STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net income	$ 54,734	$ 42,823
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	81,600	73,628
Demand side management program amortization	837	837
Deferred income taxes	53,217	11,866
Amortization of investment tax credits	(106)	(170)
Allowance for equity funds used during construction	(4,716)	(3,493)
Net derivative losses	134	133
Changes in operating assets and liabilities:
Accounts receivable	(12,997)	(19,478)
Accrued unbilled revenues	(25,690)	10,927
Inventories	5,889	10,776
Prepayments and other	30,189	(21,378)
Accounts payable	9,888	(10,210)
Net regulatory assets and liabilities	(3,216)	41,291
Other current liabilities	(4,862)	13,510
Pension and other employee benefit obligations	(16,357)	(10,435)
Change in other noncurrent assets	(373)	607
Change in other noncurrent liabilities	2,693	606
Net cash provided by operating activities	170,864	141,840
Investing activities
Utility capital/construction expenditures	(263,653)	(280,615)
Proceeds from insurance recoveries	987	0
Allowance for equity funds used during construction	4,716	3,493
Investments in utility money pool arrangement	0	(9,000)
Repayments from utility money pool arrangement	0	9,000
Other	(1,174)	0
Net cash used in investing activities	(259,124)	(277,122)
Financing activities
Proceeds from short-term borrowings, net	10,000	172,000
Repayment of long-term debt	0	(85)
Borrowings under utility money pool arrangement	391,000	163,700
Repayments under utility money pool arrangement	(291,000)	(179,700)
Capital contributions from parent	16,225	34,535
Dividends paid to parent	(38,182)	(53,167)
Net cash provided by financing activities	88,043	137,283
Net change in cash and cash equivalents	(217)	2,001
Cash and cash equivalents at beginning of period	834	596
Cash and cash equivalents at end of period	617	2,597
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(39,960)	(38,527)
Cash received (paid) for income taxes, net	41,170	(36,992)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 30,172	$ 26,513