The Unseen Fire: Energy Storage's High-Stakes Race for Safety

MUNICH, GERMANY – June 30, 2026 – Beneath the polished surface of the global energy transition lies a simmering tension. As nations race to deploy massive solar and battery storage projects, the very technology powering this green revolution is facing a crucial test of safety and reliability. This challenge was brought into sharp focus at the inaugural PV & ESS Safety Industry Summit, hosted by Huawei Digital Power during Intersolar Europe, where a stark message emerged: the industry must move faster than its own fires.

The summit convened a cross-section of the energy ecosystem—engineers, regulators, insurers, and safety experts—to confront the escalating risks tied to Photovoltaic and Energy Storage Systems (PV+ESS). As Xia Hesheng, Vice President of Huawei Digital Power, stated unequivocally, "PV+ESS safety is not an option... it is the necessity." His words underscore a growing consensus that without a unified, proactive approach to safety, the financial and reputational viability of the entire renewable energy sector is at stake.

The Growing Pains of a Global Boom

The urgency is fueled by the sheer scale of deployment. While industry data shows the failure rate of battery systems has plummeted over 98% in the past six years, the explosive growth in installations means high-profile incidents are becoming more frequent and visible. Recent fires at storage facilities from New York to California have captured headlines, raising public concern and putting immense pressure on operators and manufacturers.

Experts at the summit were quick to point out that the problem is far more complex than isolated battery cell failures. Mikel Arrese-Igor, a Senior Energy Storage Engineer at DNV, revealed a critical statistic: "around 70% of BESS defects occurred at the system level." This finding is independently corroborated by industry audits, which show that the majority of manufacturing defects are found not in the batteries themselves, but in crucial supporting systems like fire suppression, thermal management, and auxiliary circuits. A faulty cooling system or a compromised circuit panel can be just as catastrophic as a thermal runaway event in a single cell.

This system-level complexity creates what Tom Hessels, an advisor at the Netherlands Institute for Public Safety (NIPV), called a core challenge of "information silos." In the event of a fire, first responders often lack critical data about the system's design and chemistry. Hessels called for the public release of UL 9540A test data, which details how fires propagate in specific systems, and for manufacturers to provide 24/7 support channels to bridge this dangerous information gap.

A Regulatory Scramble to Keep Pace

The industry isn't waiting for disaster to strike before acting. A global scramble is underway to update safety standards and regulations to match the technology's rapid evolution. Germany, a leader in the transition with 19 GW of battery storage capacity, serves as a key battleground. According to Gerrit Lührung of Germany's energy storage association, BVES, the industry must "overcome regulatory restrictions, comply with the new safety guidelines, and unlock system value." Recent updates to the country's VDE standards and the "Solar Peak Act" aim to streamline integration and incentivize storage, while BVES itself released updated fire safety guidelines in late 2025.

Across the Atlantic, the United States is making significant strides. The latest 2026 editions of NFPA 855 (Standard for the Installation of Stationary Energy Storage Systems) and UL 9540A (Test Method for Evaluating Thermal Runaway) are game-changers. For the first time, large-scale fire testing is becoming a mandatory requirement, pushing the industry to validate safety not just at the component or unit level, but at the full installation level. This directly addresses the concern raised by DNV's Arrese-Igor about validating designs against "chain-fire scenarios involving other non-battery surrounding enclosures."

This shift from component-level thinking to a holistic, ecosystem-wide approach was echoed by Bill Reaugh, a Principal Engineer at the German Electrical and Electronic Manufacturers' Association (VDE). "Safety must evolve from the component level to the ecosystem leveraging a Digital Trust Model," he argued, emphasizing that safety and security are a full-lifecycle, closed-loop process covering design, manufacturing, and operations.

From Defense to Offense: A New Safety Paradigm

In response to these challenges, technology providers are moving from purely defensive measures to a proactive, predictive safety posture. At the summit, Huawei Digital Power detailed its strategy to address what its Product Director, Zhu Jun, identified as four major challenges: thermal-runaway boundary breakdown, high-voltage insulation failure, grid disturbance, and a lack of digitalization.

The company's proposed solution is a multi-layered "passive protection + proactive warning" defense network. This integrates advanced material science, such as high-temperature-durable insulation, with sophisticated engineering like positive-pressure smoke exhaust to manage incidents. Crucially, it layers on AI-based early-warning technologies designed to detect anomalies before they can escalate. The goal, as Zhu explained, is to move the industry's risk management from simple "risk mitigation" to creating a truly "acceptable zone" of safety, where thermal runaway does not propagate even in extreme scenarios.

This philosophy of proactive defense is encapsulated in the newly released Grid-Forming ESS Safety White Paper. The document outlines a framework for quantitative safety assessment and an "attack-defense" testing system. The logic, as described, is to use data-driven approaches and simulated attacks to "promote defense through offense," creating a closed-loop feedback cycle that continuously improves R&D, regulation, and construction practices toward a unified safety paradigm.

The Financial Backstop: Re-engineering Risk

Ultimately, the most powerful driver of this safety evolution may be the financial sector. The insurance industry, which underwrites these multi-million-dollar projects, is no longer willing to accept a black-box approach to risk. Alastair Nicklin of insurance brokerage WTW advocated for a fundamental shift in the insurance industry's role, moving to a "design as risk control" paradigm.

This new model requires a granular, quantitative understanding of risk, calculating the "risk probability × loss severity" to build a comprehensive defense mechanism. This approach transforms the entire risk landscape. Physically, it means moving beyond simply mandating fire separation distances to ensuring containment within a micro-environment. Financially, it means shifting from basic equipment repair coverage to hedging against revenue interruption. Operationally, it demands a move from mere standards compliance to achieving "above-standard resilience." Insurers are becoming key arbiters of engineering quality, effectively forcing the industry to design, build, and operate safer systems from the ground up. This convergence of technology, regulation, and finance is forging a new path forward, one where the safety of our energy future is not left to chance, but is meticulously designed.