Balance Sheet (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash	$ 0	$ 169
Receivables:
Trade	39,289	42,669
Affiliated companies	1,665	1,441
Advances to affiliate	51,741	171,867
Other	8,061	14,051
Materials and supplies	10,126	10,183
Exchange gas due from others	2,846	3,733
Exchange gas offset	0	201
Prepayments and other	5,519	6,164
Total current assets	119,247	250,478
PROPERTY, PLANT AND EQUIPMENT, at cost	3,320,314	3,306,205
Less-Accumulated depreciation	1,427,012	1,367,632
Total property, plant and equipment, net	1,893,302	1,938,573
OTHER ASSETS:
Deferred charges	1,826	2,110
Regulatory assets	36,187	40,853
Total other assets	38,013	42,963
Total assets	2,050,562	2,232,014
Payables:
Trade	17,972	14,363
Affiliated companies	4,627	11,959
Accrued liabilities:
Taxes, other than income taxes	16,874	11,033
Interest	11,548	4,045
Exchange gas due to others	3,064	2,252
Exchange gas offset	709	0
Customer advances	1,930	5,573
Other	5,109	3,417
Long-term debt due within one year	184,858	174,837
Total current liabilities	246,691	227,479
LONG-TERM DEBT	334,158	518,583
OTHER NONCURRENT LIABILITIES:
Asset retirement obligations	60,927	82,454
Regulatory liabilities	29,640	26,802
Other	7,245	6,108
Total other noncurrent liabilities	97,812	115,364
CONTINGENT LIABILITIES AND COMMITMENTS (Note 2)
OWNER'S EQUITY:
Owner's capital	1,073,892	1,073,892
Retained earnings	298,009	296,668
Accumulated other comprehensive income	0	28
Total owner's equity	1,371,901	1,370,588
Total liabilities and owner's equity	$ 2,050,562	$ 2,232,014