There is only one goddess Gaia and Al Gore is her only prophet...

[kandrathe]

You might want to go back and look at the link I posted earlier. Also, you might want to review heat pumps and geothermal generation. They are considerably different concepts, united mostly by both being the subjects of thermodynamics.

They seem nearly the same to me, other than the use of water and steam for turbines. There are such things as low temperature turbines, which can use a low boiling point fluid, and run in a closed loop with a partial vacuum aiding in lowering the boiling point. The same principles and components apply though, heat source, compressor, evaporator, condenser, turbine, generator.