NAPANEE BESS CONNECTS TO THE GRID AHEAD OF SCHEDULE AND ON BUDGET

OAKVILLE, Ont. (June 5, 2026) — The 250-megawatt Napanee Battery Energy Storage System (BESS), developed as a joint venture by Atura Power and Ameresco Canada, is now in service – on budget and ahead of schedule

Ontario Minister of Energy and Mines Stephen Lecce was in the Town of Greater Napanee, Ont., on May 19 to announce completion of the BESS project, which can store and distribute up to 250-megawatts of electricity for up to four hours during peak demand periods. That is enough to power an estimated 250,000 homes.

“Ontario is building the infrastructure needed to power growth, protect jobs, and keep energy reliable and affordable for families,” said Stephen Lecce, Minister of Energy and Mines. “The completion of the Napanee Battery Energy Storage System is a major step forward in strengthening our clean electricity grid and securing eastern Ontario’s energy future. This project will help power up to 250,000 homes in eastern Ontario during peak demand, support three highly-skilled jobs and reinforce our plan to build a more competitive, resilient and self-reliant province.”

The team delivered the $600-million project on-budget and approximately five weeks ahead of schedule. It is one of the largest operating battery energy storage systems in Canada and supported up to 120 Ontario-based construction jobs and significant activity across engineering, transportation and manufacturing supply chains.

“We are investing in modern technologies that strengthen system reliability and enable the integration of more intermittent non-emitting generation while maintaining the dependable electricity supply Ontarians rely on every day,” said Tom Patterson, Atura Power’s President and CEO. “Delivering this project ahead of schedule and on budget reflects the skill and dedication of our project team, including our joint venture partner Ameresco Canada, and the many trades and engineering professionals who made it possible.”

Napanee BESS helps balance and improve the efficiency of Ontario’s electricity system by charging during periods of low demand and supplying electricity back to the system when demand is high.

The project was selected through the IESO’s Expedited Long-Term procurement process and supports the province’s long-term plan to ensure reliable, affordable and clean electricity for Ontario.

About Atura Power

Atura Power, subsidiary of Ontario Power Generation, is a diversified energy company that plays a vital role in supplying and balancing Ontario’s electricity system. As owners and operators of the province's largest fleet of combined-cycle gas turbine generating stations, our flexible power helps meet peak demand and ensures a reliable supply of electricity when Ontarians need it most. Atura Power is also developing a low-carbon hydrogen production facility to help the province move towards a cleaner energy future. Learn more at aturapower.com.

-30-