Boralex and the Six Nations of the Grand River Development Corporation (SNGRDC) have commissioned the Hagersville Battery Energy Storage Park in Haldimand County, Ontario, Canada.
The site features 300MW/1.2 gigawatt-hours (GWh) of installed capacity, providing up to four hours of continuous full-power supply to the provincial grid.
This project brings Boralex’s total operational storage capacity to 380MW/1.52GWh across its Canadian facilities, while SNGRDC reaches a total of 550MW/2.2GWh.
The Hagersville facility was jointly developed by Boralex and SNGRDC, building on their previous collaborations in renewable energy projects.
The initiative involved local Six Nations labour through civil works delivered by A6N General Partnerships, a company majority-owned by SNGRDC along with Aecon.
Construction partner Borea also contributed throughout the development process.
The installation uses 334 Tesla Megapack 2XL units, which are fully integrated lithium-ion battery systems designed for utility-scale storage.
Hagersville is intended to address Ontario’s electricity system needs by stabilising the grid and supporting integration of intermittent renewable sources.
This role aligns with requirements identified by Ontario’s Independent Electricity System Operator.
Boralex president and CEO Patrick Decostre said: “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 strengthens grid reliability and accelerates the integration of renewable energy across North America – at the pace required to support economic growth, energy independence and decarbonisation.”
Hagersville is SNGRDC's second battery storage facility to reach commercial operation, with four additional projects under development.
SNGRDC now holds 1GW of battery storage capacity in North America.
A formal inauguration event for Hagersville is scheduled for spring 2026 and will include participation from community members, indigenous partners, political representatives and media.
