Thomson
Carlton County, Minnesota · EIA plant ID 1901 · Operator: ALLETE, Inc.
Nameplate73MWSummer 76 MW
Generators6in service
Net generation198GWh12 mo to Dec 2025
Capacity factor30%hydro units, summer MW
Heat rate—thermal plants only
First online1907
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 261.8 | 41.9% | — |
| 2002 | 305.6 | 48.9% | — |
| 2003 | 212.7 | 34.1% | — |
| 2004 | 232.5 | 37.1% | — |
| 2005 | 241.9 | 38.7% | — |
| 2006 | 167.3 | 26.8% | — |
| 2007 | 236.6 | 37.9% | — |
| 2008 | 270.4 | 43.2% | — |
| 2009 | 223.6 | 35.9% | — |
| 2010 | 197.9 | 31.7% | — |
| 2011 | 212.6 | 34.1% | — |
| 2012 | 131.8 | 21.3% | — |
| 2014 | 11.4 | 1.8% | — |
| 2015 | 199 | 31.3% | — |
| 2016 | 417.4 | 62.4% | — |
| 2017 | 477.9 | 71.6% | — |
| 2018 | 355.8 | 53.3% | — |
| 2019 | 371.5 | 55.7% | — |
| 2020 | 290 | 43.3% | — |
| 2021 | 184.7 | 27.7% | — |
| 2022 | 333.7 | 50.0% | — |
| 2023 | 258.7 | 38.8% | — |
| 2024 | 290.5 | 43.4% | — |
| 2025 | 198.2 | 29.7% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 13 | 12.5 | Jan 1907 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 13 | 12.5 | Jan 1907 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 13 | 12.5 | Jan 1907 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 10.8 | 12.1 | Jan 1914 | Operating | — | coming soon |
| 5 | Conventional Hydroelectric | HY | 10.8 | 11.9 | Jan 1919 | Operating | — | coming soon |
| 6 | Conventional Hydroelectric | HY | 12 | 14.7 | Jan 1949 | Operating | — | coming soon |
Owner / operator
Operator: ALLETE, Inc.. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| ALLETE, Inc. | 100.0% | 73 MW |
Nearby plants
Within 80 km.
| Fond Du Lac | 12 MW | 3.3 km |
| MP CSG 1 LLC | 1 MW | 5.8 km |
| Scanlon | 2 MW | 9 km |
| Sappi Cloquet Mill | 95 MW | 10.7 km |
| Knife Falls | 2 MW | 11.9 km |
| Duluth Paper Mill | retired | 15.8 km |