FlatironDragados Deal on $6B Canada Dam Rehab Is Planning Stage, Not a Bid Yet
Engineering News-Record reports that a FlatironDragados-led team has signed a development agreement with New Brunswick’s provincial utility to plan a roughly $6 billion rehabilitation of the Mactaquac Generating Station, but the deal is a planning milestone, not a construction contract. NB Power still has to complete a 12-month development phase, secure federal fisheries authorization, and win shareholder approval before any work packages hit the market, with the earliest possible construction start pegged at the second quarter of 2027.
Background
NB Power signed the development agreement on July 30 with a partnership of FlatironDragados, Aecon and Green Infrastructure Partners, according to ENR. The target is the Mactaquac Generating Station on the Saint John River, about 20 miles west of Fredericton, which has operated since 1968 and now supplies roughly 12% of the province’s electricity demand and 20% of its peak generating capacity.
The station’s concrete has been deteriorating for decades because of alkali-aggregate reaction, a chemical process that causes concrete to expand and crack in the presence of moisture. NB Power says the damage has already affected spillway gates and turbine equipment, and without a major rehabilitation, the facility likely could not keep operating past 2030.
Rather than decommission the dam, NB Power chose a life-extension program designed to keep Mactaquac running through 2068. Under the current plan, rehabilitation would run roughly 12 years while the plant stays operable, with sequential replacement of all six generating units starting with the first unit in 2028-2029 and the rest following through 2036. The work also includes concrete rehabilitation across the powerhouse, intake, tailrace and spillway, seepage mitigation, mechanical and electrical system upgrades, and new fish-passage infrastructure. NB Power estimates the total program will cost between $5.4 billion and $6.4 billion.
A provincial environmental impact assessment was approved in 2025, but ENR reports that federal Fisheries Act authorization and final shareholder approval are still pending. NB Power spokesperson Elizabeth Fraser-McAllister told ENR that finishing the development phase “would not automatically lead to a construction contract,” and any future work stays subject to additional regulatory approvals.
Analysis
The headline number, $6 billion, is going to draw attention across the contracting world, and understandably so. But the structure of this deal matters more than the dollar figure right now. NB Power has entered a development agreement, not an EPC contract. That distinction determines when real subcontracting opportunity shows up, and right now that answer is not soon.
The 12-month development phase exists precisely so FlatironDragados, Aecon and Green Infrastructure Partners can nail down design, schedule and cost estimates before NB Power commits to spending billions of dollars. That is a normal, prudent step for a megaproject of this complexity, especially one involving a live hydroelectric facility that has to keep generating power while crews rebuild it piece by piece over more than a decade. But it also means the project timeline has multiple off-ramps. Federal Fisheries Act authorization is still outstanding. Shareholder approval, which for a provincial Crown utility means government sign-off, has not happened. Either of those could delay or reshape the scope before a single construction package is issued.
The published schedule gives the clearest signal: construction could start as early as the second quarter of 2027 and wrap in 2037 or 2038, depending on how the six-unit sequencing shakes out. That is roughly a year and a half from now, at the earliest, before the first meaningful subcontract packages likely emerge. Given the scale of what NB Power is describing, concrete rehabilitation across the intake, tailrace, spillway and powerhouse, plus mechanical and electrical modernization on six generating units, this project will eventually require deep benches of specialty trades. But “eventually” is the operative word.
What is worth watching in the meantime is who NB Power and the development team bring in during the planning phase itself. Preparatory work and product testing are already underway, according to ENR, which suggests some early-stage geotechnical, materials testing and design-support work is happening now, likely through the lead partnership rather than open competitive bidding. That is typically how these development-phase megaprojects operate: the prime team controls early scope internally, and the broader subcontractor market gets access once the owner formally sanctions construction.
What It Means for Subcontractors
- This is a name-to-watch, not a bid opportunity. No construction subcontract packages will open before the development phase concludes and NB Power makes a final investment decision, with construction not expected to start before Q2 2027 at the earliest.
- Federal Fisheries Act authorization and NB Power shareholder approval remain outstanding. Contractors should treat those two approvals as the real triggers for project sanction, not the July 30 development agreement.
- Trades likely to see eventual demand include concrete rehabilitation and repair specialists, mechanical and electrical contractors for turbine and generating unit replacement, and fish-passage infrastructure specialists, given the scope described for the powerhouse, intake, tailrace and spillway.
- The project’s six-unit replacement sequence starts with unit one in 2028-2029 and continues through 2036, which means the earliest firm construction packages will likely track that unit-by-unit schedule rather than opening all at once.
- Companies interested in future work should track NB Power’s public procurement channels and FlatironDragados Canada, Aecon and Green Infrastructure Partners directly, since the development-phase team will likely shape how construction packages are structured before they go to market.
- Because the estimate range is $5.4 billion to $6.4 billion and shareholder approval is not yet secured, subcontractors should treat cost and scope details as preliminary and confirm any procurement timeline directly with NB Power before committing resources to bid preparation.
