- Combustion
- Operating
- 10 · 100 · 1,000 MW
Map
- Combustion
- Operating
Weston: location. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Weston
Power plant · Coal
Key facts
Power plant · Coalran 58% of 2025 Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1981
- Net generation, 2025
- 4,842,420 MWh
- Grid
- 345 kV, 115 kV to American Transmission Co (MISO)
- Location
- Marathon County, Wisconsin
- Operated by
- Wisconsin Public Service Corp
Output
- Gas
- Coal
- Oil
Details
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- Technology
- Coal source: “Conventional Steam Coal”
- Age
- 45 years since 1981
- Unused energy
- 3,440 GWh 2025Unused energyA lead, not a guarantee: MW × hours × (1 − capacity factor) for the latest year (EIA-923), gas, coal and oil plants only. Air-permit run-hour caps, heat rate (cost to run) and capacity-market or reliability obligations can rule it out.
- Heat rate
- 9,841 Btu/kWh 2025
All 6 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
| Attribute | Value |
|---|---|
| EPA greenhouse gas reporting (GHGRP) |
|
| Fuel burned (MMBtu), 2025 | 47,655,789 |
| Capacity factor, 2025 | 0.585 |
| Heat rate (Btu/kWh), 2025 | 9,841.3 |
| Net generation (MWh), 2025 | 4,842,420.0 |
| Balancing authority code | MISO |
Retirement
EIA-860M September 2026StatusSome generators have retired; the rest of the plant is still in service. As of EIA-860M for September 2026.- Capacity retired
- 217.9 MW
- Generators retired
- 4
- Capacity still in service
- 945.5 MW
| Generator | Technology | Nameplate | State | Date |
|---|---|---|---|---|
| 1 | Conventional Steam Coal | 60 MW | Retired | June 2015 |
| 2 | Natural Gas Steam Turbine | 81.6 MW | Retired | January 2023 |
| 31 | Natural Gas Fired Combustion Turbine | 19.6 MW | Retired | June 2023 |
| 32 | Natural Gas Fired Combustion Turbine | 56.7 MW | Retired | June 2023 |
By technology
| Technology | Retired | Scheduled to retire |
|---|---|---|
| Natural Gas Steam Turbine | 81.6 MW | |
| Natural Gas Fired Combustion Turbine | 76.3 MW | |
| Conventional Steam Coal | 60 MW |
Grid
EIA-860 2025Grid fieldsAs the plant reported them to EIA-860 for 2025 (Schedule 2).- Grid voltage at the plant
- 345 kV, 115 kV
- Transmission or distribution system owner
- American Transmission Co
- Balancing authority
- Midcontinent Independent Transmission System Operator, Inc..
- NERC region
- RFC
Transmission lines within 15 mi (8)
Can the connection be reused?
A plant that retires usually leaves its substation, transmission connection and interconnection agreement behind, and those may be reusable by a new project at the same site. FERC Order No. 845 lets an interconnection customer use surplus interconnection service at an existing site, and some transmission providers' tariffs let a replacement resource take over a retiring unit's interconnection service, usually within a set time after the retirement. Whether any such right still exists here, who holds it and on what terms depends on the owner, the transmission provider and timing; this page does not establish any of that.
Ownership
3 companies5| Company | Role | Share | As of | Source |
|---|---|---|---|---|
| Wisconsin Public Service Corp | Operator | EIA-860M | ||
| WEC Energy Group | Owner | 76.0% | Dec 31, 2023 | EPA GHGRP |
| Dairyland Power Coop | Owner | 24.0% | Dec 31, 2023 | EPA GHGRP |
| Dairyland Power Coop | Owner | 18.9% | Dec 31, 2025 | EIA-860 |
| Wisconsin Public Service Corp | Owner | 44.1% | Dec 31, 2025 | EIA-860 |
Timeline
- Stated Units 31, 32 scheduled to retire, 76.3 MW · EIA-860M
- Stated Unit 2 scheduled to retire, 81.6 MW · EIA-860M
- Stated Unit 1 scheduled to retire, 60 MW · EIA-860M
- In service · EIA-860M
Sources
6 sourcesSources EIA-860M · LBNL · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory · EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT) · EIA-860 Annual Electric Generator Report — Schedule 4 Owner (ownership shares per generator), plus Plant/Generator schedules
Sources
- EIA-860M
- LBNLYin, Nait Belaid & Heleno (2026), Lawrence Berkeley National Laboratory, OEDI, CC BY 4.0: A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Modified by Inframation: HIFLD-side fields only, names re-cased, coordinates rounded.
- EIASource: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
- EIA-860M Preliminary Monthly Electric Generator Inventory
- EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)
- EIA-860 Annual Electric Generator Report — Schedule 4 Owner (ownership shares per generator), plus Plant/Generator schedules