CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 89,509	$ 32,912
Accounts receivable, net	300,762	305,469
Accounts receivable from affiliates	13,517	21,042
Investments in utility money pool arrangement	69,000	0
Accrued unbilled revenues	220,153	297,535
Inventories	261,621	223,058
Regulatory assets	185,959	176,596
Deferred income taxes	14,847	13,877
Derivative instruments	5,778	6,294
Prepayments and other	17,585	54,235
Total current assets	1,178,731	1,131,018
Property, plant and equipment, net	9,405,840	9,200,556
Other assets
Regulatory assets	813,673	824,205
Derivative instruments	15,616	18,035
Other	52,081	55,016
Total other assets	881,370	897,256
Total assets	11,465,941	11,228,830
Current liabilities
Current portion of long-term debt	6,902	6,970
Short-term debt	0	269,400
Accounts payable	344,180	382,380
Accounts payable to affiliates	27,896	28,270
Regulatory liabilities	65,363	50,018
Taxes accrued	88,367	94,321
Accrued interest	55,071	48,866
Dividends payable to parent	67,511	66,828
Derivative instruments	68,863	29,047
Other	106,259	100,984
Total current liabilities	830,412	1,077,084
Deferred credits and other liabilities
Deferred income taxes	1,716,798	1,539,583
Deferred investment tax credits	45,336	47,338
Regulatory liabilities	437,202	472,846
Asset retirement obligations	76,905	72,687
Derivative instruments	39,372	43,220
Customer advances	233,010	244,345
Pension and employee benefit obligations	243,861	303,946
Other	63,364	61,334
Total deferred credits and other liabilities	2,855,848	2,785,299
Commitments and contingent liabilities
Capitalization
Long-term debt	3,475,692	3,228,253
Common stock - authorized 100 shares of $0.01 par value; outstanding 100 shares	0	0
Additional paid in capital	3,331,807	3,255,586
Retained earnings	980,198	875,151
Accumulated other comprehensive (loss) income	(8,016)	7,457
Total common stockholder's equity	4,303,989	4,138,194
Total liabilities and equity	$ 11,465,941	$ 11,228,830