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Home Home - Energy Storage
Canada’s Largest Battery Storage Facility Begins Operation Ahead of Schedule

Canada’s Largest Battery Storage Facility Begins Operation Ahead of Schedule

Anela DoksoBy Anela Dokso08/05/20252 Mins Read
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Canada’s energy storage landscape has reached a new milestone with the launch of the Oneida Energy Storage Project, the country’s largest operating battery facility at 250 MW / 1,000 MWh.

Located in Haldimand County, Ontario, the project began commercial operations ahead of schedule and below budget, establishing a new benchmark for utility-scale battery deployment in Canada.

Northland Power Inc., the majority owner with a 70% stake, led the development in partnership with Six Nations of the Grand River Development Corporation, NRStor Inc., Aecon Concessions, and Mississaugas of the Credit Business Corporation. The consortium completed the project at a final cost of approximately $700 million, $100 million below the original financial close estimate from 2023.

The Oneida facility marks a critical development as Ontario—and Canada more broadly—attempts to modernize its electricity grid to accommodate the intermittency of growing wind and solar portfolios. By absorbing excess generation and discharging during peak demand, battery storage systems like Oneida are expected to reduce reliance on gas peakers and enhance grid flexibility.

Notably, the facility’s development involved close cooperation with Indigenous communities. Northland will now turn its focus to other major infrastructure projects in its pipeline, including the 1.1 GW Baltic Power offshore wind farm in Poland and the 1.0 GW Hai Long offshore wind development in Taiwan—both of which are expected to come online later this decade.


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