CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 1,480	$ 6,445
Accounts receivable, net	49,717	51,667
Accrued unbilled revenues	35,471	51,579
Inventories	27,825	26,616
Regulatory assets	13,437	14,084
Prepaid taxes	15,154	21,097
Prepayments and other	2,801	2,555
Total current assets	145,885	174,043
Property, plant and equipment, net	1,172,002	1,130,342
Other assets
Regulatory assets	208,349	214,402
Other investments	4,088	4,036
Other	3,314	3,705
Total other assets	215,751	222,143
Total assets	1,533,638	1,526,528
Current liabilities
Current portion of long-term debt	1,458	1,502
Short-term debt	28,000	0
Notes payable to affiliates	550	37,550
Accounts payable	22,177	35,124
Accounts payable to affiliates	31,205	36,320
Dividends payable to parent	8,101	8,441
Regulatory liabilities	3,940	10,377
Accrued interest	5,738	6,438
Taxes accrued	2,865	867
Derivative instruments	1,506	1,787
Other	19,815	17,543
Total current liabilities	125,355	155,949
Deferred credits and other liabilities
Deferred income taxes	225,364	198,793
Deferred investment tax credits	8,650	9,110
Regulatory liabilities	119,890	117,318
Environmental liabilities	97,462	97,740
Pension and employee benefit obligations	44,506	51,592
Customer advances	17,095	17,352
Other	6,052	8,142
Total deferred credits and other liabilities	519,019	500,047
Commitments and contingent liabilities
Capitalization
Long-term debt	367,935	367,854
Common stock - authorized 1,000,000 shares of $100 par value; outstanding 933,000 shares	93,300	93,300
Additional paid in capital	187,071	187,071
Retained earnings	241,491	222,897
Accumulated other comprehensive loss	(533)	(590)
Total common stockholder's equity	521,329	502,678
Total liabilities and equity	$ 1,533,638	$ 1,526,528