Small modular reactors (SMRs) are a new generation of nuclear power plants designed to be factory-built, transportable, and deployable at a fraction of the size and cost of conventional nuclear facilities. With electrical capacities typically below 300 megawatts, compared to 1,000+ megawatts for traditional reactors, SMRs promise to make nuclear energy accessible to remote communities, industrial sites, and developing nations that cannot support large conventional plants. Canada has emerged as a global leader in SMR development, with multiple designs progressing through regulatory approval.
Design Innovations
SMRs incorporate design features that simplify construction and enhance safety. Many use passive safety systems that rely on natural physical processes, gravity, convection, and natural circulation, rather than active mechanical systems to prevent overheating. In the event of a malfunction, these reactors shut themselves down and cool without operator intervention or external power, addressing one of the key vulnerabilities exposed by the Fukushima disaster.
Factory fabrication is a fundamental advantage. Rather than constructing reactors on-site over a decade (typical for large plants), SMR components are manufactured in factories under controlled conditions and shipped to the installation site for assembly. This approach promises faster construction timelines, lower costs through standardisation and learning-curve effects, and higher quality control.
Canadian Leadership
Canada’s SMR Action Plan, launched in 2020, positions the country as a leader in SMR development and deployment. Several designs are progressing through the Canadian Nuclear Safety Commission’s regulatory framework. Ontario Power Generation is building Canada’s first grid-scale SMR at the Darlington Nuclear Generating Station, with operation planned for the late 2020s. New Brunswick is advancing a demonstration project using advanced molten salt technology.
For Canada’s remote northern communities, many of which rely on expensive diesel generators for electricity and heating, SMRs could provide decades of clean, reliable power. Indigenous communities are being engaged as partners in SMR planning, recognising that these projects must align with community priorities and environmental stewardship.
Applications Beyond Electricity
SMRs can provide high-temperature process heat for industrial applications that are difficult to decarbonise through electrification. Hydrogen production, desalination, district heating, oil sands processing, and chemical manufacturing can all utilise SMR thermal output. This versatility makes SMRs particularly valuable for integrated energy systems where both electricity and heat are needed.
SMRs can also complement intermittent renewable energy sources. Their ability to ramp output up and down makes them suitable partners for wind and solar installations, providing firm baseload power and filling generation gaps during periods of low renewable output.
Challenges and Debate
SMRs face challenges including nuclear waste management, public acceptance, first-of-a-kind cost uncertainty, and regulatory timelines. Critics argue that SMR cost projections are optimistic and that the technology diverts investment from renewables and storage. Nuclear waste, though smaller in volume per unit of energy than large reactor waste, still requires long-term geological disposal.
Supporters counter that achieving net-zero emissions by 2050 requires every available low-carbon technology, and that SMRs’ unique capabilities, reliable baseload power, industrial heat, and remote applicability, fill gaps that renewables alone cannot address. As the first commercial SMRs begin operation in the coming years, their real-world performance will determine whether the technology fulfils its transformative potential.
