CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities
Net income	$ 43,094	$ 33,847
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	51,948	48,372
Deferred income taxes	29,000	11,006
Amortization of investment tax credits	(460)	(468)
Allowance for equity funds used during construction	(700)	(1,722)
Net realized and unrealized hedging and derivative transactions	95	95
Changes in operating assets and liabilities:
Accounts receivable	1,950	24,878
Accrued unbilled revenues	16,108	10,284
Inventories	(1,209)	(1,080)
Other current assets	5,697	12,895
Accounts payable	(11,844)	(16,029)
Net regulatory assets and liabilities	(3,386)	(5,094)
Other current liabilities	(472)	(778)
Change in other noncurrent assets	265	105
Change in other noncurrent liabilities	(9,128)	5,975
Net cash provided by operating activities	120,958	122,286
Investing activities
Utility capital/construction expenditures	(92,687)	(90,149)
Allowance for equity funds used during construction	700	1,722
Other investments	(52)	2,146
Net cash used in investing activities	(92,039)	(86,281)
Financing activities
Proceeds from short-term borrowings, net	28,000	0
Proceeds from notes payable to affiliate	111,300	218,200
Repayment of notes payable to affiliate	(148,300)	(229,800)
Repayment of long-term debt	(44)	(47)
Capital contributions from parent	0	44,032
Dividends paid to parent	(24,840)	(65,415)
Net cash used in financing activities	(33,884)	(33,030)
Net (decrease) increase in cash and cash equivalents	(4,965)	2,975
Cash and cash equivalents at beginning of period	6,445	923
Cash and cash equivalents at end of period	1,480	3,898
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(17,637)	(17,480)
Cash received for income taxes, net	1,843	1,052
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 1,323	$ 1,070