My parents had one and I was the "service guy" on it back during the last energy crunch. Somewhere in the 80's I think. It was a Jacobs 10KW model. We had the # 18 of the first 40 units they built when they restarted operations. After the first 40 they redesigned the top section. Of course we ended up being a guinea pig for any modifications that they thought would improve it.
We had the blades hit the tower (100 ft.) a couple of times, it got zapped by lightning a couple of times, lots of trial and error trying to get it to work properly.
Then they needed cash so Contol Data Corp came in, provided some financing, and then everything changed. They were more interested in selling machines for wind farms rather then helping the individual homeowners. Sad, Sad. It was really a good product when it worked. I checked and some other company bought them out. I was thinking of contacting myself. http://www.windturbine.net/home.htm
Basically the machine connected to the local power grid via a synchronous inverter hooked directly to a dedicated 220v breaker in the electrical box. You would use all of the power from the wind machine first and then supplement with utility power. Any excess initially would spin the meter backwards. But then they put a ratcheted meter on. Then we installed another meter to register what came in and what excess went back out. My parents were never paid for the excess.
However I'll mention that being on top of a hill doesn't necessarily mean good wind. Sometimes it is a very turbulent wind at the top of the mountain. It is best to have a nice long straight stretch of wind. Better production in that it is coming directly and the machine isn't turning constantly to be in the direct path of the wind flow.
What ever the rating on the wind generator is, use a factor of 10% of the max as a general rule of thumb for what you can expect here in PA.
The last lightning strike fried the generator on top of the tower. Even though I was a dealer I was not allowed by the insurance company to repair it myself. We shipped it off to a dealer in R.I. While there someone offered to buy it and they sold it.
Feel free to PM me if you want to discuss it further.
PS I still have my climbing belt and all safety gear in the barn. However I don't know if the knees will hold out to get to the top of the tower.