Update July 18, 2020
APS has posted a Final report on the McMicken Battery Energy Storage System Event Technical Analysis and Recommendations。 This is a very detailed report, worth a study by those who have a need for safe energy storage。 Much of the technical information also applies to batterpes used in electric vehicles and other smaller applications。
The factual conclusions reached in this investigation are as follows:
There were five main contributing factors that led to the explosion:
The full report is available on the APS website:
The Fire Department was called about 6 p.m. Friday (4/19/19) about smoke rising from the APS McMicken Energy Storage site. The responding firefighters were evaluating the lithium battery when there was an explosion that left the firefighters with serious chemical and chemical-inhalation burns. One of the firefighters was in critical condition at the Maricopa Medical Center's burn unit in Phoenix and in surgery until 1 a.m. before becoming stable.
This incident illustrates that utility scale battery systems can be very dangerous。 Further information is not available as of the posting of this article。 As more information becomes available, the Solar Center will provide updated coverage。
The battery system is one of two identical battery systems installed in late 2016 and became operational in early 2017.
There is a good article on these battery systems on the APS website at
The McMicken unit is contained at the head of the feeder in an existing substation。
Note, these are smaller, earlier batteries that those described in our earlier APS battery article: APS announces 'Solar after Sunset" battery storage inititative
Recent APS presentation slide on these systems, still no further incident details。
Still no report as of 7/5/20
Many others have taken note of this fire such as
Update July 18, 2020
APS has posted a Final report on the McMicken Battery Energy Storage System Event Technical Analysis and Recommendations.
See the full article: http://jfjd98.com/update-utility-solar-battery-fire-in-arizona
TEP customers intending to install a new PV system now need to check that their system can be safely installed and connected to TEP’s grid。
TEP now has service areas that are saturated with PV systems where new PV systems are subject to additional review and requirements under Arizona’s Distributed Generation Interconnection Rules. TEP has prepared DG Saturation Maps showing these areas.
This further described at
This requirement stems from the recent Distributed Generation Interconnection Rules issued by the Arizona Corporation Commission.
Further information is available at:大发体育Interconnection of Distributed Generation Facilities
Update: See the related article on tucson。com:
Tucson Electric Power (TEP) plans to provide more than 70 percent of its power from wind and solar resources as part of a cleaner energy portfolio that will reduce carbon emissions 80 percent by 2035.
TEP has filed its integrated resource plan (IRP) with the Arizona Corporation Commission, outlining plans for 2.5GW of new solar and wind over the next 15 years and 1.4GW of energy storage capacity as it progressively shutters its coal power stations.
See the TEP Press Release for more information: