STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities
Net income	$ 12,584	$ 11,360
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	30,724	28,407
Demand side management program amortization	418	453
Deferred income taxes	10,433	12,584
Amortization of investment tax credits	(82)	(69)
Allowance for equity funds used during construction	(2,622)	(1,690)
Net derivative losses	66	67
Changes in operating assets and liabilities:
Accounts receivable	4,777	(36)
Accrued unbilled revenues	(7,384)	7,536
Inventories	6,856	11,690
Prepayments and other	(10,870)	(6,440)
Accounts payable	11,987	(27,344)
Net regulatory assets and liabilities	(7,047)	23,622
Other current liabilities	6,556	1,424
Pension and other employee benefit obligations	(20,739)	(12,110)
Change in other noncurrent assets	(2,593)	(171)
Change in other noncurrent liabilities	(2,683)	392
Net cash provided by operating activities	30,381	49,675
Investing activities
Utility capital/construction expenditures	(106,376)	(86,030)
Allowance for equity funds used during construction	2,622	1,690
Investments in utility money pool arrangement	(12,000)	0
Repayments from utility money pool arrangement	12,000	0
Net cash used in investing activities	(103,754)	(84,340)
Financing activities
Proceeds from short-term borrowings, net	7,000	26,000
Borrowings under utility money pool arrangement	49,000	165,000
Repayments under utility money pool arrangement	(29,000)	(139,000)
Capital contributions from parent	65,000	0
Dividends paid to parent	(16,773)	(16,913)
Net cash provided by financing activities	75,227	35,087
Net change in cash and cash equivalents	1,854	422
Cash and cash equivalents at beginning of period	482	650
Cash and cash equivalents at end of period	2,336	1,072
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(5,171)	(4,648)
Cash received (paid) for income taxes, net	1,015	(3,080)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 31,586	$ 20,041