The Tesla Powerwall charges using solar power, but it also integrates with the grid “to harness excess power and give customers the flexibility to draw energy from their own reserve.” The batteries recharge in a ‘smart’ way, saving money by picking low-rate periods when electricity is cheapest. They store solar energy for later, for example overnight, and can act as a back-up in the event of a power outage.

Removing dirty energy is an ambitious plan — much like space travel — but Musk believes it can be done. He explained that 160 million battery packs could “transition” power usage in the U.S. to renewable energy, while 900 million units could shift the entire world’s energy needs. Then there is the potential to make the world’s cars run on clean energy.

“This is within the power of humanity to do,” Musk said. “It is not impossible, it is something that we can do. But there’s going to be other companies involved.”

Contrary to most companies these days, Tesla’s press conference — which ran entirely on solar energy — was direct and to the point with little hyperbole.

Musk has made electric cars a reality, and is pioneering space exploration with SpaceX. Tesla Energy is another concept which, though beyond the realm of most people’s understanding, has potentially huge consequences if Tesla can execute as Musk believes it can.

Excerpts from: TechCrunch