Power plants in Oregon emit a combined 11.2M 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 | Hermiston Power Partnership | Oregon | Natural Gas | 1.7M |
| 2 | Coyote Springs | Oregon | Natural Gas | 1.6M |
| 3 | Carty Generating Station | Oregon | Natural Gas | 1.4M |
| 4 | Hermiston Generating Plant | Oregon | Natural Gas | 1.3M |
| 5 | Port Westward | Oregon | Natural Gas | 1.3M |
| 6 | Klamath Cogeneration Plant | Oregon | Natural Gas | 1.3M |
| 7 | Beaver | Oregon | Natural Gas | 1.0M |
| 8 | Coyote Springs Ii | Oregon | Natural Gas | 911.9k |
| 9 | Port Westward Unit 2 | Oregon | Natural Gas | 585.0k |
| 10 | Klamath Expansion Project | Oregon | Natural Gas | 111.1k |
| 11 | Covanta Marion Inc | Oregon | Biomass | 58.4k |
| 12 | Georgia-Pacific Wauna Mill | Oregon | Biomass | 25.0k |
| 13 | Threemile Digester | Oregon | Natural Gas | 11.8k |
| 14 | Georgia-Pacific Toledo Mill | Oregon | Biomass | 9.5k |
| 15 | Ip Springfield Oregon | Oregon | Biomass | 8.5k |
| 16 | Oregon State University Energy Center | Oregon | Natural Gas | 7.9k |
| 17 | Dillard Complex | Oregon | Biomass | 690 |
| 18 | Univ Of Oregon Central Power Station | Oregon | Natural Gas | 298 |
PowerPlantsNearMe.com. (2026). Most Polluting Power Plants in Oregon. Derived from EIA Form 860, EIA Form 923, and EPA eGRID. Retrieved from https://powerplantsnearme.com/most-polluting-power-plants/oregon
Click the citation to select it for copying. For bulk data, see the data downloads page.