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INCOME TAXES - Reconciliations to Federal Income Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Net Income | $ 2,975.8 | $ 2,212.6 | $ 2,305.6
Less: Equity Earnings | (93.7) | (58.5) | 109.4
Income Tax Expense (Benefit) | (39.2) | 54.6 | 5.4
Pretax Income | 2,935.2 | 2,265.8 | 2,309.6
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 616.5 | $ 475.8 | $ 485.0
Statutory rate | 21.00% | 21.00% | 21.00%
Increase (Decrease) in Income Taxes Resulting from the Following Items: |  |  |
Reversal of Origination Flow-Through | $ 20.5 | $ 26.0 | $ 17.1
Investment Tax Credit Amortization | (58.4) | (50.3) | (14.3)
Production Tax Credits | (214.2) | (175.2) | (197.1)
State and Local Income Taxes, Net | 16.7 | 43.7 | (14.0)
Removal Costs | (14.6) | (22.0) | (26.5)
AFUDC Equity | (46.5) | (39.8) | (29.3)
Tax Reform Excess ADIT Reversal | (91.6) | (151.1) | (214.5)
Remeasurement of Excess ADIT | (262.2) | (46.0) |
Federal Return to Provision |  | 0.0 | (17.4)
Disallowance Cost |  | 0.0 |
Other | (5.4) | (6.5) | 16.4
Income Tax Expense (Benefit) | $ (39.2) | $ 54.6 | $ 5.4
Effective Income Tax Rate | (1.30%) | 2.40% | 0.20%
Dolet Hills Lignite Co, LLC |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Less: Equity Earnings | $ (1.4) | $ (1.4) | $ (1.4)
AEP TEXAS INC. |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Net Income | 420.1 | 370.4 | 307.9
Income Tax Expense (Benefit) | 102.1 | 85.9 | 72.6
Pretax Income | 522.2 | 456.3 | 380.5
Income Taxes on Pretax Income at Statutory Rate (21%) | 109.7 | 95.8 | 79.9
Increase (Decrease) in Income Taxes Resulting from the Following Items: |  |  |
Reversal of Origination Flow-Through | 0.8 | 0.6 | 0.0
Investment Tax Credit Amortization | (0.9) | (0.7) | 0.0
Production Tax Credits | 0.0 | 0.0 | 0.0
State and Local Income Taxes, Net | 2.3 | 2.1 | 1.7
Removal Costs | 0.0 | 0.0 | 0.0
AFUDC Equity | (9.6) | (6.0) | (4.1)
Tax Reform Excess ADIT Reversal | (5.1) | (6.0) | (5.5)
Remeasurement of Excess ADIT | 6.4 | 0.0 |
Federal Return to Provision |  | (0.1) | 0.0
Disallowance Cost |  | 0.0 |
Other | (1.5) | 0.2 | 0.6
Income Tax Expense (Benefit) | $ 102.1 | $ 85.9 | $ 72.6
Effective Income Tax Rate | 19.60% | 18.80% | 19.10%
AEP TEXAS INC. | Investment funds |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Less: Equity Earnings | $ 0.0 | $ 0.0 | $ 0.0
AEP TRANSMISSION COMPANY, LLC |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Net Income | 688.4 | 614.2 | 594.2
Income Tax Expense (Benefit) | 190.3 | 147.1 | 169.1
Pretax Income | 878.7 | 761.3 | 763.3
Income Taxes on Pretax Income at Statutory Rate (21%) | 184.5 | 159.9 | 160.3
Increase (Decrease) in Income Taxes Resulting from the Following Items: |  |  |
Reversal of Origination Flow-Through | 2.7 | 2.4 | 0.0
Investment Tax Credit Amortization | 0.0 | 0.0 | 0.0
Production Tax Credits | 0.0 | 0.0 | 0.0
State and Local Income Taxes, Net | 20.5 | 0.7 | 19.8
Removal Costs | 0.0 | 0.0 | 0.0
AFUDC Equity | (18.8) | (17.5) | (14.8)
Tax Reform Excess ADIT Reversal | 1.6 | 1.7 | 0.0
Remeasurement of Excess ADIT | 0.0 | 0.0 |
Federal Return to Provision |  | 0.0 | 0.0
Disallowance Cost |  | 0.0 |
Other | (0.2) | (0.1) | 3.8
Income Tax Expense (Benefit) | $ 190.3 | $ 147.1 | $ 169.1
Effective Income Tax Rate | 21.70% | 19.30% | 22.20%
AEP TRANSMISSION COMPANY, LLC | Investment funds |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Less: Equity Earnings | $ 0.0 | $ 0.0 | $ 0.0
APPALACHIAN POWER COMPANY |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Net Income | 421.7 | 294.4 | 394.2
Income Tax Expense (Benefit) | 75.1 | 14.2 | 18.2
Pretax Income | 496.8 | 308.6 | 412.4
Income Taxes on Pretax Income at Statutory Rate (21%) | 104.3 | 64.8 | 86.6
Increase (Decrease) in Income Taxes Resulting from the Following Items: |  |  |
Reversal of Origination Flow-Through | 6.6 | 9.9 | 4.7
Investment Tax Credit Amortization | 0.1 | 0.0 | 0.0
Production Tax Credits | (0.3) | (0.1) | 0.0
State and Local Income Taxes, Net | 10.3 | 9.9 | (5.9)
Removal Costs | (11.2) | (5.1) | (9.8)
AFUDC Equity | (5.3) | (5.5) | (3.7)
Tax Reform Excess ADIT Reversal | (30.1) | (17.3) | (50.9)
Remeasurement of Excess ADIT | 0.0 | (46.0) |
Federal Return to Provision |  | 3.4 | (2.8)
Disallowance Cost |  | 0.0 |
Other | 0.7 | 0.2 | 0.0
Income Tax Expense (Benefit) | $ 75.1 | $ 14.2 | $ 18.2
Effective Income Tax Rate | 15.10% | 4.60% | 4.40%
APPALACHIAN POWER COMPANY | Investment funds |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Less: Equity Earnings | $ 0.0 | $ 0.0 | $ 0.0
INDIANA MICHIGAN POWER COMPANY |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Net Income | 391.4 | 335.9 | 324.7
Income Tax Expense (Benefit) | (95.2) | 58.6 | 4.2
Pretax Income | 296.2 | 394.5 | 328.9
Income Taxes on Pretax Income at Statutory Rate (21%) | 62.2 | 82.8 | 69.1
Increase (Decrease) in Income Taxes Resulting from the Following Items: |  |  |
Reversal of Origination Flow-Through | 4.0 | 6.4 | 2.9
Investment Tax Credit Amortization | (2.0) | (1.6) | (3.1)
Production Tax Credits | (69.0) | 0.0 | 0.0
State and Local Income Taxes, Net | 5.5 | 17.5 | 9.6
Removal Costs | (3.7) | (11.8) | (12.4)
AFUDC Equity | (2.8) | (2.3) | (2.1)
Tax Reform Excess ADIT Reversal | (15.5) | (30.0) | (54.0)
Remeasurement of Excess ADIT | (73.3) | 0.0 |
Federal Return to Provision |  | (2.5) | (6.2)
Disallowance Cost |  | 0.0 |
Other | (0.6) | 0.1 | 0.4
Income Tax Expense (Benefit) | $ (95.2) | $ 58.6 | $ 4.2
Effective Income Tax Rate | (32.10%) | 14.90% | 1.30%
INDIANA MICHIGAN POWER COMPANY | Investment funds |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Less: Equity Earnings | $ 0.0 | $ 0.0 | $ 0.0
OHIO POWER COMPANY |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Net Income | 305.6 | 328.2 | 287.8
Less: Equity Earnings | 1.1 | 0.0 | (0.6)
Income Tax Expense (Benefit) | 52.4 | 54.3 | 44.2
Pretax Income | 358.0 | 382.5 | 331.4
Income Taxes on Pretax Income at Statutory Rate (21%) | 75.2 | 80.3 | 69.6
Increase (Decrease) in Income Taxes Resulting from the Following Items: |  |  |
Reversal of Origination Flow-Through | 2.7 | 2.6 | 3.0
Investment Tax Credit Amortization | 0.1 | 0.0 | 0.0
Production Tax Credits | 0.0 | 0.0 | 0.0
State and Local Income Taxes, Net | 10.7 | 3.9 | (1.6)
Removal Costs | 0.0 | 0.0 | 0.0
AFUDC Equity | (4.9) | (3.6) | (2.9)
Tax Reform Excess ADIT Reversal | (31.1) | (28.9) | (27.5)
Remeasurement of Excess ADIT | 0.0 | 0.0 |
Federal Return to Provision |  | (0.4) | 3.5
Disallowance Cost |  | 0.0 |
Other | (0.3) | 0.4 | 0.1
Income Tax Expense (Benefit) | $ 52.4 | $ 54.3 | $ 44.2
Effective Income Tax Rate | 14.60% | 14.20% | 13.30%
OHIO POWER COMPANY | Investment funds |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Less: Equity Earnings | $ 0.0 | $ 0.0 | $ (0.6)
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Net Income | 249.3 | 208.8 | 167.6
Income Tax Expense (Benefit) | (99.6) | (53.6) | (49.2)
Pretax Income | 149.7 | 155.2 | 118.4
Income Taxes on Pretax Income at Statutory Rate (21%) | 31.4 | 32.6 | 24.9
Increase (Decrease) in Income Taxes Resulting from the Following Items: |  |  |
Reversal of Origination Flow-Through | 0.4 | 0.4 | 0.0
Investment Tax Credit Amortization | (1.4) | (1.4) | (1.6)
Production Tax Credits | (73.8) | (64.3) | (47.7)
State and Local Income Taxes, Net | (0.6) | 3.5 | 4.3
Removal Costs | 0.0 | 0.0 | 0.0
AFUDC Equity | (1.6) | (1.8) | 0.0
Tax Reform Excess ADIT Reversal | (5.5) | (23.3) | (25.4)
Remeasurement of Excess ADIT | (48.6) | 0.0 |
Federal Return to Provision |  | 0.6 | (3.7)
Disallowance Cost |  | 0.0 |
Other | 0.1 | 0.1 | 0.0
Income Tax Expense (Benefit) | $ (99.6) | $ (53.6) | $ (49.2)
Effective Income Tax Rate | (66.50%) | (34.50%) | (41.60%)
PUBLIC SERVICE COMPANY OF OKLAHOMA | Investment funds |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Less: Equity Earnings | $ 0.0 | $ 0.0 | $ 0.0
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Net Income | 325.7 | 223.8 | 294.3
Less: Equity Earnings | (1.4) | (1.4) | (1.4)
Income Tax Expense (Benefit) | (184.0) | (33.3) | (25.2)
Pretax Income | 140.3 | 189.1 | 267.7
Income Taxes on Pretax Income at Statutory Rate (21%) | 29.5 | 39.7 | 56.2
Increase (Decrease) in Income Taxes Resulting from the Following Items: |  |  |
Reversal of Origination Flow-Through | 2.1 | 2.1 | 2.3
Investment Tax Credit Amortization | (0.1) | (0.2) | 0.0
Production Tax Credits | (70.7) | (67.1) | (57.1)
State and Local Income Taxes, Net | 10.6 | (4.0) | (4.9)
Removal Costs | 0.0 | 0.0 | 0.0
AFUDC Equity | (2.8) | (2.4) | 0.0
Tax Reform Excess ADIT Reversal | (4.0) | (12.6) | (14.8)
Remeasurement of Excess ADIT | (146.8) | 0.0 |
Federal Return to Provision |  | 1.0 | 0.0
Disallowance Cost |  | 12.0 |
Other | (1.8) | (1.8) | (6.9)
Income Tax Expense (Benefit) | $ (184.0) | $ (33.3) | $ (25.2)
Effective Income Tax Rate | (131.10%) | (17.60%) | (9.40%)
SOUTHWESTERN ELECTRIC POWER COMPANY | Dolet Hills Lignite Co, LLC |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Less: Equity Earnings | $ (1.4) | $ (1.4) | $ (1.4)

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