Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies [Abstract]

Estimated Minimum Purchases Under Fuel Contracts

The estimated minimum purchases for NSP-Wisconsin under these contracts as of Dec. 31, 2012 are as follows:

(Millions of dollars)	Coal		Natural gas supply		Natural gas storage and transportation
2013	$	6.3	$	10.3	$	13.2
2014		1.2		0.3		11.3
2015		0.7		0.3		10.7
2016		0.7		0.3		10.7
2017		0.7		0.3		8.6
Thereafter		4.6		-		20.5
Total (a)	$	14.2	$	11.5	$	75.0

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

Low-income Housing Limited Partnerships

Amounts reflected in NSP-Wisconsin's consolidated balance sheets for low-income housing limited partnerships include the following:

(Thousands of Dollars)	Dec. 31, 2012		Dec. 31, 2011
Current assets	$	357	$	270
Property, plant and equipment, net		2,599		2,727
Other noncurrent assets		105		102
Total assets	$	3,061	$	3,099
Current liabilities	$	1,388	$	1,389
Mortgages and other long-term debt payable		617		640
Other noncurrent liabilities		39		43
Total liabilities	$	2,044	$	2,072

Future Commitments Under Operating Leases

Future commitments under operating leases are:

(Millions of Dollars)
2013	$	0.8
2014		0.8
2015		0.8
2016		0.8
2017		0.9
Thereafter		9.3
Total	$	13.4

Guarantee Issued and Outstanding

The following table presents the guarantee issued and outstanding for NSP-Wisconsin:

(Millions of Dollars)	Guarantee Amount		Current Exposure		Term or Expiration Date		Triggering Event Requiring Performance
Guarantee of customer loans for the Farm Rewiring Program	$	1.0	$	0.4		2017	(a)

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

Asset Retirement Obligations

A reconciliation of NSP-Wisconsin's AROs is shown in the tables below for the years ended Dec. 31, 2012 and 2011, respectively:

	Beginning						Revisions		Ending
	Balance		Liabilities				to Prior		Balance
(Thousands of Dollars)	Jan. 1, 2012		Recognized		Accretion		Estimates		Dec. 31, 2012 (a)
Electric plant
Steam production asbestos	$	-	$	1,962	$	-	$	-	$	1,962
Electric transmission and distribution		357		-		13		633		1,003
Natural gas plant
Gas transmission and distribution		67		-		4		-		71
Total liability (b)	$	424	$	1,962	$	17	$	633	$	3,036

	Beginning						Revisions		Ending
	Balance		Liabilities				to Prior		Balance
(Thousands of Dollars)	Jan. 1, 2011		Recognized		Accretion		Estimates		Dec. 31, 2011 (a)
Electric plant
Electric transmission and distribution	$	67	$	-	$	3	$	287	$	357
Natural gas plant
Gas transmission and distribution		63		-		4		-		67
Total liability (b)	$	130	$	-	$	7	$	287	$	424

(a) There were no ARO liabilities settled during the 12 months ended Dec. 31, 2012 or 2011.

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