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Commitments and Contingencies - Environmental Matters (Details) T in Millions, $ in Millions | 1 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2023 micrograms | Jun. 30, 2021 area | May 31, 2021 | Dec. 31, 2020 micrograms performance_obligations | Dec. 31, 2022 USD ($) micrograms performance_obligations generating_units States MW T | Mar. 31, 2019 MW | Dec. 31, 2021 USD ($)
Manufactured Gas Plant Remediation |  |  |  |  |  |  |
Regulatory asset | $ |  |  |  |  | $ 3,306.9 |  | $ 3,367.1
Estimated future cash expenditures for environmental remediation | $ |  |  |  |  | 499.6 |  | 532.6
Environmental remediation costs |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |
Regulatory asset | $ |  |  |  |  | 610.7 |  | 630.9
Estimated future cash expenditures for environmental remediation | $ |  |  |  |  | $ 499.6 |  |
Cross State Air Pollution Rule | Electric |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
Number of states the EPA is proposing more stringent regulation of ozone-season NOx emissions in | States |  |  |  |  | 26 |  |
Cross State Air Pollution Rule | Electric | Maximum |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
RICE unit megawatts | MW |  |  |  |  | 25 |  |
National Ambient Air Quality Standards | Electric |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
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 level of micrograms per cubic meter that particulate matter needs to be below |  |  |  | 12 |  |  |
Current level of micrograms per cubic meter under 24-hour standard that particulate matter needs to be below |  |  |  | 35 |  |  |
Lowest limit that will cause nonattainment |  |  |  |  | 10 |  |
National Ambient Air Quality Standards | Electric | Minimum |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
The EPA is taking comments on this full range of micrograms per cubic meter |  |  |  |  | 8 |  |
New possible number of micrograms per cubic meter that particulate matter may be lowered to |  |  |  |  | 10 |  |
National Ambient Air Quality Standards | Electric | Minimum | Subsequent event |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
Proposed primary (health-based) annual standard | 9 |  |  |  |  |  |
National Ambient Air Quality Standards | Electric | Maximum |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
The EPA is taking comments on this full range of micrograms per cubic meter |  |  |  |  | 11 |  |
New possible number of micrograms per cubic meter that particulate matter may be lowered to |  |  |  |  | 11 |  |
National Ambient Air Quality Standards | Electric | Maximum | Subsequent event |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
Proposed primary (health-based) annual standard | 10 |  |  |  |  |  |
Climate Change | Electric |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
Capacity of coal generation retired since the beginning of 2018, 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 carbon dioxide emission reduction goal by the end of 2025 |  |  | 60.00% |  |  |  |
Company goal for percentage of carbon dioxide emissions reduction below 2005 levels by the end of 2030 |  |  | 80.00% |  |  |  |
Carbon dioxide emissions | T |  |  |  |  | 19.5 |  |
Climate Change | Natural gas |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |
Carbon dioxide emissions | T |  |  |  |  | 29.3 |  |
Clean Water Act Cooling Water Intake Structure Rule | Electric |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |
Number of generating units that may be retired at OCPP | generating_units |  |  |  |  | 4 |  |
Steam Electric Effluent Guidelines | Electric |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |
Number of new ELG rule requirements that affect our electric utilities | performance_obligations |  |  |  |  | 2 |  |
Expected capital investment to be in compliance with ELG rule | $ |  |  |  |  | $ 100.0 |  |
Manufactured Gas Plant Remediation | Natural gas |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |
Estimated future cash expenditures for environmental remediation | $ |  |  |  |  | 499.6 |  | 532.6
Manufactured Gas Plant Remediation | Natural gas | Environmental remediation costs |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |
Regulatory asset | $ |  |  |  |  | $ 610.7 |  | $ 630.9
Renewables, Efficiency, and Conservation | Electric | Wisconsin |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |
Annual state renewable portfolio requirement, as a percent |  |  |  |  | 10.00% |  |
Percent of annual operating revenues used to fund renewable program |  |  |  |  | 1.20% |  |
Renewables, Efficiency, and Conservation | Electric | Wisconsin | WE |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |
Required renewable energy percent achieved |  |  |  |  | 8.27% |  |
Renewables, Efficiency, and Conservation | Electric | Wisconsin | WPS |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |
Required renewable energy percent achieved |  |  |  |  | 9.74% |  |
Renewables, Efficiency, and Conservation | Electric | Michigan |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |
Annual state renewable portfolio requirement, as a percent |  |  |  |  | 12.50% |  |
Energy optimization target, as a percent |  |  |  |  | 1.00% |  |
Percentage renewable portfolio requirement 2021 and beyond |  |  |  |  | 15.00% |  |

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