BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 650	$ 1,778
Accounts receivable, net	65,030	44,871
Accounts receivable from affiliates	1,314	1,610
Accrued unbilled revenues	104,142	110,184
Inventories	35,575	29,849
Regulatory assets	25,244	21,547
Derivative instruments	7,892	7,892
Deferred income taxes	18,247	19,051
Prepayments and other	7,486	5,006
Total current assets	265,580	241,788
Property, plant and equipment, net	2,594,732	2,401,266
Other assets
Regulatory assets	294,813	283,207
Derivative instruments	56,841	64,734
Other	11,883	10,668
Total other assets	363,537	358,609
Total assets	3,223,849	3,001,663
Current liabilities
Current portion of long-term debt	0	44,500
Short-term debt	0	49,000
Borrowings under utility money pool arrangement	5,000	0
Accounts payable	140,412	134,322
Accounts payable to affiliates	11,828	24,525
Regulatory liabilities	57,104	53,197
Taxes accrued	19,910	19,867
Accrued interest	13,842	12,128
Dividends payable to parent	16,913	16,358
Derivative instruments	3,601	3,601
Other	29,841	21,349
Total current liabilities	298,451	378,847
Deferred credits and other liabilities
Deferred income taxes	596,581	541,204
Deferred investment tax credits	1,776	2,051
Regulatory liabilities	105,335	134,952
Asset retirement obligations	27,266	21,131
Derivative instruments	41,391	44,991
Pension and employee benefit obligations	76,307	52,280
Other	6,569	10,827
Total deferred credits and other liabilities	855,225	807,436
Commitments and contingencies
Capitalization
Long-term debt	993,314	853,267
Common stock - 200 shares authorized of $1.00 par value; 100 shares outstanding at Dec. 31, 2011 and Dec. 31, 2010	0	0
Additional paid in capital	783,162	693,531
Retained earnings	295,201	270,257
Accumulated other comprehensive loss	(1,504)	(1,675)
Total common stockholder's equity	1,076,859	962,113
Total liabilities and equity	$ 3,223,849	$ 3,001,663