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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues from contracts with customers $ 2,916.6 $ 2,607.3 $ 3,304.2
Other revenues 68.7 67.0 71.5
Operating revenues 2,985.3 2,674.3 3,375.7
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE 1,076.4 911.7 1,662.4
OPERATING EXPENSES      
Other operation and maintenance 514.4 502.6 501.4
Depreciation and amortization 539.5 506.6 460.9
Taxes other than income 109.7 103.2 101.5
Operating expenses 1,163.6 1,112.4 1,063.8
OPERATING INCOME 745.3 650.2 649.5
OTHER INCOME (EXPENSE)      
Allowance for equity funds used during construction 25.5 19.4 6.9
Other net periodic benefit income (expense) (2.2) 5.6 (12.9)
Gain on equity securities (Note 1) 0.0 0.0 282.1
Other income 30.6 48.2 74.6
Other expense (24.1) (29.0) (44.6)
Net other income 29.8 44.2 306.1
INTEREST EXPENSE      
Interest on long-term debt 228.3 205.0 162.1
Allowance for borrowed funds used during construction (14.6) (7.1) (4.0)
Interest on short-term debt and other interest charges 40.8 23.5 8.2
Interest expense 254.5 221.4 166.3
INCOME BEFORE TAXES 520.6 473.0 789.3
INCOME TAX EXPENSE 79.1 56.2 123.6
NET INCOME $ 441.5 $ 416.8 $ 665.7
BASIC AVERAGE COMMON SHARES OUTSTANDING 200.8 200.3 200.2
DILUTED AVERAGE COMMON SHARES OUTSTANDING 201.3 200.9 200.8
BASIC EARNINGS PER AVERAGE COMMON SHARE $ 2.20 $ 2.08 $ 3.33
DILUTED EARNINGS PER AVERAGE COMMON SHARE $ 2.19 $ 2.07 $ 3.32
Other comprehensive income, net of tax $ 4.5 $ 4.7 $ 12.9
Comprehensive income 446.0 421.5 678.6
OG&E [Member]      
Revenues from contracts with customers 2,916.6 2,607.3 3,304.2
Other revenues 68.7 67.0 71.5
Operating revenues 2,985.3 2,674.3 3,375.7
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE 1,076.4 911.7 1,662.4
OPERATING EXPENSES      
Other operation and maintenance 514.1 505.0 491.9
Depreciation and amortization 539.5 506.6 460.9
Taxes other than income 109.7 99.4 98.0
Operating expenses 1,163.3 1,111.0 1,050.8
OPERATING INCOME 745.6 651.6 662.5
OTHER INCOME (EXPENSE)      
Allowance for equity funds used during construction 25.5 19.4 6.9
Other net periodic benefit income (expense) (1.6) 6.5 1.2
Other income 12.5 23.9 6.5
Other expense (4.5) (6.3) (3.4)
Net other income 31.9 43.5 11.2
INTEREST EXPENSE      
Interest on long-term debt 212.0 200.4 157.4
Allowance for borrowed funds used during construction (14.6) (7.1) (4.0)
Interest on short-term debt and other interest charges 17.0 6.6 4.4
Interest expense 214.4 199.9 157.8
INCOME BEFORE TAXES 563.1 495.2 515.9
INCOME TAX EXPENSE 93.2 68.8 76.4
NET INCOME 469.9 426.4 439.5
Other comprehensive income, net of tax 0.0 0.0 0.0
Comprehensive income $ 469.9 $ 426.4 $ 439.5