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STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 305.5 $ 284.1 $ 268.9
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 280.9 316.4 299.9
Deferred income taxes and investment tax credits, net 119.8 116.8 127.6
Allowance for equity funds used during construction (39.7) (14.2) (8.3)
Stock-based compensation expense 3.1 2.3 2.6
Regulatory assets 3.7 (21.4) (9.1)
Regulatory liabilities (3.7) (11.8) (27.5)
Other assets 1.6 13.7 10.1
Other liabilities (59.9) (20.1) 22.2
Change in certain current assets and liabilities:      
Accounts receivable and accrued unbilled revenues, net (22.2) (6.1) 17.7
Fuel, materials and supplies inventories (5.0) 32.5 (56.2)
Fuel recoveries 53.0 (112.6) 129.6
Other current assets 29.7 (26.7) (16.0)
Accounts payable 22.5 (29.8) 22.3
Income taxes payable - parent 92.0 (3.1) (16.7)
Other current liabilities (65.6) 52.9 3.4
Net Cash Provided from Operating Activities 715.7 572.9 770.5
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (less allowance for equity funds used during construction) (824.1) (660.1) (551.6)
Proceeds from sale of assets 0.7 0.9 2.6
Net cash used in investing activities (823.4) (659.2) (549.0)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from long-term debt 592.1 0.0 0.0
Changes in advances with parent (189.3) 351.5 (101.3)
Payment of long-term debt (125.1) (110.2) (0.2)
Dividends paid on common stock (170.0) (155.0) (120.0)
Net cash provided from (used in) financing activities 107.7 86.3 (221.5)
NET CHANGE IN CASH AND CASH EQUIVALENTS 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 0.0 $ 0.0 $ 0.0