Statements of Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue	$ 243,309	$ 245,631	$ 229,763
Operating expenses:
Fuel and purchased power	87,519	93,222	87,757
Operations and maintenance	65,835	66,683	68,884
Gain on sale of operating assets	0	(768)	(6,238)
Depreciation and amortization	27,621	27,217	22,030
Taxes - property	4,753	4,557	2,062
Total operating expenses	185,728	190,911	174,495
Operating income	57,581	54,720	55,268
Other income (expense):
Interest expense	(17,602)	(16,712)	(18,737)
AFUDC - borrowed	161	419	2,224
Interest income	376	154	318
AFUDC - equity	325	705	2,748
Other expense	0	(344)	(35)
Other income	554	145	223
Total other income (expense)	(16,186)	(15,633)	(13,259)
Income from continuing operations before income taxes	41,395	39,087	42,009
Income tax expense	(14,309)	(11,990)	(10,741)
Net income	$ 27,086	$ 27,097	$ 31,268