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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN MEMBER’S EQUITY - AEP Transmission Holdco - USD ($) $ in Millions | Total | Paid-in Capital | Retained Earnings | Noncontrolling Interests | AEPTCo | AEPTCo Paid-in Capital | AEPTCo Retained Earnings | AEPTCo Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2023 |  |  |  |  | $ 6,333.3 | $ 3,043.4 | $ 3,289.9 | $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Capital Contribution from AEP Member |  |  |  |  | 25.0 | 25.0 |  |
Dividends Paid to AEP Member |  |  |  |  | (40.0) |  | (40.0) |
Net Income | $ 1,005.7 |  | $ 1,003.1 | $ 2.6 | 181.2 |  | 181.2 |
Ending balance at Mar. 31, 2024 |  |  |  |  | 6,499.5 | 3,068.4 | 3,431.1 | 0.0
Beginning balance at Dec. 31, 2023 |  |  |  |  | 6,333.3 | 3,043.4 | 3,289.9 | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net Income | 1,348.2 |  |  |  | 356.9 |  |  |
Ending balance at Jun. 30, 2024 |  |  |  |  | 6,653.8 | 3,078.0 | 3,575.8 | 0.0
Beginning balance at Mar. 31, 2024 |  |  |  |  | 6,499.5 | 3,068.4 | 3,431.1 | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Capital Contribution from AEP Member |  |  |  |  | 9.6 | 9.6 |  |
Dividends Paid to AEP Member |  |  |  |  | (31.0) |  | (31.0) |
Net Income | 342.5 |  | 340.3 | 2.2 | 175.7 |  | 175.7 |
Ending balance at Jun. 30, 2024 |  |  |  |  | 6,653.8 | 3,078.0 | 3,575.8 | 0.0
Beginning balance at Dec. 31, 2024 |  |  |  |  | 6,950.9 | 3,100.6 | 3,850.3 | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Capital Contribution from AEP Member |  |  |  |  | 32.5 | 32.5 |  |
Dividends Paid to AEP Member |  |  |  |  | (42.5) |  | (42.5) |
Net Income | 802.2 |  | 800.2 | 2.0 | 211.5 |  | 211.5 |
Ending balance at Mar. 31, 2025 |  |  |  |  | 7,152.4 | 3,133.1 | 4,019.3 | 0.0
Beginning balance at Dec. 31, 2024 |  |  |  |  | 6,950.9 | 3,100.6 | 3,850.3 | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net Income | 2,090.5 |  |  |  | 828.0 |  |  |
Ending balance at Jun. 30, 2025 |  |  |  |  | 7,724.3 | 4,931.9 | 1,739.3 | 1,053.1
Beginning balance at Mar. 31, 2025 |  |  |  |  | 7,152.4 | 3,133.1 | 4,019.3 | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Capital Contribution from AEP Member |  |  |  |  | 8.3 | 8.3 |  |
Dividends Paid to AEP Member |  |  |  |  | (2,835.8) |  | (2,835.8) |
Net Income | 1,288.3 |  | $ 1,225.8 | 62.5 | 616.5 |  | 555.8 | 60.7
Midwest Transmission Holdings Noncontrolling Interest Transaction | $ 2,782.9 | $ 1,790.5 |  | $ 992.4 | 2,782.9 | 1,790.5 |  | 992.4
Ending balance at Jun. 30, 2025 |  |  |  |  | $ 7,724.3 | $ 4,931.9 | $ 1,739.3 | $ 1,053.1

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