Lower Mattagami Hydroelectric Complex

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Image Credit: OPG

Ranking for 2015: 15

Industry Sector: Energy

Specific Sector: Hydroelectric

Range: $1 billion - $5 billion

Project Value: $2,600,000,000

Provincial: $2.6 billion

Government Funds Involved: In August 2010, a $700 million bank credit facility was established to support initial construction for the project. Additional financing arrangements are being established. A long-term Hydroelectric Energy Supply Agreement (HESA) contract has also been negotiated between OPG and the Ontario Power Authority.

Funding Source: Public

Location: Northeast of Kapuskasing, Ontario

Estimated End Date of Substantial Completion: 2015

LEED: N/A


This project is the largest investment in hydroelectric power in Northern Ontario in nearly 40 years. It has four components, which include the rebuilding of the Smoky Falls Generating Station as well as the addition of new generating units at the Harmon, Kipling, and Little Long generating stations. By the time work is completed, the capacity of the Lower Mattagami plants will have increased to 924 from 486 MW.

Smoky Falls was originally constructed in 1931, while the others were built in the 1960s. In order to accommodate the additional energy that will be supplied because of this project, Hydro One is adding an additional 230-kV circuit to the transmission line that runs from the Harmon Junction to the Kipling Generating Station, running approximately 4 km. The Moose Cree Nation will have up to a 25-per-cent equity share in the project. Construction is ongoing with the entire project slated for completion in 2015.


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