Battery safety standards now drive project costs, not just tech
The gist
Battery safety rules now drive up project costs as much as the tech itself, reshaping the economics of energy storage after a wave of headline-grabbing fires.
What to know
- Before 2016, battery storage relied on piecemeal codes and component checks—until UL 9540 set an integrated safety standard for whole systems.
- New York’s fire code and Europe’s 2023/1542 regulation now force developers to budget for certifications, inspections, retrofits, and higher insurance—costs beyond just buying batteries.
- High-profile fires like Moss Landing’s $400M loss have made strict compliance non-negotiable, with insurance, project approval, and system design all riding on passing new safety hurdles.
System-Level Safety Revolution
UL 9540 shifted battery safety from fragmented part-by-part checks to rigorous whole-system certification, closing dangerous gaps that once let hazards slip through.
Before 2016, stationary battery projects were regulated through general electrical, building, and fire codes, supplemented by certifications of individual components like batteries and inverters, rather than an integrated system rulebook. That fragmented approach left gaps in addressing hazards that emerge from how components interact within an integrated storage system, including behaviors such as thermal runaway and fire propagation, because compliance could show that parts were acceptable without proving the assembled energy storage system itself had been evaluated as a single safety-critical product.
The break came in 2016, when Underwriters Laboratories published ANSI/UL 9540, the first standard to certify energy storage systems as integrated products, replacing component-only evaluations and establishing a product-safety framework referenced by electrical and fire codes. That publication marked the shift from component checks to system-level certification for stationary storage, and its continuing role is visible in PR Newswire’s headline, “CSI's 2.3 MWh Mobile BESS Earns TÜV Certification to Applicable UL 9540 Requirements,” showing UL 9540 functioning as an applicable system-level safety requirement.
Insurance Hinges on Compliance
Mounting certification and retrofit demands are driving up insurance costs and reshaping project design, as new fire codes and high-profile incidents make safety compliance a make-or-break factor for battery developers.
Bankability now turns on whether developers can absorb safety compliance as an operating cost, not merely a procurement choice. According to Utility Dive, safety concerns are increasingly colliding with communities, and “Many of the group’s recommendations were subsequently incorporated into New York’s updated Fire Code, which took effect in January 2026”; New York’s Inter-Agency Fire Safety Working Group, created in 2023, also “inspected 57 large, operating battery storage projects,” producing lessons on inspections and emergency coordination, while the state’s 6-gigawatt-by-2030 target will require communities to have the technical resources and clear standards to approve projects.
Those compliance demands are now feeding directly into insurance and retrofit economics. Dr Daniel Joyeux said the first European battery regulation, 2023/1542, brings “different requirements to be met, particularly for fire safety at the module, pack and BESS levels,” with implementation in buildings regulated; Fili.vn added that after the 16/01/2025 Moss Landing fire, which led to evacuation of more than 1,200 residents, Vistra wrote off nearly US$400 million, while Solarif said fire-prevention, thermal-control protocols, BMS certification and stricter installation standards now shape insurability, premiums, and even spacing and engineering choices through UL 9540A and NFPA 855.