Assessing Hazards and Risk Mitigation for Utility-Scale Lithium-Ion Battery Energy Storage Systems was published by the SFPE Foundation in June 2026, authored primarily by Fire & Risk Alliance together with FRISSBE at the Slovenian National Building and Civil Engineering Institute (ZAG). It presents findings and considerations, not prescriptive requirements. It is the engineering science layer that jurisdictional codes implement.

Why it is the reference. The framework is written to address BESS fire, explosion and vent-gas hazards regardless of which codes and standards apply locally. Its own global review catalogues BESS regulations country by country, from GB standards in China to national guidelines across Europe and Australia, and finds no harmonized design standard on the global scale. Codes are national; the SFPE Foundation report is the framework read wherever NFPA is not the adopted code, and the basis on which performance-based designs are justified to any AHJ.

Detection is the first step of hazard mitigation once an initiating event has occurred. The framework ties detector requirements to the objective: a detector that actuates explosion control or thermal runaway propagation prevention must respond far faster than one that only notifies. Gas detection, off-gas/VOC detection and smoke detection are identified as the technologies able to catch an event during the venting stages, before flame detectors or sprinklers can see anything at all.

The framework does not stop at hydrogen. Hydrogen is the usual reference gas, but lithium-ion vent gas is a mixture that carries methane and ethylene alongside the hydrogen, and the framework treats the flammable gas mixture as the thing to be measured. That single sentence is the foundation of the mixture criterion.

• Gas composition is an engineering deliverable. The framework's detection guidance states that an understanding of the lithium-ion gas composition is vital in selecting and calibrating gas detectors. That makes the assumed composition a documented engineering deliverable, not a datasheet footnote. A detector calibrated to one reference gas answers the mixture question through assumed cross-sensitivity conversions that must be defended per project.
• Listed where standards exist; emerging technologies need case-by-case acceptance. The framework separates listed and approved detection equipment from emerging technologies such as off-gas/VOC detection, where documented performance data, third-party evaluation and AHJ acceptance are needed. For gas and vapour detectors, the product standard is UL 2075. This line is exactly why the flammable layer of a lithium-ion detection strategy must be a Listed device.
• Reliability follows the objective. Where detection actuates mitigation, the framework expects NFPA 72-consistent communication pathways, supervision, remote monitoring, and inspection, testing and maintenance including manufacturer calibration intervals: the lifecycle obligations that decide whether a detection layer is still in service years after commissioning.

How R-GAS-FLAMMABLE answers both. One device covers the off-gas layer and the flammable layer. Its Any Flammable gas channel responds to more than ten flammable gases and reports mixture %LEL directly, in engineering units, without a single-gas composition assumption. For increased performance, the channel supports optional cross-zoning amongst gas sensors, where an alarm is confirmed only when two different gas detection technologies are in agreement. It is Listed to UL 2075 by Intertek on methane, with UL 2075 hydrogen sensitivity testing completed: a dual-gas listed scope. Both gas channels are calibration-free across their service life. See R-GAS-FLAMMABLE.

In the United States, NFPA 855 (2026) and NFPA 69 implement the same logic as binding requirements: explosion control and prevention designed to NFPA 69 or a documented performance-based alternative, with combustible concentration reduction keeping the flammable mixture below 25% of its LFL, with continuous gas detection integral to it. NFPA 75, NFPA 76 and NFPA 70B govern the same hazard inside data centre and telecom buildings.

Everywhere else, the framework is what an engineer designs against and what an AHJ can be pointed to: a code-agnostic hazard basis for markets where no harmonized BESS standard exists. One framework, many code paths, one detection logic that satisfies them all: measure the mixture, document the composition, use listed devices where standards exist.

InfraSensing's listed, open and modular sensor platform has been used for more than fifteen years to protect mission critical infrastructure by detecting anomalies. Prevent-iON^® is the product line built on it for lithium-ion energy storage: environmental-envelope and thermography monitoring for the abuse stage, off-gas detection for the venting stage, and mixture %LEL flammable gas detection for the thermal runaway stage, on open protocols with no proprietary head end. The off-gas layer is a monitoring sensor for early off-gas detection. It is not a fire detection, life safety, or suppression initiating system.