BWRX-300
300 MWe boiling-water SMR using passive safety systems and established BWR technology.
The annual-energy and household figures are scale illustrations, not project forecasts. Change those assumptions in the reactor output calculator.
Technology snapshot
| Reactor type | Boiling water reactor |
| Coolant / heat transfer | Light water |
| Fuel | GNF2 fuel |
| Refueling | 12–24 months |
| Region / market | Canada / global |
What do these attributes mean for common use cases?
This is an attribute check, not a project recommendation. Site, grid, licensing, fuel, security and economics still need project-specific analysis.
| Common question | What this design data says |
|---|---|
| Grid electricity? | 300 MWe electrical nameplate in the current design snapshot. |
| Useful heat? | Yes — the design is presented here with heat-use potential. |
| Remote / isolated deployment? | Not a primary small/remote scale signal. |
| Transportable system? | No — this profile treats it as a fixed-site design. |
| Current programme phase? | Under construction Under construction |
Programme status
Under construction. First unit under construction at Darlington, Ontario.
Darlington New Nuclear Project.
Closest designs by electrical output
These are the three nearest entries in the Nuclear Planner dataset on a ratio-based MWe scale. They are not claimed to be technical substitutes.
Source and verification
Primary / authoritative source used for this snapshot →
World Nuclear Association lists 300 MWe gross and 870 MWt; Darlington SMR-1 construction started 26 June 2026.
Verified 2026-09-21. If the programme has moved since then, use the linked source as the current authority.