Fire code compliance is the layer of BESS permitting that developers most frequently underestimate and fire marshals most frequently over-condition. It operates on a separate track from land use zoning, building permits, and environmental review — and it has its own standards, its own reviewing authority, and its own capacity to delay or kill a project.
The governing standard is NFPA 855: Standard for the Installation of Stationary Energy Storage Systems. The 2026 edition, released in late 2025, significantly raised the bar for fire testing, hazard analysis, and emergency response planning. If you’re permitting a BESS project in 2026 or beyond, this is the standard your Authority Having Jurisdiction (AHJ) will reference — whether they’ve formally adopted it or not.
Fire code review doesn’t follow the same process as zoning or building permits. In most jurisdictions, the fire marshal or fire department reviews BESS applications independently. They apply their own codes (typically NFPA 855 or the International Fire Code), set their own conditions, and can require modifications that conflict with what the planning commission approved.
This creates a coordination problem. A planning commission might approve a site plan with specific setbacks, only for the fire marshal to require larger buffers based on fire testing data. Or a building permit might be issued before the fire department has completed its review. Developers who don’t engage the fire marshal early — ideally before the zoning application is submitted — risk redesigning their site layout after other approvals are already in place.
NFPA 855 provides the framework for siting, installing, and managing stationary energy storage systems. It covers setbacks and spacing between battery enclosures, fire detection and suppression requirements, explosion prevention and control, emergency response planning, and Hazard Mitigation Analysis (HMA) requirements.
The standard applies to BESS installations of all sizes, but the requirements scale with the system’s stored energy capacity. Smaller systems face fewer prescriptive requirements, while larger utility-scale installations trigger comprehensive HMA, fire testing, and emergency planning obligations.
Even in jurisdictions that haven’t formally adopted NFPA 855, fire marshals routinely reference it as the basis for their review. It functions as the de facto national standard for BESS fire safety.
The 2026 edition of NFPA 855 represents the most significant update since the standard was first published in 2020. The changes reflect lessons learned from real-world incidents — particularly the Moss Landing fire in January 2025 — and a growing recognition that component-level testing alone is insufficient to assess system-level risks.
Hazard Mitigation Analysis is now the default. In previous editions, an HMA was required only under specific circumstances. The 2026 edition makes HMA the baseline expectation for most BESS installations unless explicitly exempted. An HMA must be performed by a registered Professional Engineer and reviewed by the AHJ.
Large-scale fire testing is now explicitly required alongside UL 9540A testing. Previous editions treated large-scale testing as informational. The 2026 edition requires that systems demonstrate they can withstand and contain severe thermal runaway events at the installation level, not just at the cell or module level.
Explosion control and prevention requirements are new. BESS installations must incorporate explosion control systems designed per NFPA 69, or demonstrate through performance-based testing that explosion risks are managed.
Emergency response planning requirements are more prescriptive. The 2026 edition requires a formal Emergency Response Plan covering mitigation, preparedness, response, and recovery phases. Annual plan review and AHJ notification of training exercises are now mandatory.
The Authority Having Jurisdiction — typically the local fire marshal or fire department — has significant discretion in how they apply NFPA 855. This is by design. NFPA standards provide a framework, but the AHJ adapts it to local conditions, existing fire department capabilities, and the specific characteristics of the proposed installation.
In practice, this means two AHJs reviewing identical BESS applications can reach different conclusions about required setbacks, suppression systems, and access road specifications. Developers who build a relationship with the AHJ early — before submitting the formal application — get better outcomes. Pre-application meetings allow you to understand the AHJ’s priorities, address concerns proactively, and avoid the costly cycle of submit-reject-revise.
A common failure mode is treating the fire code review as a box-checking exercise. AHJs who feel they’re being handed a compliance package without genuine engagement tend to impose more conservative conditions. AHJs who feel they’re being consulted as partners tend to work toward mutually acceptable solutions.
Fire code compliance doesn’t exist in isolation. Setback requirements from NFPA 855 directly affect site layout, which affects the zoning site plan. If the fire marshal requires 20-meter buffers that the site plan didn’t account for, the project may need to return to the planning commission for a revised approval.
Similarly, NFPA 855’s emergency access road requirements can conflict with environmental setbacks from wetlands or stormwater management features. The fire department wants wide, paved access roads. The environmental agency wants to minimize impervious surfaces. These conflicts need to be identified and resolved early, before either agency has issued their approval.
The most efficient approach is to engage the fire marshal, planning staff, and environmental reviewers simultaneously — either through a joint pre-application meeting or by sharing preliminary site plans with all three agencies before filing formal applications. For a comprehensive guide to coordinating all layers of BESS permitting, see Carina Energy’s BESS Permitting Guide at carina energy.
Carina Energy is a boutique owner’s representative firm specializing in BESS permitting and development. If you need help navigating fire code compliance and AHJ coordination for a BESS project, visit carina energy.
The guide above covers the fundamentals. Subscribers to our BESS Permitting Intelligence Newsletter get the operational detail: BESS FEOC compliance updates, OEM manufacturing moves, supplier landscape shifts, and tariff developments. The Carina Dispatch also includes BESS moratorium tracking across 150+ jurisdictions and interconnection queue trends across all seven US power markets. One newsletter, three intelligence layers.
READ BY HUNDREDS OF BESS PLAYERS
