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Commitments and Contingencies - Environmental Matters (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2024 MMBTU performance_obligations | Feb. 29, 2024 micrograms | Aug. 31, 2023 | May 31, 2021 | Dec. 31, 2020 micrograms | Dec. 31, 2024 USD ($) MW | Nov. 30, 2024 | Dec. 31, 2023 USD ($) | Nov. 30, 2023 Years
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |
Regulatory asset |  |  |  |  |  | $ 3,378.7 |  | $ 3,274.7 |
Estimated future cash expenditures for environmental remediation |  |  |  |  |  | 445.8 |  | 463.7 |
Environmental remediation costs |  |  |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |
Regulatory asset |  |  |  |  |  | 570.1 |  | 596.8 |
Estimated future cash expenditures for environmental remediation |  |  |  |  |  | $ 445.8 |  |  |
Cross State Air Pollution Rule | Electric | Maximum |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
RICE unit megawatts | MW |  |  |  |  |  | 25 |  |  |
Mercury and Air Toxics Standards | Electric |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Current level of particulate matter in pounds per million british thermal unit | MMBTU | 0.03 |  |  |  |  |  |  |  |
EPA new lower limit for particulate matter | MMBTU | 0.01 |  |  |  |  |  |  |  |
National Ambient Air Quality Standards | Electric |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Current level of micrograms per cubic meter that particulate matter needs to be below | micrograms |  |  |  |  | 12 |  |  |  |
Current level of micrograms per cubic meter under 24-hour standard that particulate matter needs to be below | micrograms |  |  |  |  | 35 |  |  |  |
New primary annual PM2.5 level | micrograms |  | 9 |  |  |  |  |  |  |
National Ambient Air Quality Standards | Electric | Minimum |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Period of time for EPA review of ozone plan |  |  | 3 years |  |  |  |  |  |
Number of years between evaluation of attainment status |  |  | 3 years |  |  |  |  |  |
National Ambient Air Quality Standards | Electric | Maximum |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Period of time for EPA review of ozone plan |  |  | 5 years |  |  |  |  |  |
Climate Change | Electric |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Number of applicable GHG performance standards for coal plants | performance_obligations | 0 |  |  |  |  |  |  |  |
Percent capacity factor that if combined cycle natural gas plants are above it the rule is dependent upon the implementation of carbon capture by the end of 2031 | 40.00% |  |  |  |  |  |  |  |
Number of applicable GHG performance standards for new simple cycle natural gas-fired combustion turbines | performance_obligations | 0 |  |  |  |  |  |  |  |
Percent capacity factor for simple cycle natural gas fired combustion turbines that there are no applicable limits if the capacity factor is less than this | 20.00% |  |  |  |  |  |  |  |
Capacity of fossil-fueled generation retired, in megawatts | MW |  |  |  |  |  | 2,500 |  |  |
Capacity of coal-fired generation to be retired by the end of 2031, in megawatts | MW |  |  |  |  |  | 1,200 |  |  |
Company goal for percentage of 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% |  |  |  |  |
Climate Change | Electric | Minimum |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Percent capacity factor for turbines that over this percent will require more stringent NOx limits |  |  |  |  |  |  | 20.00% |  |
Climate Change | Electric | Maximum |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
RICE unit megawatts | MW |  |  |  |  |  | 25 |  |  |
Percent capacity factor for turbines that below this percentage will have less restrictive standards |  |  |  |  |  |  | 20.00% |  |
Steam Electric Effluent Guidelines | Electric |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |
Number of new ELG rule requirements that affect our electric utilities | performance_obligations | 3 |  |  |  |  |  |  |  |
Compliance costs through 2023 associated with the ELG rule that were required to achieve discharge limits. |  |  |  |  |  |  |  | 105.0 |
Number of existing coal categories that were kept as part of the 2024 supplemental ELG rule requirements | performance_obligations | 1 |  |  |  |  |  |  |  |
Number of new coal categories that were created as part of the 2024 supplemental ELG rule requirements | performance_obligations | 1 |  |  |  |  |  |  |  |
Manufactured Gas Plant Remediation | Natural gas |  |  |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |
Estimated future cash expenditures for environmental remediation |  |  |  |  |  | $ 445.8 |  | 463.7 |
Manufactured Gas Plant Remediation | Natural gas | Environmental remediation costs |  |  |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |
Regulatory asset |  |  |  |  |  | $ 570.1 |  | $ 596.8 |
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 for 2019 and 2020, as a percent |  |  |  |  |  | 12.50% |  |  |
Annual energy optimization target, as a percent |  |  |  |  |  | 1.00% |  |  |
Percentage renewable portfolio requirement 2021 and beyond |  |  |  |  |  | 15.00% |  |  |
Required renewable energy plan filing time period | Years |  |  |  |  |  |  |  |  | 2
Percentage proposed renewable energy target through 2029 |  |  |  |  |  |  |  |  | 15.00%
Percentage proposed renewable energy target from 2030 through 2034 |  |  |  |  |  |  |  |  | 50.00%
Percentage proposed renewable energy target for 2035 and thereafter |  |  |  |  |  |  |  |  | 60.00%
Percentage proposed clean energy standards for 2035 through 2039 |  |  |  |  |  |  |  |  | 80.00%
Percentage proposed clean energy standards after 2040 |  |  |  |  |  |  |  |  | 100.00%
Required energy waste reduction plan filing time period until 2025 | Years |  |  |  |  |  |  |  |  | 2
Required energy waste reduction plan filing time period after 2025 | Years |  |  |  |  |  |  |  |  | 3

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