I had a short but interesting conversation with a friend of mine who works with a think tank for developing new sources of energy. They are experimenting with pumping water into deep fracked wells (8000 Feet he says.) The water is heated by the naturaly high temperatures at that depth. The water could be recovered at the other end of the fracked area and used to generate energy through steam turbines. I don't know how far along they are, but it might be something to consider when signing a lease. Hopefully, the gas present will last decades to come, but it is interesting to think that even the empty holes might be a useful source of energy in the distant future. If contained properly, geothermal is one of the cleanest forms of energy available and fairly simple techknowledgy. Let the enviromentalists mull that one over for a while.