One of the Women's Studies actors took us to her parents' place right outside Gaithersburg that was off the grid. They had HUGE solar panels that powered everything. No gas, but plenty of well water. It all seemed pretty pricey, though you make up some savings in the fact that you're not paying for utilities. Lots of upkeep though. Cleaning a septic tank doesn't seem like a picnic.
Mrs. RC's parents have 33 acres in WV that we'll ultimately inherit. Other than electric, it's pretty much already off the grid. Of course there'll be a huge learning curve with me having to deal with gas lines, and well digging.
Still, it'll be worth it.