Boralex and Six Nations of the Grand River Development Corporation Commission Canada’s Largest Operating Battery Storage Facility

Press Release

Boralex Inc. (“Boralex”) (TSX: BLX) and Six Nations of the Grand River Development Corporation (SNGRDC) announce the commercial commissioning of the Hagersville Battery Energy Storage Park, the largest operating battery energy storage facility in Canada. With a capacity of 300 MW / 1,200 MWh, the landmark project represents a significant milestone in Ontario’s energy transition and positions SNGRDC and Boralex as leaders in large-scale storage solutions.

Co-developed by SNGRDC and Boralex, who have a long history of successful partnerships in renewable energy developments, the Hagersville project was recently recognized as the “Innovative Clean Energy Project of the Year” by the Canadian Renewable Energy Association (CanREA), underscoring its impact and excellence in advancing energy infrastructure.

Throughout this project, Boralex and SNGRDC prioritized opportunities to involve local Six Nations labourers. In collaboration with construction partner Borea, A6N General Partnerships, which is majority-owned by SNGRDC in partnership with Aecon, was brought in to deliver key civil works on site – further strengthening local participation and economic benefits within the community.

The commissioning of the site underscores SNGRDC and Boralex’s commitment to delivering long-term value for all stakeholders, from local communities to shareholders, through innovative energy storage solutions. By stabilizing the grid and enabling greater integration of renewable energy, SNGRDC and Boralex are addressing critical system needs while driving sustainable growth.

With the commissioning of Hagersville and the recently launched Sanjgon Battery Energy Storage, Boralex’s total operational storage capacity now reaches 380 MW / 1,520 MWh, making Boralex Canada’s largest battery storage operator. The Hagersville project represents SNGRDC’s second battery energy storage facility to reach commercial operation, with an additional four projects currently under development. With a total of 1 GW of storage capacity, SNGRDC is the largest Indigenous holder of battery storage assets in North America. Additional storage projects are under development in partnership with SNGRDC and Boralex, including the 125 MW / 500 MWh Oxford project, which is expected to begin construction shortly.

An official inauguration event is planned for Spring 2026, which will bring together community members, Indigenous partners, political leaders, and media to celebrate the historic and symbolic significance of this achievement.

Highlights

• Key players in the industry:
  • Hagersville is Canada’s largest operational battery energy storage facility, bringing Boralex’s total installed storage capacity to 380 MW / 1,520 MWh and SNGRDC’s total installed storage capacity to 550 MW / 2,200 MWh.
  • The project was recently recognized as the “Innovative Clean Energy Project of the Year” by the Canadian Renewable Energy Association (CanREA), recognizing Boralex and SNGRDC as key players in delivering impactful, industry-leading solutions
• Community partnerships:
  • Codeveloped with Six Nations of the Grand River Development Corporation (SNGRDC)
  • Supporting Haldimand County through a Community Benefit Agreement.
• Innovative technology:
  • Installed capacity of 300 MW / 1,200 MWh, enabling up to four hours of continuous full-power delivery to the grid.
  • 334 Tesla Megapack 2XL units — fully integrated, utility-scale lithium-ion battery systems.
• Ontario grid stabilization and reliability:
  • As a large-scale storage site, Hagersville plays a critical role in stabilizing the grid and maximizing renewable energy integration, by allowing flexibility to match intermittent renewables with the required demand.
  • Hagersville helps meet the energy capacity needs identified by Ontario’s Independent Electricity System Operator (IESO) and strengthens overall system reliability.

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