CONDENSED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Operating Revenues	$ 60,952	$ 59,674	$ 340,656	$ 300,308
Operating Expenses:
Cost of Sales (Excluding depreciation)	23,400	24,717	151,572	128,427
Operations	20,769	18,613	73,181	62,132
Maintenance	3,275	3,353	9,715	10,140
Depreciation	9,342	8,654	27,562	25,128
Energy and Other Taxes	798	1,052	2,813	5,332
Total Operating Expenses	57,584	56,389	264,843	231,159
Operating Income	3,368	3,285	75,813	69,149
Other Income and Expense	2,186	764	4,749	3,024
Interest Charges	(4,046)	(2,629)	(12,680)	(8,379)
Income Before Income Taxes	1,508	1,420	67,882	63,794
Income Taxes	(534)	(471)	(25,440)	(23,511)
Net Income	$ 974	$ 949	$ 42,442	$ 40,283