Darlington Nuclear Refurbishment

Province: Ontario

City/Region: Clarington

Image Credit: Ontario Power Generation

4

Project Rank

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Project End: 2026

Project Type: Nuclear

Industry Sector: Energy

Project Amount: $12.8 billion

Date of Completion: 2026

Funding Source: Public

Provincial Funding: $12.8 billion

Previous Rankings

20254
20244
20234
20224
20213
20203
20192
20182
20172
201615
201517

About The Project

The Darlington Nuclear Refurbishment Project was managed in three distinct phases: Initiation Phase (2007–2009); Definition Phase (2010-2015); and Execution Phase (2016-2026). In November, 2024, OPG announced the completion of the refurbishment of Unit 1 five months ahead of schedule. The refurbishment of Unit 1 involved the successful removal and replacement of major components of the reactor and its associated equipment including pressure tubes, calandria tubes and feeder pipes, as well as inspection and upgrades of the turbine generator equipment. Unit 1 is the third of four units that have been successfully refurbished to date, with the overall project tracking on-time and on-budget. Unit 4 is tracking to be completed by 2026.

Project Owner: Ontario Power Generation

Project/Construction Manager: Aecon Group Inc. / AtkinsRéalis JV (execution phase of the retube and feeder replacement)

Engineer: Wood (WSP) (environmental)

Contractor: Generation: Andritz Hydro Canada, Astaldi Canada, Barnard-Pennecon JV Transmission: GE Energy (formerly Alstom Grid Canada and Alstom Renewable Power Canada), Andritz Hydro Canada, H.J. O’Connell Construction, Valard Construction; Bird Construction

Other Key Players: E.S. Fox; GE Power; ABB; Amec Foster Wheeler; Deloitte; Kiewit; Black & McDonald; Tetra Tech; BDI Canada; Burns & McDonnell/Modus (Independant Project Oversight); Cameco (calandria tubes and annulus spacers); Alstom AA6Power & Transport Canada Inc. (turbine generator refurbishment); Hatch (engineering services); Armtec; Accenture (management consultant); Golder (WSP) (geotechnical services); Dillon Consulting; KPMG; Wood (WSP) (geotechnical studies)

Other Suppliers: DECAST Ltd.; Laker Energy (nuclear components); Nu-Tech Precision Metals (calandria tubes)

Legal: Blake, Cassels & Graydon; Torys (acting for the owner)

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