Small modular reactors represent the most significant shift in nuclear energy technology in decades. Designed to be factory-built and transported to site, these compact reactors offer lower upfront costs, greater safety through passive systems, and flexible deployment options that could bring clean nuclear power to remote communities, industrial operations, and developing nations. Canada is positioning itself as a global leader in SMR development and deployment.
How Do SMRs Differ from Conventional Nuclear Plants?
Conventional nuclear power plants are massive, bespoke construction projects costing billions of dollars and taking a decade or more to build. SMRs, defined as reactors producing less than 300 megawatts of electrical power, are designed around modularity — standardized components manufactured in factories and assembled on site, similar to how aircraft are built. This approach promises shorter construction timelines, lower financial risk, and economies of mass production.
Many SMR designs incorporate passive safety features that rely on natural physical processes — gravity, natural circulation, and convection — rather than active systems requiring pumps and power to prevent overheating. Some designs can shut themselves down safely even if all external power and operator intervention are lost, addressing safety concerns raised by historical nuclear accidents. Understanding the physics of nuclear reactions underpins these innovative safety approaches.
What SMR Projects Are Advancing in Canada?
Canada’s nuclear regulator, the Canadian Nuclear Safety Commission, is reviewing several SMR designs. Ontario Power Generation is developing a BWRX-300 reactor at the Darlington site. The first grid-scale SMR in Canada could be operational by the late 2020s. New Brunswick is advancing the ARC-100 sodium-cooled fast reactor, while Saskatchewan is partnering on additional SMR deployment.
Remote community applications are particularly relevant for Canada. Many northern and Indigenous communities rely on expensive, polluting diesel generators for electricity and heat. SMRs designed for off-grid deployment could provide decades of clean power with minimal fuel transport requirements, addressing energy equity issues.
The nuclear waste question remains important. While some advanced SMR designs can actually use spent fuel from conventional reactors as fuel — reducing existing waste stockpiles — others produce novel waste forms that will need new management approaches. The ethical dimensions of nuclear waste management require ongoing public engagement and transparent governance. Canada’s deep geological repository project for existing nuclear waste continues to advance, informed by the broader energy transition context.
