How many geothermal power plants are in Idaho?

1, with 16 MW of nameplate capacity between them, spread over 1 county. That is the EIA-860M operating count for 2026-07.

Is there a map of Idaho geothermal power plants?

Yes — the map above. Each dot is one geothermal power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.

Which is the largest geothermal power plant in Idaho?

Raft River Geothermal Power Plant, at 16 MW. The table is sorted largest first, so the rest follow it.

Is there a geothermal power plant near me in Idaho?

The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.

Which grid operator runs Idaho's geothermal power plants?

No single ISO or RTO covers most of them. EIA files each plant against its own balancing authority, which in Idaho is largely a vertically integrated utility rather than an organised market.

How current is this, and what is left out?

EIA-860M for 2026-07. EIA technology "Geothermal". Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.

Geothermal Power Plants in Idaho

Every operating geothermal power plant in Idaho on EIA-860M for 2026-07: 1 plants, 1 generating units and 16 MW of nameplate capacity across 1 county.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Plants: 1; 1 generating units
Nameplate capacity: 16 MW
Counties: 1
Grid operator: Mixed; no single ISO covers a majority

Map of geothermal power plants in Idaho

Every one of the 1 plants is drawn at the coordinate EIA files for it.

Loading map…

Geothermal · 1

List of geothermal power plants in Idaho

Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.

geothermal power plants in Idaho

Raft River Geothermal Power PlantGeothermal	US Geothermal Inc.	Cassia	16	1	2025	Operating

Largest geothermal power plants in Idaho

1Raft River Geothermal Power PlantCassia County, Idaho16 MW

Geothermal power plants by county in Idaho

The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.

County	Plants	Nameplate MW
Cassia	1	16

Geothermal Power Plants in Idaho: FAQ

How many geothermal power plants are in Idaho?: 1, with 16 MW of nameplate capacity between them, spread over 1 county. That is the EIA-860M operating count for 2026-07.
Is there a map of Idaho geothermal power plants?: Yes — the map above. Each dot is one geothermal power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.
Which is the largest geothermal power plant in Idaho?: Raft River Geothermal Power Plant, at 16 MW. The table is sorted largest first, so the rest follow it.
Is there a geothermal power plant near me in Idaho?: The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
Which grid operator runs Idaho's geothermal power plants?: No single ISO or RTO covers most of them. EIA files each plant against its own balancing authority, which in Idaho is largely a vertically integrated utility rather than an organised market.
How current is this, and what is left out?: EIA-860M for 2026-07. EIA technology "Geothermal". Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.