Power plants in Montana emit a combined 14.2M 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 | Colstrip | Montana | Coal | 12.0M |
| 2 | Hardin Generator Project | Montana | Coal | 722.1k |
| 3 | Yellowstone Energy Lp | Montana | Oil | 451.6k |
| 4 | Colstrip Energy Lp | Montana | Coal | 447.3k |
| 5 | Dave Gates Generating Station | Montana | Natural Gas | 360.9k |
| 6 | Culbertson Generation Station | Montana | Natural Gas | 151.9k |
| 7 | Basin Creek Plant | Montana | Natural Gas | 60.8k |
| 8 | Lewis & Clark | Montana | Natural Gas | 10.8k |
| 9 | Western Sugar Cooperative - Billings | Montana | Coal | 3.6k |
| 10 | Glendive Gt | Montana | Natural Gas | 1.4k |
| 11 | Miles City Gt | Montana | Natural Gas | 336 |
PowerPlantsNearMe.com. (2026). Most Polluting Power Plants in Montana. Derived from EIA Form 860, EIA Form 923, and EPA eGRID. Retrieved from https://powerplantsnearme.com/most-polluting-power-plants/montana
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