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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Estimated Minimum Purchases Under Fuel Contracts


(Millions of Dollars)	Refuse-derived fuel/wood		Natural gas supply		Natural gas storage and transportation
2021	$	5	$	8	$	16
2022	1		—		14
2023	1		—		11
2024	1		—		9
2025	1		—		8
Thereafter	3		—		14
Total (a)	$	12	$	8	$	72

Low-income Housing Limited Partnerships


(Millions of Dollars)	Dec. 31, 2020		Dec. 31, 2019
Current assets	$	—	$	—
Property, plant and equipment, net	1		1
Other noncurrent assets	—		—
Total assets	$	1	$	1

Current liabilities	$	—	$	—
Mortgages and other long-term debt payable	1		1
Other noncurrent liabilities	—		—
Total liabilities	$	1	$	1

Asset Retirement Obligations

NSP-Wisconsin’s AROs were as follows:


	2020
(Millions of Dollars)	Jan. 1, 2020		Cash Flow Revisions (a)		Dec. 31, 2020 (b)
Electric
Distribution	$	5	$	—	$	5
Steam, hydro and other production	4		4		8
Natural gas
Distribution	9		—		9
Total liability (c)	$	18	$	4	$	22

(a)In 2020, AROs were revised for changes in timing and estimates of cash flows. Revisions in steam, hydro and other production AROs primarily related to changes in cost estimates for remediation of ash containment facilities.

(b)There were no ARO amounts incurred or settled in 2020.

(c)Included in other long-term liabilities balance in the consolidated balance sheet.


	2019
(Millions of Dollars)	Jan. 1, 2019		Accretion		Cash Flow Revisions		Dec. 31, 2019 (a)
Electric
Distribution	$	5	$	—	$	—	$	5
Steam, hydro and other production	4		—		—		4
Natural gas
Distribution	9		1		(1)		9
Total liability (b)	$	18	$	1	$	(1)	$	18

(a)There were no ARO amounts incurred or settled in 2019.

(b)Included in other long-term liabilities balance in the consolidated balance sheet.

Schedule of Long-term Contracts for Purchase of Electric Power

Estimated minimum purchases under these contracts as of Dec. 31, 2020:


(Millions of Dollars)	Refuse-derived fuel/wood		Natural gas supply		Natural gas storage and transportation
2021	$	5	$	8	$	16
2022	1		—		14
2023	1		—		11
2024	1		—		9
2025	1		—		8
Thereafter	3		—		14
Total (a)	$	12	$	8	$	72

(a)Excludes additional amounts allocated to NSP-Wisconsin through intercompany charges.

Guarantee Issued and Outstanding

Guarantee issued and outstanding for NSP-Wisconsin:

(Millions of Dollars)

Guarantor

Guarantee
Amount

Current
Exposure

Triggering
Event

Guarantee of customer loans for the Farm Rewiring Program (a)

NSP-Wisconsin

—

(b)

(a)As of Dec. 31, 2020, no claims were outstanding against the guarantee.

(b)The debtor becomes the subject of bankruptcy or other insolvency proceedings.

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

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