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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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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.

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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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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.

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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

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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.

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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
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  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
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  Northeastern Ontario contains 14 of our hydroelectric stations, including several we built or redeveloped through key partnerships with local Indigenous communities.
Northwestern Ontario
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  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
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  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
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  The golden horseshoe of Southern Ontario is home to key operations including our iconic Sir Adam Beck hydroelectric stations in Niagara Falls.
Southwestern Ontario
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  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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May 13, 2020

2 min read

The journey to Darlington Unit 2 refurbishment

A first, historic step for the province

The Darlington Nuclear Generating Station has been a reliable source of power for the province for more than 30 years. In October 2016, after a decade of planning and preparations, OPG and our project partners took the first step on a historic, 10-year journey towards extending the lifetime of the power plant and providing another 30 years of low-cost, reliable and clean energy for Ontarians.

Throughout Unit 2 refurbishment, the project team worked hand in hand with thousands of workers and hundreds of suppliers from across the province to safely deliver on our commitment. Along the way, we incorporated lessons learned from both successes and challenges; developed innovations that improved efficiencies; and, towards the end, adapted to changing conditions in response to the global COVID-19 pandemic. This agile and focused approach ensured each complex task was completed safely and with quality.

In June 2020, following more than three years in the execution phase, we successfully reconnected Unit 2 to Ontario’s grid at 100% full power, returning the first newly refurbished reactor to service a month ahead of our revised schedule.

With the completion of this first of four refurbishments, OPG is demonstrating our commitment to completing the four-unit Darlington Refurbishment in 2026 on time and on budget, and to generating jobs and clean energy for the province.