CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
OPERATING ACTIVITIES
Net Income	$ 8,875	$ 8,425
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in earnings of affiliates	(6,800)	(6,941)
Distributions received from affiliates	4,943	3,562
Depreciation	4,346	4,485
Deferred income taxes and investment tax credits	4,855	2,057
Regulatory and other deferrals and amortization	330	4,104
Non-cash employee benefit plan costs	1,822	1,761
Other non-cash expense and (income), net	1,146	(2,833)
Changes in assets and liabilities:
Decrease in accounts receivable and unbilled revenues	1,717	6,584
(Decrease) increase in accounts payable	(2,956)	599
Change in prepaid and accrued income taxes	3,015	14,349
Increase in other current assets	(1,424)	(803)
Increase in special deposits and restricted cash	(292)	0
Employee benefit plan funding	(179)	(8)
Decrease in other current liabilities	(2,338)	(3,032)
Increase in other long-term liabilities and other	1,104	73
Net cash provided by operating activities	18,164	32,382
INVESTING ACTIVITIES
Construction and plant expenditures	(9,590)	(10,004)
Reimbursements of restricted cash - bond proceeds	4,139	7,004
Project reimbursement from DOE	1,058	375
Investments in available-for-sale securities	(288)	(345)
Proceeds from sale of available-for-sale securities	208	300
Other investing activities	(505)	(154)
Net cash used for investing activities	(4,978)	(2,824)
FINANCING ACTIVITIES
Net proceeds from the issuance of common stock	1,771	361
Common and preferred dividends paid	(3,192)	(3,161)
Proceeds from revolving credit facility and other short-term borrowings	41,199	11,384
Repayments under revolving credit facility and other short-term borrowings	(53,329)	(25,079)
Common stock offering and debt issue costs	0	(128)
Reduction in capital lease and other financing activities	355	(482)
Net cash used for financing activities	(13,196)	(17,105)
Net change in cash and cash equivalents	(10)	12,453
Cash and cash equivalents at beginning of the period	1,734	2,676
Cash and cash equivalents at end of the period	$ 1,724	$ 15,129