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Regulatory Matters - Summary of Utilities Rate Plans (O&R New York-Electric) (Details) - USD ($) $ in Millions | 36 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2021
NYSPSC |  |
Public Utilities, General Disclosures [Line Items] |  |
Percentage of total consolidated revenues |  | 15.00%
Percentage of debt to total consolidated debt |  | 20.00%
O&R | Electric | Scenario, Forecast |  |
Public Utilities, General Disclosures [Line Items] |  |
Authorized return on common equity (percent) | 9.20% |
Earnings sharing (percent) | 9.70% |
Common equity ratio (percent) | 48.00% |
Deferrals for property taxes limitation from rates (percent) | 90.00% |
O&R | Electric | Scenario, Forecast | Year 1 |  |
Public Utilities, General Disclosures [Line Items] |  |
Base rate changes | $ 4.9 |
Amortization to income of net regulatory assets | 11.8 |
Potential earnings adjustment mechanism incentives | 3.3 |
Net utility plant reconciliations | 1,175.0 |
Average rate base | $ 1,021.0 |
Weighted average cost of capital (after-tax) (percent) | 6.77% |
Cost of long-term debt (percent) | 4.58% |
Requested rate increase (decrease), amount | $ 11.7 |
Regulatory Asset, Amortization Period | 5 years |
Deferral, annual maximum (not more than) (percent) | 0.10% |
O&R | Electric | Scenario, Forecast | Year 1 | Maximum |  |
Public Utilities, General Disclosures [Line Items] |  |
Potential penalties (annually) | $ 4.3 |
O&R | Electric | Scenario, Forecast | Year 2 |  |
Public Utilities, General Disclosures [Line Items] |  |
Base rate changes | 16.2 |
Amortization to income of net regulatory assets | 13.5 |
Potential earnings adjustment mechanism incentives | 2.3 |
Net utility plant reconciliations | 1,198.0 |
Average rate base | $ 1,044.0 |
Weighted average cost of capital (after-tax) (percent) | 6.73% |
Cost of long-term debt (percent) | 4.51% |
Requested rate increase (decrease), amount | $ 11.7 |
Deferral, annual maximum (not more than) (percent) | 0.075% |
O&R | Electric | Scenario, Forecast | Year 2 | Maximum |  |
Public Utilities, General Disclosures [Line Items] |  |
Potential penalties (annually) | $ 4.4 |
O&R | Electric | Scenario, Forecast | Year 3 |  |
Public Utilities, General Disclosures [Line Items] |  |
Base rate changes | 23.1 |
Amortization to income of net regulatory assets | 15.2 |
Potential earnings adjustment mechanism incentives | 4.0 |
Net utility plant reconciliations | 1,304.0 |
Average rate base | $ 1,144.0 |
Weighted average cost of capital (after-tax) (percent) | 6.72% |
Cost of long-term debt (percent) | 4.49% |
Requested rate increase (decrease), amount | $ 11.7 |
Deferral, annual maximum (not more than) (percent) | 0.05% |
O&R | Electric | Scenario, Forecast | Year 3 | Maximum |  |
Public Utilities, General Disclosures [Line Items] |  |
Potential penalties (annually) | $ 5.1 |

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