STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 25,055	$ 22,523
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	50,368	40,660
Demand side management program amortization	418	418
Deferred income taxes	33,079	25,751
Amortization of investment tax credits	(33)	(53)
Allowance for equity funds used during construction	(2,135)	(2,337)
Net derivative losses	15	67
Changes in operating assets and liabilities:
Accounts receivable	(1,486)	(2,415)
Accrued unbilled revenues	427	1,352
Inventories	7,204	6,275
Prepayments and other	(9,655)	(12,428)
Accounts payable	(7,497)	(8,684)
Net regulatory assets and liabilities	(2,636)	8,361
Other current liabilities	(5,444)	2,289
Pension and other employee benefit obligations	(22,278)	(17,201)
Change in other noncurrent assets	(306)	(653)
Change in other noncurrent liabilities	372	427
Net cash provided by operating activities	65,468	64,352
Investing activities
Utility capital/construction expenditures	(142,559)	(135,720)
Allowance for equity funds used during construction	2,135	2,337
Net cash used in investing activities	(140,424)	(133,383)
Financing activities
Repayment of short-term borrowings, net	61,000	65,000
Repayment of long-term debt	(18)	0
Borrowings under utility money pool arrangement	93,000	168,000
Repayments under utility money pool arrangement	(93,000)	(168,000)
Capital contributions from parent	45,000	16,225
Dividends paid to parent	(30,870)	(12,538)
Net cash provided by financing activities	75,112	68,687
Net change in cash and cash equivalents	156	(344)
Cash and cash equivalents at beginning of period	844	834
Cash and cash equivalents at end of period	1,000	490
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(14,021)	(8,017)
Cash received for income taxes, net	9,741	405
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 38,096	$ 34,913