Ontario Power Generation awarded a contract to Candu Energy in May 2025 for SMR-related work at the Darlington site — supplementing the primary BWRX-300 programme with Canadian nuclear technology expertise. Candu Energy is a subsidiary of SNC-Lavalin (AtkinsRéalis) and brings decades of CANDU reactor design and engineering experience. The contract reflects OPG's strategy to maximise Canadian industrial content in its nuclear megaproject.