STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities
Net income	$ 41,654	$ 34,910
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	57,204	53,634
Demand side management program amortization	905	905
Deferred income taxes	26,162	19,709
Amortization of investment tax credits	(137)	(170)
Allowance for equity funds used during construction	(3,392)	(3,284)
Net derivative losses	134	133
Changes in operating assets and liabilities:
Accounts receivable	(15,564)	(22,037)
Accrued unbilled revenues	(11,177)	(26,881)
Inventories	10,385	3,174
Prepayments and other	(4,556)	(741)
Accounts payable	(6,924)	17,332
Net regulatory assets and liabilities	32,017	(6,100)
Other current liabilities	(1,715)	1,614
Pension and other employee benefit obligations	(11,527)	(3,922)
Change in other noncurrent assets	(449)	(835)
Change in other noncurrent liabilities	(44)	(5,072)
Net cash provided by operating activities	112,976	62,369
Investing activities
Utility capital/construction expenditures	(184,909)	(162,990)
Allowance for equity funds used during construction	3,392	3,284
Investments in utility money pool arrangement	(77,000)	0
Repayments from utility money pool arrangement	72,000	0
Other, net	0	221
Net cash used in investing activities	(186,517)	(159,485)
Financing activities
Proceeds from short-term borrowings, net	0	82,000
Proceeds from issuance of long-term debt	108,951	0
Borrowings under utility money pool arrangement	231,000	258,500
Repayments under utility money pool arrangement	(236,000)	(258,500)
Capital contributions from parent	3,811	50,000
Dividends paid to parent	(33,689)	(32,218)
Net cash provided by financing activities	74,073	99,782
Net change in cash and cash equivalents	532	2,666
Cash and cash equivalents at beginning of period	650	1,778
Cash and cash equivalents at end of period	1,182	4,444
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(29,487)	(28,279)
Cash paid for income taxes, net	(10,056)	(4,954)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 24,540	$ 5,205