Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (6,966)	$ (3,989)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of electric plant in service	23,814	21,934
Amortization of Nuclear Fuel	10,404	11,278
Deferred income taxes, net	(3,964)	(3,209)
Allowance for equity funds used during construction	(920)	(815)
Other amortization and accretion	5,240	4,988
Net loss (gain) on decommissioning trust funds	2,509	(2,191)
Other operating activities	81	(165)
Change in:
Accounts receivable	8,063	8,663
Inventories	1,418	(1,638)
Prepayments and other	(2,603)	(2,494)
Accounts payable	(23,324)	(13,766)
Taxes accrued	(7,552)	(4,843)
Interest accrued	6,590	6,097
Net over-collection of fuel revenues	7,965	8,530
Other current liabilities	6,697	648
Deferred charges and credits	(1,216)	(2,896)
Net cash provided by operating activities	26,236	26,132
Cash flows from investing activities:
Cash additions to utility property, plant and equipment	(66,924)	(53,867)
Cash additions to nuclear fuel	(9,257)	(10,873)
Insurance proceeds received for equipment	4,175	742
Capitalized interest and AFUDC:
Utility property, plant and equipment	(1,818)	(1,606)
Nuclear fuel and other	(1,214)	(1,294)
Allowance for equity funds used during construction	920	815
Decommissioning trust funds:
Purchases, including funding of $0.5 million and $1.1 million, respectively	(33,578)	(28,482)
Sales and maturities	31,663	26,055
Other investing activities	526	(236)
Net cash used for investing activities	(75,507)	(68,746)
Cash flows from financing activities:
Dividends paid	(13,615)	(12,565)
Borrowings under the revolving credit facility:
Proceeds	192,670	128,339
Payments	(133,136)	(75,735)
Other financing activities	(1,064)	(679)
Net cash provided by financing activities	44,855	39,360
Net decrease in cash and cash equivalents	(4,416)	(3,254)
Cash and cash equivalents at beginning of period	6,990	8,420
Cash and cash equivalents at end of period	$ 2,574	$ 5,166