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Commitments and Contingencies - Environmental Matters (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2023 States mo | Aug. 31, 2023 | May 31, 2023 performance_obligations MW | Apr. 30, 2023 MMBTU | Jan. 31, 2023 micrograms | May 31, 2021 | Dec. 31, 2020 micrograms performance_obligations | Dec. 31, 2023 USD ($) performance_obligations MW generating_units | Feb. 07, 2024 micrograms | Nov. 30, 2023 Years | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset |  |  |  |  |  |  |  | $ 3,274.7 |  |  |  | $ 3,306.9 |
Estimated future cash expenditures for environmental remediation |  |  |  |  |  |  |  | 463.7 |  |  |  | 499.6 |
Environmental remediation costs |  |  |  |  |  |  |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset |  |  |  |  |  |  |  | 596.8 |  |  |  | 610.7 |
Estimated future cash expenditures for environmental remediation |  |  |  |  |  |  |  | $ 463.7 |  |  |  |  |
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 proposed lower limit for particulate matter | MMBTU |  |  |  | 0.01 |  |  |  |  |  |  |  |  |
Even lower level of particulate matter that the EPA is seeking opinions on | MMBTU |  |  |  | 0.006 |  |  |  |  |  |  |  |  |
National Ambient Air Quality Standards | Electric |  |  |  |  |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states that failed to submit timely SIP revisions to address nonattainment areas classified as "moderate" for the 2015 standard | States | 11 |  |  |  |  |  |  |  |  |  |  |  |
Number of months before offset sanctions take effect if the SIP is not approved | mo | 18 |  |  |  |  |  |  |  |  |  |  |  |
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 | micrograms |  |  |  |  |  |  | 12 |  |  |  |  |  |
Current level of micrograms per cubic meter under 24-hour standard that particulate matter needs to be below | micrograms |  |  |  |  |  |  | 35 |  |  |  |  |  |
National Ambient Air Quality Standards | Electric | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |  |  |  |  |
Period of time for EPA review of ozone plan |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Proposed primary (health-based) annual standard | micrograms |  |  |  |  | 9 |  |  |  |  |  |  |  |
The EPA is taking comments on this full range of micrograms per cubic meter | micrograms |  |  |  |  | 8 |  |  |  |  |  |  |  |
National Ambient Air Quality Standards | Electric | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |  |  |  |  |
Period of time for EPA review of ozone plan |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Proposed primary (health-based) annual standard | micrograms |  |  |  |  | 10 |  |  |  |  |  |  |  |
The EPA is taking comments on this full range of micrograms per cubic meter | micrograms |  |  |  |  | 11 |  |  |  |  |  |  |  |
National Ambient Air Quality Standards | Electric | Maximum | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |  |  |  |  |
New primary annual PM2.5 level | micrograms |  |  |  |  |  |  |  |  | 9 |  |  |  |
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 causes the rule to be highly dependent on hydrogen or carbon capture |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |
Rules that are being proposed for natural gas-fired stationary combustion turbines | performance_obligations |  |  | 1 |  |  |  |  |  |  |  |  |  |
Number of subcategories of combustion turbine unit annual capacity factors that the proposed rule will be broken up into | performance_obligations |  |  | 3 |  |  |  |  |  |  |  |  |  |
Capacity of coal generation retired, in megawatts | MW |  |  |  |  |  |  |  | 1,900 |  |  |  |  |
Capacity of fossil-fueled generation to be retired by the end of 2031, in megawatts | MW |  |  |  |  |  |  |  | 1,800 |  |  |  |  |
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% |  |  |  |  |  |  |
Climate Change | Electric | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |  |  |  |  |
RICE unit megawatts | MW |  |  | 25 |  |  |  |  |  |  |  |  |  |
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 Guidelines | Electric |  |  |  |  |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new ELG rule requirements that affect our electric utilities | performance_obligations |  |  |  |  |  |  |  | 2 |  |  |  |  |
Capital investment that was required to achieve discharge limits |  |  |  |  |  |  |  | $ 105.0 |  |  |  |  |
Steam Electric Effluent Guidelines | Electric | WE | OCPP Units 7 and 8 |  |  |  |  |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment that was required to achieve discharge limits |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.0
Steam Electric Effluent Guidelines | Electric | WE | Elm Road Generating Station |  |  |  |  |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment that was required to achieve discharge limits |  |  |  |  |  |  |  |  |  |  |  |  | $ 89.0
Biological treatment center costs placed in service at ERGS |  |  |  |  |  |  |  | 89.0 |  |  |  |  |
Steam Electric Effluent Guidelines | Electric | WPS | Weston 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment that was required to achieve discharge limits |  |  |  |  |  |  |  |  |  |  | $ 8.0 |  |
Manufactured Gas Plant Remediation | Natural gas |  |  |  |  |  |  |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated future cash expenditures for environmental remediation |  |  |  |  |  |  |  | 463.7 |  |  |  | 499.6 |
Manufactured Gas Plant Remediation | Natural gas | Environmental remediation costs |  |  |  |  |  |  |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset |  |  |  |  |  |  |  | $ 596.8 |  |  |  | $ 610.7 |
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% |  |  |  |  |
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 2035-2039 |  |  |  |  |  |  |  |  |  | 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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- Definition The capital and operating costs needed to achieve the required level of reduction in emissions. + References No definition available. + Details
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- Definition Even Lower Level of Particulate Matter that the EPA is seeking opinions on + References No definition available. + Details
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- Definition The capacity, in megawatts, of fossil-fueled generation capacity to be retired by the end of 2026 + References No definition available. + Details
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- Definition Represents the new primary annual PM2.5 level that the EPA finalized. + References No definition available. + Details
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- Definition Represents the number of applicable GHG performance standards applicable to Coal Plants until 2032. + References No definition available. + Details
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- Definition Number of generating units that may be retired at Oak Creek power plant prior to the WDNR making a final BTA decision. + References No definition available. + Details
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- Definition Represents the number of months before offset sanctions take effect if the SIP is not approved. + References No definition available. + Details
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- Definition The number of new ELG Requirements that affect us + References No definition available. + Details
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- Definition This represents the number of revisions necessary to the 2012 standard for particulate matter + References No definition available. + Details
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- Definition Represents the number of states that failed to submit timely SIP revisions to address nonattainment areas classified as "moderate" for the 2015 standard. + References No definition available. + Details
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- Definition Represents the number of subcategories of combustion turbine units the new source performance standards proposed rule would be broken up into. + References No definition available. + Details
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- Definition The percentage by which the company plans to reduce carbon dioxide emissions below 2005 levels by the end of 2030. + References No definition available. + Details
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- Definition The percentage by which the company plans to reduce carbon dioxide emissions below by the end of 2025 + References No definition available. + Details
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- Definition Percentage goal for electricity consumed that is generated by renewable resources. + References No definition available. + Details
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- Definition The percent of annual operating revenues used to fund the renewable program under Wisconsin Act 141. + References No definition available. + Details
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- Definition Represents the percentage proposed clean energy standards after 2040 + References No definition available. + Details
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- Definition Represents the percentage proposed clean energy standards for 2035-2039. + References No definition available. + Details
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- Definition Represents the percentage proposed renewable energy target for 2035 and thereafter. + References No definition available. + Details
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- Definition Represents the percentage proposed renewable energy target from 2030 through 2034 + References No definition available. + Details
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- Definition Represents the percentage proposed renewable energy target through 2029. + References No definition available. + Details
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- Definition Percentage goal for electricity consumed that is generated by renewable sources for years 2019 through 2020. + References No definition available. + Details
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- Definition Percentage goal for electricity consumed that is generated by renewable sources for 2021. + References No definition available. + Details
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- Definition Period of time that the EPA plans to review its Integrated Review Plan for ozone + References No definition available. + Details
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- Definition Proposed Primary (Health-Based) Annual Standard + References No definition available. + Details
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- Definition Represents the amount of a RICE Unit's Megawatt Rating + References No definition available. + Details
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- Definition Represents the renewable energy percent of the company. + References No definition available. + Details
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- Definition Represents the time period that the energy plan filing is required to be completed in. + References No definition available. + Details
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- Definition Represents the required energy waste reduction plan filing time period after 2025. + References No definition available. + Details
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