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OwnershipOwnership not confirmedNo SEC registration found; ownership not yet verified from a primary source · checked Nov 11, 2026
Commercial developmentNot yet assessedWe only state a stage once a source supports it. Having a product on sale does not show it works or makes money.
Investment accessNo accessible investment route verifiedNothing on file with the SEC shows shares offered to outside investors. · checked Nov 11, 2026

Evidence is labelled on each development below (company-reported, regulatory filing or government record), not on the company as a whole. Coverage is not an offer to invest. Private ownership does not imply available shares. Next scheduled recheck: Dec 11, 2026.

21developments published
$2.5MUS federal obligations on record
1federal awards
May 23, 2026latest development

Timeline

  1. May 23, 2026 · Project: construction

    Natrium Kemmerer Unit 1: DOE account of the permit and the start of plant construction (construction)

    Government-published
  2. Apr 23, 2026 · Project: construction

    Natrium Kemmerer Unit 1: Official start of construction on the Kemmerer Unit 1 plant (after the construction permit) (construction)

    Company-published
  3. Mar 9, 2026 · Project: permissions

    Natrium Kemmerer Unit 1: Construction Permit No. CPAR-1, Kemmerer Power Station Unit 1, immediately effective (not an operating licence) (permission issued)

    Government-published
  4. Mar 9, 2026 · Project: stated target

    Natrium Kemmerer Unit 1: commercial operation targeted for 2030

    Government-published
  5. Oct 23, 2025 · Project: technical milestone

    Natrium Kemmerer Unit 1: Plant design as described in the NRC final environmental impact statement notice (design disclosed)

    Government-published
  6. Jul 2, 2025 · Project: stated target

    Natrium Kemmerer Unit 1: commercial operation targeted for 2030

    Company-published
  7. Jun 18, 2025 · Project: stated target

    Natrium Kemmerer Unit 1: permission issued targeted for 2026

    Company-published
  8. May 8, 2025 · Project: permissions

    Natrium Kemmerer Unit 1: NRC exemption allowing non-safety construction on the energy island during the permit review (not a construction permit) (permission issued)

    Company-published
  9. Jan 14, 2025 · Project: permissions

    Natrium Kemmerer Unit 1: State industrial siting permit for activities outside NRC jurisdiction (non-nuclear facilities incl. energy island) (permission issued)

    Company-published
  10. Jan 14, 2025 · Project: stated target

    Natrium Kemmerer Unit 1: permission issued targeted for December 2026

    Company-published
  11. Jun 10, 2024 · Project: construction

    Natrium Kemmerer Unit 1: Start of non-nuclear construction at the site; nuclear construction deferred until the permit (site work)

    Company-published
  12. May 21, 2024 · Project: permissions

    Natrium Kemmerer Unit 1: Construction permit application accepted for review and docketed (Docket No. 50-613) (application accepted for review)

    Government-published
  13. Mar 29, 2024 · Project: technical milestone

    Natrium Kemmerer Unit 1: Storage boost claim (power and duration; no MWh figure stated) (design disclosed)

    Company-published
  14. Mar 28, 2024 · Project: permissions

    Natrium Kemmerer Unit 1: Construction permit application, Kemmerer Power Station Unit 1 (applicant US SFR Owner, LLC, a TerraPower subsidiary) (application submitted)

    Government-published
  15. Aug 16, 2023 · Project: stated target

    Natrium Kemmerer Unit 1: commercial operation targeted for 2030

    Company-published
  16. Dec 15, 2022 · Project: stated target

    Natrium Kemmerer Unit 1: commercial operation targeted for 2028

    Secondary report
  17. Nov 16, 2021 · Project: financing

    Natrium Kemmerer Unit 1: DOE's stated plan to invest in the Natrium demonstration (licensing, construction, demonstration) (announced)

    Government-published
  18. Oct 13, 2020 · Project: financing

    Natrium Kemmerer Unit 1: DOE Advanced Reactor Demonstration Program initial award to TerraPower (cost-shared; later funding subject to appropriations) (announced)

    Government-published
  19. Date not stated · Project: stated target

    Natrium Kemmerer Unit 1: application submitted targeted for 2028

    Company-published
  20. Date not stated · Project: technical milestone

    Natrium Kemmerer Unit 1: DOE Advanced Reactor Demonstration project profile (design disclosed)

    Government-published
  21. Date not stated · Project: customer / offtake

    Natrium Kemmerer Unit 1: Intended service to PacifiCorp's Rocky Mountain Power customers (no offtake agreement described) (interest disclosed)

    Company-published

Profile

Coverage
Federal awards only

Mix of developments

Project: stated target 7Project: permissions 5Project: construction 3Project: technical milestone 3Project: financing 2Project: customer / offtake 1

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Projects on record

Projects TerraPower develops or takes a sourced role in. Each dimension of each unit moves only when a source says so; covering several projects does not imply a complete pipeline.

US federal awards

From USAspending.gov. Obligated is money the government has committed, not company revenue and not the contract’s potential ceiling. Outlays is what has actually been paid. Totals: $2.5 million obligated, $2.5 million paid out across 1 award.

AgencyDescriptionObligatedPaid outPeriodRecord
Department of EnergyTERRAPOWER, LCC: NEW ONWARDS FULLY FUNDED COOPERATIVE AGREEMENT CONTROL NUMBER: 2530-1515 PROJECT TITLE: CHLORIDE-BASED VOLATILITY FOR WA…$2.5 million$2.5 millionAug 5, 2022 – Dec 31, 2024USAspending ↗