​​​Behind-the-meter energy storage is widely viewed as a growth industry, with one report listing more than 40 companies that are active in this area. In October 2016 Tesla and SolarCity announced a new “solar roofing” product along with new versions of the PowerWall residential battery and the PowerPack commercial / utility-scale batteries. This advisory focuses on the new batteries. The solar roofing tiles will be addressed in a future advisory when more information is available.