Failure Event - US, AZ, Surprise - 19 Apr 2019

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Event DetailsSMW-Info-button.png
Location: US, AZ, Surprise
Capacity (MW): 2
Capacity (MWh): 2
Battery Module: LG Chem [NMC]
Integrator: AES/Fluence
Application: Volt Reg., PQ, Solar int.
Installation: Substation
Enclosure Type: Prefab
Event Date: 19 April 2019
System Age (yr): 2.1
Extent of Damage: Explosion
State During Accident:
Description: The cause was found to be an internal cell defect, which initiated a cascading thermal runaway event. Alarms and the clean agent fire suppression system activated but was not capable of preventing or stopping cascading thermal runaway in a BESS. Three hours after thermal runaway was intiated, firefighters opened a door to the battery container, agitating accumulated flammable gases and allowing the gases to contact a heat source or spark. Minutes later, an explosion occurred, injuring several firefighters.
Root Cause: Manufacturing
Failed Element: Cell/Module
Source: APS Investigation Report
Additional Resources:
Note: Missing values in this table reflect unknowns.

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