CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Operating Revenues	$ 185,098	$ 168,468	$ 364,484	$ 329,756
OPERATING EXPENSES
Operation and maintenance	28,837	28,494	55,121	52,223
General and administrative	19,289	17,413	35,869	35,194
Depreciation and amortization	23,352	22,567	46,440	44,682
Taxes other than income taxes	13,556	11,626	27,164	23,934
Other operating (income) and expense - net	(167)	(530)	(316)	(523)
Total operating expenses	84,867	79,570	164,278	155,510
OPERATING INCOME	100,231	88,898	200,206	174,246
OTHER EXPENSES (INCOME)
Interest expense	36,484	35,333	72,754	70,362
Allowance for equity funds used during construction	(4,099)	(3,435)	(7,609)	(6,578)
Other income	(497)	(1,154)	(718)	(1,672)
Other expense	1,594	755	2,269	1,031
Total other expenses (income)	33,482	31,499	66,696	63,143
INCOME BEFORE INCOME TAXES	66,749	57,399	133,510	111,103
INCOME TAX PROVISION	23,753	21,098	48,512	40,598
NET INCOME	$ 42,996	$ 36,301	$ 84,998	$ 70,505
Basic earnings per common share (Note 8)	$ 0.84	$ 0.72	$ 1.67	$ 1.40
Diluted earnings per common share (Note 8)	$ 0.83	$ 0.71	$ 1.64	$ 1.38
Dividends declared per common share	$ 0.335	$ 0.320	$ 0.670	$ 0.640