Major projects in Ontario
75 major projects: proposed, approved, under construction or on hold. Each has a value its source publishes, shown in its own currency. View on map
By stage
- Proposed 40
- Approved 5
- Awarded 1
- Under construction 29
By type
- Mines 24Metal 20, Industrial minerals 2
- Transit 19Bus 10, Rail 6, Facility 3
- Dams and power generation 19Energy storage 8, Hydro 4, Nuclear 4, Wind 1
- Transmission lines 10Line 10
- Airports 2
- Pipelines, oil and gas 1Pipeline 1
Largest by published value
- Ontario Line C$29.5B Toronto, Ontario · value from Ontario Builds
- GO Expansion C$27.5B Toronto, Ontario · value from Ontario Builds
- New Nuclear Power Plant - Darlington Small Modular Reactor Project C$20.9B Darlington, Ontario · value from NRCan Major Projects Inventory
- Bruce Nuclear Refurbishment C$13B Tiverton, Ontario · value from NRCan Major Projects Inventory
- Darlington Refurbishment Project C$12.8B Clarington, Ontario · value from NRCan Major Projects Inventory
- Scarborough Subway Extension C$10.2B Toronto, Ontario · value from Ontario Builds
- Pickering Refubrishment Project C$6.2B Pickering, Ontario · value from NRCan Major Projects Inventory
- Hazel McCallion LRT C$6B Mississauga, Ontario · value from Ontario Builds
- Meaford Pumped Storage Project C$4.3B Meaford, Ontario · value from NRCan Major Projects Inventory
- Eglinton Crosstown West Extension C$4B Toronto, Ontario · value from Ontario Builds
Newest stage changes
- New Guelph Transit Storage Facility: Proposed → Under construction (14 Sep 2026, Ontario Builds)
Narrower lists
All 75 projects
- Bissett CreekProposed · Mines (industrial minerals) · Pembroke, Ontario · C$102M
- Bloor-Yonge Capacity Improvement ProjectUnder construction · Transit (bus) · Toronto, Ontario · C$949M
- Bruce Nuclear RefurbishmentUnder construction · Dams and power generation (nuclear) · Tiverton, Ontario · C$13B
- Cobalt Refinery ComplexUnder construction · Mines · 5 km E of Cobalt, Ontario · C$77M
- Construction of a new bus rapid transit corridor along Dundas Street in MississaugaProposed · Transit (bus) · Mississauga, Ontario · C$224M
- Construction of a new bus rapid transit corridor along Lakeshore Road in MississaugaProposed · Transit (bus) · Mississauga, Ontario · C$40M
- CrawfordProposed · Mines (metal) · 40 km N of Timmins, Ontario · C$2.8B
- Darlington Refurbishment ProjectUnder construction · Dams and power generation (nuclear) · Clarington, Ontario · C$12.8B
- Design and Construction of a Transit Operations FacilityProposed · Transit (bus) · Milton, Ontario · C$47M
- Design and Construction of New Transit GarageUnder construction · Transit (facility) · Peterborough, Ontario · C$42.9M
- Detour Lake open pit expansion and underground developmentUnder construction · Mines (metal) · Detour Lake, Ontario · C$731M
- Eagle's Nest (McFaulds Lake)Approved · Mines (metal) · Webequie, Ontario · C$609M
- East London LinkUnder construction · Transit (bus) · London, Ontario · C$76.4M
- East Windsor ExpansionProposed · Dams and power generation (wind) · Windsor, Ontario · C$200M
- Eglinton Crosstown West ExtensionUnder construction · Transit (rail) · Toronto, Ontario · C$4B
- Enhanced Stop Amenities for Priority (Express) Bus CorridorsUnder construction · Transit (bus) · Mississauga, Ontario · C$36.8M
- Fitzroy South March BESSProposed · Dams and power generation (energy storage) · Ottawa, Ontario · C$650M
- Georgia LakeProposed · Mines (metal) · 150 km NE of Thunder Bay, Ontario · C$250M
- GO ExpansionUnder construction · Transit (rail) · Toronto, Ontario · C$27.5B
- Goliath ComplexApproved · Mines (metal) · Dryden, Ontario · C$335M
- Goreway BESSProposed · Dams and power generation (energy storage) · Brampton, Ontario · C$161M
- Great BearProposed · Mines (metal) · 130 km NNW of Dryden, Ontario · C$1.9B
- Greater Toronto Area East Line Durham Kawartha Power LineProposed · Transmission lines (line) · Pickering/Oshawa, Peterborough, Ontario · C$298M
- Hagersville Battery Energy Storage ParkProposed · Dams and power generation (energy storage) · Hagersville, Ontario · C$538M
- Hammond ReefApproved · Mines (metal) · Atikokan, Ontario · C$1.3B
- Hazel McCallion LRTUnder construction · Transit (rail) · Mississauga, Ontario · C$6B
- Island Gold ExpansionUnder construction · Mines (metal) · Dubreuilville, Ontario · C$627M
- Kitchener Central Transit Hub Phase 2Proposed · Transit (bus) · Waterloo Region, Ontario · C$93.3M
- Lithium Hydroxide RefineryProposed · Mines · Red Rock, Ontario · C$1.6B
- Longwood to Lakeshore Phase 1Proposed · Transmission lines (line) · Municipality of Strathroy-Caradoc to Municipality of Lakeshore, Ontario · C$800M
- Longwood to Lakeshore Phase 2Proposed · Transmission lines (line) · Municipality of Strathroy-Caradoc to Municipality of Lakeshore, Ontario · C$800M
- Marathon PGM Copper MineApproved · Mines (metal) · Marathon, Ontario · C$809M
- MartisonProposed · Mines (industrial minerals) · 70 km NNE of Hearst, Ontario · C$2.3B
- Meaford Pumped Storage ProjectProposed · Dams and power generation (energy storage) · Meaford, Ontario · C$4.3B
- Mississagi to Third Line Transmission Line North Shore Link ProjectProposed · Transmission lines (line) · Wharncliffe, Sault Ste. Marie, Ontario · C$250M
- New Guelph Transit Storage FacilityUnder construction · Transit (facility) · Guelph, Ontario · C$110M
- New Nuclear Power Plant - Darlington Small Modular Reactor ProjectUnder construction · Dams and power generation (nuclear) · Darlington, Ontario · C$20.9B
- Northeast Power Line (Mississagi to Hanmer Transmissio Line)Proposed · Transmission lines (line) · Wharncliffe, Sudbury, Ontario · C$530M
- Northwest Bulk Transmission Line Waasigan Transmission LineUnder construction · Transmission lines (line) · Thunder Bay to Dryden, Ontario · C$1.2B
- Onaping DepthUnder construction · Mines (metal) · Sudbury, Ontario · C$1.3B
- Ontario LineUnder construction · Transit (rail) · Toronto, Ontario · C$29.5B
- Ottawa LRT (Stage 2)Under construction · Transit (rail) · Ottawa, Ontario · C$2.4B
- Pakeagama LakeProposed · Mines (metal) · 180 km NNE of Red Lake, Ontario · C$943M
- Pearson LIFT: airside and baggage systemsUnder construction · Airports · Mississauga, Ontario · C$3B
- Pearson LIFT: Terminal 1 and 3 Revitalization ProgramAwarded · Airports · Mississauga, Ontario · C$1.5B
- Pickering Refubrishment ProjectProposed · Dams and power generation (nuclear) · Pickering, Ontario · C$6.2B
- Porcupine Complex (Pamour)Proposed · Mines (metal) · 8 km NE of South Porcupine, Ontario, Ontario · C$314M
- Power Downtown TorontoProposed · Dams and power generation · Toronto, Ontario · C$120M
- PUC Transmissionx ProjectProposed · Transmission lines (line) · Sault Ste. Marie, Ontario · C$189M
- R.H. Saunders RefurbishmentProposed · Dams and power generation (hydro) · Cornwall, Ontario · C$600M
- Ranney Falls ExpansionUnder construction · Dams and power generation · Campbellford, Ontario · C$77M
- Redevelopment of Coniston stationProposed · Dams and power generation (hydro) · Sudbury, Ontario · C$85M
- Redevelopment of the Calabogie siteUnder construction · Dams and power generation (hydro) · Greater Madawaska, Ontario · C$137M
- River Valley PalladiumProposed · Mines (metal) · 30 km N of Warren, Ontario · C$269M
- Scarborough Subway ExtensionUnder construction · Transit (rail) · Toronto, Ontario · C$10.2B
- ShakespeareProposed · Mines (metal) · Sudbury (20 km NE of Massey), Ontario · C$233M
- Sir Adam Beck Complex RefurbishmentProposed · Dams and power generation (hydro) · Niagara Falls, Ontario · C$1B
- Skyview 2 Battery Energy Storage SystemProposed · Dams and power generation (energy storage) · Edwardsburgh-Cardinal, Ontario · C$750M
- SmartTrack ProgramUnder construction · Transit (bus) · Toronto, Ontario · C$1.7B
- Springpole Lake Gold ProjectProposed · Mines (metal) · Uchi Lake, Ontario · C$958M
- St. Laurent Pipeline Replacement ProjectApproved · Pipelines, oil and gas (pipeline) · Ottawa, Ontario · C$209M
- St. Thomas Line (including Centennial Transformer Station & Line)Proposed · Transmission lines (line) · City of London to St. Thomas, Ontario · C$400M
- St.Clair Transmission LineProposed · Transmission lines (line) · St.Clair, Chatham Kent, Ontario · C$472M
- StobieUnder construction · Mines (metal) · Sudbury, Blezard Township, Ontario · C$205M
- Tilbury Battery StorageUnder construction · Dams and power generation (energy storage) · Lakeshore, Ontario · C$172M
- Tower Gold (formerly Garrison/Golden Highway)Proposed · Mines (metal) · 110 km E of Timmins, Ontario · C$1.6B
- Trail Road BESSProposed · Dams and power generation (energy storage) · Ottawa, Ontario · C$350M
- Transit HubProposed · Transit (bus) · Brampton, Ontario · C$30M
- Transit Maintenance & Storage FacilityUnder construction · Transit (facility) · Brampton, Ontario · C$128M
- Upper BeaverProposed · Mines (metal) · Kirkland Lake, Ontario · C$900M
- Victoria ProjectUnder construction · Mines (metal) · Sudbury, Ontario · C$1B
- Wawa to PorcupineProposed · Transmission lines (line) · Timmins, Greater Sudbury, Ontario · C$600M
- Wellington GatewayUnder construction · Transit (bus) · London, Ontario · C$76.3M
- West CacheProposed · Mines (metal) · 15 km WSW of Timmins, Ontario · C$150M
- York – Battery Energy Storage SystemUnder construction · Dams and power generation (energy storage) · King, Ontario · C$352M