CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 5,230	$ 3,763
Accounts receivable, net	230,090	317,039
Accounts receivable from affiliates	41,657	12,063
Investments in utility money pool arrangement	0	52,000
Accrued unbilled revenues	203,591	304,544
Inventories	184,729	253,997
Regulatory assets	143,654	196,311
Deferred income taxes	21,952	33,349
Derivative instruments	5,565	4,930
Prepayments and other	53,884	19,504
Total current assets	890,352	1,197,500
Property, plant and equipment, net	9,683,409	9,475,571
Other assets
Regulatory assets	789,364	809,011
Derivative instruments	12,305	15,357
Other	42,010	36,066
Total other assets	843,679	860,434
Total assets	11,417,440	11,533,505
Current liabilities
Current portion of long-term debt	855,954	605,633
Short-term debt	5,000	0
Borrowings under utility money pool arrangement	5,000	0
Accounts payable	275,195	362,580
Accounts payable to affiliates	29,621	48,371
Regulatory liabilities	34,950	68,809
Taxes accrued	66,359	116,376
Accrued interest	53,549	53,749
Dividends payable to parent	66,497	66,926
Derivative instruments	47,576	85,518
Other	67,525	75,671
Total current liabilities	1,507,226	1,483,633
Deferred credits and other liabilities
Deferred income taxes	1,881,258	1,775,448
Deferred investment tax credits	43,422	44,725
Regulatory liabilities	420,396	444,442
Asset retirement obligations	43,395	42,207
Derivative instruments	33,757	38,325
Customer advances	221,752	226,097
Pension and employee benefit obligations	184,361	222,707
Other	71,394	69,561
Total deferred credits and other liabilities	2,899,735	2,863,512
Commitments and contingencies
Capitalization
Long-term debt	2,628,010	2,880,642
Common stock - 100 shares authorized at $0.01 par value; 100 shares outstanding at June 30, 2012 and Dec. 31, 2011	0	0
Additional paid in capital	3,344,508	3,316,386
Retained earnings	1,056,826	1,001,709
Accumulated other comprehensive loss	(18,865)	(12,377)
Total common stockholder's equity	4,382,469	4,305,718
Total liabilities and equity	$ 11,417,440	$ 11,533,505