March 4, 2026
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NRC Issues First Commercial Reactor Construction Approval in 10 Years [pdf]
NRC OKs TerraPower’s Wyoming nuke; fans say historic, skeptics ask safety & timeline
TLDR: The U.S. nuclear regulator approved construction of TerraPower’s advanced reactor in Wyoming—the first new commercial build in 10 years. Commenters celebrated, questioned safety and speed, and mocked the 2031 target date, while hyping its energy storage feature; an operating license will still be needed.
Meet the energy plot twist of the decade: the U.S. Nuclear Regulatory Commission (NRC) just authorized a construction permit for TerraPower’s Kemmerer Unit 1 in Wyoming—the first new commercial reactor approval in 10 years, and the first non-water-cooled design in over 40. It’s a sodium-cooled “Natrium” reactor rated at 345 megawatts with energy storage to briefly boost output to 500. Hype erupted with “historic!” cheers, and commenters dropped links and nerd receipts. The speed made waves too: NRC staff finished the technical review in under 18 months. Cue the side-eye. The comment section split hard. One camp says this is the moment advanced nuclear finally catches up with reality; another camp wants answers about safety and environmental checks, and questions whether anything was rushed. The “2031” completion date became a running joke—bets flew on “2036,” “2040,” and “when Half-Life 3 ships.” Meanwhile, a power-nerd zeroed in on the storage twist, dreaming of a future where Big Tech launches energy divisions and treats nuclear like an always-on battery. Reality check: this is only a construction permit; TerraPower still needs an operating license later. For the curious, see NRC new reactor licensing.
Key Points
- •NRC authorized staff to issue a construction permit to TerraPower’s subsidiary US SFR Owner for Kemmerer Power Station Unit 1 in Kemmerer, Wyoming.
- •It is the first commercial reactor construction approval in nearly a decade and the first non-light water reactor approval in over 40 years.
- •NRC staff completed the technical review in under 18 months; the application was filed in March 2024 and formally reviewed starting May 2024.
- •The Commission approved permit issuance after a streamlined mandatory hearing; safety evaluation was issued in December 2025 and the final EIS in October 2025.
- •The 345 MWe sodium-cooled advanced reactor includes energy storage to boost output to 500 MWe; a separate operating license is required before operation.