Global Top 10 Geothermal Power Countries at Year-End 2025
Global Top 10 geothermal power countries by installed capacity at year-end 2025 (MW)
Alexander Richter
12 Jan 2026
Global geothermal power capacity reached 17,173 MW by year-end 2025. ThinkGeoEnergy reviews the Top 10 geothermal countries and key market developments.
It is the beginning of the year and time to publish our much expected annual Global Top 10 list of geothermal countries. Global geothermal power capacity reached 17,173 MW by the end of 2025, reflecting continued but modest growth driven by incremental plant additions and data revisions across key markets.
As part of ThinkGeoEnergy’s ongoing effort to provide transparent, data-driven insight into global geothermal development, we present our updated Top 10 Geothermal Countries ranking based on installed geothermal power generation capacity as of year-end 2025. The update reflects both newly commissioned capacity during 2025 and several data corrections identified through continued project-level tracking.
By the end of the year, geothermal power generation was active in 35 countries worldwide. Total installed capacity increased by 223 MW during 2025. Compared with our previously published year-end 2024 total, the net increase appears higher at around 300 MW due to corrections, most notably the inclusion of New Zealand’s Te Huka Unit 3, which entered operation at the very end of 2024 but was not captured in last year’s dataset.
Top 10 geothermal countries – year-end 2025
- United States – 3,953 MW
The United States remains the world’s largest geothermal power producer. Capacity figures saw only minor technical adjustments in 2025, with no major new plants commissioned during the year. - Indonesia – 2,742 MW
Indonesia recorded the largest capacity additions in 2025. New generation came from the Ijen Unit 1 project, Lumut Balai Unit 2, and a binary unit at Salak, reinforcing Indonesia’s position as the fastest-growing large geothermal market globally. - Philippines – 2,034 MW
The Philippines added incremental capacity through the Tanawon binary plant at the BacMan II complex, continuing its strategy of optimizing existing geothermal fields. - Türkiye – 1,797 MW
Türkiye commissioned three new power plants during 2025, including Emir, Hez Morali, and Nezihe Beren Unit 2. The country remains Europe’s largest geothermal power producer. - New Zealand – 1,259 MW
New Zealand’s figures were revised upward to include Te Huka Unit 3, which entered operation shortly before the end of 2024. No additional grid-connected capacity was added in 2025. The new TOPP 2 geothermal plant began test operations but had not officially connected to the grid by year-end. - Kenya – 980 MW
Kenya’s installed capacity remained unchanged in 2025. Development activity continues at several sites, but no new units were commissioned during the year. - Mexico – 976 MW
Mexico’s geothermal capacity also remained stable, with no confirmed new additions reported during 2025. - Italy – 916 MW
Italy’s installed capacity remained unchanged following the data corrections applied in previous years. - Iceland – 808 MW
Iceland added 22 MW of new capacity through an expansion at the Svartsengi geothermal power plant, reflecting continued incremental development within existing fields. - Japan – 607 MW
Japan’s geothermal capacity saw no changes in 2025, following the smaller additions recorded in previous years.
Together, these ten countries account for more than 93 percent of global installed geothermal power capacity, underlining the continued concentration of development within a relatively small group of mature geothermal markets.
Sector growth remains steady but gradual
While global geothermal capacity continues to grow, the pace of expansion remains modest. Additions in 2025 were dominated by expansions and incremental projects rather than large, greenfield developments. In Central America and the Caribbean, there was at least some movement during the year. El Salvador saw the long-awaited addition of an 8 MW binary unit at the Berlin geothermal field, while the geothermal power plant in Dominica moved closer to operation with a targeted start of operation in March 2026. At this point we also cannot confirm the official COD of the Topp 2 geothermal plant in New Zealand.
The capacity figures also continue to lag behind broader technological developments in the sector. Advanced geothermal technologies, including Enhanced Geothermal Systems (EGS) and closed-loop or Advanced Geothermal Systems (AGS), are not yet reflected in installed capacity statistics. In 2025, Eavor brought its first commercial closed-loop pilot project online, while Fervo Energy continued progress toward its first commercial-scale EGS power plant in Utah, scheduled to begin operations in 2026.
As discussed in ThinkGeoEnergy’s year-end sector review, published ahead of the close of 2025, the geothermal industry is navigating a period of steady progress combined with structural challenges related to financing, drilling risk, and project timelines. New technologies are advancing, but their impact on global capacity figures is likely to remain limited in the near term.
Looking ahead, 2026 is expected to see continued incremental growth, with early commercial EGS projects beginning to enter operation. A more pronounced increase in global installed capacity is more likely to materialize from 2027 onward, as advanced geothermal projects move beyond the pilot stage and into scalable deployment.
In the next weeks, we will also release our Global Geothermal Power Snapshot 2026, so stay tuned. We appreciate sharing of our top 10 as well as an attribution of data we share, just like here by the Utah Forge project.
