Quebec-based IPP Boralex and Six Nations of the Grand River Development Corporation (SNGRDC) have commissioned the 300MW/1,200MWh Hagersville Battery Energy Storage Park in Haldimand County, Ontario, CA.
Boralex claims the 1,200MWh project is now the largest operating battery energy storage system (BESS) facility in Canada.
In December 2024, Boralex and SNGRDC closed a CA$538 million (US$372.82 million) financing for Hagersville. Financing for the project was obtained from a banking syndicate composed of Sumitomo Mitsui Banking Corporation of Canada (SMBC), German KFW Ipex-Bank GMBH (KfW), the Korean Development Bank, French Crédit Industriel et Commercial, New York Branch et DZ Bank, all acting as joint lead arrangers.
During this project, Boralex and SNGRDC focused on engaging local Six Nations labourers. The companies partnered with construction partner Borea, bringing in A6N General Partnerships—majority-owned by SNGRDC with construction company Aecon—to handle civil work on site.
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Boralex claimed this collaboration enhanced local involvement and boosted economic benefits for the community.
Boralex also claimed that it is now Canada’s largest BESS operator, with the commissioning of Hagersville and the recently commissioned 80MW/320MWh Sanjgon BESS in the Municipality of Lakeshore, Ontario.
Sanjgon, formerly known as Tilbury, is a project that Boralex and Walpole Island First Nation announced a US$119 million financing for in 2025.
In partnership with Walpole Island First Nation, the project was renamed Sanjgon Battery Energy Storage. The name “Sanjgon,” derived from the Nishnaabemwin language, emphasizes the traditional storage practices of the Nation’s families.
Hagersville is SNGRDC’s second BESS facility to reach commercial operation. According to the corporation, SNGRDC is the largest Indigenous holder of battery storage assets in North America.
Boralex and SNGRDC’s 125MW/500MWh Oxford BESS is currently under development and expected to begin construction soon. The companies received the go-ahead from the Oxford City Council to move forward with the project in October 2025.
Regular readers of Energy-Storage.news may recall recent reporting on Potentia Renewables reaching financial close for the 1,644MWh Skyview 2 BESS in Ontario. Potentia claims it as the largest BESS project in Canada, and once operational, it would surpass Hagersville.
Construction began on Skyview 2 in November last year, with Canadian Solar subsidiary e-Storage supplying BESS equipment and providing engineering, procurement and construction (EPC) services.
The largest project in operation in the country today is thought to be Oneida Energy Storage, with 250MW output and 1,000MWh energy storage capacity (4-hour duration), also in Ontario. IPP Northland Power, which developed the Oneida project in partnership with Six Nations of the Grand River Development Corporation (SNGRDC), NRStor, Aecon Concessions and the Mississaugas of the Credit Business Corporation (MCBC), announced its start of commercial operations in May last year.
Ontario has implemented significant policy updates to include energy storage within its electricity infrastructure. The province’s Integrated Energy Plan seeks to boost storage capacity and grow transmission networks to support distributed storage solutions.
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