Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies

Summary of estimated coal take-or-pay commitments

The following table summarizes our estimated coal take-or-pay commitments (dollars in millions):

	Years Ended December 31,
	2013		2014		2015		2016		2017		Thereafter
Coal take-or-pay commitments (a)	$	90	$	93	$	96	$	63	$	27	$	121

(a) Total take-or-pay commitments are approximately $490 million.  The total net present value of these commitments is approximately $375 million.

Summary of actual take-or-pay commitments

The following table summarizes the actual amounts purchased under the coal contracts which include take-or-pay provisions for each of the last three years (dollars in millions):

	Year Ended December 31,
	2012		2011		2010
Total purchases	$	196	$	191	$	156