Take a look at this short keynote from Tesla’s Elon Musk. Not only they are doing some amazing stuff with their cars, but they are building a better tomorrow.
The Tesla Powerwall is a battery that stores solar energy. It costs about $3500 (the price does not include solar panels, installation and circuitry).
The best thing is that you can actually own one of these and power your home with it. It covers all the basic needs for a regular house.
I happen to love what Tesla and Elon Musk are doing, from the cars and space shuttles. I’ve said this before: Apple should buy them or, at least, invest in their products and ideas.