Tesla’s New Powerwall Batteries: 7 Or 10 kWh For $3,000 Or $3,500

Last night, as promised, Tesla unveiled the new, non-automotive product line it had previously teased–confirming that the carmaker will enter the energy-storage business. Under the Tesla Energy brand, the electric-car manufacturer will also sell lithium-ion batteries for utilities, businesses, and houses. The batteries can store electricity… …read more