Condensed Consolidated Statement of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net Income	$ 137,150	$ 134,666
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	130,432	124,886
Allowance for equity funds used during construction (Equity AFUDC)	(6,497)	(3,993)
Changes in operating assets and liabilities:
Receivables - affiliates	(153)	3,789
- others	(6,556)	22,912
Transportation and exchange gas receivables	(8,293)	(4,988)
Inventories	3,752	(36,756)
Payables - affiliates	22,402	3,529
- others	25,716	6,081
Transportation and exchange gas payables	515	3,740
Accrued liabilities	25,694	(2,993)
Other, net	(24,393)	7,382
Net cash provided by operating activities	299,769	258,255
Cash flows from financing activities:
Cash distributions	(101,000)	(203,791)
Cash contributions from parent	86,000
Other, net	(5,727)	(4,674)
Net cash used in financing activities	(20,727)	(208,465)
Cash flows from investing activities:
Property, plant and equipment additions, net of equity AFUDC*	(160,780)	(138,677)
Disposal of property, plant and equipment, net	(3,924)	6,122
Advances to affiliates, net	(99,629)	95,507
Purchase of long-term investments	(11,460)
Purchase of ARO trust investments	(24,545)	(33,145)
Proceeds from sale of ARO trust investments	26,655	20,812
Other, net	(5,407)	(405)
Net cash used in investing activities	(279,090)	(49,786)
Increase (decrease) in cash and cash equivalents	(48)	4
Cash and cash equivalents at beginning of period	148	108
Cash and cash equivalents at end of period	$ 100	$ 112

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