Early utility scale battery storage container destroyed by fire following cell over-discharge
2012Published 1 May 2026Responsible editor: Chief Editor
- Where
- substation in North America
- What
- fire destroyed early-generation lithium-ion battery energy storage system
- Injuries
- None reported
- Cause
- Not reported
- Outcome
- complete system was lost
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What happened
In November 2012, a fire destroyed an early-generation lithium-ion battery energy storage system at a substation in North America. The system was owned and operated by an investor-owned utility. It was housed in a single container and consisted of 16 cabinets, each containing 24 lithium-ion cells. The complete system was lost. No injuries were reported. The event is one of the earliest documented utility scale lithium-ion battery storage fires in the region, and its investigation findings were later referred to in regulatory commentary following a further battery storage incident in the same jurisdiction several years afterwards.
Contributing factors
According to the investigation findings as described in later public commentary, a single battery cell experienced severe over-discharge. The degraded cell affected a neighbouring cell, initiating thermal propagation that spread through the cabinets and resulted in loss of the system. Reporting indicates that the underlying cause of the initial over-discharge, for example a battery management system fault, a control system fault or another mechanism, was examined in the formal investigation, the findings of which were made available internally and to the relevant regulator rather than published in full.
Lessons learned
- Over-discharge of one lithium-ion cell can trigger thermal propagation to neighbouring cells, so operators should verify low-voltage protection limits at commissioning and after any change.
- Absence of thermal barriers between cells and cabinets allows one fault to destroy the whole enclosure, so check cell-to-cell and module-to-module separation on older systems.
- Investigation findings on early systems may be needed years later by regulators, so retain full records and design basis documents for the asset life.
More lessons on spacing, layout and fire spread, emergency response and public communication, from every incident on the register.
Not yet known
- Underlying cause of the initial over-discharge
- Battery cell model and age
- Cost of the damage
- Duration of supply outage
This entry is updated when these are reported. Get an alert for the next one like it.
Source
Published 2026-05-01. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.
