Ontario’s 2026 Nuclear Expansion: Why a Public Review Is Warranted

Ontario is at an important decision point. As of early 2026, the province is advancing major nuclear initiatives, including new reactors and the deployment of small modular reactors (SMRs). These proposals are often framed as essential to a clean‑energy future. Given their scale, cost, and long‑term implications, however, they merit a careful, transparent, and independent public review.

This is not an argument for or against nuclear power in principle. It is a case for due diligence: a clear‑eyed assessment of costs, risks, alternatives, and governance before committing the province to infrastructure that will shape Ontario’s energy system for generations.

1. Financial Risk and Long‑Term Commitments

Large nuclear projects are, by definition, long‑lived and capital‑intensive. Decisions made today will affect ratepayers and taxpayers for decades.

Outstanding and future costs. Ontarians are still servicing the significant public debt associated with existing nuclear facilities, while also planning for the long‑term management of radioactive waste. New projects—such as refurbishments and proposed new builds—are expected to add many billions more in capital and lifecycle costs. A public review would allow these projections to be examined alongside alternative energy pathways.

Risk allocation. Under federal nuclear liability legislation, industry liability in the event of a serious accident is capped. While such events are unlikely, their potential consequences—particularly for drinking‑water sources—are severe. It is reasonable for the public to ask how risks are distributed between private operators and the public, and whether current arrangements reflect societal expectations.

Opportunity costs. Committing tens of billions of dollars to a centralized nuclear strategy may limit investment in other options, including conservation, demand management, distributed renewables, storage, and flexible generation. Natural gas, while a fossil fuel that must be used prudently, benefits from existing infrastructure, no left over waste for landfills like nuclear, incineration and coal; and well‑established regulatory oversight. A transparent review would allow a balanced comparison of these choices, including their costs, risks, and emissions profiles.

2. Great Lakes Stewardship and Environmental Protection

Ontario’s nuclear facilities rely heavily on the Great Lakes for cooling water and waste assimilation. These lakes are among the most important freshwater resources in the world, supporting drinking water, fisheries, recreation, and regional economies.

Operational impacts. Nuclear plants require large water withdrawals and discharge heated effluent back into receiving waters. Even when permitted, thermal and chemical discharges can affect local aquatic ecosystems. Ongoing monitoring and enforcement are essential, and a broader review could assess cumulative impacts over time.

Radioactive substances and public confidence.

Past incidents involving radioactive releases, such as tritium leaks, have raised public concern, particularly when regulatory responses appear limited or slow. Historical public health recommendations to lower acceptable tritium levels in drinking water remain a point of debate. Addressing these issues openly would help rebuild trust and ensure that health protection remains paramount.

Waste management. From low‑level to high‑level radioactive waste, nuclear power requires secure, long‑term storage solutions. Communities hosting waste facilities understandably seek clear language, rigorous assessments, and meaningful participation in decisions that may affect their lands and waters for centuries.

3. Governance, Transparency, and Public Participation

Sound energy policy depends not only on technical analysis, but also on strong democratic processes.

Environmental assessment exemptions.

Recent regulatory approaches have exempted certain energy plans from comprehensive provincial environmental assessments. As a result, long‑term nuclear commitments may proceed without a single, integrated evaluation of their economic, environmental, and social implications.

Public voice in decision‑making.

Opportunities for public input before regulatory bodies are often limited in time and scope, and licensing periods have lengthened significantly over the past decade. While efficiency is important, it should not come at the expense of accountability or meaningful public engagement.

A public review—conducted through established institutions such as the Ontario Energy Board and environmental assessment processes—would strengthen confidence that decisions are being made in the public interest.

4. Lessons from Past Reviews and International Experience

Ontario and other jurisdictions have previously recognized the value of independent scrutiny of nuclear proposals. Earlier reviews, both in Canada and abroad, highlighted persistent challenges: unresolved long‑term waste disposal, high capital costs, and limited flexibility in rapidly evolving electricity systems.

Globally, many energy markets have diversified toward portfolios that emphasize modularity, adaptability, and shorter investment horizons. These trends do not preclude nuclear power, but they underscore the importance of comparing it honestly with alternatives under current conditions.

Conclusion: A Call for Informed, Public Deliberation

Ontario’s energy choices will shape public finances, environmental outcomes, and community well‑being for decades to come. Before committing to another generation of nuclear infrastructure—potentially exceeding $100 billion over its full lifecycle—it is both prudent and responsible to pause and evaluate.