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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
CURRENT ASSETS      
Cash and cash equivalents $ 0.1   $ 0.2
Accounts receivable 220.1   208.8
Accrued unbilled revenues 108.9   72.7
Income taxes receivable 6.6   18.2
Fuel inventories 145.5   158.5
Materials and supplies, at average cost 238.6   254.3
Other 67.5   58.8
Total current assets 787.3   771.5
OTHER PROPERTY AND INVESTMENTS      
Other 119.7   114.0
Total other property and investments 119.7   114.0
PROPERTY, PLANT AND EQUIPMENT      
In service 15,910.7   15,588.2
Construction work in progress 689.1   522.2
Total property, plant and equipment 16,599.8   16,110.4
Less: accumulated depreciation 4,912.5   4,809.4
Net property, plant and equipment 11,687.3   11,301.0
DEFERRED CHARGES AND OTHER ASSETS      
Regulatory assets 586.2   577.6
Other 31.3   26.6
Total deferred charges and other assets 617.5   604.2
TOTAL ASSETS 13,211.8   12,790.7
CURRENT LIABILITIES      
Short-term debt 361.3   499.2
Accounts payable 256.8   276.4
Dividends payable 84.0   83.8
Customer deposits 107.8   103.5
Accrued taxes 49.2   47.6
Accrued interest 60.3   57.4
Accrued compensation 39.7   46.8
Long-term debt due within one year 79.4   0.0
Fuel clause over recoveries 29.8   20.5
Other 41.4   44.0
Total current liabilities 1,109.7   1,179.2
LONG-TERM DEBT 4,821.8   4,340.5
DEFERRED CREDITS AND OTHER LIABILITIES      
Accrued benefit obligations 163.5   172.7
Deferred income taxes 1,335.3   1,300.8
Deferred investment tax credits 10.9   11.3
Regulatory liabilities 1,030.5   1,061.6
Other 262.4   213.0
Total deferred credits and other liabilities 2,802.6   2,759.4
Total liabilities 8,734.1   8,279.1
COMMITMENTS AND CONTINGENCIES (NOTE 12)  
STOCKHOLDERS' EQUITY      
Common stockholders' equity 1,156.5   1,145.1
Retained earnings 3,324.4   3,373.7
Accumulated other comprehensive loss, net of tax (3.2)   (7.2)
Total stockholders' equity 4,477.7   4,511.6
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 13,211.8   12,790.7
OG&E [Member]      
CURRENT ASSETS      
Cash and cash equivalents 0.1   0.2
Accounts receivable 219.3   208.8
Accrued unbilled revenues 108.9   72.7
Fuel inventories 145.5   158.5
Materials and supplies, at average cost 238.6   254.3
Other 59.6   46.7
Total current assets 772.0   741.2
OTHER PROPERTY AND INVESTMENTS      
Total other property and investments 4.5   4.6
PROPERTY, PLANT AND EQUIPMENT      
In service 15,904.6   15,582.1
Construction work in progress 689.1   522.2
Total property, plant and equipment 16,593.7   16,104.3
Less: accumulated depreciation 4,912.5   4,809.4
Net property, plant and equipment 11,681.2   11,294.9
DEFERRED CHARGES AND OTHER ASSETS      
Regulatory assets 586.2   577.6
Other 29.2   24.3
Total deferred charges and other assets 615.4   601.9
TOTAL ASSETS 13,073.1   12,642.6
CURRENT LIABILITIES      
Accounts payable 228.1   228.5
Advances from parent 165.5   147.7
Customer deposits 107.8   103.5
Accrued taxes 47.3   47.2
Accrued interest 57.4   56.6
Accrued compensation 39.7   37.0
Long-term debt due within one year 79.4   0.0
Fuel clause over recoveries 29.8   20.5
Other 41.3   43.6
Total current liabilities 796.3   684.6
LONG-TERM DEBT 4,415.3   4,290.6
DEFERRED CREDITS AND OTHER LIABILITIES      
Accrued benefit obligations 97.3   96.2
Deferred income taxes 1,374.9   1,340.8
Deferred investment tax credits 10.9   11.3
Regulatory liabilities 1,030.5   1,061.6
Other 232.1   182.8
Total deferred credits and other liabilities 2,745.7   2,692.7
Total liabilities 7,957.3   7,667.9
COMMITMENTS AND CONTINGENCIES (NOTE 12)  
STOCKHOLDERS' EQUITY      
Common stockholders' equity 1,584.3   1,577.7
Retained earnings 3,531.5   3,397.0
Total stockholders' equity 5,115.8   4,974.7
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 13,073.1   $ 12,642.6