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Performance update

As part of our commitment to keep you informed, this report tracks performance for Ontario Power Generation’s (OPG’s) Darlington Nuclear in the areas of safety, operational and environmental performance, and significant accomplishments during the fourth quarter of 2022.

A dial graphic indicating "white" for good performance.5.9 TWh

Electricity production

The electrical energy generated, minus station needs

OPG’s nuclear electricity generation for Q4 of 2022 totalled 5.9 terawatt hours (TWh) compared to 8.4 TWh in 2021 in the same quarter. In Q4, Darlington Nuclear produced 2.3 TWh of electricity, which was 6 per cent of the electricity produced in Ontario.

A dial graphic indicating "green" for excellent performance.86.99% UCF


Unit capability factor

Compared to Q3 in 2021, Darlington’s Unit Capability Factor (UCF) for Q4 2022 is higher (86.99) primarily as a result of a decrease in the number of days the station has been shut down for maintenance outages.

A dial graphic indicating "green" for excellent performance.0 spills 


Spills to the environment

During Q4 2022, there were no spills to the environment at Darlington Nuclear reportable to a regulatory authority.

A dial graphic indicating "green" for excellent performance.0.9 TRIF


Total Recordable Injury Frequency

Total Recordable Injury Frequency (TRIF) measures the number of injuries involving OPG employees that result in a fatality, lost time, requiring restricted work and requiring medical treatment per 200,000 hours. In Q3 2022, Darlington Nuclear recorded 0.9 injuries per 200,000 hours worked.

About OPG’s Nuclear Generating Stations

Ontario Power Generation owns and operates the Pickering and Darlington Nuclear Generating Stations. The two stations have a combined generating capacity of about 4,850 megawatts with Darlington Unit 1 and Unit 3 currently on refurbishment. Accounting for 16.0 per cent of the electricity produced in Ontario in Q4, OPG’s nuclear units generated 5.9 terawatt hours.


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