Renewable Energy International is the website (blogged it earlier) of the NJ engineer who is completely off the grid and carbon-neutral by using solar electricity to split water into hydrogen and oxygen.
The hydrogen gets stored in 1,000-gallon tanks until winter when the solar power drops off. He then uses the stored hydrogen to power fuel cells that produce electrical energy, heat, and water.
The water goes back into the cycle.
What isn't mentioned in the video is that he also uses the hydrogen to power his car.
Check out the video.
REI Founder speaking about Renewable Hydrogen technology - video courtesy of New Jersey Network