Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES:
Net income	$ 131,827	$ 127,627
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	75,349	74,102
Regulatory debits	1,758	1,131
Gain on sale of property, plant and equipment	0	(70)
Amortization of deferred charges and credits	440	715
Allowance for equity funds used during construction	(697)	(328)
Changes in current assets and liabilities:
Trade and other accounts receivable	1,745	(678)
Affiliated receivables	546	36,064
Exchange gas due from others	7,693	(236)
Materials and supplies	(148)	174
Other current assets	(1,628)	601
Trade accounts payable	(304)	(6,742)
Affiliated payables	(4,401)	(1,597)
Exchange gas due to others	(7,680)	928
Other accrued liabilities	19,545	15,405
Changes in noncurrent assets and liabilities:
Deferred charges	(3,446)	(2,537)
Noncurrent liabilities	8,610	6,779
Net cash provided by operating activities	229,209	251,338
FINANCING ACTIVITIES:
Cash distributions to parent	(129,000)	(191,000)
Other	(338)	1,415
Net cash used in financing activities	(129,338)	(189,585)
Property, plant and equipment:
Capital expenditures, net of equity AFUDC	(50,599)	(50,994)
Contributions and advances for construction costs	1,323	2,180
Disposal of property, plant and equipment, net	1,695	5,841
Advances to affiliates, net	(52,304)	(18,785)
Net cash used in investing activities	(99,885)	(61,758)
NET DECREASE IN CASH	(14)	(5)
CASH AT BEGINNING OF PERIOD	154	133
CASH AT END OF PERIOD	140	128
Increases to property, plant and equipment	(58,980)	(50,109)
Changes in related accounts payable and accrued liabilities	8,381	(885)
Capital expenditures, net of equity AFUDC	$ (50,599)	$ (50,994)