First Western SMR construction approved
2025-05GE Vernova Hitachi / OPG
BWRX-300 construction approved at OPG's Darlington site in Ontario, Canada.
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GE Vernova Hitachi
Profile
BWRX-300 SMR; first Western unit under construction at OPG Darlington (Canada).
Editorial profile — compiled by us from public sources.
- Headquarters
- Cambridge, MA, US
Current standings
Standings and milestones are always verified by us against primary sources, regardless of who manages the profile.
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Roadmap & milestones
First North American SMR reactor basemat installed
2026-05OPG / GE Hitachi
OPG set the ~953-tonne basemat foundation module 35 m below ground for the first of four BWRX-300 units at Darlington — North America's (and the G7's) first SMR build, targeting grid connection by 2030.
First US construction permit for a commercial small modular reactor
2026-09-28TVA / GE Vernova Hitachi BWRX-300 — Clinch River, Tennessee
The NRC issued the Tennessee Valley Authority a construction permit for a 300 MW BWRX-300 at its Clinch River site in Oak Ridge at the end of September 2026 — the first US construction authorisation for a commercial small modular reactor, and the first held by a utility rather than a reactor developer. The review took 14 months from TVA's April 2025 application, about four months ahead of the NRC's own schedule. A construction permit is not an operating licence: TVA must build the plant and obtain a separate licence before loading fuel. TVA has said the site could host up to four units; the design's first unit anywhere is Ontario Power Generation's Darlington project, targeted for 2030.
First Western SMR online (target)
~ 2030GE Vernova Hitachi / OPG
Darlington Unit 1 targeted to complete by the end of 2030.
