This photo taken in 2017 and provided by Arizona Public Service shows the Festival Ranch 2 megawatt battery owned by Arizona Public Service near Buckeye, Arizona. An identical battery caught fire in April 2019 in a massive blaze that sent eight firefighters and a police officer to the hospital, highlighting the challenges and risks that can arise as utilities prepare for the exponential growth expected for massive batteries to store energy. (Arizona Public Service via AP)

This photo taken in 2017 and provided by Arizona Public Service shows the Festival Ranch 2 megawatt battery owned by Arizona Public Service near Buckeye, Arizona. An identical battery caught fire in April 2019 in a massive blaze that sent eight firefighters and a police officer to the hospital, highlighting the challenges and risks that can arise as utilities prepare for the exponential growth expected for massive batteries to store energy. (Arizona Public Service via AP)

Arizona fire highlights challenges for energy storage

Fire, explosion at a battery west of Phoenix sent eight firefighters, police officer to the hospital.

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