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STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 263.3 $ 215.7 $ 200.4
Adjustments to reconcile net income to net cash provided from operating activities      
Depreciation and amortization 216.1 208.7 187.4
Impairment of assets 0 0 0.3
Deferred income taxes and investment tax credits, net 95.0 118.8 202.8
Allowance for equity funds used during construction (20.4) (11.4) (15.1)
Stock-based compensation expense 3.0 0 0
Price risk management liabilities 0 0 0.7
Regulatory assets 14.0 24.1 20.2
Regulatory liabilities (1.9) (12.4) (17.5)
Other assets 2.0 4.8 2.4
Other liabilities (62.9) (55.8) (55.3)
Change in certain current assets and liabilities      
Accounts receivable, net (40.1) 3.6 26.3
Accrued unbilled revenues (2.5) 0.4 (10.2)
Fuel, materials and supplies inventories 54.0 (37.5) (50.5)
Gas imbalance assets 0.1 0 0.5
Fuel clause under recoveries (0.8) (0.7) 23.7
Other current assets (7.6) (5.2) (4.8)
Accounts payable 13.4 41.4 (2.4)
Accounts payable - affiliates (3.1) (0.2) (1.8)
Income taxes payable - parent 23.0 106.6 (112.1)
Fuel clause over recoveries (22.2) (157.6) 178.9
Other current liabilities 26.9 22.4 6.3
Net Cash Provided from Operating Activities 549.3 465.7 580.2
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (less allowance for equity funds used during construction) (844.5) (631.6) (600.5)
Reimbursement of capital expenditures 49.6 28.2 0
Proceeds from sale of assets 0.6 1.3 1.0
Net Cash Used in Investing Activities (794.3) (602.1) (599.5)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from long-term debt 246.3 246.2 0.1
Capital contribution from OGE Energy 50.0 0 0
Dividends paid on common stock 0 (60.2) 0
Decrease in short-term debt 0 0 (31.5)
Changes in advances with parent (51.3) (49.6) 0
Net Cash Provided from Financing Activities 245.0 136.4 (31.4)
NET CHANGE IN CASH AND CASH EQUIVALENTS 0 0 (50.7)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 0 0 50.7
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 0 $ 0 $ 0