Power plants in Idaho emit a combined 2.8M metric tons of CO₂ per year. The table below ranks the top emitters — predominantly coal and natural gas plants. Emission rates vary widely even within the same fuel type: efficient combined-cycle gas plants produce roughly 900 lb CO₂/MWh, while older coal plants can exceed 2,200 lb/MWh.
Emissions data comes from the EPA eGRID program. Zero-emission sources (nuclear, solar, wind, hydro) are excluded from this ranking. For methodology details, see the methodology page.
| # | Plant | State | Fuel | CO₂ (tons/yr) |
|---|---|---|---|---|
| 1 | Rathdrum Power Llc | Idaho | Natural Gas | 764.1k |
| 2 | Langley Gulch Power Plant | Idaho | Natural Gas | 668.9k |
| 3 | Rathdrum | Idaho | Natural Gas | 480.3k |
| 4 | Bennett Mountain | Idaho | Natural Gas | 448.0k |
| 5 | Evander Andrews Power Complex | Idaho | Natural Gas | 364.7k |
| 6 | Clearwater Paper Ipp Lewiston | Idaho | Biomass | 28.7k |
| 7 | Amalgamated Sugar Llc Nampa | Idaho | Natural Gas | 16.1k |
| 8 | Amalgamated Sugar Twin Falls | Idaho | Natural Gas | 12.0k |
| 9 | Byui Central Energy Facility | Idaho | Natural Gas | 12.0k |
| 10 | Salmon Diesel | Idaho | Oil | 56 |
PowerPlantsNearMe.com. (2026). Most Polluting Power Plants in Idaho. Derived from EIA Form 860, EIA Form 923, and EPA eGRID. Retrieved from https://powerplantsnearme.com/most-polluting-power-plants/idaho
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