Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (3,989)	$ (5,808)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of electric plant in service	21,934	23,293
Amortization of nuclear fuel	11,278	11,800
Deferred income taxes, net	(3,209)	(3,632)
Allowance for equity funds used during construction	(815)	(2,336)
Other amortization and accretion	4,988	4,250
Gain on sale of property, plant and equipment	0	(545)
Net gains on sale of decommissioning trust funds	(2,191)	(1,388)
Other operating activities	(165)	124
Change in:
Accounts receivable	8,663	8,296
Inventories	(1,638)	1,302
Net under/over-collection of fuel revenues	8,530	4,104
Prepayments and other	(2,494)	(2,975)
Accounts payable	(13,766)	(21,827)
Taxes accrued	(4,843)	(5,127)
Interest accrued	6,097	6,703
Other current liabilities	648	835
Deferred charges and credits	(2,896)	(3,134)
Net cash provided by operating activities	26,132	13,935
Cash flows from investing activities:
Cash additions to utility property, plant and equipment	(53,867)	(52,675)
Cash additions to nuclear fuel	(10,873)	(11,220)
Capitalized interest and AFUDC:
Utility property, plant and equipment	(1,606)	(3,994)
Nuclear fuel	(1,294)	(1,242)
Allowance for equity funds used during construction	815	2,336
Decommissioning trust funds:
Purchases, including funding of $1.1 million	(28,482)	(26,544)
Sales and maturities	26,055	24,078
Proceeds from sale of property, plant, and equipment	0	596
Other investing activities	506	(750)
Net cash used for investing activities	(68,746)	(69,415)
Cash flows from financing activities:
Dividends paid	(12,565)	(11,928)
Borrowings under the revolving credit facility:
Proceeds	128,339	97,655
Payments	(75,735)	(152,343)
Proceeds from issuance of senior notes	0	157,052
Other financing activities	(679)	(1,793)
Net cash provided by financing activities	39,360	88,643
Net increase (decrease) in cash and cash equivalents	(3,254)	33,163
Cash and cash equivalents at beginning of period	8,420	8,149
Cash and cash equivalents at end of period	$ 5,166	$ 41,312