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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL MATTERS (Details) T in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) micrograms MW | Jun. 30, 2021 area | Dec. 31, 2020 USD ($) micrograms performance_obligations | Jun. 30, 2020 generating_units | Mar. 31, 2022 USD ($) States MW | Dec. 31, 2021 USD ($) T | Dec. 31, 2020 USD ($) performance_obligations | Mar. 31, 2019 MW | Oct. 31, 2021 performance_obligations
Manufactured gas plant remediation |  |  |  |  |  |  |  |  |
Regulatory assets | $ | $ 3,255.6 |  |  |  | $ 3,255.6 | $ 3,367.1 |  |  |
Environmental remediation costs |  |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |  |
Regulatory assets | $ | $ 618.8 |  |  |  | $ 618.8 | $ 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 |  |  |  |  | 25 |  |  |  |
Cross State Air Pollution Rule - Good Neighbor Plan | Electric | Maximum |  |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |  |
RICE unit megawatts | MW | 25 |  |  |  | 25 |  |  |  |
Cross State Air Pollution Rule - Good Neighbor Plan | Electric | Minimum |  |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |  |
RICE unit megawatts | MW | 15 |  |  |  | 15 |  |  |  |
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 |  |  |  |  |  |
Lowest limit that will cause non-attainment | 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 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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 2025, 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% |  |  |  |
Carbon dioxide emissions | T |  |  |  |  |  | 22.0 |  |  |
Climate Change | Natural gas |  |  |  |  |  |  |  |  |
Air quality |  |  |  |  |  |  |  |  |
Carbon dioxide emissions | T |  |  |  |  |  | 26.0 |  |  |
Clean Water Act Cooling Water Intake Structure Rule | Electric |  |  |  |  |  |  |  |  |
Water quality |  |  |  |  |  |  |  |  |
Number of generating units to 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 |  |
Additional capital investment to achieve required discharge limits | $ |  |  | $ 100.0 |  |  |  | $ 100.0 |  |
Manufactured Gas Plant Remediation | Natural gas |  |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |  |
Reserves for future environmental remediation | $ | $ 517.2 |  |  |  | $ 517.2 | $ 532.6 |  |  |
Manufactured Gas Plant Remediation | Natural gas | Environmental remediation costs |  |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |  |
Regulatory assets | $ | $ 618.8 |  |  |  | $ 618.8 | $ 630.9 |  |  |

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