Ontario Power Generation delays nuclear project due to engineering challenges
What happened
Ontario Power Generation reported its third-quarter 2026 financial results, stating that the Darlington New Nuclear Project Unit 1 will not meet the October 2030 commercial operation date or the previously estimated cost of CAD7.7 billion. OPG attributed the delay and cost overrun to the ongoing engineering work by GE Vernova Hitachi Nuclear Energy for its first-of-a-kind SMR. OPG is working with GE Vernova Hitachi to complete the outstanding engineering scope and move the project forward.
Why it matters
The project's cost and schedule are currently undergoing a comprehensive reassessment, which will be informed by the completion of the engineering scope and evaluation of design maturity. This situation highlights how engineering complexity and supply chain performance are impacting the construction execution of the Small Modular Reactor project.
Hitachi Energy and Ontario previously announced a plan for a new factory investment.
Who's involved
- Ontario Power GenerationElectric utility contracted to receive Small Modular Reactors and engineering services from Hitachi.
- HitachiJapanese multinational providing Small Modular Reactors and engineering services for Ontario Power Generation's construction.
- OntarioProvince whose utility, Ontario Power Generation, operates under its mandate.
Who could feel it
Possible knock-on effectsThese are possibilities Brind reasoned out, not predictions, and not advice. Most are not stated in any report.
- OntarioSpeculative
Ontario might see changes in its financial mandate due to cost and schedule overruns on the Darlington New Nuclear Project.
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The entities involved
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Hitachi
Japanese multinational engineering and electronics company
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Ontario Power Generation
electric utility company
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