Nuclear projects

Nuclear is the backbone of Ontario’s low-carbon electricity

For decades, nuclear power has been quietly supplying more than half of Ontario's electricity while releasing virtually no greenhouse gas emissions into the atmosphere. Nuclear technology has helped keep rates low while helping keep our air clean and ecosystems intact.

For Ontario to continue to benefit from this source of reliable, safe, low-cost, and carbon-free power, Ontario Power Generation (OPG) is refurbishing its nuclear assets and investing in the next generation of nuclear technology, small modular reactors (SMRs). We are also exploring the potential for developing new, large nuclear generation at our Wesleyville site, located in Port Hope. We have the talent, the supply chain, and the know-how to be North America's leaders in nuclear power.

In Ontario, nuclear power has a storied past - and an exciting future.

A digital rendering depicting OPG's new Small Modular Reactor at Darlington.

Small modular reactors

SMR. Three letters that are critical in the fight against climate change. OPG will be the first power company in North America to build an SMR and connect it to the grid at our Darlington nuclear site, with plans to build three more.

The pristine turbine hall at Darlington Nuclear Generating Station.

Darlington Refurbishment project

OPG has delivered the Darlington Refurbishment project ahead of schedule and under budget, securing clean power for Ontario for decades to come.

Wesleyville site near Port Hope

New generation at Wesleyville

In November 2024, the Ontario Government asked OPG to assess three of its existing sites, including the Wesleyville site, located in Port Hope, Ontario.

Nuclear power

Learn about how reliable, clean nuclear power is supporting Ontario's sustainable, electrified future.

A worker in protective clothing works on nuclear isotope harvesting.

Nuclear isotopes

Nuclear isotopes are used to diagnose and treat a wide variety of diseases and have applications from border security to emergency lighting. Learn about the fascinating world of nuclear isotopes and the role OPG's subsidiary, Laurentis Energy Partners, is playing as a key global supplier.  

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