Power plants in Hawaii emit a combined 6.3M 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 | Kahe | Hawaii | Oil | 2.2M |
| 2 | Waiau | Hawaii | Oil | 1.2M |
| 3 | Kalaeloa Cogen Plant | Hawaii | Oil | 818.5k |
| 4 | Maalaea | Hawaii | Oil | 509.8k |
| 5 | H Power | Hawaii | Biomass | 363.8k |
| 6 | Keahole | Hawaii | Oil | 199.7k |
| 7 | Campbell Industrial Park | Hawaii | Oil | 176.5k |
| 8 | Kahului | Hawaii | Oil | 170.9k |
| 9 | W H Hill | Hawaii | Oil | 149.5k |
| 10 | Kapaia Power Station | Hawaii | Oil | 142.8k |
| 11 | Hamakua Energy Plant | Hawaii | Oil | 129.0k |
| 12 | Tesoro Hawaii | Hawaii | Oil | 71.7k |
| 13 | Puna | Hawaii | Oil | 54.7k |
| 14 | Port Allen (Hi) | Hawaii | Oil | 37.1k |
| 15 | Miki Basin | Hawaii | Oil | 29.2k |
| 16 | Palaau Power Hybrid | Hawaii | Oil | 25.7k |
| 17 | Puna Geothermal Venture I | Hawaii | Geothermal | 8.6k |
| 18 | Kanoelehua | Hawaii | Oil | 8.2k |
| 19 | Schofield Generating Station | Hawaii | Biomass | 5.3k |
| 20 | Waimea | Hawaii | Oil | 1.4k |
| 21 | Biomass To Energy Facility, Kauai | Hawaii | Biomass | 152 |
| 22 | Hana Substation | Hawaii | Oil | 106 |
PowerPlantsNearMe.com. (2026). Most Polluting Power Plants in Hawaii. Derived from EIA Form 860, EIA Form 923, and EPA eGRID. Retrieved from https://powerplantsnearme.com/most-polluting-power-plants/hawaii
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