CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 43.2us-gaap_ProfitLoss	$ 49.3us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided from operating activities
Depreciation and amortization	75.9	67.2
Deferred income taxes and investment tax credits, net	13.0	22.0
Equity in earnings of unconsolidated affiliates	(31.7)	(47.9)
Distributions from unconsolidated affiliates	34.3	32.5
Allowance for equity funds used during construction	(1.5)	(1.1)
Stock-based compensation	0.5us-gaap_ShareBasedCompensation	(8.6)us-gaap_ShareBasedCompensation
Regulatory assets	2.7	3.5
Regulatory liabilities	(0.7)	(1.9)
Other assets	(0.7)	(7.4)
Other liabilities	(0.2)	26.2
Change in certain current assets and liabilities
Accounts receivable, net	19.6	(12.5)
Accounts receivable - unconsolidated affiliates	(1.0)	2.1
Accrued unbilled revenues	9.0	7.0
Fuel, materials and supplies inventories	(23.9)us-gaap_IncreaseDecreaseInInventories	(4.0)us-gaap_IncreaseDecreaseInInventories
Fuel clause under recoveries	41.3	(35.8)
Other current assets	1.3	3.7
Accounts payable	(15.1)	(29.6)
Fuel clause over recoveries	0	(0.4)
Other current liabilities	(26.4)	(41.1)
Net Cash Provided from Operating Activities	139.6	23.2
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(108.8)	(171.8)
Proceeds from sale of assets	0.1	0.4
Net Cash Used in Investing Activities	(108.7)	(171.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid on common stock	(49.9)us-gaap_PaymentsOfDividendsCommonStock	(44.7)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from long-term debt	0	246.9
Issuance of common stock	3.1	3.4
Increase (decrease) in short-term debt	11.9	(61.8)
Net Cash (Used in) Provided from Financing Activities	(34.9)	143.8
NET CHANGE IN CASH AND CASH EQUIVALENTS	(4.0)	(4.4)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	5.5	6.8
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 1.5	$ 2.4

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