Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
OPERATING REVENUES	$ 115,094	$ 115,569	$ 235,594	$ 236,017
OPERATING EXPENSES:
General and administrative	13,421	13,038	27,502	26,865
Operation and maintenance	19,125	21,231	34,522	38,483
Depreciation	25,313	25,414	50,829	50,729
Regulatory debits	1,213	871	2,461	1,720
Taxes, other than income taxes	4,206	4,312	8,987	8,664
Total operating expenses	63,278	64,866	124,301	126,461
OPERATING INCOME	51,816	50,703	111,293	109,556
OTHER (INCOME) AND OTHER EXPENSES:
Interest expense	8,448	10,952	16,811	22,429
Allowance for equity and borrowed funds used during construction	(362)	(242)	(512)	(625)
Miscellaneous other (income) expenses, net	98	31	213	669
Total other (income) and other expenses	8,184	10,741	16,512	22,473
NET INCOME	43,632	39,962	94,781	87,083
CASH FLOW HEDGES:
Amortization of cash flow hedges into Interest expense	0	(13)	0	(28)
COMPREHENSIVE INCOME	$ 43,632	$ 39,949	$ 94,781	$ 87,055