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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL MATTERS (Details) $ in Millions | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2023 | May 31, 2023 MW performance_obligations | Apr. 30, 2023 MMBTU | Jan. 31, 2023 micrograms | Dec. 31, 2020 micrograms performance_obligations | Sep. 30, 2023 USD ($) generating_units MW performance_obligations | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Manufactured gas plant remediation |  |  |  |  |  |  |  |  |
Regulatory assets | $ |  |  |  |  |  | $ 3,212.9 |  | $ 3,306.9 |
Environmental remediation costs |  |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |  |
Regulatory assets | $ |  |  |  |  |  | $ 577.7 |  | 610.7 |
Cross State Air Pollution Rule - Good Neighbor Plan | 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 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 |  |  |  |
Current level of micrograms per cubic meter under 24-hour standard that fine particulate matter needs to be below |  |  |  |  | 35 |  |  |  |
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 |  |  |  | 10 |  |  |  |  |
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 |  |  |  |  |
Lowest limit that will cause nonattainment |  |  |  | 10 |  |  |  |  |
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 |  |  |  | 9 |  |  |  |  |
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 |  |  |  |  |
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% |  |  |  |  |  |  |
Number of applicable limits that apply to simple cycle natural gas-fired combustion turbines that have less than a 20% capacity factor | 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% |  |  |  |  |  |  |
Rules that are being proposed for natural gas-fired stationary combustion turbines | performance_obligations |  | 1 |  |  |  |  |  |  |
Number of subcategories of stationary combustion turbine unit annual capacity factors that the proposed rule will be broken up into | performance_obligations |  | 3 |  |  |  |  |  |  |
Capacity of coal-fired generation retired, in megawatts | MW |  |  |  |  |  | 1,900 |  |  |
Capacity of fossil-fueled generation to be retired by the end of 2026, in megawatts | MW |  |  |  |  |  | 1,500 |  |  |
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% |  |  |
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 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 | $ |  |  |  |  |  | $ 105.0 |  |  |
Steam Electric Effluent Limitation Guidelines | Electric | OCPP Units 7 and 8 | WE |  |  |  |  |  |  |  |  |
Water quality |  |  |  |  |  |  |  |  |
Capital investment to achieve required discharge limits | $ |  |  |  |  |  |  |  |  | $ 8.0
Steam Electric Effluent Limitation Guidelines | Electric | Weston Unit 3 | WPS |  |  |  |  |  |  |  |  |
Water quality |  |  |  |  |  |  |  |  |
Capital investment to achieve required discharge limits | $ |  |  |  |  |  |  | $ 8.0 |  |
Steam Electric Effluent Limitation Guidelines | Electric | Elm Road Generating Station | WE |  |  |  |  |  |  |  |  |
Water quality |  |  |  |  |  |  |  |  |
Capital investment to achieve required discharge limits | $ |  |  |  |  |  | $ 89.0 |  |  | $ 89.0
Percentage of completion of the ERGS biological treatment system |  |  |  |  |  | 99.00% |  |  |
Manufactured Gas Plant Remediation | Natural gas |  |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |  |
Reserves for future environmental remediation | $ |  |  |  |  |  | $ 456.6 |  | 499.6 |
Manufactured Gas Plant Remediation | Natural gas | Environmental remediation costs |  |  |  |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  |  |  |  |  |
Regulatory assets | $ |  |  |  |  |  | $ 577.7 |  | $ 610.7 |

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