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1600 MWh Production
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32,000 households Supplied with electricity
Technical data
- Battery technology8 Hour Battery Duration
- Battery capacity200 MW
Lennox energy storage project at a glance
Boralex, in partnership with Alderville First Nation, is proposing a battery energy storage system (BESS) project in the Town of Greater Napanee, Ontario. The Lennox Battery Energy Storage Project (the Project) is anticipated to have a capacity of up to 200 MW – equivalent to approximately 1600 MWh. The project will provide reliable power capacity by drawing and storing energy from the grid during off-peak periods and releasing it back to the Ontario grid when energy demand is at its peak.
- Boralex will continue to work with host communities, host towns, and local stakeholders to ensure the project is properly integrated into the community.
Boralex is Canada’s leading developer of BESS projects
After more than a decade of strong supply, Ontario has entered a period of emerging electricity system needs. To address this need, the Independent Electricity System Operator (IESO) is competitively securing 600 MW of capacity through several Long- Term Request for Proposals (LT RFP).
In 2022 the IESO held the expediated process, E-LT1 RFP, where Boralex was the leading awardee winning two contracts totalling 380 MW of Battery Energy Storage System (BESS) projects; the Hagersville Battery Energy Storage System Project (300MW for 4 hours/1200 MWH) and the Tilbury Energy Storage Project (80 MW for 4 hours/320 MWh). In 2024, Boralex was once again successful in the LT1 RFP, being awarded the Oxford Battery Energy Storage Project (125 MW for four hours/ 500 MWh).
In June 2025, the IESO launched the LT2 RFP and is seeking up to 600 MW of year-round capacity services on a maximum contract capacity basis. Boralex plans to submit the Lennox BESS project in this RFP. The IESO plans to announce the successful projects in June 2026.
If awarded a contact, commercial operation of this Project is planned for 2030.
Recent Updates
- Boralex is preparing the project to bid into the IESO Long Term 2 Request for Proposals (LT2 RFP) in December 2025. It is anticipated that the IESO will announce successful bidders in June 2026.
- Lennox Battery Energy Storage Inc. will be hosting an Open House on September 4, 2025 at South Fredericksburg Community Centre, 2478 County Road 8, Greater Napanee, Ontario.
- Boralex previously hosted an Open House for the Lennox BESS project in September 2023.
- Lennox Battery Energy Storage Project Inc. will be seeking municipal approval in the form of a Municipal Support Resolution on September 9, 2025.
- Boralex is looking for feedback on the proposed Project from stakeholders and Indigenous Nations. To provide feedback, please contact Lennox Battery Energy Storage Project Inc. (the Proponent) through our contact form of our reach out to one of our team members directly.
Understanding the Energy Storage Project of Lennox
The project will consist of containerized batteries, inverters, medium voltage transformers, gravel internal access roads, buried collector and communication cabling, a small transmission substation, and potential operations and maintenance building.
The final layout of the infrastructure within the Project’s footprint has yet to be confirmed and will be determined through additional engineering studies, equipment procurement, and an environmental assessment. The Project will connect to an existing Hydro One transmission line located east of the proposed Project.
Enhancing renewable energy integration into the grid
The project will provide reliable power capacity by drawing and storing energy from the grid during off-peak periods and releasing it back to the Ontario grid when energy demand is at its peak. The Project is expected to provide significant benefits to Ontario’s ratepayers by reducing the need and cost associated with using gas-fired power plants during times of peak demand as well as helping to clean Ontario’s electricity system.
Local context
After more than a decade of strong supply, Ontario has entered a period of emerging electricity system needs. To address this need, the Independent Electricity System Operator (IESO) is competitively securing 4,000 MW of capacity through the first Long- Term Request for Proposals (LT1 RFP). In 2022 the IESO held the expediated process, E-LT1 RFP, securing up to 1,500 MW of capacity, 930 MW to come from energy storage. Boralex was awarded 380 MW in the E-LT1 competitive process. The IESO is now securing up to 2,500 MW of capacity through the LT1 RFP, of which 1,600 MW is be procured from energy storage.
Latest documents on Lennox BESS project
Frequently asked questions (FAQ)
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Battery storage, or battery energy storage systems, are devices that enable energy from power sources, like hydroelectric, wind, and even the electrical grid itself, to be stored and then released when customers need power most. Lithium-ion batteries, which are used in mobile phones and electric cars, are currently the most-used storage technology for large scale energy storage projects to help electricity grids ensure a reliable supply of energy.
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Battery energy storage technology has a key part to play in ensuring homes and businesses can be powered, even when the sun is not shining, or the wind has stopped blowing. The energy system must match energy supply with customer demand. Battery energy storage systems charge up when energy sources are producing more energy than customers need and discharge during times of peak demand to provide a reliable, steady supply of energy.
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Battery energy storage systems are considerably more advanced than the batteries you keep in your kitchen drawer or insert in toys and other electronics. A battery energy storage system can be charged by electricity generated from renewable energy, like wind and hydroelectric power, as well as drawing and storing energy from the grid during off-peak periods.
Intelligent battery software uses algorithms to coordinate energy production. Computerized control systems are used to decide when to store the energy to provide reserves or release it to the grid. Energy is released from the battery energy storage system during times of peak demand, keeping costs down and electricity flowing.
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A battery energy storage system (BESS)project would consist of containerized batteries, inverters, medium voltage transformers, gravel internal access roads, buried collector and communication cabling, a transmission substation, potential garage and operations and maintenance building, and connect to either a transmission system or distribution system, depending on the system of the project.
The proposed Lennox BESS project will also connect to an existing Hydro One transmission line located east of the proposed project.
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The Project will contribute to the fight against climate change by mitigating the variability of renewable energy production and the cycling of natural gas facilities. Leveling this variability helps ensure the reliability and stability of the electricity grid as it fosters the penetration of renewable energies. A project like this also helps to reduce harmful emissions as it lightens the load of traditional energy generation systems that rely on fossil fuels, such as gas-fired power plants.
Potential environmental effects will be determined during the Class Environmental Assessment (Class EA) for Transmission Facilities in accordance with the Ontario Environmental Assessment Act. The Class EA is a streamlined process for transmission projects anticipated to have a predictable range of environmental effects that can feasibly be mitigated with protection measures. More information about the Class EA can be found on the Hydro One website here.