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Ontario's nuclear fleet renewal

Ontario's nuclear fleet renewal

Built World

Canada's largest private-sector infrastructure project extends reactor life by 40 years

February 18th, 2026: Bruce Power Unit 3 Construction Phase Complete

Overview

Bruce Power completed the construction phase of its Unit 3 nuclear reactor refurbishment on February 18, 2026—on budget and ahead of schedule. It's the second of six reactors Bruce Power will refurbish by 2033 in a privately-funded program extending the site's operational life through 2064.

The reactor is one of eight at the world's largest operating nuclear facility by reactor count. It will return to service in the coming months with enough capacity to power a city of 700,000 for 35 years.

Ontario is betting on nuclear to meet electricity demand the Independent Electricity System Operator projects will grow 75% by 2050, driven by electric vehicles, data centers, and industrial electrification. Darlington's fourth and final unit was completed in early 2026. The two programs (Bruce Power's six-unit overhaul and Ontario Power Generation's Darlington refurbishment) total over $25 billion and will keep nuclear at roughly half of Ontario's electricity for decades.

Play on this story Voices Debate Predict

Key Indicators

2 of 6
Bruce Power units refurbished
Unit 6 returned to service in 2023; Unit 3 construction phase now complete
4 of 4
Darlington units refurbished
Ontario Power Generation completed all four Darlington reactors in February 2026
75%
Projected demand increase
Ontario electricity demand forecast to grow 75% by 2050 according to the Independent Electricity System Operator
~50%
Nuclear share of Ontario power
Nuclear energy provides roughly half of Ontario's electricity generation

Voices

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Predict 4 ways this could play out. Contrarian picks score more — points lock when the scenario resolves. Log in to play
Timeline Five events from this story — drag them oldest to newest. Log in to play
Connections Sixteen names from the news. Find the four hidden groups of four. Log in to play

People Involved

Eric Chassard
Eric Chassard
Leading refurbishment program execution

Organizations Involved

Bruce Power
Bruce Power
Private Nuclear Generator
Executing six-unit refurbishment program

Canada's only private-sector nuclear generator, operating eight CANDU reactors that supply roughly 30% of Ontario's electricity.
Ontario Power Generation (OPG)
Ontario Power Generation (OPG)
Provincial Crown Corporation
Completed Darlington refurbishment; planning Pickering refurbishment

Ontario's largest electricity generator, operating nuclear, hydroelectric, and thermal facilities across the province.
Independent Electricity System Operator (IESO)
Independent Electricity System Operator (IESO)
Provincial Agency
Forecasting 75% demand growth by 2050

Crown agency responsible for operating Ontario's electricity market and directing the real-time operation of the provincial power grid.

Timeline

December 2016 February 2026

9 events Latest: February 18th, 2026 · 3 months ago
Tap a bar to jump to that date

  1. Bruce Power Unit 3 Construction Phase Complete

    Latest Milestone

    Bruce Power completes the construction phase of Unit 3 refurbishment on budget and ahead of schedule, with the reactor expected to return to service in coming months.

  2. Darlington Refurbishment Complete

    Milestone

    Ontario Power Generation completes all four Darlington reactor refurbishments four months ahead of schedule and $150 million under the $12.8 billion budget.

  3. IESO Approves Unit 5 Refurbishment

    Regulatory

    The Independent Electricity System Operator verifies Bruce Power met requirements to proceed with Unit 5 refurbishment, scheduled for late 2025.

  4. Unit 4 Refurbishment Begins

    Construction

    Bruce Power begins Unit 4 Major Component Replacement, the third reactor to enter the refurbishment program.

  5. Unit 6 Returns to Commercial Service

    Operations

    Unit 6 declared commercially operational exactly 39 years after its original in-service date, completing the first full refurbishment cycle.

  6. Unit 6 Construction Phase Complete

    Milestone

    Bruce Power completes the construction phase of Unit 6 refurbishment on time and on budget, including replacement of 480 fuel channels and eight steam generators.

  7. Unit 3 Refurbishment Begins

    Construction

    Bruce Power begins the Major Component Replacement outage for Unit 3, the second reactor in the refurbishment sequence.

  8. Unit 6 Refurbishment Begins

    Construction

    Bruce Power takes Unit 6 offline to begin the first Major Component Replacement, marking the start of the refurbishment program.

  9. Bruce Power Signs $13 Billion Refurbishment Agreement

    Contract

    Bruce Power and the Ontario government sign an amended agreement for the Major Component Replacement program covering Units 3-8, extending site operations to 2064.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

September 2008 - November 2012

Point Lepreau Refurbishment (2008-2012)

New Brunswick Power undertook Canada's first CANDU-6 refurbishment at the Point Lepreau Generating Station. The project was originally budgeted at $1.4 billion with an 18-month timeline. Technical challenges and scope changes pushed the final cost to approximately $2.4 billion, with the reactor returning to service three years late.

Then

New Brunswick faced electricity shortfalls and higher costs during the extended outage, importing power from neighboring provinces.

Now

The experience established lessons for subsequent CANDU refurbishments, influencing planning approaches at Bruce Power and OPG. The reactor has since operated reliably with an extended lifespan.

Why this matters now

Point Lepreau's difficulties contrast sharply with Bruce Power's on-time, on-budget performance, suggesting the industry has learned from early refurbishment challenges. The comparison is central to evaluating whether Bruce Power's success can continue through four more units.

April 2009 - July 2011

Wolsong Unit 1 Refurbishment (2009-2011)

Korea Hydro and Nuclear Power retubed the 679 MW Wolsong Unit 1 CANDU reactor in South Korea, marking the first successful CANDU-6 refurbishment completed on schedule. The project replaced all 380 fuel channels in 27 months, demonstrating that the technology could be refurbished efficiently.

Then

Wolsong-1 returned to service with a 25-year life extension, validating the economic case for CANDU refurbishment.

Now

The success influenced decisions to proceed with Canadian refurbishment programs. South Korea's expertise became a benchmark for the global CANDU operator community.

Why this matters now

Wolsong demonstrated that CANDU refurbishment could be executed efficiently when properly planned, providing a model that informed Bruce Power's approach. The 27-month timeline set expectations for what well-managed projects could achieve.

February 2016 - February 2026

Darlington Refurbishment (2016-2026)

Ontario Power Generation undertook refurbishment of all four Darlington reactors at a total cost of $12.8 billion, completing Unit 2 in 2020 and finishing the final Unit 4 in February 2026—four months ahead of schedule and $150 million under budget. The project was the largest infrastructure undertaking in Ontario's history.

Then

Darlington's 3,500 MW of capacity returns to full service, providing electricity for 3.5 million homes with a lifespan extended to at least 2055.

Now

The successful completion, announced just weeks before Bruce Power's Unit 3 milestone, demonstrates Ontario's nuclear industry can deliver complex megaprojects on time.

Why this matters now

Darlington's completion sets a benchmark for the remaining Bruce Power refurbishments. Both projects share contractors and workforce, meaning lessons transfer directly. The combined success strengthens the case for continued nuclear investment in Ontario.

Sources

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GlobeNewswire Yahoo Finance Bruce Power IESO NucNet Wikipedia World Nuclear Association Canadian Nuclear Association Bruce Power Bruce Power