Statements Of Operations (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statements Of Operations [Abstract]
Operating revenues	$ 77,748,517	$ 71,180,773
Operating expenses:
Fuel	34,211,952	32,565,031
Production	4,707,220	4,285,834
Purchased power	7,477,112	6,471,636
Transmission	1,625,181	1,623,136
Distribution	2,938,379	3,719,993
Consumer accounts	1,553,137	1,389,631
Administrative, general and other	5,709,405	5,832,640
Depreciation and amortization	9,621,632	8,131,159
Total operating expenses	67,844,018	64,019,060
Interest expense:
Long-term debt and other	6,293,692	5,863,988
Charged to construction	(1,002,066)	(1,991,642)
Interest expense, net	5,291,626	3,872,346
Net operating margins	4,612,873	3,289,367
Nonoperating margins:
Interest income	172,253	72,903
Allowance for funds used during construction	44,069	60,205
Capital credits, patronage dividends and other	12,381	593
Total nonoperating margins	228,703	133,701
Assignable margins	$ 4,841,576	$ 3,423,068