TerraPower is an Advanced Nuclear Fission company founded in 2008 and based in Bellevue, USA. It has raised $1.4B in total funding, most recently a Growth in 2025.
| Date | Stage | Amount | Valuation | Lead investors |
|---|---|---|---|---|
| Jun 18, 2025 | Growth | $650M | — | NVentures, Bill Gates |
| Aug 15, 2022 | Growth | $750M | — | Bill Gates, SK Inc. |
A roundup of three U.S. power stocks riding data-center demand, following Fervo Energy's geothermal news.

U.S. Army selects five companies for $2.2B microreactor deployment at military installations, including Kairos Power, X-energy, and TerraPower.
A 345 MWe sodium-cooled fast reactor (SFR) integrated with a 1 GWh molten salt thermal energy storage system, enabling flexible power output that can surge to over 500 MW during peak demand. Under construction at the Kemmerer Power Station in Wyoming as TerraPower's demonstration project with DOE Advanced Reactor Demonstration Program support. NRC approved reactor construction in March 2026. The sodium coolant operates at low pressure, improving safety margins over water-cooled reactors.
A next-generation molten salt fast reactor where liquid chloride salt serves as both fuel carrier and coolant, operating at high temperatures with no pressurized vessel. The MCFR targets up to 1,200 MWe commercial scale and is optimized for process heat applications, long-duration thermal storage, and high electrical efficiency. TerraPower is developing the technology with DOE and Southern Company, including the Molten Chloride Reactor Experiment (MCRE) at Idaho National Laboratory to validate fuel performance.
25 patents on file, but none with both an extractable figure and an abstract on Google Patents yet.
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