CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 61,011	$ 56,287
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	67,936	60,017
Deferred income taxes	38,595	28,691
Amortization of Investment Tax Credits	(396)	(504)
Allowance for equity funds used during construction	(5,926)	(4,915)
Loss on Monticello life cycle management/extended power uprate project	5,237	0
Net derivative losses (gains)	338	(356)
Changes in operating assets and liabilities:
Accounts receivable	10,026	7,761
Accrued unbilled revenues	12,657	13,009
Inventories	2,847	(5,172)
Other current assets	14,471	11,693
Accounts payable	(25,023)	(9,910)
Net regulatory assets and liabilities	(13,962)	(35,546)
Other current liabilities	5,948	955
Pension and other employee benefit obligations	(3,931)	(6,882)
Change in other noncurrent assets	11	(46)
Change in other noncurrent liabilities	595	1,013
Net cash provided by operating activities	170,434	116,095
Investing activities
Utility capital/construction expenditures	(171,586)	(194,886)
Allowance for equity funds used during construction	5,926	4,915
Other, net	(90)	(13)
Net cash used in investing activities	(165,750)	(189,984)
Financing activities
Proceeds from short-term borrowings, net	(78,000)	(60,000)
Proceeds from notes payable to affiliate	0	30
Proceeds from Issuance of Long-term Debt	98,038	98,625
Repayments of long-term debt	0	(54)
Capital contributions from parent	25,060	68,011
Dividends paid to parent	(40,265)	(32,331)
Net cash provided by financing activities	4,833	74,281
Net change in cash and cash equivalents	9,517	392
Cash and cash equivalents at beginning of period	1,285	1,349
Cash and cash equivalents at end of period	10,802	1,741
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(18,647)	(17,313)
Cash received for income taxes, net	9,662	915
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 13,520	$ 28,693