FAQs

1. What is a battery energy storage system (BESS)?

A battery energy storage system stores electricity for use at a later time. It charges when electricity is abundant or inexpensive, and discharges when demand is high, helping to balance supply and demand on the grid.

2. Why are battery storage projects important?

Battery storage supports Ontario’s clean energy transition by:

Improving reliability and grid stability
Reducing reliance on fossil-fuel peaking plants
Enabling greater use of renewable energy (solar and wind)
Supporting community energy resilience during outages.

3. Why is PUC proposing these projects?

Ontario’s electricity demand is increasing, and the province needs more capacity to ensure reliable service. The IESO’s LT2 procurement program encourages local utilities to develop storage projects that support grid stability and enable more renewable energy use. These projects position Sault Ste. Marie as a leader in clean, reliable energy.

4. What types of batteries will be used?

The proposed systems will use lithium-iron phosphate battery technology, the most widely used and proven solution for grid-scale energy storage worldwide. These systems are designed with multiple layers of safety, including monitoring, cooling, and fire suppression systems.

5. Are there any safety concerns with battery storage?

Safety is a top priority. All systems are designed to meet strict standards; PUC is working directly with the Sault Ste. Marie Fire Services and regulatory authorities to ensure emergency response plans and safety protocols are in place before construction begins.

6. Are BESS systems noisy or visible?

Noise is minimal - similar to background traffic or a household air conditioner. Units are housed in quiet, climate-controlled containers with noise barriers if required. Landscaping and fencing minimize visual impact.

7. How will this project affect my property or neighbourhood?

PUC is committed to minimizing visual, noise, and environmental impacts. Each site will include buffer landscaping and fencing where necessary. We are committed to working with residents on these site plan details. The SSM BESS Project will consist of lithium-iron phosphate battery cells connected in stacks and installed inside an enclosed area, like a shipping container or a small enclosure. The enclosed area will also house the balance-of-plant equipment such as an inverter, a battery management system and a dedicated HVAC unit for proper ventilation. The battery packs feed inverters that connect to a transformer tied to the power grid.

8. What are the environmental impacts?

Battery systems have no emissions, no combustion and minimal water use. Environmental studies will assess land use, drainage and species protection before construction. At end of life, batteries are recycled through approved facilities.

9. How long do batteries last?

Typically, around 20 years, after which modules can be replaced or repurposed. The site can continue operating with updated equipment.

10. What is the timeline for these projects?

PUC plans to submit its proposal to the IESO under the LT2 procurement process later this year (2025). If the proposal is successful, construction could begin in 2028, with the systems to be operational by 2030.

11. Who is responsible for operating the BESS once built?

PUC, along with its development partners, will own and operate the facilities. Local operations will be supported by trained staff based in Sault Ste. Marie, ensuring community-based oversight and maintenance.

12. Where will the proposed battery sites be located?

Five sites have been identified across Sault Ste. Marie based on technical feasibility, land availability, and proximity to existing electrical infrastructure. Each location is being assessed for environmental, zoning, and community considerations.

13. How can community members provide feedback or stay informed?

Community input is valued and essential. You can:

Speak directly with project representatives at the open house
complete a feedback form (available at event and online)
Visit the project website www.pucbatterystorage.com for ongoing project updates and contact information.