Tesla has some of the most advanced battery expertise in the world, and the announcement of the Powerwall takes that expertise beyond automobiles and into the home. The Powerwall is a big home battery that charges on solar energy. Two variants are being offered, $3000 for 7kwh or $3500 for 10kwh. Owning a Powerwall will enable consumers to store power they generate and use it later, cutting costs and reducing drain on the power grid when demand is highest. A solution that provides energy storage for a sustainable home.