Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Derivative Instruments (Tables) [Abstract]



	September 30, 2011				December 31, 2010
	Derivative Asset		Derivative Liability		Derivative Asset		Derivative Liability
			(Millions of Dollars)
Natural Gas	$	3.3	$	10.2	$	2.5	$	11.6
Fuel Oil	0.5		—		4.4		—
FTRs	10.1		—		5.9		—
Coal	0.6		—		2.9		—
Total	$	14.5	$	10.2	$	15.7	$	11.6

Derivative instruments' estimated notional volumes and gain (losses)



	Three Months Ended September 30, 2011				Three Months Ended September 30, 2010
	Volume	Gains (Losses)			Volume	Gains (Losses)
		(Millions of Dollars)				(Millions of Dollars)
Natural Gas	15.7 million Dth	$	(10.5	)	17.4 million Dth	$	(8.8	)
Power	zero MWh	—			65,040 MWh	(0.5		)
Fuel Oil	2.2 million gallons	2.4			2.3 million gallons	(0.1		)
FTRs	5,896 MW	5.2			6,584 MW	4.4
Total		$	(2.9	)		$	(5.0	)



	Nine Months Ended September 30, 2011				Nine Months Ended September 30, 2010
	Volume	Gains (Losses)			Volume	Gains (Losses)
		(Millions of Dollars)				(Millions of Dollars)
Natural Gas	54.0 million Dth	$	(27.7	)	65.0 million Dth	$	(33.3	)
Power	zero MWh	—			224,640 MWh	(0.5		)
Fuel Oil	8.8 million gallons	4.9			6.0 million gallons	(0.1		)
FTRs	18,439 MW	10.5			18,673 MW	16.2
Total		$	(12.3	)		$	(17.7	)

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

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