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As Ontario’s largest clean electricity generator, see how our focus is on generating safe, efficient, and reliable energy.

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Our subsidiaries & partnerships are helping us improve electricity generation, storage, and distribution technology to electrify life in one generation.
Who we are
Powering Ontario
Ontario’s need for power never takes a rest and neither does OPG — we’re on the job 24 hours a day, seven days a week, powering Ontario.
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We maintain a long-term commitment to the health, safety and energy needs of Ontarians, and it shows in everything we do.
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We operate according to a Code of Business Conduct that ensures safety, integrity and efficiency for Ontario.
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Workers in hard hats look out from the top of an open stairway before a huge Canadian flag in a nuclear plant.

Our role in the system

Our role is to help build a stronger Ontario by investing in clean, affordable power and energy solutions that help grow Ontario's economy.

Power generation

Nuclear power
Nuclear power plays an important role in Ontario and OPG’s energy mix, and its critical to helping us achieving our net-zero goals.
Our power
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Our role in the system
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We build safety into every step of our energy production and about our comprehensive emergency preparedness plans for Ontarians.
Our commitment to safety
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The pristine turbine hall at Darlington Nuclear Generating Station.

Darlington refurbishment project

Once complete, this project will enable production of clean, safe, low-cost, and emission-free electricity from Darlington for 30 more years.

Projects & services

Darlington SMR
The Darlington site is the only location in Canada licenced for new nuclear with a completed and accepted Environmental Assessment.
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With an extensive portfolio of clean energy generation across North America, OPG can offer environmental credits in both Canada and the US.
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Ouimet Canyon Provincial Park, Thunder Bay, Ontario

Territorial acknowledgement

We respectfully acknowledge that our facilities are located within the traditional and treaty territory of Indigenous Nations and communities.

Community investment

The Power for Change Project was designed to give back to Ontario and to the communities where we operate, to help build a cleaner, more sustainable future for generations to come.

Communities

Territorial Acknowledgement
- Territorial Acknowledgement
  OPG respectfully acknowledges that the lands on which its generating stations and other assets are located are within the traditional and treaty territory of many Indigenous communities. Click to read more.
Central Ontario
- Central Ontario
  Central Ontario is home to 20 of our hydroelectric facilities, some of which, like our Sills Island Generating Station, have been part of their community for more than one hundred years.
Eastern Ontario
- Eastern Ontario
  Eastern Ontario is host to one gas-fired generating station and 15 of our hydroelectric generating stations on the St. Lawrence, Ottawa and Madawaska Rivers.
Northeastern Ontario
- Northeastern Ontario
  Northeastern Ontario contains 14 of our hydroelectric stations, including several we built or redeveloped through key partnerships with local Indigenous communities.
Northwestern Ontario
- Northwestern Ontario
  Northwestern Ontario hosts 11 of our hydroelectric stations as well as a former coal generating station that we converted to use biomass as fuel.
Southern Ontario - Durham Region
- Southern Ontario - Durham Region
  The golden horseshoe of Southern Ontario is home to key operations including our Darlington and Pickering nuclear stations in Clarington and Pickering.
Southern Ontario - Niagara Region
- Southern Ontario - Niagara Region
  The golden horseshoe of Southern Ontario is home to key operations including our iconic Sir Adam Beck hydroelectric stations in Niagara Falls.
Southwestern Ontario
- Southwestern Ontario
  Southwestern Ontario is host to our NSS - Western Waste Management Facility in Bruce County, our Eugenia hydroelectric station near Meaford, and our Nanticoke Solar Facility on the site of the former Nanticoke coal station.

Rough waters in the tailrace from Barrett Chute hydroelectric station.

Water system data portal

Find water level and flow information from gauges on rivers where OPG operates hydroelectric stations in Ontario.

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Net-Zero News
A quarterly round-up of stories, news and profiles that highlight our best. See how we’re electrifying life in one generation.
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At our visitor centres, the public is welcomed to see how their power is made and learn about Ontario's low-carbon electricity system.
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Our commitment to public safety includes making sure people know about the dangers around our hydro stations and dams.
Water system data portal

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Media Releases

June 4, 2020

3 min read

Darlington’s refurbished Unit 2 reactor returns to service

Reactor now successfully connected to Ontario’s electricity grid with full power

Toronto – In a significant milestone for the Darlington Nuclear refurbishment project, Ontario Power Generation (OPG), along with its project partners and vendors, have successfully completed the refurbishment of Darlington Nuclear Generating Station’s Unit 2 reactor and have reconnected it to Ontario’s electricity grid at 100 per cent full power.

“This is a truly historic moment for Ontario. I want to thank our refurbishment team, project partners, vendors and construction building trades workers for more than 24 million hours worked safely and for returning Darlington’s Unit 2 reactor to the grid at a time of unprecedented circumstances,” said Ken Hartwick, OPG’s President and CEO. “This world-class project performance demonstrates the team’s expertise and their commitment to completing the four-unit refurbishment safely, with quality and on budget by end of 2026 as planned.”

“This is a tremendous achievement for OPG and our province. The refurbishment of OPG’s Darlington Nuclear Station will provide Ontario families and businesses with reliable and affordable electricity for years to come,” said Premier Doug Ford. “Thank you to the thousands of hardworking men and women for completing this first phase of the refurbishment.”

“Congratulations to OPG on this incredible milestone. The Darlington Nuclear refurbishment project is one of the world’s largest nuclear infrastructure projects and the timely completion of the Unit 2 reactor showcases Ontario’s position as a global leader in nuclear generation,” said Greg Rickford, Minister of Energy, Northern Development and Mines, and Minister of Indigenous Affairs. “OPG’s Darlington Nuclear Station is a critical part of our electricity system, producing affordable, reliable and GHG-emissions-free electricity to over two million homes each day.”

“This is a truly historic moment for Ontario. I want to thank our refurbishment team, project partners, vendors and construction building trades workers for more than 24 million hours worked safely and for returning Darlington’s Unit 2 reactor to the grid at a time of unprecedented circumstances."

Ken Hartwick, OPG’s President and CEO

The four-unit Darlington refurbishment project, which began with Unit 2 in 2016 after nearly a decade of planning and preparation, required the support of hundreds of companies and thousands of workers within OPG and from across the province. The integrated team undertook more than 765,000 training hours in the project’s leading-edge mock-up and training facility to safely shut down, defuel, disassemble and reconstruct the reactor. This in-depth training enabled the team to practice complex tasks before performing them in the field, resulting in improved efficiencies. The project’s success was also aided by innovative technology and precision tooling delivered by hundreds of Ontario manufacturers.

With Darlington’s refurbished Unit 2 now operating at full capacity, OPG is one unit closer to extending the operating life of the station and providing another 30-plus years of clean, low-cost and reliable energy for Ontarians.

The 10-year refurbishment project, which is expected to generate a total of nearly $90 billion in economic benefits for Ontario and increase employment by an average of 14,200 jobs annually across the province, also plays a significant role in Ontario’s fight against climate change.

In response to the COVID-19 pandemic, OPG postponed the commencement of Unit 3 refurbishment from its scheduled start in May 2020, allowing the unit to continue delivering electricity to the grid. Subject to the status of the pandemic, OPG is preparing to resume the hiring of skilled trades workers and begin prerequisite activities this month to safely start this next phase on the project, which will require the continued support of our key project partners: CanAtom Power Group, GE Power, ES Fox, Black and McDonald Limited and BWXT Canada.

Learn more about the Darlington Nuclear Refurbishment Project.

OPG is the largest electricity generator in the province, providing almost half of the power Ontarians rely on every day. It is also one of the most diverse generators in North America, with expertise in nuclear, hydroelectric, biomass, solar and natural gas technologies.

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For further information, please contact:

OPG Media Relations
416-592-4008 or 1-877-592-4008
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