Energy storage fundamentally improves the way we generate, deliver, and consume electricity. Energy storage helps during emergencies like power outages from storms, equipment failures and, accidents. But the game-changing nature of energy storage is its ability to balance power supply and demand instantaneously – within milliseconds – which makes power networks more resilient, efficient, and cleaner than ever before.

BESS systems are considerably smaller footprint compared to other clean technologies such as solar or wind farms. On average, a 25MW BESS system occupies 1 acre of land.

BESS systems are considerably smaller footprint compared to other clean technologies such as solar or wind farms. On average, a 25MW BESS system occupies 1 acre of land.

What accredited safety standards will the BESS comply with?

BESS have to apply with municipal, provincial and national permitting and codes and standards. The following is a non-exhaustive list of industry standards our Project will comply with:

• UL 9540 Standard for Energy Storage Systems and Equipment

• UL 9540A (Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems)

• National & Provincial Building Code

• National Fire Code Canada

• Underwriters Laboratories of Canada

• NECB 2017 National Energy Code of Canada for Buildings

• ULC (Underwriters Laboratories of Canada)

• UL 1741 Standard for Inverters, Converters, Controllers, and Interconnections

• UL 1973 Standard for Batteries for Use in Stationary, Vehicle Auxiliary Power and Light Electric Rail (LER)

BESS are certified to UL9540 and UL9540A standards to prevent fire spread and suppression at the cell and the BESS system level. BESS enclosures have built-in fire suppression system (FSS) solutions. The FSS system is composed of smoke detectors, gas detectors and aerosols, whose main function is to prevent fire spread in time when any open flame signal or gas signal appears in the battery system and send out an emergency fire alert signal to the EMS system.

These BESS do not use lead acid batteries, and therefore do not leak.

Mechanical failures include physical damage that could create heat or a fire. Hazards associated with lithium-ion battery energy storage systems are centred on the flammable organic electrolyte and its highly reactive electrodes. However, if the batteries are punctured, there is a risk of electrolytes being exposed to air, which will result in a chemical reaction, leading to thermal runaway and combustion.

Other potentially hazardous wastes would include fire residue, debris, and fire extinguishing agents leading to contamination of soil and underground water via leaching, burying, dissolution, infiltration and runoff. The management of these risks starts at the cell level, with the selection of battery chemistry, and compliance with local AHJs and global certifications. This is where UL9540A certification becomes critical to BESS projects. Any other hazardous leaks will be contained in the enclosure.

BESS systems are subject to third-party certification to ensure they comply with all of the required codes and standards.

BESS facilities have an expected lifespan of 22 years, or more, with equipment replacement and repowering. At the time of decommissioning, the installed components will be removed and reused/recycled, where possible, and the site restored. All removal of equipment will be done per the applicable regulations and manufacturer recommendations. The below summarizes the decommissioning procedure that would be enacted at the end of project life for each component.

BESS – Disconnect all above-ground wirings. Remove all BESS enclosures and support structures.

Medium Voltage (MV) Stations, Substation – Disconnect and remove all electrical equipment. Remove the inverter and associated equipment. Remove high-voltage substation transformer. Remove concrete foundations for MV Stations and substation components.

Access roads and other components – Consult with the property owner to determine if access roads should be left in place for their continued use. If roads are to be removed, the aggregate materials will be excavated by a backhoe/front-end loader, along with any underlying geotextile fabric. Compacted areas restored.

Underground cables – Underground electrical lines running between the inverters and the substation will be removed. All foundation materials will be removed.