OPG Awards CAD 3B in Pickering Nuclear Refurbishment Contracts

On 21 September 2026, Ontario Power Generation awarded more than CAD 3 billion in contracts to refurbish the Pickering B nuclear station, and in the same week site construction commenced on what the province is calling Canada’s largest clean energy infrastructure project. The awards formally close the door on a plan that once had Pickering headed for teardown.

The timing is not accidental. Ontario is projecting sharp load growth from electrification, population expansion, and industrial demand, and policymakers across North America and Europe are increasingly treating existing nuclear fleets as the cheapest route to large-scale, non-emitting baseload power. Pickering B’s four units, once weeks from layup and eventual decommissioning, are now the centrepiece of a Pickering nuclear refurbishment programme that stretches their operating lives into the 2060s.

This piece lays out who is building what, what it will cost and contribute, why the reversal happened when it did, and what execution risks stand between the contract signatures and the projected CAD 41.6 billion GDP contribution.

Three contracts, two joint ventures, and CAD 3 billion on the table

The CAD 3 billion headline splits into two distinct contracts, each with its own scope, its own consortium, and its own physical target inside the plant.

The larger is the retube, feeder, and boiler replacement (RFBR) contract, worth CAD 1.7 billion. It went to a 50/50 joint venture of Aecon Group and Candu Energy, a subsidiary of AtkinsRéalis. The three-year contract covers engineering, design, project delivery, and management for Unit 5, the first reactor in the sequence.

The second is the turbine generator replacement (TGR) contract, valued at CAD 1.3 billion. This one went to a consortium of Aecon and Siemens Energy Canada, with Aecon holding the majority stake and responsibility for construction services and materials procurement.

What each contract actually buys is heavy, physical replacement of core plant systems.

• RFBR scope: retube, feeder, and boiler replacement across the CANDU reactor systems, covering 1,520 fuel channels and 48 boilers in total across the four units
• TGR scope: 14 new steam turbine rotors, full stator rewinds, an overhaul of four generators, new auxiliary systems, and a new control and monitoring system
• Broader programme scope: construction of a 1.5-kilometre deep-water intake

For anyone tracking the contractor side of this, Aecon is the name that matters most. It sits in both consortia, which puts a single company at the centre of the two largest work packages on the project.

The investor signal: Aecon’s combined share across both contracts adds approximately CAD 1.75 billion to its Q3 2026 construction backlog, giving it multi-year revenue visibility on a project that runs into the mid-2030s.

That dual position matters. It means Aecon is not one participant among many in Canada’s nuclear build-out. It is now structurally central to it, and the backlog addition gives investors a concrete, contracted revenue line rather than a speculative pipeline.

From decommissioning order to Canada’s biggest clean energy project

Pickering B was supposed to stop generating electricity in 2026 and head to decommissioning. Getting from that endpoint to a construction start took four years and a series of deliberate approval gates.

The reversal moved in stages rather than a single decision.

1. 2022: The provincial government directed OPG to keep Units 5-8 running through 2026 and to assess whether refurbishment was viable
2. January 2024: The refurbishment initiation phase was authorised
3. January 2025: The definition phase was approved, one year on
4. November 2025: Ontario formally approved OPG’s refurbishment plan, clearing the execution phase to proceed
5. 21 September 2026: Site construction commenced and the contracts were announced

That staged sequence tells you something about the durability of the decision. This was not an emergency call made under short-term political pressure. It was a four-year, phase-gated commitment, which makes a future reversal considerably harder to justify now that ground has been broken.

Why the calculus changed

The demand side did most of the work. Ontario is planning for rising electricity consumption from population growth, industrial expansion, and the electrification of transport and heating, all of which need large blocks of reliable, non-emitting power.

Refurbishing existing CANDU units is generally regarded as cheaper and faster than building equivalent greenfield nuclear or replacing the capacity with gas. The supply chain and expertise already exist, and net-zero targets make new baseload gas politically awkward.

The global push for nuclear capacity tripling by 2050 is one reason policymakers in Ontario and elsewhere are treating life-extension programmes as a near-term necessity rather than a long-term option, since new-build timelines cannot close the gap fast enough on their own.

The historical record reinforced the case. Pickering has operated since 1971, with Units 5-8 entering service in the mid-1980s, and OPG says the station has supplied as much as 14% of Ontario’s electricity.

“This is Canada’s largest clean energy infrastructure undertaking,” said Stephen Lecce, Ontario Minister of Energy and Mines, framing the project as a cornerstone of the province’s supply plan.

OPG President and CEO Nicolle Butcher described Pickering as one of the world’s largest and highest-performing nuclear facilities since its first unit began operating. For investors watching Canadian nuclear infrastructure, the read is that provincial governments are now pricing baseload reliability as a structural priority, not a one-term choice.

Canada’s nuclear energy strategy, which encompasses CANDU refurbishments, uranium exports, and an emerging SMR pipeline, has elevated Pickering’s role from a single utility project to a cornerstone of national industrial policy with implications well beyond Ontario’s grid.

2,200 MW, 37,000 jobs, and CAD 41.6 billion in projected GDP

Start with the energy. Once all four units are refurbished, Pickering is projected to deliver up to 2,200 MW, enough to power roughly 2.2 million homes. Each unit’s life extends by up to 38 years, pushing operation into the 2060s and restoring a large block of non-emitting baseload just as Ontario’s grid load climbs.

Then the labour side, which is where the numbers widen. The project is expected to create around 37,000 direct and indirect jobs, with approximately 30,500 annual construction positions, while preserving 4,500 existing jobs.

The distinction matters: this is not only new hiring. It also keeps a specialised nuclear workforce employed that would otherwise have dispersed once the station wound down.

Finally, the national economic figure. The full refurbishment is anticipated to contribute approximately CAD 41.6 billion to Canada’s GDP, with the province reporting that more than 90% of costs are projected to stay in Ontario (a figure that remains directional rather than independently confirmed).

The scale signal: A CAD 41.6 billion GDP contribution concentrated in one province reframes this from a utility maintenance decision into national industrial policy.

Aecon CEO Jean-Louis Servranckx and AtkinsRéalis CEO Ian Edwards both pointed to the depth of Canada’s nuclear workforce and supply chain in their remarks. For readers tracking Canadian energy equities, that supply chain depth is the part that outlasts Pickering itself: it underpins the viability of future small modular reactor (SMR) and advanced nuclear programmes.

What has to go right before the lights come back on

The contracts are signed, but the project is not yet a fully de-risked commitment. The variables that will decide whether it hits its timeline are specific and trackable, starting with the regulator.

Site construction has commenced, but the execution-phase licence that authorises formal project delivery from January 2027 is still pending. The Canadian Nuclear Safety Commission (CNSC) completed its Part 1 hearing in June 2026, and the Part 2 hearing is scheduled for October 2026.

The CNSC Pickering licence renewal hearings are structured across two parts, with Part 1 completed in June 2026 and Part 2 scheduled for October 2026, making that October sitting the formal regulatory gate between current site preparation and the January 2027 execution-phase start.

“Pending final licensing approvals from the Canadian Nuclear Safety Commission (CNSC), OPG will begin the Project Execution Phase to refurbish Pickering ‘B’ units 5 to 8 in early 2027,” the Province of Ontario stated.

For investors, that October 2026 Part 2 hearing is the next material regulatory gate. If approvals slip beyond January 2027, both the execution schedule and the economic projections move with them, and that sequencing risk is not yet priced into most commentary on the project.

There is also the community and Indigenous dimension. Submissions from Indigenous nations to the CNSC raise conditions such as requiring the dry waste facility to be completed and in use before refurbished units operate, a legitimate constraint on the schedule rather than an obstacle to be dismissed.

Schedule precedents from Bruce and Darlington

The construction risk has precedent. Prior CANDU refurbishments at Bruce Power and Darlington ultimately restored long-term capacity, but they involved schedule and cost adjustments as detailed engineering and inspection findings emerged.

Pickering adds its own complexity by sequencing work across four units, with Unit 5 first and Units 6, 7, and 8 following in later phases. All four units are being placed in layup by the end of September 2026.

The remaining execution risks group into four categories:

• Regulatory approval timing, hinging on the CNSC Part 2 hearing and the January 2027 execution licence
• Indigenous community conditions, including the dry waste facility completion requirement
• Multi-unit sequencing complexity across Units 5-8
• Cost and schedule precedents from prior CANDU refurbishments

The approximate 2031 return-to-service date floated for Unit 5 remains directional and unconfirmed. Overall completion is targeted for the mid-2030s.

What the contracts lock in, and what still has to be earned

The clean way to read this announcement is to separate what is now confirmed from what still depends on delivery.

Confirmed:

• CAD 3 billion in contracts awarded across the RFBR and TGR packages
• Site construction commenced on 21 September 2026
• Approximately CAD 1.75 billion added to Aecon’s Q3 2026 backlog
• All four Units 5-8 in layup by the end of September 2026, and a policy direction that will not easily reverse now that construction has begun

Contingent:

• CNSC execution-phase approval, with the Part 2 hearing in October 2026
• The January 2027 execution start and mid-2030s completion
• The 2,200 MW capacity restoration and the CAD 41.6 billion GDP projection, both dependent on delivery that has not yet happened

The wider frame matters too. Countries including the UK and parts of Europe and Asia are pursuing life-extension and uprates of existing nuclear plants alongside new-build and SMR programmes as part of net-zero strategies. Keeping Canadian vendors and workers busy on Pickering, Bruce, and Darlington preserves the capacity those future advanced nuclear projects will need.

Keeping Canadian vendors and workers busy on Pickering, Bruce, and Darlington preserves the supply chain depth and workforce that advanced nuclear programmes, including microreactor and SMR projects now in planning and early development across Canada, will depend on when they reach construction.

The announcement marks the point of no return on policy. It does not mark it on outcome, and the variables still to be resolved are specific, trackable, and worth watching in the months ahead.

For investors exploring the full scope of Canadian nuclear investment beyond Pickering, our dedicated guide to Canada’s nuclear supply chain covers uranium production, CANDU vendor networks, and the SMR procurement pipeline that will draw on the same workforce and industrial base the Pickering refurbishment is now reinforcing.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results, and financial projections are subject to market conditions and various risk factors. Forward-looking statements regarding capacity, timelines, and economic contribution are speculative and subject to change based on regulatory and construction developments.