CONDENSED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Revenues	$ 179,436	$ 180,323
Operating Expenses:
Cost of Sales (Excluding depreciation)	86,499	88,574
Operations	20,564	18,273
Maintenance	3,192	3,009
Depreciation	7,157	7,460
Energy and Other Taxes	3,169	4,514
Total Operating Expenses	120,581	121,830
Operating Income	58,855	58,493
Other Income and Expense	1,349	878
Interest Charges	(4,189)	(5,029)
Income Before Income Taxes	56,015	54,342
Income Taxes	(20,977)	(22,046)
Net Income	$ 35,038	$ 32,296