Myers Emergency & Power Systems has announced that its EnerShed 2.0 Battery Energy Storage System (BESS) has successfully passed the UL 9540A 6th Edition Large-Scale Fire Test, a key safety benchmark conducted by CSA Group.
The company said it is the first in North America to achieve this milestone under the updated standard, which was published in March 2026 and introduces expanded requirements for validating fire safety performance in battery energy storage systems.
“At Myers, safety is not a checkbox. It is a core engineering principle that shapes every product decision we make,” said Troy Renken, Chief Product Officer of Myers. “Successfully completing the UL 9540A 6th Edition Large-Scale Fire Test reflects our commitment to designing systems that customers and communities can trust, while also staying ahead of evolving codes and standards. Being the first in our industry to achieve this milestone cements Myers’ position as an emerging market leader in the BESS category.”
The UL 9540A 6th Edition standard introduces more stringent requirements, including formal integration of Large-Scale Fire Testing (LSFT) into certification protocols. It requires manufacturers to demonstrate that thermal runaway in one battery unit does not propagate to adjacent units under defined conditions.
To validate compliance, testing was conducted at Safe Laboratories under the observation of CSA Group and independent fire safety experts from Atar Fire, a fire protection engineering firm.
“As BESS safety standards continue to evolve, large-scale fire testing under UL 9540A, 6th Edition is critical to demonstrating system compliance under real-world fire conditions,” said Dana Parmenter, Commercial Vice President, Industrial at CSA Group. “To support these requirements, CSA Group has invested in specialized capabilities and technical expertise to deliver rigorous, high-precision large-scale fire testing. Working with Myers, CSA Group supported and observed this testing, helping generate system-level fire performance data for the EnerShed 2.0 system to support safety validation and the evaluation of fire propagation risk.”
EnerShed 2.0 was tested under high-stress conditions, including unit spacing of just two inches apart. The system’s air-cooled architecture, passive barriers, and open module design were evaluated under scenarios intended to replicate extreme real-world fire events.
According to the results, no fire propagation occurred between adjacent enclosures—meeting the most stringent outcome defined by the standard.
“Large-scale fire testing represents the highest level of system safety validation in the battery energy storage industry,” said Nicholas Bartlett, P.E., Senior Fire Protection Engineer at Atar Fire. “EnerShed 2.0’s unique design required a demanding test protocol intended to simulate worst-case scenarios. Myers’ decision to conduct open-door testing under these extreme conditions reflects a strong commitment to both transparency and safety at the highest levels, and we recognize their successful completion of testing under the 6th Edition standard.”
Passing the UL 9540A 6th Edition LSFT represents a key step toward broader commercialization of EnerShed 2.0. The company said the results are expected to support permitting and approval processes as authorities having jurisdiction, insurers, and developers increasingly rely on large-scale fire test data to evaluate deployment safety.
The achievement strengthens Myers’ positioning in the growing battery energy storage market, where fire safety and compliance testing have become central to project development timelines and investment decisions.
Myers Emergency & Power Systems said the milestone reinforces its focus on engineering safety, regulatory alignment, and commercialization of next-generation BESS technology.
