Surprise, Ariz., is a city in Maricopa County just outside Phoenix, population around 143,000, and is the spring training location for both the Kansas City Royals and the Texas Rangers. Along with 24 other valley cities, the Surprise Fire Department is dispatched through the Phoenix Regional Automatic Aid Dispatch System, allowing the closest units to respond regardless of their jurisdiction.

The Arizona Public Service McMicken Battery Energy Storage System (ESS) was a 2 MWh (megawatt/hour) lithium ion battery…