STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 104,638	$ 113,707
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	109,629	101,514
Demand side management program amortization	1,255	1,255
Deferred income taxes	35,541	88,008
Amortization of Investment Tax Credits	(255)	(255)
Allowance for equity funds used during construction	(5,578)	(9,682)
Net derivative losses	201	201
Changes in operating assets and liabilities:
Accounts receivable	(24,416)	(10,982)
Accrued unbilled revenues	18,286	(22,164)
Inventories	3,351	(6,257)
Prepayments and other	(14,589)	(672)
Accounts payable	(6,891)	5,777
Net regulatory assets and liabilities	43,980	(11,550)
Other current liabilities	43,949	29,426
Pension and other employee benefit obligations	(9,961)	(2,535)
Change in other noncurrent assets	1,054	2,684
Change in other noncurrent liabilities	1,227	2,204
Net cash provided by operating activities	301,421	280,679
Investing activities
Utility capital/construction expenditures	(428,991)	(412,976)
Allowance for equity funds used during construction	5,578	9,682
Investments in utility money pool arrangement	(9,000)	(94,000)
Repayments from utility money pool arrangement	9,000	91,000
Net cash used in investing activities	(423,413)	(406,294)
Financing activities
Proceeds from (repayment of) short-term borrowings, net	(37,000)	(84,000)
Proceeds from Issuance of Long-term Debt	198,784	148,241
Borrowings under utility money pool arrangement	407,700	433,000
Repayments under utility money pool arrangement	(405,700)	(471,000)
Capital contributions from parent	34,535	160,000
Dividends paid to parent	(76,192)	(60,632)
Net cash provided by financing activities	122,127	125,609
Net change in cash and cash equivalents	135	(6)
Cash and cash equivalents at beginning of period	596	1,011
Cash and cash equivalents at end of period	731	1,005
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(58,539)	(41,604)
Cash (paid) received for income taxes, net	(41,114)	26,539
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 29,815	$ 19,538