STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating activities
Net income	$ 11,360	$ 10,238
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	28,407	26,714
Demand side management program amortization	453	453
Deferred income taxes	12,584	5,431
Amortization of investment tax credits	(69)	(85)
Allowance for equity funds used during construction	(1,690)	(1,926)
Net derivative losses	67	66
Changes in operating assets and liabilities:
Accounts receivable	(36)	(734)
Accrued unbilled revenues	7,536	5,233
Inventories	11,690	5,658
Prepayments and other	(6,440)	(1,351)
Accounts payable	(27,344)	(1,872)
Net regulatory assets and liabilities	23,622	(5,721)
Other current liabilities	1,424	7,864
Pension and other employee benefit obligations	(12,110)	(3,825)
Change in other noncurrent assets	(171)	(3,798)
Change in other noncurrent liabilities	392	(5,031)
Net cash provided by operating activities	49,675	37,314
Investing activities
Utility capital/construction expenditures	(86,030)	(91,010)
Allowance for equity funds used during construction	1,690	1,926
Net cash used in investing activities	(84,340)	(89,084)
Financing activities
Proceeds from short-term borrowings, net	26,000	26,000
Borrowings under utility money pool arrangement	165,000	154,500
Repayments under utility money pool arrangement	(139,000)	(154,500)
Capital contributions from parent	0	50,000
Dividends paid to parent	(16,913)	(16,358)
Net cash provided by financing activities	35,087	59,642
Net change in cash and cash equivalents	422	7,872
Cash and cash equivalents at beginning of period	650	1,778
Cash and cash equivalents at end of period	1,072	9,650
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(4,648)	(1,737)
Cash paid for income taxes, net	(3,080)	(4,268)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 20,041	$ 8,528