BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 1,072	$ 650
Accounts receivable, net	62,116	65,030
Accounts receivable from affiliates	4,264	1,314
Accrued unbilled revenues	96,606	104,142
Inventories	23,885	35,575
Regulatory assets	23,692	25,244
Derivative instruments	7,892	7,892
Deferred income taxes	26,484	18,247
Prepayments and other	13,926	7,486
Total current assets	259,937	265,580
Property, plant and equipment, net	2,647,255	2,594,732
Other assets
Regulatory assets	293,427	294,813
Derivative instruments	54,868	56,841
Other	12,512	11,883
Total other assets	360,807	363,537
Total assets	3,267,999	3,223,849
Current liabilities
Short-term debt	26,000	0
Borrowings under utility money pool arrangement	31,000	5,000
Accounts payable	113,679	140,412
Accounts payable to affiliates	7,688	11,828
Regulatory liabilities	77,559	57,104
Taxes accrued	12,817	19,910
Accrued interest	24,655	13,842
Dividends payable	16,776	16,913
Derivative instruments	3,601	3,601
Other	27,167	29,841
Total current liabilities	340,942	298,451
Deferred credits and other liabilities
Deferred income taxes	618,143	596,581
Regulatory liabilities	103,095	105,335
Asset retirement obligations	27,675	27,266
Derivative instruments	40,491	41,391
Pension and employee benefit obligations	64,084	76,307
Other	8,665	8,345
Total deferred credits and other liabilities	862,153	855,225
Commitments and contingencies
Capitalization
Long-term debt	993,419	993,314
Common stock - 200 shares authorized of $1.00 par value; 100 shares outstanding at March 31, 2012 and Dec. 31, 2011, respectively	0	0
Additional paid in capital	783,162	783,162
Retained earnings	289,784	295,201
Accumulated other comprehensive loss	(1,461)	(1,504)
Total common stockholder's equity	1,071,485	1,076,859
Total liabilities and equity	$ 3,267,999	$ 3,223,849