ESS Safety Assessment and NFPA Compliance

As global deployment of battery energy storage systems (BESS) continues to accelerate, safety expectations from authorities having jurisdiction (AHJs) are evolving rapidly.  

High-profile safety incidents and growing fire and explosion risks are driving stricter regulatory requirements, particularly in the 2026 update to NFPA 855.

UL Solutions provides third-party energy storage system (ESS) safety assessment services aligned with NFPA 855, NFPA 68 and NFPA 69 to help manufacturers, system integrators and developers manage complex compliance challenges and support faster project approvals. 

The latest edition of NFPA 855 (2026) introduces enhanced requirements that significantly increase both the technical rigor and documentation needed for ESS installations.

Key areas of focus include:

• Fire propagation prevention strategies
• Explosion prevention and protection methodologies
• System-level validation through testing to UL 9540A, the Standard for Energy Storage Systems and Equipment testing and Large-Scale Fire Testing (LSFT)
• Integration of NFPA 68 (deflagration venting) and NFPA 69 (explosion prevention systems)
• Expanded and detailed technical documentation

These updates are reshaping expectations for ESS permitting and approval, leading to:

• Longer AHJ review cycles
• Increased resubmissions
• Inconsistent code interpretations
• Greater regulatory uncertainty 

With UL Solutions ESS comprehensive assessment services, manufacturers, system integrators and developers can:

• Provide AHJs with clear, review-ready technical documentation
• Increase the likelihood of efficient and timely approvals
• Strengthen safety justification packages aligned with NFPA expectations
• Reduce project delays and rework through early gap identification
• Leverage trusted, third-party technical insights to support alignment among stakeholders and authorities

While UL Solutions does not issue formal certifications or declarations of compliance for NFPA standards, our assessments provide:

• Clear, data-driven evaluations
• Transparent methodologies aligned to industry standards
• Actionable insights to support decision-making

Our goal is to help you demonstrate compliance to safety requirements and facilitate smoother regulatory reviews.

UL Solutions ESS safety assessment services are designed for:

• BESS manufacturers
• System integrators and engineering, procurement and construction (EPC) professionals
• Renewable energy developers and project owners
• Engineering consultants and safety professionals

ESS technologies are scaling quickly, and so is the need to support safer installation and operation. UL Solutions helps bridge the gap between evolving standards and real-world deployment by providing:

• Experience and technical clarity
• Consistent interpretation of codes
• Respected third-party expertise