STATEMENTS OF INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Revenues	$ 412,449	$ 475,982	$ 484,376
Operating Expenses:
Cost of Sales (Excluding depreciation)	187,866	266,382	293,852
Operations	68,149	67,261	62,533
Maintenance	13,122	11,550	8,869
Depreciation	30,358	29,319	26,856
Energy and Other Taxes	10,291	10,769	10,827
Total Operating Expenses	309,786	385,281	402,937
Operating Income	102,663	90,701	81,439
Other Income and Expense	3,429	543	1,302
Interest Charges	(18,922)	(17,641)	(16,442)
Income Before Income Taxes	87,170	73,603	66,299
Income Taxes	(34,281)	(29,678)	(27,104)
Net Income	$ 52,889	$ 43,925	$ 39,195