STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income	$ 33,099	$ 25,055
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	48,479	50,368
Demand side management program amortization	418	418
Deferred income taxes	753	33,079
Amortization of investment tax credits	(13)	(33)
Allowance for equity funds used during construction	(3,417)	(2,135)
Net derivative losses	15	15
Changes in operating assets and liabilities:
Accounts receivable	(11,369)	(1,486)
Accrued unbilled revenues	12,112	427
Inventories	6,018	7,204
Prepayments and other	1,359	(9,655)
Accounts payable	(11,977)	(7,497)
Net regulatory assets and liabilities	26,974	(2,636)
Other current liabilities	(4,936)	(5,444)
Pension and other employee benefit obligations	(7,880)	(22,278)
Change in other noncurrent assets	511	(306)
Change in other noncurrent liabilities	(218)	372
Net cash provided by operating activities	89,928	65,468
Investing activities
Utility capital/construction expenditures	(148,911)	(142,559)
Allowance for equity funds used during construction	3,417	2,135
Investments in utility money pool arrangement	46,000	0
Repayments from utility money pool arrangement	111,000	0
Net cash used in investing activities	(80,494)	(140,424)
Financing activities
Proceeds from short-term borrowings, net	10,000	61,000
Borrowings under utility money pool arrangement	1,000	93,000
Repayments under utility money pool arrangement	(1,000)	(93,000)
Capital contributions from parent	360	45,000
Repayment of long-term debt, including reacquisition premiums	0	(18)
Dividends paid to parent	(26,753)	(30,870)
Net cash (used in) provided by financing activities	(16,393)	75,112
Net change in cash and cash equivalents	(6,959)	156
Cash and cash equivalents at beginning of period	10,871	844
Cash and cash equivalents at end of period	3,912	1,000
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(21,194)	(14,021)
Cash (paid) received for income taxes, net	(4,034)	9,741
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 36,452	$ 38,096