Key Takeaways
- The Napanee Battery Energy Storage System (BESS) is a 250‑megawatt facility capable of supplying electricity to up to 250,000 homes for four hours during peak demand.
- Completed on budget and roughly five weeks ahead of schedule, the $600 million project ranks among the largest battery‑storage installations in Canada.
- The system stores excess power from Ontario’s nuclear and hydro plants during low‑demand periods and discharges it when demand spikes, enhancing grid reliability.
- Construction generated about 120 jobs, while the operating facility sustains three long‑term positions, delivering direct economic benefits to the region.
- The project leverages a made‑in‑Ontario supply chain, including 72 medium‑voltage transformers built by Stein Industries in London and procurement through the Indigenous‑owned Nbisiing Power.
- It forms a cornerstone of Ontario’s Energy for Generations strategy and contributes to the province’s record‑setting competitive procurements that have secured nearly 3,000 MW of storage capacity.
- Stakeholders—including provincial ministers, municipal leaders, industry executives, and union representatives—praised the project for its reliability, affordability, and clean‑energy advantages.
- The Napanee BESS complements other major investments such as the Darlington refurbishment, reinforcing Ontario’s global leadership in nuclear and storage technologies.
Announcement and Timeliness
On May 19, 2026, Minister of Energy and Mines Stephen Lecce announced the successful completion and commencement of commercial operations of the Napanee Battery Energy Storage System (BESS). The project was delivered on budget and approximately five weeks ahead of the original schedule, underscoring the province’s ability to execute large‑scale energy infrastructure efficiently. Lecce highlighted that the facility represents a major step forward in strengthening Ontario’s clean electricity grid and securing eastern Ontario’s energy future, aligning with the government’s broader goal of building a more competitive, resilient, and self‑reliant economy. The early completion also demonstrates the effectiveness of the province’s competitive procurement processes and the readiness of industry partners to meet demanding timelines.
Technical Specifications and Capacity
The Napanee BESS boasts a rated power output of 250 megawatts (MW) and comprises 284 individual battery storage units, supported by transformer stations, transmission connection facilities, and ancillary equipment. This configuration enables the system to store and dispatch enough electricity to power up to 250,000 homes for as long as four hours during periods of peak demand. As one of the largest operating battery storage projects in Canada, the facility provides a substantial buffer that can be called upon when electricity consumption spikes, such as during extreme weather events or evening peak periods. The scale of the installation positions Ontario at the forefront of North American energy‑storage capability.
Role in Grid Reliability and Peak Demand Management
A core function of the Napanee BESS is to capture excess baseload generation—primarily from Ontario’s nuclear and hydroelectric plants—during times of low demand and store it for later use. When system demand rises, the stored energy is discharged back into the grid, helping to smooth fluctuations and maintain frequency stability. This capability reduces the need to fire up less‑efficient peaking generators, thereby lowering emissions and operational costs. By providing rapid‑response power, the BESS enhances overall grid resilience, particularly valuable as Ontario’s electricity demand is projected to grow by up to 90 percent by 2050. The facility thus acts as a critical tool for managing both routine peak loads and unexpected surges.
Economic Impact and Job Creation
During the development and construction phases, the Napanee BESS supported approximately 120 jobs spanning skilled trades, engineering, transportation, and equipment manufacturing. These positions provided good‑paying employment opportunities for local workers and contributed to regional economic activity. Once operational, the facility sustains three full‑time roles focused on long‑term operations, maintenance, and technical support, ensuring ongoing economic benefits for the community of Greater Napanee and the surrounding Hastings‑Lennox and Addington area. The project’s timely delivery also avoided potential cost overruns, preserving public funds and reinforcing confidence in large‑scale infrastructure investments.
Supply Chain and Indigenous Participation
The Napanee BESS underscores Ontario’s commitment to leveraging a made‑in‑Ontario supply chain. Notably, 72 medium‑voltage transformers essential to the system were fabricated at Stein Industries in London, Ontario. These components were procured through Nbisiing Power, an Indigenous‑owned business operating within Nipissing First Nation, highlighting the province’s dedication to fostering Indigenous economic participation in major energy projects. By sourcing key equipment domestically, the project not only supports local manufacturers but also reduces reliance on imported components, strengthening Ontario’s industrial base and ensuring greater control over project timelines and quality standards.
Strategic Context – Energy for Generations and Procurement Record
The Napanee BESS is a pivotal element of the government’s Energy for Generations framework, which seeks to secure reliable, affordable, and clean power for Ontario’s growing economy. It emerged from the Independent Electricity System Operator’s (IESO) Expedited Long‑Term 1 (ELT‑1) competitive procurement launched in 2022, a process that ultimately yielded the single largest battery‑storage procurement in Canadian history. Through the ELT‑1, the First Long‑Term Request for Proposals (LT1 RFP), and the Oneida Energy Storage Project, Ontario has secured almost 3,000 MW of battery storage capacity. Additionally, the province recently completed the energy stream of the first window of the Second Long‑Term Request for Proposals (LT2 RFP), procuring more than 1,100 MW of new electricity supply—the largest competitive energy procurement in Ontario’s history. These initiatives collectively illustrate a strategic push to diversify the generation mix while enhancing flexibility and resilience.
Complementary Projects – Darlington Refurbishment
The success of the Napanee BESS follows closely on the heels of another milestone: the on‑time, on‑budget completion of the Darlington nuclear refurbishment. That project is expected to generate roughly $90 billion in economic benefits and support 14,200 good‑paying jobs across the province. Together, the Darlington upgrades and the Napanee storage system exemplify Ontario’s integrated approach to leveraging its nuclear foundation while adding modern storage technology. The province’s ability to deliver complex nuclear projects on schedule and budget—ranking it first worldwide for on‑time, on‑budget nuclear builds—reinforces confidence in its broader energy strategy, including the expansion of nuclear, hydro, and storage assets to meet future demand.
Stakeholder Quotes and Endorsements
A broad coalition of leaders voiced strong approval for the Napanee BESS. Minister Lecce emphasized the project’s role in powering growth, protecting jobs, and keeping energy reliable and affordable. Associate Minister Sam Oosterhoff highlighted its contribution to keeping life affordable for families and rates competitive for industry. MPPs Ric Bresee, Steve Clark, John Jordan, and Tyler Allsopp praised the facility for supporting regional economic expansion, grid reliability, and the province’s Energy for Generations plan. Mayor Terry Richardson of Greater Napanee celebrated the project as a catalyst for community growth and quality‑of‑life improvements. Industry executives Tom Patterson (Atura Power) and Bob McCullough (Ameresco Canada) underscored the teamwork, expertise, and innovation that enabled early completion. Union representative Andrew Clunis of the Power Workers’ Union affirmed the project’s compatibility with a balanced energy approach, while CanREA President Vittoria Bellissimo likened storage to a “Swiss Army knife” for the grid. Energy Storage Canada’s Justin Rangooni and IESO CEO Lesley Gallinger both noted the project’s significance for grid resilience, competitiveness, and Ontario’s clean‑energy future.
Future Outlook and Significance for Ontario’s Energy Future
Looking ahead, the Napanee BESS will play an increasingly vital role as Ontario confronts rising electricity demand driven by population growth, electrification of transportation, and industrial expansion. The facility’s ability to provide rapid, flexible power will help the province manage peak periods without resorting to costly, carbon‑intensive generation. Moreover, the project demonstrates the viability of large‑scale storage as a cornerstone of a modern, low‑carbon grid, encouraging further investment in similar technologies. By pairing storage with Ontario’s robust nuclear and hydro base, the province is building a diversified, resilient electricity system capable of withstanding extreme weather, market fluctuations, and evolving policy landscapes. The Napanee BESS thus stands as a tangible example of how strategic infrastructure investments can deliver economic, environmental, and social benefits today while laying the groundwork for a sustainable energy future.
Conclusion
The completion of the Napanee Battery Energy Storage System marks a landmark achievement for Ontario’s energy sector. Delivered on budget and ahead of schedule, the 250‑MW facility provides substantial peak‑shaving capacity, supports local employment, leverages a domestic supply chain—including Indigenous partners—and aligns with the province’s long‑term Energy for Generations strategy. Complemented by the Darlington refurbishment and a series of record‑setting competitive procurements, the project reinforces Ontario’s reputation as a global leader in reliable, clean, and innovative electricity solutions. As demand continues to climb, assets like the Napanee BESS will be essential to ensuring that the province’s grid remains affordable, resilient, and capable of powering the homes, businesses, and communities of tomorrow.