STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities
Net income	$ 40,790	$ 41,654
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	62,304	57,204
Demand side management program amortization	837	905
Deferred income taxes	26,501	26,162
Amortization of investment tax credits	(164)	(137)
Allowance for equity funds used during construction	(4,822)	(3,392)
Net derivative losses	133	134
Changes in operating assets and liabilities:
Accounts receivable	(19,542)	(15,564)
Accrued unbilled revenues	(36,171)	(11,177)
Inventories	3,102	10,385
Prepayments and other	4,764	(4,556)
Accounts payable	24,335	(6,924)
Net regulatory assets and liabilities	(27,545)	32,017
Other current liabilities	4,724	(1,715)
Pension and other employee benefit obligations	(19,816)	(11,527)
Change in other noncurrent assets	(3,714)	(449)
Change in other noncurrent liabilities	(2,915)	(44)
Net cash provided by operating activities	52,801	112,976
Investing activities
Utility capital/construction expenditures	(254,309)	(184,909)
Allowance for equity funds used during construction	4,822	3,392
Investments in utility money pool arrangement	(12,000)	(77,000)
Repayments from utility money pool arrangement	12,000	72,000
Net cash used in investing activities	(249,487)	(186,517)
Financing activities
Proceeds from short-term borrowings, net	40,000	0
Proceeds from issuance of long term debt	0	108,951
Borrowings under utility money pool arrangement	280,000	231,000
Repayments under utility money pool arrangement	(214,000)	(236,000)
Capital contributions from parent	125,000	3,811
Dividends paid to parent	(33,886)	(33,689)
Net cash provided by financing activities	197,114	74,073
Net change in cash and cash equivalents	428	532
Cash and cash equivalents at beginning of period	482	650
Cash and cash equivalents at end of period	910	1,182
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(31,165)	(29,487)
Cash paid for income taxes, net	(1,669)	(10,056)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 46,739	$ 24,540