Best known for its electric cars, Tesla Motors has announced Tesla Energy, a new venture to provide battery storage for homes and businesses, leveraging the new Gigafactory that Tesla is building in Nevada. The signs for such a deal have existed for quite some time, but now the company has made it official – confirming that it is in fact a battery company with a car problem, and not the other way around. Run by enigmatic CEO Elon Musk, Tesla’s luxury electric cars took the automotive and tech press by storm. Now the company has unveiled the Powerwall – a wall-mounted home battery “designed to store energy at a residential level for load shifting, backup power and self-consumption of solar…