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State

Construction

Construction is not commissioning.

Open question

What physical work is evidenced for this unit: site work, equipment, installation, mechanical completion?

  1. Current stateConstruction23 April 2026 · Company reported · TerraPower

    Before: Not established in reviewed sources. Source: TerraPower ↗

  2. Earlier statementConstruction23 May 2026 · Government record · U.S. Department of Energy, Office of Nuclear Energy

    Before: Not established in reviewed sources. Source: U.S. Department of Energy, Office of Nuclear Energy ↗

  3. Earlier statementSite work10 June 2024 · Company reported · TerraPower

    Before: Not established in reviewed sources. Source: TerraPower ↗

Evidence detail

Construction

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

Construction is not commissioning.

“TerraPower, a nuclear innovation company, today, announced the official start of construction on its flagship Natrium® plant1, Kemmerer Unit 1. Kemmerer Unit 1 is on track to be the first utility-scale advanced nuclear power plant in the United States.”
Attribution
Company reported
Publisher
TerraPower
Dated
23 April 2026
First public disclosure
23 April 2026
State before
Not established in reviewed sources
Source read
11 November 2026

Inspect primary source: TerraPower ↗

What this does and does not establish

An exact passage match shows the source says this. It does not prove the underlying claim is true.

Watch constructionInspect project history