Fair Value of Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Gross Notional Amounts of Commodity Forwards and Options

The following table details the gross notional amounts of commodity options at Dec. 31, 2013 and 2012:

(Amounts in Thousands)(a)(b)	Dec. 31, 2013	Dec. 31, 2012
MMBtu of natural gas	987	53

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

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

Financial Impact of Qualifying Cash Flow Hedges on Accumulated Other Comprehensive Loss

Financial Impact of Qualifying Cash Flow Hedges — The impact of qualifying interest rate cash flow hedges on NSP-Wisconsin’s accumulated other comprehensive loss, included in the consolidated statements of common stockholder’s equity and in the consolidated statements of comprehensive income, is detailed in the following table:

(Thousands of Dollars)	2013			2012			2011
Accumulated other comprehensive loss related to cash flow hedges at Jan. 1	$	(437	)	$	(514	)	$	(590	)
After-tax net realized losses on derivative transactions reclassified into earnings	76			77			76
Accumulated other comprehensive loss related to cash flow hedges at Dec. 31	$	(361	)	$	(437	)	$	(514	)

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

Recurring Fair Value Measurements — The following table presents for each of the fair value hierarchy levels, NSP-Wisconsin’s derivative assets and liabilities measured at fair value on a recurring basis:

	Dec. 31, 2013
	Fair Value
(Thousands of Dollars)	Level 1		Level 2		Level 3		Fair Value Total		Counterparty Netting(a)		Total(b)
Current derivative assets
Natural gas commodity	$	—	$	580	$	—	$	580	$	—	$	580

	Dec. 31, 2012
	Fair Value
(Thousands of Dollars)	Level 1		Level 2		Level 3		Fair Value Total		Counterparty Netting(a)		Total(c)
Current derivative liabilities
Natural gas commodity	$	—	$	11	$	—	$	11	$	—	$	11

^(a)  NSP-Wisconsin nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Dec. 31, 2013 and 2012.  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 other current assets balance of $5.1 million at Dec. 31, 2013 in the consolidated balance sheets.

^(c)  Included in other current liabilities balance of $11.0 million at Dec. 31, 2012 in the consolidated balance sheets.

Carrying Amount and Fair Value of Long-term Debt

As of Dec. 31, 2013 and 2012, other financial instruments for which the carrying amount did not equal fair value were as follows:

	2013				2012
(Thousands of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	468,597	$	518,269	$	468,563	$	576,353