CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net income	$ 22,267	$ 24,235
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	21,682	19,590
Deferred income taxes	8,241	10,069
Amortization of investment tax credits	(132)	(168)
Allowance for equity funds used during construction	(2,219)	(1,572)
Loss on Monticello life cycle management/extended power uprate project	5,237	0
Net derivative losses	554	437
Changes in operating assets and liabilities:
Accounts receivable	(5,496)	(13,722)
Accrued unbilled revenues	10,428	12,194
Inventories	9,830	6,980
Other current assets	11,335	11,145
Accounts payable	(11,851)	12,378
Net regulatory assets and liabilities	(1,404)	(20,462)
Other current liabilities	1,289	2,936
Pension and other employee benefit obligations	(4,915)	(8,007)
Change in other noncurrent assets	(4)	23
Change in other noncurrent liabilities	535	160
Net cash provided by operating activities	65,377	56,216
Investing activities
Utility capital/construction expenditures	(79,926)	(59,699)
Allowance for equity funds used during construction	2,219	1,572
Other, net	(90)	(41)
Net cash used in investing activities	(77,797)	(58,168)
Financing activities
Proceeds from short-term borrowings, net	2,000	11,000
Repayments of long-term debt	(128)	(18)
Capital contributions from parent	25,210	0
Dividends paid to parent	(14,957)	(8,032)
Net cash provided by financing activities	12,125	2,950
Net change in cash and cash equivalents	(295)	998
Cash and cash equivalents at beginning of period	1,285	1,349
Cash and cash equivalents at end of period	990	2,347
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(5,791)	(5,827)
Cash received for income taxes, net	625	5,573
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 14,550	$ 16,436