Envision Energy, a pioneer in green technology worldwide, has raised the standard for system resilience, safety, and environmental responsibility by successfully completing a ground-breaking large-scale fire test for their smart energy storage system. The test, which was carried out under the close supervision of the Canadian Standards Association (CSA Group), strategic partners, and North American Fire Protection Engineers (FPEs), fully complied with the strict CSA C800 standard. This standard was created to provide one of the most authoritative international safety benchmarks for energy storage and was developed with input from insurers, regulators, and industry experts.
World’s Densest BESS Setup: 5cm Tightest Spacing, Zero Fire Propagation in 49 Hours
By positioning four fully charged (100% SOC) 5MWh Envision Smart Energy Storage containers (A, B, C, and D) in an ultra-dense back-to-back, side-by-side configuration, only 5 centimeters apart, as opposed to the usual industry standard spacing of 3 to 5 meters, the test replicated the worst-case site conditions found in the real world. Because of the increased thermal coupling and restricted airflow, this configuration is the most energy-dense fire test layout yet tried, making it much more difficult. Crucially, there was no interference, and the burn was let to continue.
The test stretched the limits of the strictest safety regulations, yet the system demonstrated remarkable containment and robustness even under previously unheard-of levels of thermal stress and energy concentration. Container A reached a maximum temperature of 1,297°C after burning for 49 hours and 32 minutes. The neighboring containers B, C, and D’s interior battery temperatures, on the other hand, stayed steady at only 35°C, 44°C, and 43°C, respectively—much lower than our typical operating window.
During the combustion, container A notably remained structurally intact, exhibiting no collapse or deformation and unbroken sealing gaskets. The fact that there was no damage to nearby containers or fire spread was even more remarkable. Post-test checks revealed that all internal modules were completely functional and undamaged, and units B, C, and D were unharmed on the inside as well as the outside.
3-Hour Ignition Delay – Extended Window for Fire Response
Four battery cells in a modified pack, from which the nano-level thermal insulation had been removed, were subjected to high-power, synchronized heating in order to replicate the worst-case ignite situation. The ignition source was positioned in the middle of the container cluster, where there is the most chance of a fire spreading in all directions. Ignition took over three hours under these severe circumstances, which is more than 50% longer than usual. This provides a crucial opportunity for early identification and emergency treatment.
Zero Emission Fire Testing – New Benchmark for Environmental Safety
Environmental safety was also a key focus throughout the test. All combustion gases from the burning container A were captured by overhead smoke hoods, analyzed for composition, and fully neutralized through advanced treatment. The entire 49-hour test produced no odors, no emissions, and zero pollution, setting a new industry benchmark for clean and environmentally responsible fire testing in energy storage.
AI-Driven Safety & Full Lifecycle Asset Protection
Envision’s AI-powered Smart Energy Storage System offers superior safety even under extreme conditions. It integrates Envision’s proprietary high-safety battery cells within a robust three-layer safety architecture spanning cell, pack, and system levels. Coupled with AI-driven fire detection and active pack-level firefighting, the system isolates thermal events within a single container. To date, Envision’s storage systems have been deployed in over 300 projects worldwide with zero safety incidents.
This breakthrough fire test proves that even in highly unlikely fire scenarios, Envision’s Smart Energy Storage can fully contain risk within a single container. The quantifiable safety results provide insurers with greater confidence to underwrite storage assets, paving the way for broader commercial adoption and accelerating the transition to safe, large-scale energy storage.
