BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 16,997	$ 650
Accounts receivable, net	84,071	65,030
Accounts receivable from affiliates	3,679	1,314
Accrued unbilled revenues	112,735	104,142
Inventories	31,974	35,575
Regulatory assets	22,462	25,244
Derivative instruments	7,892	7,892
Deferred income taxes	36,367	18,247
Prepayments and other	6,282	7,486
Total current assets	322,459	265,580
Property, plant and equipment, net	2,785,404	2,594,732
Other assets
Regulatory assets	291,999	294,813
Derivative instruments	50,922	56,841
Other	15,089	11,883
Total other assets	358,010	363,537
Total assets	3,465,873	3,223,849
Current liabilities
Borrowings under utility money pool arrangement	0	5,000
Accounts payable	124,868	140,412
Accounts payable to affiliates	10,852	11,828
Regulatory liabilities	96,341	57,104
Taxes accrued	33,124	19,910
Accrued interest	25,218	13,842
Dividends payable	16,521	16,913
Derivative instruments	3,601	3,601
Other	30,182	29,841
Total current liabilities	340,707	298,451
Deferred credits and other liabilities
Deferred income taxes	653,612	596,581
Regulatory liabilities	96,582	105,335
Asset retirement obligations	28,513	27,266
Derivative instruments	38,690	41,391
Pension and employee benefit obligations	65,666	76,307
Other	7,474	8,345
Total deferred credits and other liabilities	890,537	855,225
Commitments and contingencies
Capitalization
Long-term debt	1,103,625	993,314
Common stock - 200 shares authorized of $1.00 par value; 100 shares outstanding at Sept. 30, 2012 and Dec. 31, 2011, respectively	0	0
Additional paid in capital	786,973	783,162
Retained earnings	345,406	295,201
Accumulated other comprehensive loss	(1,375)	(1,504)
Total common stockholder's equity	1,131,004	1,076,859
Total liabilities and equity	$ 3,465,873	$ 3,223,849