Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Derivative Instruments (Tables) [Abstract]

Derivative instruments in balance sheet



		September 30, 2013								December 31, 2012
		Derivative Asset				Derivative Liability				Derivative Asset				Derivative Liability
		(Millions of Dollars)

Natural Gas		$	3.1			$	2.1			$	3.0			$	1.9
Fuel Oil		0.3				—				0.4				—
FTRs		5.6				—				4.7				—
Coal		3.4				—				11.1				—
Total		$	12.4			$	2.1			$	19.2			$	1.9

Derivative instruments' estimated notional volumes and gain (losses)



		Three Months Ended September 30, 2013						Three Months Ended September 30, 2012
		Volume		Gains (Losses)				Volume		Gains (Losses)
				(Millions of Dollars)						(Millions of Dollars)

Natural Gas		6.3 million Dth		$	(1.1	)		17.2 million Dth		$	(5.3	)
Fuel Oil		2.5 million gallons		(0.1		)		1.7 million gallons		0.1
FTRs		6,322 MW		5.4				5,927 MW		2.9
Total				$	4.2					$	(2.3	)



		Nine Months Ended September 30, 2013						Nine Months Ended September 30, 2012
		Volume		Gains (Losses)				Volume		Gains (Losses)
				(Millions of Dollars)						(Millions of Dollars)

Natural Gas		36.4 million Dth		$	(5.7	)		56.0 million Dth		$	(35.7	)
Fuel Oil		6.2 million gallons		0.1				5.5 million gallons		1.5
FTRs		17,410 MW		11.0				16,581 MW		5.1
Total				$	5.4					$	(29.1	)

Offsetting Assets and Liabilities [Table Text Block]



	September 30, 2013								December 31, 2012
	Derivative				Derivative				Derivative				Derivative
	Asset				Liability				Asset				Liability
	(Millions of Dollars)

Gross Amount Recognized on the Balance Sheet	$	12.4			$	2.1			$	19.2			$	1.9
Gross Amount Not Offset on Balance Sheet (a)	(0.3		)		(1.7		)		(0.5		)		(1.8		)
Net Amount	$	12.1			$	0.4			$	18.7			$	0.1


(a)	Gross Amount Not Offset on Balance Sheet includes cash collateral posted of $1.5 million and $1.3 million as of September 30, 2013 and December 31, 2012, respectively.