CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) [Abstract]
Operating Revenues	$ 84,268	$ 79,937	$ 181,353	$ 170,944
Operating Expenses
Purchased Power - affiliates	17,457	10,514	34,868	27,072
Purchased Power	22,321	26,697	46,262	51,857
Production	2,267	2,660	5,411	5,616
Transmission - affiliates	3,281	1,668	5,538	3,054
Transmission - other	6,297	6,058	13,401	13,245
Other operation	15,378	15,836	33,972	31,682
Maintenance	7,507	7,392	13,214	15,118
Depreciation	4,595	4,330	9,080	8,682
Taxes other than income	4,419	4,470	9,076	9,213
Income tax (benefit) expense	(481)	(791)	2,376	1,047
Total Operating Expenses	83,041	78,834	173,198	166,586
Utility Operating Income	1,227	1,103	8,155	4,358
Other Income
Equity in earnings of affiliates	6,987	5,115	13,928	10,510
Allowance for equity funds during construction	28	7	84	10
Other income	699	721	1,402	1,433
Other deductions	(3,646)	(921)	(4,300)	(1,600)
Income tax expense	(1,222)	(1,714)	(3,524)	(3,303)
Total Other Income	2,846	3,208	7,590	7,050
Interest Expense
Interest on long-term debt	3,191	2,756	6,335	5,542
Other interest	158	115	287	226
Allowance for borrowed funds during construction	(12)	(5)	(38)	(7)
Total Interest Expense	3,337	2,866	6,584	5,761
Net Income	736	1,445	9,161	5,647
Dividends declared on preferred stock	92	92	184	184
Earnings available for common stock	$ 644	$ 1,353	$ 8,977	$ 5,463
Per Common Share Data:
Basic earnings per share	$ 0.05	$ 0.11	$ 0.67	$ 0.46
Diluted earnings per share	$ 0.05	$ 0.11	$ 0.67	$ 0.46
Average shares of common stock outstanding - basic	13,399,128	12,078,724	13,376,675	11,903,080
Average shares of common stock outstanding - diluted	13,482,185	12,109,591	13,444,680	11,933,923
Dividends declared per share of common stock	$ 0.23	$ 0.23	$ 0.69	$ 0.69