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STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 328.0 $ 305.5 $ 284.1
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 321.6 280.9 316.4
Deferred income taxes and investment tax credits, net 56.6 119.8 116.8
Allowance for equity funds used during construction (23.8) (39.7) (14.2)
Stock-based compensation expense 4.6 3.1 2.3
Regulatory assets (10.8) 3.7 (21.4)
Regulatory liabilities (16.5) (3.7) (11.8)
Other assets 1.9 1.6 13.7
Other liabilities 0.0 (59.9) (20.1)
Change in certain current assets and liabilities:      
Accounts receivable and accrued unbilled revenues, net 19.5 (22.2) (6.1)
Fuel, materials and supplies inventories 27.3 (5.0) 32.5
Fuel recoveries (3.4) 53.0 (112.6)
Other current assets 23.1 29.7 (26.7)
Accounts payable 19.0 22.5 (29.8)
Income taxes payable - parent (15.6) 92.0 (3.1)
Other current liabilities 72.5 (65.6) 52.9
Net Cash Provided from Operating Activities 804.0 715.7 572.9
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (less allowance for equity funds used during construction) (573.6) (824.1) (660.1)
Proceeds from sale of assets 0.1 0.7 0.9
Net cash used in investing activities (573.5) (823.4) (659.2)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from long-term debt 396.0 592.1 0.0
Changes in advances with parent (191.4) (189.3) 351.5
Payment of long-term debt (250.1) (125.1) (110.2)
Dividends paid on common stock (185.0) (170.0) (155.0)
Net cash (used in) provided from financing activities (230.5) 107.7 86.3
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