Milestone notes
Milestone note Reached May 2026

First North American SMR reactor basemat installed

OPG / 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.

Auto-drafted from a verified measurement, then human-checked.

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