the fair value of natural gas commodity derivatives resulted in no gains or losses and $1 million in losses for the three and six months ended June 30, 2021, respectively, which were recognized as regulatory assets and liabilities. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms.

During the three months ended June 30, 2022 and 2021, there were no settlement gains or losses on natural gas commodity derivatives. During the six months ended June 30, 2022 and 2021, there were $1 million of settlement losses, respectively, which were recognized subject to purchased natural gas cost recovery mechanisms, which result in reclassifications of derivative settlement gains and losses out of income to a regulatory asset or liability, as appropriate.

NSP-Wisconsin had no derivative instruments designated as fair value hedges during the three and six months ended June 30, 2022 and 2021.

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

	June 30, 2022
	Fair Value						Fair Value Total		Netting (a)		Total (b)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	June 30, 2022
	Fair Value						Fair Value Total		Netting (a)		Total (c)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	Dec. 31, 2021
	Fair Value						Fair Value Total		Netting (a)		Total (b)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	Dec. 31, 2021
	Fair Value						Fair Value Total		Netting (a)		Total (c)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

(a)    NSP-Wisconsin nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2022 and Dec. 31, 2021. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

(b)    Included in prepayments and other current assets at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

(c)    Included in other current liabilities at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

Fair Value of Long-Term Debt

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

	June 30, 2022				Dec. 31, 2021
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	987	$	949	$	987	$	1,143

Fair value of NSP-Wisconsin’s long-term debt is estimated based on recent trades and observable spreads from benchmark interest rates for similar securities. Fair value estimates are based on information available to management as of June 30, 2022 and Dec. 31, 2021 and given the observability of the inputs, fair values presented for long-term debt were assigned as Level 2.

8. Benefit Plans and Other Postretirement Benefits

Components of Net Periodic Benefit Cost

	Three Months Ended June 30
	2022		2021
(Millions of Dollars)	Pension Benefits
Service cost	$	1	$	1
Interest cost (a)	1		1
Expected return on plan assets (a)	(2)		(2)
Amortization of net loss (a)	1		1
Net periodic benefit cost	$	1	$	1

	Six Months Ended June 30
	2022		2021
(Millions of Dollars)	Pension Benefits
Service cost	$	2	$	3
Interest cost (a)	2		2
Expected return on plan assets (a)	(4)		(4)
Amortization of net loss (a)	2		2
Net periodic benefit cost	$	2	$	3

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

In January 2022, contributions of $50 million were made across four of Xcel Energy’s pension plans, of which $1 million was attributable to NSP-Wisconsin. 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 NSP-Wisconsin’s financial position.

Legal

NSP-Wisconsin 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 NSP-Wisconsin’s consolidated financial statements. Legal fees are generally expensed as incurred.

11

Gas Trading Litigation — e prime is a wholly owned subsidiary of Xcel Energy. e prime was in the business of natural gas trading and marketing but has not engaged in natural gas trading or marketing activities since 2003. Multiple lawsuits involving multiple plaintiffs seeking monetary damages were commenced against e prime and its affiliates, including Xcel Energy, between 2003 and 2009 alleging fraud and anticompetitive activities in conspiring to restrain the trade of natural gas and manipulate natural gas prices. Cases were all consolidated in the U.S. District Court in Nevada.

One case remains active which includes a multi-district litigation matter consisting of a Wisconsin purported class (Arandell Corp.). The Court issued a ruling on June 30, 2022 granting plaintiffs’ class certification. Defendants will work together to prepare and file a petition appealing the class certification ruling to the Seventh Circuit. Xcel Energy has concluded that a loss is remote for the remaining lawsuit.

Rate Matters

NSP-Wisconsin 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.

MISO ROE Complaints — In November 2013 and February 2015, customer groups filed two ROE complaints against MISO TOs, which includes NSP-Minnesota and NSP-Wisconsin. The first complaint requested a reduction in base ROE transmission formula rates from 12.38% to 9.15% for the time period of Nov. 12, 2013 to Feb. 11, 2015, and removal of ROE adders (including those for Regional Transmission Organization membership). The second complaint requested, for a subsequent time period, a base ROE reduction from 12.38% to 8.67%.

The FERC has subsequently issued various related orders (including Opinion Nos. 569, 569A and 569B) related to ROE methodology/calculations and timing. NSP-Minnesota has recognized a liability for its best estimate of final refunds to customers for applicable complaint periods on behalf of the NSP System.

The MISO TOs and various other parties have filed petitions for review of the FERC’s most recent applicable opinions at the D.C. Circuit. A decision is expected by the end of the third quarter of 2022.

Environmental

MGP, Landfill and Disposal Sites

NSP-Wisconsin is investigating, remediating or performing post-closure actions at four MGP, landfill or other disposal sites across its service territories.

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

Environmental Requirements — Water and Waste

Federal Clean Water Act Section 316(b) — The federal Clean Water Act requires the EPA to regulate cooling water intake structures to assure that these structures reflect the best technology available for minimizing impingement and entrainment of aquatic species. NSP-Wisconsin estimates capital expenditures of approximately $4 million to comply with impingement and entrainment requirements. NSP-Wisconsin believes two plants could be required to make improvements to reduce impingement and entrainment. NSP-Wisconsin anticipates these costs will be recoverable through regulatory mechanisms.

10. Segment Information

NSP-Wisconsin 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.

NSP-Wisconsin has the following reportable segments:

•Regulated Electric — The regulated electric utility segment generates electricity, which is transmitted and distributed in Wisconsin and Michigan.

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

Asset and capital expenditure information is not provided for NSP-Wisconsin's reportable segments. As an integrated electric and natural gas utility, NSP-Wisconsin operates significant assets that are not dedicated to a specific business segment. Reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations, which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.

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

NSP-Wisconsin's segment information:

	Three Months Ended June 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues (a)	$	243	$	224
Net income	15		16
Regulated Natural Gas
Total revenues	$	35	$	31
Net income	(1)		(2)
All Other
Net income	$	1	$	—
Consolidated Total
Total revenues (a)	$	278	$	255
Net income	15		14

(a)Total revenues include $52 million and $46 million of affiliate electric revenue for the three months ended June 30, 2022 and 2021, respectively.

12

	Six Months Ended June 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues (a)	$	493	$	448
Net income	47		40
Regulated Natural Gas
Total revenues	$	113	$	88
Net income	14		6
All Other
Net income	$	1	$	—
Consolidated Total
Total revenues (a)	$	606	$	536
Net income	62		46

(a)Total revenues include $99 million and $92 million of affiliate electric revenue for the six months ended June 30, 2022 and 2021, respectively.

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

Discussion of financial condition and liquidity for NSP-Wisconsin 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 adjusts amounts that are adjusted from measures calculated and presented in accordance with GAAP.

NSP-Wisconsin’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 NSP-Wisconsin’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 NSP-Wisconsin. For the three and six months ended June 30, 2022 and 2021, there were no such adjustments to GAAP earnings and therefore GAAP earnings equal ongoing earnings.

Results of Operations

NSP-Wisconsin's net income was $62 million for the six months ended June 30, 2022, compared to $46 million for the prior year. The increase reflects the impact of regulatory rate outcomes, sales growth and favorable weather, partially offset by higher 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, coal and uranium. However, these price fluctuations generally have minimal impact on earnings impact due to fuel recovery mechanisms. In addition, electric customers receive a credit for production tax credits generated, which reduce electric revenue and income taxes.

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

	Six Months Ended June 30
(Millions of Dollars)	2022		2021
Electric revenues	$	493	$	448
Electric fuel and purchased power	(236)		(216)
Electric margin	$	257	$	232

(Millions of Dollars)	Six Months Ended June 30, 2022 vs. 2021
Regulatory rate outcomes	$	17
Sales and demand (a)	7
Other (net)	1
Total increase	$	25

(a) Sales increase excludes weather impact.

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:

	Six Months Ended June 30
(Millions of Dollars)	2022		2021
Natural gas revenues	$	113	$	88
Cost of natural gas sold and transported	(65)		(51)
Natural gas margin	$	48	$	37

(Millions of Dollars)	Six Months Ended June 30, 2022 vs. 2021
Regulatory rate outcomes (Wisconsin)	$	7
Estimated impact of weather	4
Natural gas sales and transport (excluding weather impact)	1
Other (net)	(1)
Total increase	$	11

Non-Fuel Operating Expenses and Other Items

O&M Expenses — O&M costs increased $8 million year-to-date, primarily due higher costs for storms and vegetation management, additional investments in technology and customer programs and interchange expenses, partially offset by a reduction in benefit costs.

13

Depreciation and Amortization — Depreciation and amortization increased $5 million year-to-date, primarily due to normal system expansion.

Income Taxes — Income tax expense increased $6 million for the first six months of 2022. The increase was primarily driven by higher pretax earnings in 2022.

See Note 6 to the consolidated financial statements for further information.

Public Utility Regulation and Other

The FERC and various state and local regulatory commissions regulate NSP-Wisconsin. The electric and natural gas rates charged to customers of NSP-Wisconsin are approved by the FERC or the regulatory commissions in the states in which it operates.

Rates are designed to recover plant investment, operating costs and an allowed return on investment. NSP-Wisconsin requests changes in utility rates through commission filings.

Changes in operating costs can affect NSP-Wisconsin’s financial results, depending on the timing of rate case filings and implementation of final rates. Other factors affecting rate filings are new investments, sales, conservation and 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 NSP-Wisconsin’s results of operations.

Except to the extent noted below, the circumstances set forth in Public Utility Regulation included in Item 7 of NSP-Wisconsin’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.

Pending Regulatory Proceeding

Michigan Natural Gas Rate Case — In July 2022, NSP-Wisconsin filed an application with the Public Service Commission of Michigan seeking a revenue increase in base natural gas rates of $1 million for the period of 2023-2025.

Other

Supply Chain

Xcel Energy’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. These disruptions have been further exacerbated by inflationary pressures, labor shortages and the impact of international conflicts/issues. Xcel Energy continues to monitor the availability of materials and has sought to mitigate impacts by seeking alternative suppliers as necessary.

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.

The uncertainty of the investigation and the adverse impact on potential tariffs has resulted in the cancellation or delay of certain domestic solar projects.

In June 2021, the PSCW approved NSP-Wisconsin’s Western Mustang solar project, a 74 megawatt facility that would be built by a developer for approximately $100 million. The project was originally scheduled to go into service in 2022. As a result of the disruption of the solar supply chain, the developer has indicated difficulty delivering the project at the contract price and scheduled in-service date. Negotiations on a potential solution are on-going.

MISO Capacity Credits

The NSP System offered 1,500 MW of excess capacity into the MISO planning resource auction for June 2022 through May 2023. Due to a projected overall capacity shortfall in the MISO region, the 1,500 MWs offered cleared the auction at maximum pricing and is expected to generate revenues to the NSP System of approximately $89 million in 2022 and approximately $64 million in 2023. During the second quarter of 2022, the NSP System received approximately $13 million of capacity credits.

NSP-Wisconsin's share of the 2022 capacity revenues is expected to be approximately $14 million. These revenues will offset fuel costs through existing fuel recovery mechanisms.

Environmental

Affordable Clean Energy

In July 2019, the EPA adopted the ACE rule, which requires states to develop plans by 2022 for greenhouse gas reductions from coal-fired power plants. In January 2021, the U.S. Court of Appeals for the D.C. Circuit issued a decision vacating and remanding the ACE rule. That decision essentially held that EPA’s previous economy-wide regulatory approach taken in the 2015 CPP was consistent with the Clean Air Act. If upheld, that decision would have allowed the EPA to proceed with alternate regulation of coal-fired power plants consistent with the CPP approach. However, the Court of Appeals decision was appealed to the U.S Supreme Court. In a June 30, 2022, ruling, the Supreme Court held that a CPP economy-wide approach is not consistent with the Clean Air Act. Thus, if EPA is to proceed with new rules, they must be consistent with this ruling and be more similar to the ACE rule “inside the fenceline” approach. If any new rules require additional investment, NSP-Wisconsin believes that the cost of these initiatives or replacement generation would be recoverable through rates based on prior state commission practices.

ITEM 4 — CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

NSP-Wisconsin maintains a set of disclosure controls and procedures designed to ensure that information required to be disclosed in reports that it files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms.

In addition, the disclosure controls and procedures ensure that information required to be disclosed is accumulated and communicated to management, including the CEO and CFO, allowing timely decisions regarding required disclosure.

As of June 30, 2022, based on an evaluation carried out under the supervision and with the participation of NSP-Wisconsin’s management, including the CEO and CFO, of the effectiveness of its disclosure controls and procedures, the CEO and CFO have concluded that NSP-Wisconsin’s disclosure controls and procedures were effective.

14

Internal Control Over Financial Reporting

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

PART II — OTHER INFORMATION

ITEM 1 — LEGAL PROCEEDINGS

NSP-Wisconsin 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 NSP-Wisconsin’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

NSP-Wisconsin'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 of NSP-Wisconsin, dated May 28, 1998	NSP-Wisconsin Form S-4 dated Jan. 21, 2004	3.01
3.02*	Amended and Restated Bylaws of NSP-Wisconsin, dated Jan. 25, 2019	NSP-Wisconsin Form 10-K for the year ended Dec. 31, 2018	3.02
31.01	Principal Executive Officer’s certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.02	Principal Financial Officer’s certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.01	Certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Schema
101.CAL	Inline XBRL Calculation
101.DEF	Inline XBRL Definition
101.LAB	Inline XBRL Label
101.PRE	Inline XBRL Presentation
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

15

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.

		Northern States Power Company (a Wisconsin corporation)
7/28/2022	By:	/s/ BRIAN J. VAN ABEL
		Brian J. Van Abel
		Executive Vice President, Chief Financial Officer
		(Duly Authorized Officer and Principal Financial Officer)

16

EX-31.01

Exhibit 31.01

CERTIFICATION

I, Robert C. Frenzel, certify that:

1.I have reviewed this report on Form 10-Q of Northern States Power Company (a Wisconsin corporation);

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: 7/28/2022

/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 Northern States Power Company (a Wisconsin corporation);

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: 7/28/2022

/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 Northern States Power Company, a Wisconsin Corporation (NSP-Wisconsin) on Form 10-Q for the quarter ended June 30, 2022, as filed with the SEC on the date hereof (Form 10-Q), each of the undersigned officers of NSP-Wisconsin 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 NSP-Wisconsin as of the dates and for the periods expressed in the Form 10-Q.

Date: 7/28/2022

/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 NSP-Wisconsin and will be retained by NSP-Wisconsin and furnished to the SEC or its staff upon request.

1

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Entity Registrant Name	NORTHERN STATES POWER CO /WI/
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Entity File Number	001-03140
Entity Incorporation, State or Country Code	WI
Entity Tax Identification Number	39-0508315
Entity Address, Address Line One	1414 West Hamilton Avenue
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Entity Address, State or Province	WI
Entity Address, Postal Zip Code	54701
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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating revenues
Electric, non-affiliates	$ 191	$ 178	$ 394	$ 356
Electric, affiliates	52	46	99	92
Natural gas	35	31	113	88
Total operating revenues	278	255	606	536
Operating expenses
Electric fuel and purchased power, non-affiliates	4	5	8	10
Purchased power, affiliates	120	106	228	206
Cost of natural sold and transported	20	20	65	51
O&M expenses	54	50	107	99
Conservation program expenses	3	3	6	6
Depreciation and amortization	40	36	78	73
Taxes (other than income taxes)	7	8	15	15
Total operating expenses	248	228	507	460
Operating income	30	27	99	76
Other expense, net	(1)	0	(1)	0
Allowance for funds used during construction — equity	1	1	3	2
Interest charges and financing costs
Interest charges, includes other financing costs of $1, $—, $1 and $—, respectively	11	12	22	21
Allowance for funds used during construction — debt	0	(1)	(1)	(1)
Total interest charges and financing costs	11	11	21	20
Income before income taxes	19	17	80	58
Income tax expense	4	3	18	12
Net income	$ 15	$ 14	$ 62	$ 46

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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net income	$ 62	$ 46
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	78	73
Deferred income taxes	(1)	10
Allowance for equity funds used during construction	3	2
Provision for bad debts	2	2
Changes in operating assets and liabilities:
Accounts receivable	5	10
Accrued unbilled revenues	18	5
Inventories	(4)	(1)
Other current assets	(8)	(6)
Accounts payable	2	9
Net regulatory assets and liabilities	4	(47)
Other current liabilities	6	(2)
Pension and other employee benefit obligations	(1)	(5)
Other, net	(2)	2
Net cash provided by operating activities	158	94
Investing activities
Capital/construction expenditures	(155)	(111)
Net cash used in investing activities	(155)	(111)
Financing activities
(Repayments of) proceeds from short-term borrowings, net	(83)	(19)
Borrowings under utility money pool arrangement	471	186
Repayments under utility money pool arrangement	(404)	(153)
Capital contributions from parent	51	40
Dividends paid to parent	(48)	(38)
Other, net	0	1
Net cash (used in) provided by financing activities	(13)	17
Net change in cash, cash equivalents and restricted cash	(10)	0
Cash, cash equivalents and restricted cash at beginning of period	11	2
Cash, cash equivalents and restricted cash at end of period	1	2
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(20)	(19)
Cash paid for income taxes, net	(17)	(13)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	23	19
Inventory transfers to property, plant and equipment	2	2
Allowance for equity funds used during construction	$ 3	$ 2

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CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 1	$ 11
Accounts receivable, net	73	71
Accrued unbilled revenues	50	69
Other receivables	12	3
Inventories	28	27
Regulatory assets	46	21
Prepaid taxes	26	25
Prepayments and other	5	7
Total current assets	241	234
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, net	2,752	2,660
Other assets
Regulatory assets	196	225
Other	5	4
Total other assets	201	229
Total assets	3,194	3,123
Current liabilities
Short-term debt	0	83
Borrowings under utility money pool arrangement	67	0
Accounts payable	62	69
Accounts payable to affiliates	19	23
Dividends payable to parent	19	26
Regulatory liabilities	15	4
Taxes accrued	13	10
Accrued interest	10	10
Other	23	21
Total current liabilities	228	246
Deferred credits and other liabilities
Deferred income taxes	329	325
Deferred investment tax credits	5	5
Regulatory liabilities	380	372
Customer advances	22	23
Pension and employee benefit obligations	14	16
Other	45	46
Total deferred credits and other liabilities	795	787
Commitments and contingencies
Capitalization
Long-term debt	987	987
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at June 30, 2022 and Dec. 31, 2021, respectively	$ 93	$ 93
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, par value (in dollars per share)	$ 100	$ 100
Common stock, shares outstanding (in shares)	933,000	933,000
Additional paid in capital	$ 702	$ 642
Retained earnings	389	368
Total common stockholder's equity	1,184	1,103
Total liabilities and equity	$ 3,194	$ 3,123

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CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings
Balance (in shares) at Dec. 31, 2020		933,000
Beginning Balance at Dec. 31, 2020	$ 1,068	$ 93	$ 605	$ 370
Increase (Decrease) in Stockholder's Equity
Net income	46
Common dividends declared to parent	(34)			(34)
Contribution of capital by parent	33		33
Balance (in shares) at Jun. 30, 2021		933,000
Ending Balance at Jun. 30, 2021	1,113	$ 93	638	382
Balance (in shares) at Mar. 31, 2021		933,000
Beginning Balance at Mar. 31, 2021	1,110	$ 93	635	382
Increase (Decrease) in Stockholder's Equity
Net income	14			14
Common dividends declared to parent	(14)			(14)
Contribution of capital by parent	3		3
Balance (in shares) at Jun. 30, 2021		933,000
Ending Balance at Jun. 30, 2021	$ 1,113	$ 93	638	382
Balance (in shares) at Dec. 31, 2021	933,000	933,000
Beginning Balance at Dec. 31, 2021	$ 1,103	$ 93	642	368
Increase (Decrease) in Stockholder's Equity
Net income	62
Common dividends declared to parent	(41)			(41)
Contribution of capital by parent	$ 60		60
Balance (in shares) at Jun. 30, 2022	933,000	933,000
Ending Balance at Jun. 30, 2022	$ 1,184	$ 93	702	389
Balance (in shares) at Mar. 31, 2022		933,000
Beginning Balance at Mar. 31, 2022	1,158	$ 93	672	393
Increase (Decrease) in Stockholder's Equity
Net income	15			15
Common dividends declared to parent	(19)			(19)
Contribution of capital by parent	$ 30		30
Balance (in shares) at Jun. 30, 2022	933,000	933,000
Ending Balance at Jun. 30, 2022	$ 1,184	$ 93	$ 702	$ 389

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Management's Opinion

6 Months Ended

Jun. 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 NSP-Wisconsin and its subsidiaries as of June 30, 2022 and Dec. 31, 2021; the results of NSP-Wisconsin's operations, including the components of net income, changes in stockholder's equity and comprehensive income for the three and six months ended June 30, 2022 and 2021; and NSP-Wisconsin's cash flows for the six months ended June 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 June 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 NSP-Wisconsin 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 NSP-Wisconsin 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 NSP-Wisconsin’s electric and natural gas sales, interim results are not necessarily an appropriate base from which to project annual results.

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Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 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 NSP-Wisconsin 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	6 Months Ended
	Jun. 30, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Pronouncements	As of June 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 NSP-Wisconsin's financial statements.

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Selected Balance Sheet Data

6 Months Ended

Jun. 30, 2022

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$	81	$	79
Less allowance for bad debts	(8)		(8)
Accounts receivable, net	$	73	$	71

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	8	$	8
Fuel	12		9
Natural gas	8		10
Total inventories	$	28	$	27

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	3,459	$	3,348
Natural gas plant	434		423
Common and other property	247		233
Construction work in progress	136		134
Total property, plant and equipment	4,276		4,138
Less accumulated depreciation	(1,524)		(1,478)
Property, plant and equipment, net	$	2,752	$	2,660

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Borrowings and Other Financing Instruments

6 Months Ended

Jun. 30, 2022

Debt Disclosure [Abstract]

Borrowings and Other Financing Instruments

Short-Term Borrowings

NSP-Wisconsin 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 NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	150		$	150
Amount outstanding at period end	67			—
Average amount outstanding	48			16
Maximum amount outstanding	77			78
Weighted average interest rate, computed on a daily basis	0.82		%	0.05		%
Weighted average interest rate at period end	1.40			N/A

Commercial Paper — Commercial paper outstanding for NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	150		$	150
Amount outstanding at period end	—			83
Average amount outstanding	6			3
Maximum amount outstanding	50			83
Weighted average interest rate, computed on a daily basis	0.60		%	0.18		%
Weighted average interest rate at period end	N/A			0.21

Letters of Credit — NSP-Wisconsin uses letters of credit, generally with terms of one year, to provide financial guarantees for certain obligations. At both June 30, 2022 and Dec. 31, 2021, there were no letters of credit outstanding under the credit facility.

Revolving Credit Facility — In order to issue its commercial paper, NSP-Wisconsin 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.

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

As of June 30, 2022, NSP-Wisconsin had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Outstanding (b)		Available
$	150	$	—	$	150

(a)Expires in June 2024.

(b)Includes outstanding commercial paper.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility. NSP-Wisconsin had no direct advances on the credit facility outstanding at June 30, 2022 and Dec. 31, 2021.

Other Short-Term Borrowings — Clearwater Investments, Inc., a NSP-Wisconsin subsidiary, had an immaterial note payable to Xcel Energy Inc. as of June 30, 2022 and Dec. 31, 2021, respectively.

Long-Term Borrowings and Other Financing Instruments

On July 15, 2022, subsequent to the end of the quarter, NSP-Wisconsin priced a private placement of $100 million of 4.86% first mortgage bonds due September 15, 2052. The closing of the sale of the bonds is expected to occur on Sept. 12, 2022.

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Revenues

6 Months Ended

Jun. 30, 2022

Revenue from Contract with Customer [Abstract]

Revenues

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

	Three Months Ended June 30, 2022
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	67	$	18	$	85
C&I	119		15		134
Other	2		—		2
Total retail	188		33		221
Interchange	52		—		52
Other	1		1		2
Total revenue from contracts with customers	241		34		275
Alternative revenue and other	2		1		3
Total revenues	$	243	$	35	$	278

	Three Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	64	$	15	$	79
C&I	108		15		123
Other	2		—		2
Total retail	174		30		204
Interchange	46		—		46
Other	1		1		2
Total revenue from contracts with customers	221		31		252
Alternative revenue and other	3		—		3
Total revenues	$	224	$	31	$	255

	Six Months Ended June 30, 2022
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	148	$	60	$	208
C&I	235		49		284
Other	4		—		4
Total retail	387		109		496
Interchange	99		—		99
Other	2		2		4
Total revenue from contracts with customers	488		111		599
Alternative revenue and other	5		2		7
Total revenues	$	493	$	113	$	606

	Six Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	135	$	46	$	181
C&I	211		39		250
Other	3		—		3
Total retail	349		85		434
Interchange	92		—		92
Other	1		2		3
Total revenue from contracts with customers	442		87		529
Alternative revenue and other	6		1		7
Total revenues	$	448	$	88	$	536

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Income Taxes

6 Months Ended

Jun. 30, 2022

Income Tax Disclosure [Abstract]

Income Taxes

6. Income Taxes

Reconciliation between the statutory rate and effective tax rate:

	Six Months Ended June 30
	2022		2021
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	6.2		6.2
Increases (decreases) in tax from:
Plant regulatory differences (a)	(4.0)		(5.4)
Tax credits	(0.8)		(1.3)
Other (net)	0.1		0.2
Effective income tax rate	22.5	%	20.7	%

(a)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

6 Months Ended

Jun. 30, 2022

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities

7. Fair Value of Financial Assets and Liabilities

Fair Value Measurements

Accounting guidance for fair value measurements and disclosures provides a single definition of fair value and requires disclosures about assets and liabilities measured at fair value. A hierarchical framework for disclosing the observability of the inputs utilized in measuring assets and liabilities at fair value is established by this guidance.

•Level 1 — Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices.

•Level 2 — Pricing inputs are other than quoted prices in active markets, but are either directly or indirectly observable as of the reporting date. The types of assets and liabilities included in Level 2 are typically either comparable to actively traded securities or contracts, or priced with models using highly observable inputs.

•Level 3 — Significant inputs to pricing have little or no observability as of the reporting date. The types of assets and liabilities included in Level 3 are those valued with models requiring significant management judgment or estimation.

Specific valuation methods include:

Cash equivalents — The fair values of cash equivalents are generally based on cost plus accrued interest; money market funds are measured using quoted net asset value.

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

Commodity derivatives — 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

NSP-Wisconsin 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 and utility commodity prices.

Interest Rate Derivatives — NSP-Wisconsin may enter 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. As of June 30, 2022 and Dec. 31, 2021, NSP-Wisconsin had no unsettled interest rate derivatives.

Commodity Derivatives — NSP-Wisconsin may enter 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 natural gas to generate electric energy and natural gas for resale. At June 30, 2022 and Dec. 31, 2021, NSP-Wisconsin had no gross notional amounts of commodity options.

Consideration of Credit Risk and Concentrations — NSP-Wisconsin continuously monitors the creditworthiness of counterparties to its interest rate derivatives and commodity derivative contracts, prior to settlement, and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented on the consolidated balance sheets.

Impact of Derivative Activities on Income — Changes in the fair value of natural gas commodity derivatives resulted in immaterial losses and immaterial gains for the three and six months ended June 30, 2022, respectively. Changes in the fair value of natural gas commodity derivatives resulted in no gains or losses and $1 million in losses for the three and six months ended June 30, 2021, respectively, which were recognized as regulatory assets and liabilities. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms.

During the three months ended June 30, 2022 and 2021, there were no settlement gains or losses on natural gas commodity derivatives. During the six months ended June 30, 2022 and 2021, there were $1 million of settlement losses, respectively, which were recognized subject to purchased natural gas cost recovery mechanisms, which result in reclassifications of derivative settlement gains and losses out of income to a regulatory asset or liability, as appropriate.

NSP-Wisconsin had no derivative instruments designated as fair value hedges during the three and six months ended June 30, 2022 and 2021.

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

	June 30, 2022
	Fair Value						Fair Value Total		Netting (a)		Total (b)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	June 30, 2022
	Fair Value						Fair Value Total		Netting (a)		Total (c)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	Dec. 31, 2021
	Fair Value						Fair Value Total		Netting (a)		Total (b)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	Dec. 31, 2021
	Fair Value						Fair Value Total		Netting (a)		Total (c)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

(a)    NSP-Wisconsin nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2022 and Dec. 31, 2021. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

(b)    Included in prepayments and other current assets at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

(c)    Included in other current liabilities at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

Fair Value of Long-Term Debt

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

	June 30, 2022				Dec. 31, 2021
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	987	$	949	$	987	$	1,143

Fair value of NSP-Wisconsin’s long-term debt is estimated based on recent trades and observable spreads from benchmark interest rates for similar securities. Fair value estimates are based on information available to management as of June 30, 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

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Benefit Plans and Other Postretirement Benefits

Components of Net Periodic Benefit Cost

	Three Months Ended June 30
	2022		2021
(Millions of Dollars)	Pension Benefits
Service cost	$	1	$	1
Interest cost (a)	1		1
Expected return on plan assets (a)	(2)		(2)
Amortization of net loss (a)	1		1
Net periodic benefit cost	$	1	$	1

	Six Months Ended June 30
	2022		2021
(Millions of Dollars)	Pension Benefits
Service cost	$	2	$	3
Interest cost (a)	2		2
Expected return on plan assets (a)	(4)		(4)
Amortization of net loss (a)	2		2
Net periodic benefit cost	$	2	$	3

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

In January 2022, contributions of $50 million were made across four of Xcel Energy’s pension plans, of which $1 million was attributable to NSP-Wisconsin. Xcel Energy does not expect additional pension contributions during 2022.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

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

Legal

NSP-Wisconsin 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 NSP-Wisconsin’s consolidated financial statements. Legal fees are generally expensed as incurred.

Gas Trading Litigation — e prime is a wholly owned subsidiary of Xcel Energy. e prime was in the business of natural gas trading and marketing but has not engaged in natural gas trading or marketing activities since 2003. Multiple lawsuits involving multiple plaintiffs seeking monetary damages were commenced against e prime and its affiliates, including Xcel Energy, between 2003 and 2009 alleging fraud and anticompetitive activities in conspiring to restrain the trade of natural gas and manipulate natural gas prices. Cases were all consolidated in the U.S. District Court in Nevada.

One case remains active which includes a multi-district litigation matter consisting of a Wisconsin purported class (Arandell Corp.). The Court issued a ruling on June 30, 2022 granting plaintiffs’ class certification. Defendants will work together to prepare and file a petition appealing the class certification ruling to the Seventh Circuit. Xcel Energy has concluded that a loss is remote for the remaining lawsuit.

Rate Matters

NSP-Wisconsin 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.

MISO ROE Complaints — In November 2013 and February 2015, customer groups filed two ROE complaints against MISO TOs, which includes NSP-Minnesota and NSP-Wisconsin. The first complaint requested a reduction in base ROE transmission formula rates from 12.38% to 9.15% for the time period of Nov. 12, 2013 to Feb. 11, 2015, and removal of ROE adders (including those for Regional Transmission Organization membership). The second complaint requested, for a subsequent time period, a base ROE reduction from 12.38% to 8.67%.

The FERC has subsequently issued various related orders (including Opinion Nos. 569, 569A and 569B) related to ROE methodology/calculations and timing. NSP-Minnesota has recognized a liability for its best estimate of final refunds to customers for applicable complaint periods on behalf of the NSP System.

The MISO TOs and various other parties have filed petitions for review of the FERC’s most recent applicable opinions at the D.C. Circuit. A decision is expected by the end of the third quarter of 2022.

Environmental

MGP, Landfill and Disposal Sites

NSP-Wisconsin is investigating, remediating or performing post-closure actions at four MGP, landfill or other disposal sites across its service territories.

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

Environmental Requirements — Water and Waste

Federal Clean Water Act Section 316(b) — The federal Clean Water Act requires the EPA to regulate cooling water intake structures to assure that these structures reflect the best technology available for minimizing impingement and entrainment of aquatic species. NSP-Wisconsin estimates capital expenditures of approximately $4 million to comply with impingement and entrainment requirements. NSP-Wisconsin believes two plants could be required to make improvements to reduce impingement and entrainment. NSP-Wisconsin anticipates these costs will be recoverable through regulatory mechanisms.

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Segment Information

6 Months Ended

Jun. 30, 2022

Segment Reporting [Abstract]

Segment Information

NSP-Wisconsin 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.

NSP-Wisconsin has the following reportable segments:

•Regulated Electric — The regulated electric utility segment generates electricity, which is transmitted and distributed in Wisconsin and Michigan.

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

Asset and capital expenditure information is not provided for NSP-Wisconsin's reportable segments. As an integrated electric and natural gas utility, NSP-Wisconsin operates significant assets that are not dedicated to a specific business segment. Reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations, which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.

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

NSP-Wisconsin's segment information:

	Three Months Ended June 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues (a)	$	243	$	224
Net income	15		16
Regulated Natural Gas
Total revenues	$	35	$	31
Net income	(1)		(2)
All Other
Net income	$	1	$	—
Consolidated Total
Total revenues (a)	$	278	$	255
Net income	15		14

(a)Total revenues include $52 million and $46 million of affiliate electric revenue for the three months ended June 30, 2022 and 2021, respectively.

	Six Months Ended June 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues (a)	$	493	$	448
Net income	47		40
Regulated Natural Gas
Total revenues	$	113	$	88
Net income	14		6
All Other
Net income	$	1	$	—
Consolidated Total
Total revenues (a)	$	606	$	536
Net income	62		46

(a)Total revenues include $99 million and $92 million of affiliate electric revenue for the six months ended June 30, 2022 and 2021, respectively

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Selected Balance Sheet Data (Tables)

6 Months Ended

Jun. 30, 2022

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$	81	$	79
Less allowance for bad debts	(8)		(8)
Accounts receivable, net	$	73	$	71

Inventories

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	8	$	8
Fuel	12		9
Natural gas	8		10
Total inventories	$	28	$	27

Property, Plant and Equipment, Net

(Millions of dollars)	June 30, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	3,459	$	3,348
Natural gas plant	434		423
Common and other property	247		233
Construction work in progress	136		134
Total property, plant and equipment	4,276		4,138
Less accumulated depreciation	(1,524)		(1,478)
Property, plant and equipment, net	$	2,752	$	2,660

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Borrowings and Other Financing Instruments (Tables)

6 Months Ended

Jun. 30, 2022

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of June 30, 2022, NSP-Wisconsin had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Outstanding (b)		Available
$	150	$	—	$	150

(a)Expires in June 2024.

(b)Includes outstanding commercial paper.

Money Pool

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Money pool borrowings for NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	150		$	150
Amount outstanding at period end	67			—
Average amount outstanding	48			16
Maximum amount outstanding	77			78
Weighted average interest rate, computed on a daily basis	0.82		%	0.05		%
Weighted average interest rate at period end	1.40			N/A

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding for NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2022			Year Ended Dec. 31, 2021
Borrowing limit	$	150		$	150
Amount outstanding at period end	—			83
Average amount outstanding	6			3
Maximum amount outstanding	50			83
Weighted average interest rate, computed on a daily basis	0.60		%	0.18		%
Weighted average interest rate at period end	N/A			0.21

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Revenues (Tables)

6 Months Ended

Jun. 30, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

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

	Three Months Ended June 30, 2022
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	67	$	18	$	85
C&I	119		15		134
Other	2		—		2
Total retail	188		33		221
Interchange	52		—		52
Other	1		1		2
Total revenue from contracts with customers	241		34		275
Alternative revenue and other	2		1		3
Total revenues	$	243	$	35	$	278

	Three Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	64	$	15	$	79
C&I	108		15		123
Other	2		—		2
Total retail	174		30		204
Interchange	46		—		46
Other	1		1		2
Total revenue from contracts with customers	221		31		252
Alternative revenue and other	3		—		3
Total revenues	$	224	$	31	$	255

	Six Months Ended June 30, 2022
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	148	$	60	$	208
C&I	235		49		284
Other	4		—		4
Total retail	387		109		496
Interchange	99		—		99
Other	2		2		4
Total revenue from contracts with customers	488		111		599
Alternative revenue and other	5		2		7
Total revenues	$	493	$	113	$	606

	Six Months Ended June 30, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	135	$	46	$	181
C&I	211		39		250
Other	3		—		3
Total retail	349		85		434
Interchange	92		—		92
Other	1		2		3
Total revenue from contracts with customers	442		87		529
Alternative revenue and other	6		1		7
Total revenues	$	448	$	88	$	536

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2022

Income Tax Disclosure [Abstract]

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

Reconciliation between the statutory rate and effective tax rate:

	Six Months Ended June 30
	2022		2021
Federal statutory rate	21.0	%	21.0	%
State tax (net of federal tax effect)	6.2		6.2
Increases (decreases) in tax from:
Plant regulatory differences (a)	(4.0)		(5.4)
Tax credits	(0.8)		(1.3)
Other (net)	0.1		0.2
Effective income tax rate	22.5	%	20.7	%

(a)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)

6 Months Ended

Jun. 30, 2022

Fair Value Disclosures [Abstract]

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

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

	June 30, 2022
	Fair Value						Fair Value Total		Netting (a)		Total (b)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	June 30, 2022
	Fair Value						Fair Value Total		Netting (a)		Total (c)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	Dec. 31, 2021
	Fair Value						Fair Value Total		Netting (a)		Total (b)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

	Dec. 31, 2021
	Fair Value						Fair Value Total		Netting (a)		Total (c)
(Millions of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Natural gas commodity	$	—	$	1	$	—	$	1	$	—	$	1

(a)    NSP-Wisconsin nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2022 and Dec. 31, 2021. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

(b)    Included in prepayments and other current assets at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

(c)    Included in other current liabilities at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

Carrying Amount and Fair Value of Long-term Debt

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

	June 30, 2022				Dec. 31, 2021
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	987	$	949	$	987	$	1,143

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Benefit Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

Components of Net Periodic Benefit Cost

	Three Months Ended June 30
	2022		2021
(Millions of Dollars)	Pension Benefits
Service cost	$	1	$	1
Interest cost (a)	1		1
Expected return on plan assets (a)	(2)		(2)
Amortization of net loss (a)	1		1
Net periodic benefit cost	$	1	$	1

	Six Months Ended June 30
	2022		2021
(Millions of Dollars)	Pension Benefits
Service cost	$	2	$	3
Interest cost (a)	2		2
Expected return on plan assets (a)	(4)		(4)
Amortization of net loss (a)	2		2
Net periodic benefit cost	$	2	$	3

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

In January 2022, contributions of $50 million were made across four of Xcel Energy’s pension plans, of which $1 million was attributable to NSP-Wisconsin. Xcel Energy does not expect additional pension contributions during 2022.

^[1]

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

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Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2022

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

NSP-Wisconsin's segment information:

	Three Months Ended June 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues (a)	$	243	$	224
Net income	15		16
Regulated Natural Gas
Total revenues	$	35	$	31
Net income	(1)		(2)
All Other
Net income	$	1	$	—
Consolidated Total
Total revenues (a)	$	278	$	255
Net income	15		14

(a)Total revenues include $52 million and $46 million of affiliate electric revenue for the three months ended June 30, 2022 and 2021, respectively.

	Six Months Ended June 30
(Millions of Dollars)	2022		2021
Regulated Electric
Total revenues (a)	$	493	$	448
Net income	47		40
Regulated Natural Gas
Total revenues	$	113	$	88
Net income	14		6
All Other
Net income	$	1	$	—
Consolidated Total
Total revenues (a)	$	606	$	536
Net income	62		46

(a)Total revenues include $99 million and $92 million of affiliate electric revenue for the six months ended June 30, 2022 and 2021, respectively.

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Selected Balance Sheet Data - Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Accounts Receivable, Net
Accounts receivable	$ 81	$ 79
Less allowance for bad debts	(8)	(8)
Accounts receivable, net	$ 73	$ 71

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Selected Balance Sheet Data - Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Inventory [Line Items]
Total Inventories	$ 28	$ 27
Materials and supplies
Inventory [Line Items]
Inventories	8	8
Fuel
Inventory [Line Items]
Inventories	12	9
Natural gas
Inventory [Line Items]
Inventories	$ 8	$ 10

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Selected Balance Sheet Data - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 4,276	$ 4,138
Less accumulated depreciation	(1,524)	(1,478)
Property, plant and equipment, net	2,752	2,660
Electric plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,459	3,348
Natural gas plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	434	423
Common and other property
Public Utility, Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	247	233
Construction work in progress
Public Utility, Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 136	$ 134

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Borrowings and Other Financing Instruments, Commercial Paper (Details) - USD ($)		3 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Amount outstanding at period end		$ 0		$ 83,000,000
Credit Facility
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	150,000,000
Long-term Line of Credit		0		0
Payable to Affiliates
Short-term Debt [Line Items]
Notes Payable, Related Parties, Current		0		0
Commercial Paper
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		150,000,000		150,000,000
Amount outstanding at period end		0		$ 83,000,000
Average amount outstanding		6,000,000	$ 3,000,000
Maximum amount outstanding		$ 50,000,000	$ 83,000,000
Weighted average interest rate, computed on a daily basis		0.60%	0.18%
Weighted average interest rate at period end				0.21%
Money Pool
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 150,000,000		$ 150,000,000
Amount outstanding at period end		67,000,000		$ 0
Average amount outstanding		48,000,000	$ 16,000,000
Maximum amount outstanding		$ 77,000,000	$ 78,000,000
Weighted average interest rate, computed on a daily basis		0.82%	0.05%
Weighted average interest rate at period end		1.40%

[1] Expires in June 2024.

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Borrowings and Other Financing Instruments, Letters of Credit (Details) - USD ($)	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Period	1 year
Amount outstanding at period end	$ 0	$ 83,000,000
Credit Facility
Line of Credit Facility [Line Items]
Long-term Line of Credit	$ 0	$ 0

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Borrowings and Other Financing Instruments, Credit Facility (Details) - Credit Facility - USD ($)		Jun. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Credit Facility	[1]	$ 150,000,000
Outstanding	[2]	0
Available		150,000,000
Direct advances on the credit facility outstanding		$ 0	$ 0

[1] Expires in June 2024.

[2] Includes outstanding commercial paper.

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Borrowings and Other Financing Instruments (Details) - USD ($) $ in Millions	Jul. 15, 2022	Jun. 30, 2022	Dec. 31, 2021
Series Due September 15, 2052 | Bonds [Member] | Subsequent Event
Short-term Debt [Line Items]
Debt Instrument, Face Amount	$ 100.0
Debt Instrument, Interest Rate, Stated Percentage	4.86%
Payable to Affiliates
Short-term Debt [Line Items]
Notes Payable, Related Parties, Current		$ 0.0	$ 0.0

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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 278	$ 255	$ 606	$ 536
Regulated Electric | Total revenues
Disaggregation of Revenue [Line Items]
Total revenues	243	224	493	448
Regulated Natural Gas | Total revenues
Disaggregation of Revenue [Line Items]
Total revenues	35	31	113	88
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	221	204	496	434
Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	85	79	208	181
Retail | C&I
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	134	123	284	250
Retail | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	2	4	3
Retail | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	188	174	387	349
Retail | Regulated Electric | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	67	64	148	135
Retail | Regulated Electric | C&I
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	119	108	235	211
Retail | Regulated Electric | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	2	4	3
Retail | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33	30	109	85
Retail | Regulated Natural Gas | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18	15	60	46
Retail | Regulated Natural Gas | C&I
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15	15	49	39
Retail | Regulated Natural Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Interchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	46	99	92
Interchange | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	46	99	92
Interchange | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	2	4	3
Other | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	1	2	1
Other | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	1	2	2
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	275	252	599	529
Total revenue from contracts with customers | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	241	221	488	442
Total revenue from contracts with customers | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34	31	111	87
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	3	3	7	7
Alternative revenue and other | Regulated Electric
Disaggregation of Revenue [Line Items]
Alternative revenue and other	2	3	5	6
Alternative revenue and other | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Alternative revenue and other	$ 1	$ 0	$ 2	$ 1

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Income Taxes (Details)		6 Months Ended
		Jun. 30, 2022	Jun. 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		6.20%	6.20%
Effective Income Tax Rate Reconciliation, Other Regulatory Items, Percent	[1]	(4.00%)	(5.40%)
Regulatory difference - tax credits and tax credit and NOL allowances (net)		(0.80%)	(1.30%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent		0.10%	0.20%
Effective Income Tax Rate Reconciliation, Percent		22.50%	20.70%

[1] 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) - USD ($) $ in Millions		Jun. 30, 2022		Dec. 31, 2021
Interest Rate Swap
Derivative [Line Items]
Derivative Liability, Notional Amount		$ 0		$ 0
Natural Gas Commodity | Other Derivative Instruments | Other Current Assets | Fair Value, Recurring [Member]
Derivative [Line Items]
Derivative Asset, Gross		1		1
Netting	[1]	0		0
Derivative Asset, Net	[3]	1	[2]	1
Natural Gas Commodity | Other Derivative Instruments | Other Current Assets | Level 1 | Fair Value, Recurring [Member]
Derivative [Line Items]
Derivative Asset, Gross		0		0
Natural Gas Commodity | Other Derivative Instruments | Other Current Assets | Level 2 | Fair Value, Recurring [Member]
Derivative [Line Items]
Derivative Asset, Gross		1		1
Natural Gas Commodity | Other Derivative Instruments | Other Current Assets | Level 3 | Fair Value, Recurring [Member]
Derivative [Line Items]
Derivative Asset, Gross		$ 0		$ 0

[1] NSP-Wisconsin nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2022 and Dec. 31, 2021. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

[2] Included in other current liabilities at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

[3] Included in prepayments and other current assets at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

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Fair Value of Financial Assets and Liabilities - Impact of Derivative Activities on Income (Details) MMBTU in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) MMBTU	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) MMBTU	Jun. 30, 2021 USD ($)	Dec. 31, 2021 MMBTU
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments designated as fair value hedges	$ 0	$ 0	$ 0	$ 0
Financial Impact of Qualifying Fair Value Hedges on Earnings [Abstract]
Derivative instruments designated as fair value hedges	$ 0	0	$ 0	0
Natural Gas Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU	0		0		0
Other Derivative Instruments | Natural Gas Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)	$ 0	0	$ (1)	(1)
Other Derivative Instruments | Electric Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		$ 0		$ 1

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Fair Value of Financial Assets and Liabilities - Commodity Derivatives (Details) - MMBTU MMBTU in Millions	Jun. 30, 2022	Dec. 31, 2021
Natural Gas Commodity [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0	0

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Fair Value of Financial Assets and Liabilities - Recurring Fair Value Measurements (Details) MMBTU in Millions, $ in Millions		Jun. 30, 2022 USD ($) MMBTU		Dec. 31, 2021 USD ($) MMBTU
Derivatives, Fair Value [Line Items]
Prepayments and other		$ 5		$ 7
Natural Gas Commodity [Member]
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU		0		0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		$ 1		$ 1
Netting	[1]	0		0
Derivative Asset, Net	[3]	1	[2]	1
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity | Level 1
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		0		0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity | Level 2
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		1		1
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity | Level 3
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross		$ 0		0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability				1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]			0
Derivative Liability	[2]			1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity | Level 1
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability				0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity | Level 2
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability				1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity | Level 3
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability				$ 0

[1] NSP-Wisconsin nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2022 and Dec. 31, 2021. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

[2] Included in other current liabilities at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

[3] Included in prepayments and other current assets at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.

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Fair Value of Financial Assets and Liabilities - Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Amount	$ 987	$ 987
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 949	$ 1,143

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Benefit Plans and Other Postretirement Benefits (Details) - Pension Plan [Member] $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
		Jan. 31, 2022 USD ($) Plan	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Components of Net Periodic Benefit Cost [Abstract]
Service cost			$ 1	$ 1	$ 2	$ 3
Interest cost (a)	[1]		1	1	2	2
Expected return on plan assets (a)	[1]		(2)	(2)	(4)	(4)
Amortization of net loss (a)	[1]		1	1	2	2
Net periodic benefit cost			$ 1	$ 1	$ 2	$ 3
Contributions to pension plans		$ 1
Parent Company [Member]
Components of Net Periodic Benefit Cost [Abstract]
Contributions to pension plans		$ 50
Number of Xcel Energy's pension plans to which contributions were made | Plan		4

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

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Commitments and Contingencies Gas Trading Litigation (Details)	Oct. 25, 2021 USD ($)
Loss Contingencies [Line Items]
Active gas litigation cases	$ 1

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MISO ROE Complaints (Details) - Federal Energy Regulatory Commission (FERC) - FERC Proceeding, MISO ROE Complaint - NSP Minnesota and NSP Wisconsin [Member] [Member]	1 Months Ended
	Feb. 28, 2015	Nov. 30, 2013
Rate Matters [Abstract]
Public Utilities, Base Return On Equity Charged To Customers Through Transmission Formula Rates	12.38%	12.38%
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, Recommended By Third Parties	8.67%	9.15%

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Commitments and Contingencies (Details) - Enviromental Requirements	Jun. 30, 2022 USD ($)
Loss Contingencies [Line Items]
Liability for estimated cost to comply with regulation	$ 4,000,000
Gain Contingencies [Line Items]
Liability for estimated cost to comply with regulation	4,000,000
Plants required for improvements	$ 2
Other MGP, Landfill, or Disposal Sites [Domain]
Loss Contingencies [Line Items]
Number of identified MGP sites under current investigation and/or remediation	4
Gain Contingencies [Line Items]
Number of identified MGP sites under current investigation and/or remediation	4

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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021
Segment Reporting Information [Line Items]
Net income	$ 15		$ 14		$ 62		$ 46
Regulated and Unregulated Operating Revenue	278		255		606		536
Affiliate Revenue	52		46		99		92
Natural gas	35		31		113		88
Total revenues
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	278	[1]	255	[1]	606	[2]	536	[2]
Regulated Electric
Segment Reporting Information [Line Items]
Net income	15		16		47		40
Regulated Electric | Total revenues
Segment Reporting Information [Line Items]
Regulated Operating Revenue, Electric	243	[1]	224	[1]	493	[2]	448	[2]
Regulated Natural Gas
Segment Reporting Information [Line Items]
Net income	(1)		(2)		14		6
Revenues Including Intersegment Revenues	35		31		113		88
All Other
Segment Reporting Information [Line Items]
Net income	$ 1		$ 0		$ 1		$ 0

[1] Total revenues include $52 million and $46 million of affiliate electric revenue for the three months ended June 30, 2022 and 2021, respectively.

[2] Total revenues include $99 million and $92 million of affiliate electric revenue for the six months ended June 30, 2022 and 2021, respectively