Battery storage failure reported at solar integration site in Flagstaff, Arizona
EIR-0679Provisional entry. Confirmed: location, date, capacity and integrator are recorded in the EPRI failure database. Not yet known: the nature or cause of the failure, whether there were injuries or an emergency response, or the extent of damage and downtime. No further update is scheduled; the entry stays provisional until new information is published.
On 26 November 2012 a failure was recorded at a battery energy storage system integrated with a solar installation in Flagstaff, Arizona, United States. The system, rated at 0.5 MW and 1.5 MWh, was approximately 1.5 years old at the time of the event. The system was integrated by Electrovaya as part of a solar integration application. The source consulted for this entry is a database record listing the location, date, capacity, system age and integrator, but it does not describe the nature of the failure, its cause, any injuries, emergency response, or the extent of damage or downtime. No further detail on the sequence of events is available from the material reviewed.
- Operators and integrators should maintain detailed public incident records including cause, response and outcome so that lessons can be shared across the industry.
- Early-life battery storage systems, even within the first two years of operation, can experience failures, supporting the case for close monitoring during early operational years.
- Solar-storage hybrid sites should have failure reporting protocols that capture root cause and consequences to allow meaningful learning for future projects.
Published 2026-09-11. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.