Fair Value of Financial Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value of Financial Assets and Liabilities [Abstract]

Gross Notional Amounts of Commodity Forwards and Options

The following table details the gross notional amounts of commodity forwards and options at June 30, 2012 and Dec. 31, 2011:

(Amounts in Thousands) (a)(b)	June 30, 2012	Dec. 31, 2011
MMBtu of natural gas	177	1,393

(a) Amounts are not reflective of net positions in the underlying commodities.

(b) Notional amounts for options are also included on a gross basis, but are weighted for the probability of exercise.

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

The following tables present, for each of the hierarchy levels, NSP-Wisconsin's liabilities that are measured at fair value on a recurring basis:

	Dec. 31, 2011
	Fair Value
							Fair Value
(Thousands of Dollars)	Level 1		Level 2		Level 3		Total
Current derivative liabilities
Natural gas commodity	$	418	$	2,096	$	-	$	2,514

Carrying Amount and Fair Value of Long-term Debt

As of June 30, 2012 and Dec. 31, 2011, other financial instruments for which the carrying amount did not equal fair value were as follows:

	June 30, 2012				Dec. 31, 2011
	Carrying				Carrying
(Thousands of Dollars)	Amount		Fair Value		Amount		Fair Value
Long-term debt, including current portion	$	369,391	$	482,869	$	369,369	$	474,356