System-Level Flaws Plague Battery Storage as Germany Hits 19 GWh Capacity
30.06.2026 - 20:33:04 | boerse-global.de
Germany’s installed capacity for utility-scale battery storage has reached 19 gigawatt-hours, but the rapid expansion is exposing critical safety gaps that industry experts say cannot be fixed by better components alone. At a summit held on 24 June during Intersolar Europe 2026 in Munich, representatives from industry, testing institutes and trade associations warned that roughly 70 percent of all defects in photovoltaic and storage systems occur at the system level, not in individual parts.
Mikel Arrese-Igor of the testing firm DNV presented the finding, which emerged from real-world audits. The result underscores a structural vulnerability as large-scale battery projects multiply: even if every single cell, inverter and connector is flawless, the way they are integrated and operated can still lead to failures. Huawei Digital Power, together with several industry partners, used the summit to release a white paper on the safety of grid-forming energy storage systems. The document is intended as a guide for improving technical reliability of installations that actively help stabilise power grids.
The quality problem extends beyond system integration. Separate data from another industry gathering held in Munich on the same day revealed that factory audits at major Tier-1 battery suppliers turned up quality deficiencies across all production phases. Both sets of findings point to a need for comprehensive quality control as a precondition for project bankability, experts said. Xia Hesheng of Huawei Digital Power stressed that safety is a fundamental requirement for the success of the energy transition and called for cross-disciplinary cooperation to tackle complex safety challenges systematically.
Insurance coverage has not kept pace with the technological risks. Gerrit Lührung of the German Energy Storage Systems Association (BVES) and Alastair Nicklin from insurance broker WTW noted a widening mismatch between the hazards embedded in modern storage plants and the protection available from insurers. They urged closer coordination between system developers and the insurance industry to close the gap.
Standardised testing procedures are seen as a key remedy. Participants including Bill Reaugh of the VDE and Tom Hessels of the Dutch Institute for Public Safety (NIPV) discussed how common safety levels covering fire protection and operational safety under extreme conditions could be established through uniform test regimes. Without such standards, both bankability and insurability will remain under strain as Germany’s storage fleet grows.
