Ottawa Construction News staff writer
The Napanee Battery Energy Storage System is now in commercial operation, marking one of the largest battery storage projects in Canada and a significant expansion of Ontario’s electricity storage capacity.
The 250-megawatt (MW) facility can supply enough power for up to 250,000 homes for as long as four hours during peak demand periods. Valued at approximately $600 million, the project was selected through the Independent Electricity System Operator Expedited Long-Term 1 procurement process launched in 2022, part of what is described as the largest battery storage procurement in Canadian history.
Energy Minister Stephen Lecce said the project strengthens the province’s electricity system at a time of growing demand.
“Ontario is building the infrastructure needed to power growth, protect jobs, and keep energy reliable and affordable for families,” Lecce said. “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.”
Ontario’s electricity demand is forecast to rise by as much as 90 per cent by 2050, increasing the need for storage systems that can offset peak demand and help manage extreme weather events.
The Napanee facility includes 284 battery storage units, transformer stations, transmission connection infrastructure and ancillary components. It is designed to store electricity generated during low-demand periods — including output from Ontario’s nuclear fleet — and release it back to the grid when demand increases.
The project also highlights local supply chain involvement, including 72 medium-voltage transformers manufactured by Stein Industries and procured through Nbisiing Power.
“Through strong collaboration and a shared commitment to excellence, Atura Power and Ameresco worked closely with all project partners to successfully deliver this important energy infrastructure ahead of schedule,” said Bob McCullough.
“Reaching commercial operation early is a significant milestone and a clear reflection of the dedication, expertise, and teamwork across the entire project team. We’re proud to support Ontario’s energy future through coordinated efforts that prioritize reliability, innovation, and local impact.”
Construction and development of the facility supported about 120 jobs across skilled trades, engineering, transportation and manufacturing. The completed site is expected to support ongoing operational and technical employment in the region.
The project follows the refurbishment of the Darlington Nuclear Generating Station, another major Ontario energy infrastructure milestone completed on time and on budget.
Ontario officials say battery storage, nuclear refurbishment and hydro expansion are central to a broader strategy aimed at ensuring reliable, affordable electricity while supporting domestic supply chains and long-term economic growth.
“At Atura Power, 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.
“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.”
Vittoria Bellissimo, president and CEO of the Canadian Renewable Energy Association, said energy storage is becoming increasingly important for grid stability.
“Energy storage is the Swiss Army knife of the electricity system,” Bellissimo said. “It can store energy for later, step in when demand spikes, and keep the grid stable and costs down.”
