STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities
Net income	$ 75,827	$ 99,901
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	93,171	86,426
Demand side management program amortization	1,255	1,358
Deferred income taxes	36,831	36,600
Amortization of investment tax credits	(245)	(206)
Allowance for equity funds used during construction	(6,972)	(5,062)
Net derivative losses	201	201
Changes in operating assets and liabilities:
Accounts receivable	(32,999)	(21,406)
Accrued unbilled revenues	(25,860)	(8,593)
Inventories	(5,558)	3,601
Prepayments and other	(7,046)	1,204
Accounts payable	21,281	(21,834)
Net regulatory assets and liabilities	(11,629)	44,031
Other current liabilities	62,149	25,664
Pension and other employee benefit obligations	(18,923)	(10,527)
Change in other noncurrent assets	(1,580)	(1,577)
Change in other noncurrent liabilities	(2,221)	(656)
Net cash provided by operating activities	177,682	229,125
Investing activities
Utility capital/construction expenditures	(423,435)	(275,253)
Allowance for equity funds used during construction	6,972	5,062
Investments in utility money pool arrangement	(12,000)	(134,000)
Repayments from utility money pool arrangement	12,000	134,000
Net cash used in investing activities	(416,463)	(270,191)
Financing activities
Repayments of short-term borrowings, net	(9,000)	0
Proceeds from issuance of long-term debt	94,809	108,691
Borrowings under utility money pool arrangement	565,000	240,000
Repayments under utility money pool arrangement	(485,000)	(245,000)
Capital contributions from parent	124,935	3,811
Dividends paid to parent	(51,361)	(50,089)
Net cash provided by financing activities	239,383	57,413
Net change in cash and cash equivalents	602	16,347
Cash and cash equivalents at beginning of period	482	650
Cash and cash equivalents at end of period	1,084	16,997
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(41,273)	(35,345)
Cash paid for income taxes, net	(18,719)	(14,391)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 25,143	$ 28,886