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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.
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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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Public safety
We maintain a long-term commitment to the health, safety and energy needs of Ontarians, and it shows in everything we do.
Our commitments in action
Code of Business Conduct
We operate according to a Code of Business Conduct that ensures safety, integrity and efficiency for Ontario.
Governance & regulation

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
Educational resources
We support students and educators by providing learning resources developed specifically for teachers, young people and schools.
Our role in the system
Nuclear safety and emergency preparedness
We build safety into every step of our energy production and about our comprehensive emergency preparedness plans for Ontarians.
Our commitment to safety
- Nuclear safety and emergency preparedness
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An aerial view of the Darlington Nuclear Generating Station.

Darlington refurbishment project

Our mission, vision & valuesAs Ontario’s largest clean electricity generator, see how our focus is on generating safe, efficient, and reliable energy.Learn MoreAbout Our ...

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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Clean energy credits
With an extensive portfolio of clean energy generation across North America, OPG can offer environmental credits in both Canada and the US.
Our services
- Electrification services
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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.

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.

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.

Hydroelectric Water Portal (water.opg.com)

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

News & resources

Watt’s New
In our revamped e-newsletter, find out how we're helping electrify Ontario while strengthening its economy, communities, and the environment.
Newsroom
WattNext.ca
Ontario Science Centre, Ontario Tech University and OPG's energy education program aims to educate, inform, and connect Ontarians with energy careers.
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Hydroelectric Water Portal (water.opg.com)

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June 17, 2025

8 min read

Nuclear Waste Management Facility Performance Report - Q1 2025 Results

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Performance update

As part of our commitment to keep you informed, this report tracks performance for Ontario Power Generation (OPG)’s Nuclear Waste Management Facilities in the areas of safety, operations, and the environment. It also summarizes significant accomplishments achieved during the first quarter of 2025.

OPG operates three nuclear waste facilities in Darlington, Pickering and Bruce County. Used fuel is removed from the reactors and cooled inside the station’s fuel bay. Low and Intermediate Level waste is processed and then stored at OPG’s Western Waste Management Facility.

0.0 TRIF

A dial graphic indicating "green" for excellent performance. 0.0 incidents

Safety

Total Reportable Injury Frequency (TRIF)

TRIF is a measure of the number of injuries involving OPG employees that result in a fatality, lost time, requiring restricted work or requiring medical treatment per 200,000 hours worked. The current TRIF average sits at .0, below the year-to-date target of 0.47. The year-end target is not to exceed 0.47.

Transportation Safety

The transportation of waste to our Western facility from Darlington, Pickering and Bruce Power is managed by experienced and skilled drivers. During Q1, all shipments were made safely and accident-free and the fleet travelled 122,041 kilometres. As of June 2, 2025, 235,870 kilometres have been travelled this year.

A dial graphic indicating "green" for excellent performance.

0 spills

Environment

Spills to the environment

In this quarter, there were no spills to the environment at our waste facilities that were reportable to a regulatory authority. For detailed environmental information, please refer to the environmental data reports available on our Regulatory Reporting page.

PWMF - 27

DWMF - 3

WWMF - 26

Operational Performance

Pickering Waste Management Facility (PWMF)

A total of 27 Dry Storage Containers (DSC) were transferred in Q1, which totals 27 of the 80 year-end transfer target for 2025.

Darlington Waste Management Facility (DWMF)

A total of 3 Dry Storage Containers (DSC) were transferred during Q1, totalling 3 of the 45 year-end transfer target for 2025.

Western Waste Management Facility (WWMF)

A total of 26 Used Fuel Dry Storage Containers (DSC) were transferred in Q1, totalling 26 of the 110 year-end transfer target for 2025.

889 m³

Waste Minimization

In Q1, a total of 889 cubic metres of low-level waste was processed through incineration. This was below the year-to-date target of 907 cubic metres. The goal is to process 3,510 cubic metres by the end of 2025.

Questions?

Please contact Jennifer Knox, Director - Nuclear Stakeholder Relations, through the form below.

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Nuclear Waste Management Facility Performance Report – Q1 2025

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