Boralex Inc. and the Six Nations of the Grand River Development Corporation (SNGRDC) have commissioned the Hagersville Battery Energy Storage Park project – now the largest operating battery energy storage facility in Canada. Hagersville is located near Haldimand County in Ontario, and has 300 MW of power capacity paired with 1,200 MWh of battery energy storage. The project now offers up to four hours of continuous delivery of stored power to the Ontario grid.

Why is Hagersville Battery Energy Storage Park Project Important

Co-developed by Boralex and SNGRDC, and recently honored with the Innovative Canadian Clean Energy Project of the Year Award by the Canadian Renewable Energy Association (CanREA), the Hagersville BESS project is seen as a collaboration that strengthens grid reliability. This is while delivering economic and social value to local communities alongside others like PowerBank’s first battery storage project in Ontario, the SFF-06 BESS.

Additionally, by stabilizing the grid and supporting the adoption of intermittent renewable generation, Hagersville BESS plays a critical role in meeting capacity needs identified by the Independent Electricity System Operator (IESO).

The Hagersville Battery Energy Storage Park project will also include a 3-4 km transmission line to connect to the Hydro One transmission system via a 230-kilovolt interconnection.

Project Overview

Project Name: Hagersville Battery Energy Storage Park

Location: Near Hagersville in Haldimand County, Ontario, Canada

Capacity: 300 MW/1,200 MWh, utility-scale battery energy storage

Technology Use: 334 units of Tesla Megapack 2XL lithium-ion batteries

Status: Commercially commissioned in February 2026

Significance: Canada’s largest operating battery energy storage facility

BESS Role: Grid reliability, peak demand support, renewable integration

The Hagersville battery energy storage facility is a cornerstone in Ontario’s energy transition, allowing stored power to be dispatched during peak demand periods and providing essential grid flexibility.

Project Stakeholders, Contractors and their Roles

Boralex Inc. – Lead developer and co-owner. Boralex was involved in management of project development and integration of storage technology. The developer is now offering operational oversight.

Six Nations of the Grand River Development Corporation (SNGRDC) – Co-developer and Indigenous partner. Additionally served in community engagement, workforce development and economic participation.

Tesla, Inc. – Battery system supplier. Provided 334 Megapack 2XL units and integrated energy storage solutions.

A6N General Partnerships, Borea, Aecon – Civil and site construction partners who delivered key civil works on site with involvement of local Six Nations laborers.

Independent Electricity System Operator (IESO) – Grid authority. Identified capacity needs and facilitated project selection under Ontario’s energy procurement frameworks.

Haldimand County Municipality – Community stakeholder. Also offered local governance partnership and was the recipient of a Community Benefit Agreement.

Canadian Renewable Energy Association (CanREA) – The awarding body recognizing innovation at Hagersville Battery Energy Storage Park project.

Financial and Commercial Structure for Hagersville Battery Energy Storage Park Project

Hagersville Battery Energy Storage Park project was backed by approximately CA$538 million in project financing. This was secured by Boralex Inc. and the Six Nations of the Grand River Development Corporation.

A syndicate of financial institutions also acted as joint lead arrangers, providing a Green Loan financing structure. Participants in the financing included:

• Sumitomo Mitsui Banking Corporation
• KfW Ipex-Bank GMBH
• Korean Development Bank
• Crédit Industriel et Commercial, New York Branch
• DZ Bank

The financing package underpinned construction and commissioning. It also aligned debt and equity to support long-term operational success. Additionally, the project qualified for a Green Loan given its role in enabling renewable energy integration and emission reduction through grid-scale storage.

Impact and Outlook on the Hagersville Battery Energy Storage Park Project

The commissioning of Hagersville continues the scale-up of Boralex’s battery storage portfolio, bringing the company’s total operational storage capacity in North America to approximately 380 MW/1,520 MWh. This makes Boralex one of the Canada’s largest battery storage operators. SNGRDC’s combined portfolio also expands to 550 MW/2,200 MWh, making it the largest Indigenous holder of battery storage assets in North America.

Additional storage projects including the 125 MW/500 MWh Oxford project are under development in partnership with the Six Nations and Boralex. This is also a show of the duos’ commitment to grid flexibility and renewable integration across Ontario. Ontario is also at the center of another mega-development in the battery sector with PowerCo’s $7 billion gigafactory in St. Thomas.

Project partners plan to host an official inauguration event in Spring 2026. The event aims to bring together community members, Indigenous partners, political leaders, and industry stakeholders to commemorate this milestone in Canada’s energy transition.