Balance Sheet (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash	$ 0	$ 169
Receivables:
Trade	38,634	42,669
Affiliated companies	1,659	1,441
Advances to affiliate	36,468	171,867
Other	10,559	14,051
Materials and supplies	10,180	10,183
Exchange gas due from others	1,594	3,733
Exchange gas offset	0	201
Prepayments and other	6,266	6,164
Total current assets	105,360	250,478
PROPERTY, PLANT AND EQUIPMENT, at cost	3,324,778	3,306,205
Less-Accumulated depreciation	1,410,668	1,367,632
Total property, plant and equipment, net	1,914,110	1,938,573
OTHER ASSETS:
Deferred charges	1,953	2,110
Regulatory assets	37,258	40,853
Total other assets	39,211	42,963
Total assets	2,058,681	2,232,014
Payables:
Trade	16,959	14,363
Affiliated companies	6,483	11,959
Accrued liabilities:
Taxes, other than income taxes	12,387	11,033
Interest	3,501	4,045
Exchange gas due to others	1,456	2,252
Exchange gas offset	631	0
Customer advances	2,046	5,573
Other	4,653	3,417
Long-term debt due within one year	184,843	174,837
Total current liabilities	232,959	227,479
LONG-TERM DEBT	334,028	518,583
OTHER NONCURRENT LIABILITIES:
Asset retirement obligations	85,286	82,454
Regulatory liabilities	28,694	26,802
Other	6,071	6,108
Total other noncurrent liabilities	120,051	115,364
CONTINGENT LIABILITIES AND COMMITMENTS (Note 2)
OWNER'S EQUITY:
Owner's capital	1,073,892	1,073,892
Retained earnings	297,751	296,668
Accumulated other comprehensive income	0	28
Total owner's equity	1,371,643	1,370,588
Total liabilities and owner's equity	$ 2,058,681	$ 2,232,014