Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATIONS:
Net income	$ 104,733	$ 45,590
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	162,467	149,862
Amortization (deferral) of regulatory assets	6,554	(10,639)
Amortization of debt premium	132	574
Deferred income taxes and investment tax credit adjustments - net	15,680	24,284
Gain (Loss) on Early Extinguishment of Debt	0	22,051
Allowance for equity funds used during construction	(20,125)	(9,969)
Change in certain assets and liabilities:
Accounts receivable	(29,864)	4,267
Fuel, materials and supplies	31,705	(20,751)
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable	12,163	0
Income taxes receivable	(3,279)	(359)
Accounts payable and accrued expenses	(1,306)	191
Accrued real estate and personal property taxes	4,456	3,257
Accrued interest	11,354	8,743
Pension and other postretirement benefit expenses	(23,573)	(29,986)
Short-term and long-term regulatory assets and liabilities	(26,623)	3,777
Prepaids and other current assets	(2,802)	(5,113)
Other - net	7,396	2,458
Net cash provided by operating activities	249,068	188,237
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures - utility	(516,895)	(458,180)
Project development costs	(852)	(8,146)
Cost of removal, net of salvage	(10,881)	(7,997)
Other	(1,525)	58
Net cash used in investing activities	(530,153)	(474,265)
CASH FLOWS FROM FINANCING ACTIVITIES:
Short-term debt borrowings	248,000	222,000
Short-term debt repayments	(389,850)	(222,000)
Proceeds from Debt, Net of Issuance Costs	347,662	663,350
Repayments of Long-term Debt	0	420,242
Retirement of long-term debt, including make-whole provision	(86,443)	(61,170)
Issuance of common stock	134,276	214,366
Proceeds from Contributed Capital	78,738
Proceeds from Contributions from Parent		0
Preferred dividends of subsidiary	(2,410)	(2,410)
Deferred financing costs paid	(3,964)	(7,363)
Retention payments on capital expenditures	(14,990)	(1,829)
Other	(152)	(369)
Net cash provided by financing activities	310,867	384,333
Net change in cash and cash equivalents	29,782	98,305
Cash and cash equivalents at beginning of period	21,521	26,933
Cash and cash equivalents at end of period	51,303
Cash paid during the period for:
Interest (net of amount capitalized)	54,911	64,133
Income taxes	24,700
Non-cash investing activities:
Accruals for capital expenditures	$ 37,357	$ 61,188