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ARTICLE · 02 FEBRUARY 2026

Ontario Launches New Competitive Procurement For Electricity Transmission – Toronto Third Line Update

Blake, Cassels & Graydon LLP
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The Independent Electricity System Operator (IESO) has announced its latest design decisions for a formal competitive procurement for new electricity transmission build in Ontario...

CanadaEnergy and Natural Resources
Reena Goyal
Reena Goyal
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The Independent Electricity System Operator (IESO) has announced its latest design decisions for a formal competitive procurement for new electricity transmission build in Ontario, also known as its "Transmitter Selection Framework" (TSF). The TSF follows from a July 10, 2023 letter of direction from the (then) Ontario Ministry of Energy.

Most recently, the TSF is being used by the IESO to procure a transmitter to develop, construct and operate a 900 MW electricity transmission line from Clarington into downtown Toronto, to come into service no later than 2037. This "Toronto Third Line" will use existing infrastructure corridors, together with underwater segments and routes, to create Ontario's first underwater electricity transmission line. The Ontario Ministry of Energy and Mines has posted a notice for a 45-day comment period regarding this proposal.

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