STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities
Net income	$ 34,910	$ 32,095
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	53,634	52,437
Demand side management program amortization	905	951
Deferred income taxes	19,709	17,929
Amortization of investment tax credits	(170)	(149)
Allowance for equity funds used during construction	(3,284)	(1,444)
Net realized and unrealized hedging and derivative transactions	133	133
Changes in operating assets and liabilities:
Accounts receivable	(22,037)	(16,464)
Accrued unbilled revenues	(26,881)	(15,831)
Inventories	3,174	3,106
Prepayments and other	(741)	(1,832)
Accounts payable	17,332	(3,697)
Net regulatory assets and liabilities	(6,100)	(26,814)
Other current liabilities	1,614	(3,897)
Change in other noncurrent assets	(835)	(1,579)
Change in other noncurrent liabilities	(8,994)	(1,811)
Net cash provided by operating activities	62,369	33,133
Investing activities
Utility capital/construction expenditures	(162,990)	(111,327)
Allowance for equity funds used during construction	3,284	1,444
Investments in utility money pool arrangement	0	(204,200)
Repayments from utility money pool arrangement	0	281,200
Other investments	221	0
Net cash used in investing activities	(159,485)	(32,883)
Financing activities
Proceeds from short-term borrowings, net	82,000	24,000
Borrowings under utility money pool arrangement	258,500	19,000
Repayments under utility money pool arrangement	(258,500)	0
Repayment of long-term debt	0	(25,000)
Capital contributions from parent	50,000	8,802
Dividends paid to parent	(32,218)	(34,136)
Net cash provided by (used in) financing activities	99,782	(7,334)
Net increase (decrease) in cash and cash equivalents	2,666	(7,084)
Cash and cash equivalents at beginning of period	1,778	7,363
Cash and cash equivalents at end of period	4,444	279
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(28,279)	(41,180)
Cash paid for income taxes, net	(4,954)	(9,885)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 5,205	$ 9,587