Ontario’s grid-scale battery buildout just hit a major milestone, as a new $325 million battery energy storage project powered by Tesla Megapacks has officially entered service, and it’s now the largest operating facility of its kind in Canada.
The Hagersville Battery Energy Storage Park, developed by Boralex in partnership with Six Nations of the Grand River Development Corporation (SNGRDC), delivers 300 MW of power and 1,200 MWh of storage capacity from 334 Tesla Megapack 2XL units, enabling up to four hours of continuous full-power and critical flexibility to Ontario’s electricity system.
That flexibility is increasingly important as Ontario adds more wind and solar generation. Large battery systems like Hagersville can absorb excess power when supply is high and release it during peak demand, helping balance the system without relying solely on fossil fuel peaker plants.
Beyond its technical scale, Hagersville stands out for its Indigenous partnership model. SNGRDC co-developed the project and continues to expand its energy portfolio, which already includes multiple storage, solar, and wind assets. Additional battery projects—including a planned 125 MW / 500 MWh installation in Oxford County—are also in the pipeline.
The project also strengthens Boralex’s position as a major storage operator. With Hagersville now online and the recently commissioned Sanjgon facility in Lakeshore—an 80 MW / 320 MWh project powered by 89 Megapack 2XL units—the company’s total operational battery capacity in Canada rises to 380 MW / 1,520 MWh.
Ontario is quickly emerging as a national leader in grid-scale storage, with high-profile projects like the 250 MW / 1,000 MWh Oneida Energy Storage Project in Haldimand County also leveraging Tesla’s battery platform.
An official inauguration event is scheduled for Spring 2026.
