STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities
Net income	$ 42,823	$ 46,770
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	73,628	66,692
Demand side management program amortization	837	837
Deferred income taxes	11,866	51,678
Amortization of investment tax credits	(170)	(170)
Allowance for equity funds used during construction	(3,493)	(6,535)
Net derivative losses	133	133
Changes in operating assets and liabilities:
Accounts receivable	(19,478)	(15,131)
Accrued unbilled revenues	10,927	(33,034)
Inventories	10,776	2,022
Prepayments and other	(21,378)	(12,786)
Accounts payable	(10,210)	16,949
Net regulatory assets and liabilities	41,291	(34,055)
Other current liabilities	13,510	1,536
Pension and other employee benefit obligations	(10,435)	(3,122)
Change in other noncurrent assets	607	3,558
Change in other noncurrent liabilities	606	2,198
Net cash provided by operating activities	141,840	87,540
Investing activities
Utility capital/construction expenditures	(280,615)	(281,398)
Allowance for equity funds used during construction	3,493	6,535
Investments in utility money pool arrangement	(9,000)	(22,000)
Repayments from utility money pool arrangement	9,000	22,000
Net cash used in investing activities	(277,122)	(274,863)
Financing activities
Proceeds from (repayment of) short-term borrowings, net	172,000	15,000
Proceeds from Issuance of Long-term Debt	(85)	148,510
Borrowings under utility money pool arrangement	163,700	382,000
Repayments under utility money pool arrangement	(179,700)	(420,000)
Capital contributions from parent	34,535	100,000
Dividends paid to parent	(53,167)	(36,264)
Net cash provided by financing activities	137,283	189,246
Net change in cash and cash equivalents	2,001	1,923
Cash and cash equivalents at beginning of period	596	1,011
Cash and cash equivalents at end of period	2,597	2,934
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(38,527)	(33,668)
Cash (paid) received for income taxes, net	(36,992)	8,705
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 26,513	$ 22,423