I called our power company (Novec) and asked whether they will buy excess power that I pump back into the grid. The lady on the phone gave an immediate and definite "No." Maybe I didn't ask the right question. I will look into it some more.

The links posted by crash9 look great. I definitely will follow up with those. That little Petter motor is just too cool for school. I need one of those.

I don't know whether my place qualifies as windy, but we do have an old dairy barn that sits on a high spot. I've been thinking that a wind generator would look good on top of the barn in place of one of the old sheet metal ventilators. We've always got a breeze going up there.