Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 24,530	$ 34,711
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of electric plant in service	44,700	41,651
Amortization of nuclear fuel	21,379	21,877
Deferred income taxes, net	8,789	15,141
Allowance for equity funds used during construction	(6,543)	(6,367)
Other amortization and accretion	8,888	9,145
Gain on sale of property, plant and equipment	0	(2,083)
Net gains on sale of decommissioning trust funds	(3,563)	(2,967)
Other operating activities	243	(64)
Change in:
Accounts receivable	(20,782)	(33,585)
Inventories	(2,813)	(100)
Net over-collection (under-collection) of fuel revenues	10,833	(13,369)
Prepayments and other	(7,476)	(6,691)
Accounts payable	(15,528)	1,983
Other current liabilities	(214)	428
Deferred charges and credits	(2,068)	(2,739)
Net cash provided by operating activities	60,375	56,971
Cash flows from investing activities:
Cash additions to utility property, plant and equipment	(147,040)	(105,999)
Cash additions to nuclear fuel	(22,424)	(17,690)
Capitalized interest and AFUDC:
Utility property, plant and equipment	(10,555)	(10,018)
Nuclear fuel	(2,550)	(2,527)
Allowance for equity funds used during construction	6,543	6,367
Decommissioning trust funds:
Purchases, including funding of $2.3 million	(41,029)	(40,924)
Sales and maturities	37,158	36,374
Proceeds from sale of property, plant and equipment	0	2,377
Other investing activities	82	1,650
Net cash used for investing activities	(179,815)	(130,390)
Cash flows from financing activities:
Dividends paid	(23,220)	(21,969)
Borrowings under the revolving credit facility:
Proceeds	167,103	142,951
Payments	(53,563)	(59,531)
Other financing activities	(1,020)	(928)
Net cash provided by financing activities	89,300	60,523
Net decrease in cash and cash equivalents	(30,140)	(12,896)
Cash and cash equivalents at beginning of period	40,504	25,592
Cash and cash equivalents at end of period	$ 10,364	$ 12,696