CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities
Net income	$ 138,800	$ 133,700
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	148,200	122,800
Deferred income taxes	(1,200)	13,200
Amortization of investment tax credits	(600)	(700)
Allowance for equity funds used during construction	(4,100)	(10,900)
Net realized and unrealized hedging and derivative transactions	(2,600)	1,800
Other Operating Activities, Cash Flow Statement	1,900	(5,000)
Changes in operating assets and liabilities:
Accounts receivable	(54,700)	(19,400)
Accrued unbilled revenues	32,200	58,400
Inventories	33,500	60,600
Prepayments and other	(9,300)	1,300
Accounts payable	(45,700)	(25,800)
Net regulatory assets and liabilities	93,200	31,100
Other current liabilities	42,600	500
Pension and other employee benefit obligations	(43,700)	(22,800)
Net cash provided by operating activities	328,500	338,800
Investing activities
Utility capital/construction expenditures	(282,900)	(415,800)
Investments in utility money pool arrangement	(131,000)	(36,000)
Repayments from utility money pool arrangement	131,000	56,000
Net cash used in investing activities	(282,900)	(395,800)
Financing activities
Repayments of short-term borrowings, net	(68,000)	95,000
Borrowings under utility money pool arrangement	0	158,000
Repayments under utility money pool arrangement	0	(110,000)
Capital contributions from parent	112,200	6,500
Proceeds from Issuance of Long-term Debt	392,600	0
Repayments of Long-term Debt	400,000	0
Dividends paid to parent	(91,600)	(76,200)
Other, net	0	(100)
Net cash (used in) provided by financing activities	(54,800)	73,200
Net change in cash and cash equivalents	(9,200)	16,200
Cash and cash equivalents at beginning of period	33,400	7,500
Cash and cash equivalents at end of period	24,200	23,700
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(65,300)	(60,100)
Cash paid for income taxes, net	(10,700)	(46,500)
Supplemental disclosure of non-cash investing and financing transactions:
Inventory transfers to plant, property and equipment	6,900	4,100
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	652,800	0
Allowance for equity funds used during construction	4,100	10,900
Accrued property, plant and equipment additions	$ 85,100	$ 128,500