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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL MATTERS (Details) $ in Millions | 1 Months Ended | 9 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2022 micrograms | Mar. 31, 2022 micrograms | Jun. 30, 2021 area | Dec. 31, 2020 micrograms performance_obligations | Sep. 30, 2022 USD ($) generating_units States performance_obligations MW | Mar. 31, 2019 MW | Dec. 31, 2021 USD ($) | Oct. 31, 2021 performance_obligations
Manufactured gas plant remediation |  |  |  |  |  |  |  |
Regulatory assets | $ |  |  |  |  | $ 3,251.2 |  | $ 3,367.1 |
Environmental remediation costs |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |
Regulatory assets | $ |  |  |  |  | $ 616.3 |  | 630.9 |
Cross State Air Pollution Rule - Good Neighbor Plan | Electric |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |
Number of states the EPA is proposing to update and expand cross state air pollution rules to regulate NOx emissions in | States |  |  |  |  | 26 |  |  |
Cross State Air Pollution Rule - Good Neighbor Plan | Electric | Maximum |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |
RICE unit megawatts | MW |  |  |  |  | 25 |  |  |
National Ambient Air Quality Standards | Electric |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |
Number of changes to the 2015 ozone standards | performance_obligations |  |  |  |  |  |  |  | 0
Number of counties to have boundaries revised | area |  |  | 13 |  |  |  |  |
Number of nonattainment areas as designated by the EPA | area |  |  | 6 |  |  |  |  |
Number of revisions necessary to meet the 2012 standard for particulate matter | performance_obligations |  |  |  | 0 |  |  |  |
Current number of micrograms per cubic meter that particulate matter needs to be below |  |  |  | 12 |  |  |  |
24-hour standard for fine particulate matter |  |  |  | 35 |  |  |  |
Lowest limit that will cause nonattainment |  | 10 |  |  |  |  |  |
National Ambient Air Quality Standards | Electric | Maximum |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |
Majority of CASAC members support this range in the peer review they completed |  | 10 |  |  |  |  |  |
Minority of CASAC members support this range in the peer review they completed |  | 11 |  |  |  |  |  |
Upper range of the annual standard the EPA staff supported | 12 |  |  |  |  |  |  |
Lower range of the annual standard the EPA staff supported | 10 |  |  |  |  |  |  |
National Ambient Air Quality Standards | Electric | Minimum |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |
Majority of CASAC members support this range in the peer review they completed |  | 8 |  |  |  |  |  |
Minority of CASAC members support this range in the peer review they completed |  | 10 |  |  |  |  |  |
Upper range of the annual standard the EPA staff supported | 10 |  |  |  |  |  |  |
Lower range of the annual standard the EPA staff supported | 8 |  |  |  |  |  |  |
Climate Change | Electric |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |
Capacity of coal-fired generation retired, in megawatts | MW |  |  |  |  |  | 1,800 |  |
Capacity of fossil-fueled generation to be retired by the end of 2026, in megawatts | MW |  |  |  |  | 1,600 |  |  |
Company goal for percentage of carbon emissions reduction below 2005 levels by the end of 2025 |  |  |  |  | 60.00% |  |  |
Company goal for percentage of carbon emissions reduction below 2005 levels by the end of 2030 |  |  |  |  | 80.00% |  |  |
Clean Water Act Cooling Water Intake Structure Rule | Electric |  |  |  |  |  |  |  |
Water quality |  |  |  |  |  |  |  |
Number of generating units that may be retired | generating_units |  |  |  |  | 4 |  |  |
Steam Electric Effluent Limitation Guidelines | Electric |  |  |  |  |  |  |  |
Water quality |  |  |  |  |  |  |  |
Number of new ELG rule requirements that affect our electric utilities | performance_obligations |  |  |  |  | 2 |  |  |
Capital investment to achieve required discharge limits | $ |  |  |  |  | $ 100.0 |  |  |
Manufactured Gas Plant Remediation | Natural gas |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |
Reserves for future environmental remediation | $ |  |  |  |  | 497.7 |  | 532.6 |
Manufactured Gas Plant Remediation | Natural gas | Environmental remediation costs |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |
Regulatory assets | $ |  |  |  |  | $ 616.3 |  | $ 630.9 |

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