Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
OPERATING REVENUES	$ 116,933	$ 116,249	$ 352,143	$ 349,978
OPERATING EXPENSES:
General and administrative	13,714	14,244	42,913	45,688
Operation and maintenance	19,160	16,902	54,477	53,953
Depreciation	25,190	24,704	75,349	74,102
Regulatory debits	574	369	1,758	1,131
Taxes, other than income taxes	3,995	4,027	12,907	13,173
Total operating expenses	62,633	60,246	187,404	188,047
OPERATING INCOME	54,300	56,003	164,739	161,931
OTHER (INCOME) AND OTHER EXPENSES:
Interest expense	11,506	11,524	34,525	34,584
Allowance for equity and borrowed funds used during construction	(556)	(233)	(1,027)	(481)
Miscellaneous other (income) expenses, net	40	224	(586)	201
Total other (income) and other expenses	10,990	11,515	32,912	34,304
NET INCOME	43,310	44,488	131,827	127,627
CASH FLOW HEDGES:
Amortization of cash flow hedges into Interest expense	(15)	(15)	(46)	(46)
COMPREHENSIVE INCOME	$ 43,295	$ 44,473	$ 131,781	$ 127,581