The McMicken Energy Storage Facility that APS operated in Surprise was the scene of a catastrophic battery explosion in 2019. Courtesy APS The Surprise City Council will continue its discussions about setbacks for battery energy storage systems from existing homes later this summer after not being able to settle on a number this week. The council on June 16 debated a setback of 100 feet versus 1,500 feet, a drastic difference, with council members divided on what to do.