TOP100 2026 Report - Report - Page 20
6
NUCLEAR
Darlington Nuclear Refurbishment
$12.8 BILLION
2025 Rank: 4
Location: Clarington, Ont.
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, BarnardPennecon 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); Borden
Ladner Gervais
Funding: Public
Substantial Completion: 2026
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RENEW CANADA – TOP100 2026
OPG
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.
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