Ontario names Hydro One to build northern transmission spine to unlock Greenstone region

Ontario has formally designated Hydro One to deliver a new priority transmission project serving the Greenstone corridor, a move intended to shore up electricity capacity and reduce chronic outages in several northern communities. The planned asset is a single-circuit 230 kilovolt transmission line engineered to accommodate a second circuit in future, tying into the province's existing 230 kV network at the Nipigon Bay area and extending eastward to Longlac and toward Aroland First Nation where a new switching facility is proposed. The government has set an in-service target of 2032, establishing a multi-year schedule for planning, approvals, and construction across remote terrain. A central feature of the plan is an equity partnership model that gives neighbouring First Nations the opportunity to hold half of the transmission-line ownership, coupling infrastructure delivery with local investment and capacity building. Officials and community leaders frame the line as essential infrastructure to support reliable service, enable resource and industrial projects in the Ring of Fire region, and create long-term economic participation for Indigenous partners. From a technical perspective, the design choice of a single 230 kV circuit with provision for a second reduces near-term capital while preserving the option to double capacity as demand materializes. Critical next steps will include detailed route selection, environmental and permitting reviews, Indigenous-led engagement processes, and coordination with the existing East–West transmission corridor to ensure operational reliability. The project’s success will hinge on resolving access challenges in rugged geography, securing timely regulatory approvals, and translating the equity arrangement into tangible procurement, training and employment outcomes for the partner communities. Financing and cost-allocation details were not disclosed in the designation notice, leaving the ultimate budget and tariff implications for regulators and Hydro One to define during development. For mining and other industrial developers, the line represents a predictable path to grid access that could de-risk investment decisions and accelerate project timelines in the region. For Indigenous partners, the structure promises both revenue participation and decision-making roles, but it also imposes responsibilities around governance, financing contribution and ongoing asset management. Overall, the designation is an important policy signal: Ontario is prioritizing transmission expansion in the north to link energy infrastructure with economic and reconciliation objectives, while the practical challenge now shifts to execution, funding clarity and stakeholder alignment if the 2032 target is to be met.