Canada’s largest operating battery storage running Tesla Megapack 2XL units is now commissioned in Ontario

Boralex and and Six Nations of the Grand River Development Corporation (SNGRDC) have announced the commercial commissioning of the Hagersville Battery Energy Storage Park in Ontario, a four-hour duration projects.

The BESS site, located in Hagerville, on the Niagara Peninsula in Southern Ontario, Canada, on the north shore of Lake Erie, consists primarily of 334 Tesla Megapack 2XL units, is 300 MW / 1,200 MWh in power and capacity.

It was selected by the Ontario Independent Electricity System Operator (IESO) in 2023 as part of its Expedited Long-Term Request for Proposals (RFP) for storage capacity. Boralex said it was also supporting Haldimand County through a “Community Benefit Agreement.”

Another winning project now known as the 80 MW / 320 MWh Sanjgon BESS, once called Tilbury, was the other winning project that Boralex and Walpole Island First Nation announced was commissioned in January 2026. That was Boralex’s first in North America.

Outside of the IESO awards, Boralex and SNGRDC are also working on the 125 MW / 500 MWh Oxford BESS, which the organizations said “is expected to begin construction shortly.”

SNGRDC is also planning for the commissioning of the Elora BESS and the Hedley BESS in 2027, with Canadian Solar supplying those sites with its e-STORAGE subsidiary’s SolBank 3.0 BESS.

What they said – a veritable cast of executives and politicians were keen to have their say on the Hagersville Battery Energy Storage Park. The most applicable comments are below:

“SNGRDC is pleased to once again collaborate with Boralex on a transformative project like the Hagersville Battery Energy Storage Park. This project builds on our rapidly expanding battery energy storage portfolio and further reinforces SNGRDC’s role as a leader in this field. The project has created employment opportunities for Six Nations band members through A6N during construction, while delivering cost savings for Ontario ratepayers and meaningful environmental benefits that align with our commitment to environmental stewardship.”

Matt Jamieson, President and CEO of Six Nations of the Grand River Development Corporation.

“The Hagersville Battery Energy Storage Park demonstrates the value of Indigenous participation in the renewable energy sector, and Six Nations of the Grand River is pleased to have been a key development partner in strengthening the energy grid. Six Nations of the Grand River Development Corporation continue to pursue strategic investment opportunities that support economic self-sufficiency for our community and we look forward to future opportunities.”

Sherri-Lyn Hill, Elected Chief of Six Nations of the Grand River.

“The Hagersville Battery Energy Storage Park will build on a track record of delivering cost-effective energy storage projects through the Independent Electricity System Operator’s competitive procurements. Our continued work with Indigenous communities, municipalities, government, and project proponents like the Six Nations of the Grand River Development Corporation and Boralex is getting new electricity resources built in Ontario to help keep the province’s grid reliable and affordable, supporting continued economic growth.”

Lesley Gallinger, President & CEO, Independent Electricity System Operator.

“The commissioning of the Hagersville Battery Energy Storage Park is a defining moment in our 2030 Strategic Plan. It demonstrates our ability to deliver transformative infrastructure that stengthens grid reliability and accelerates the integration of renewable energy across North America—at the pace required to support economic growth, energy independence, and decarbonization. This project showcases how innovation, combined with strong partnerships, can create long-term value for both communities and shareholders.”

Patrick Decostre, President and CEO of Boralex.

“Hagersville is a powerful example of what’s possible when strong partnerships drive innovation. This project reflects not only technical excellence but also meaningful collaboration with Indigenous partners and local businesses, such as A6N, whose involvement helped bring this milestone to life. Together, we’ve set a new benchmark for energy transition and grid security—one that creates lasting value for communities and accelerates access to renewable power for all.”

Robin Deveaux, Executive Vice President and General Manager, North America, Boralex.