I think I may have found the most energy-efficient home in America. In this video, engineer Michael Strizki of Hopewell, N.J., reviews the three power systems on his home that have allowed his family to live "off the grid" completely. In addition to using energy-efficient construction, the home has a battery of solar cells that provide electricity. The solar energy also powers the hydrogen fuel cell technology, which is used for more electricity for the home and fuel for his car. As if that wasn't enough, the home has a geothermal power system for heating and cooling. When all else fails, Strizki can always flip on a switch to reconnect to the conventional electrical power grid, but what fun is that?