TerraPower
| Company type | Private |
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| Industry | Nuclear power |
| Founded | 2006 |
| Founder | Bill Gates |
| Headquarters | , United States |
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| Products | Natrium Sodium-Cooled Fast Reactor, Molten Chloride Fast Reactor, Traveling wave reactor |
| Website | www |
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TerraPower, LLC is an American nuclear reactor design and development engineering company headquartered in Bellevue, Washington.
TerraPower is developing multiple designs of fast-neutron reactors, including a sodium-cooled fast reactor (SFR) and a molten-salt reactor. As of 2026, the company is constructing its Natrium SFR design in Kemmerer, Wyoming as the Kemmerer Power Station.