The Oneida Energy Storage Project in Ontario has officially become Canada’s largest battery energy storage facility—and a turning point in the country’s clean energy future. Located in Haldimand County, the site now operates with 278 Tesla Megapacks, delivering 250 MW of power and storing 1,000 MWh of energy. This single project has nearly doubled Ontario’s storage capacity, allowing the province to store clean energy like hydro and nuclear during low-demand times and release it when demand spikes. Coming online ahead of schedule and under its original $800 million budget, the project strengthens Ontario’s grid, which is already over 90% emissions-free.
The environmental and social impacts of Oneida are just as significant. It’s expected to prevent up to 4.1 million tonnes of carbon emissions over its lifetime—comparable to removing 40,000 cars from the road each year. But perhaps most notably, Oneida stands out for its unique collaboration: the project is co-led by the Six Nations of the Grand River alongside Northland Power and other partners, including government support from Natural Resources Canada and the Canada Infrastructure Bank. It sets a new benchmark for how Indigenous leadership and public-private partnerships can drive Canada’s clean energy transition. More