Elon Musk, the owner of the electric cars manufacturer Tesla Motors, has announced Tesla Energy, a suite of batteries to power homes as well as businesses. The first products that will be available in the USA this summer are Tesla Powerwall, a lithium ion battery in 7 kWh and 10 kWh models, and Powerpack, a 100 kWh unit for higher demands. The idea is to revolutionize the management of electricity by helping to achieve autonomy from suppliers.