Statement of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
STATEMENT OF COMPREHENSIVE INCOME
OPERATING REVENUES	$ 111,372	$ 109,919
OPERATING EXPENSES:
General and administrative	17,308	15,423
Operation and maintenance	16,130	15,273
Depreciation	23,310	22,558
Regulatory credits	(289)	(267)
Taxes, other than income taxes	5,254	5,700
Total operating expenses	61,713	58,687
Operating Income	49,659	51,232
Interest income -
Affiliated	1	3
Other	5	0
Allowance for equity funds used during construction	213	120
Miscellaneous other expense, net	(75)	(106)
Total other income - net	144	17
INTEREST CHARGES:
Interest on long-term debt	11,110	11,110
Other interest	483	510
Allowance for borrowed funds used during construction	(98)	(54)
Total interest charges	11,495	11,566
NET INCOME	38,308	39,683
CASH FLOW HEDGES:
Amortization of cash flow hedges	(16)	(15)
COMPREHENSIVE INCOME	$ 38,292	$ 39,668