In New Zealand, look up the company WhisperGen. They are producing a stirling engine that generates electricity. The problem is that it is heated with natural gas. Their product isn't compatable with 110 electric service, but their site says they plan to market such a device to America in late 2010. My belief is, whether one is fortunate or not to live close to hot springs as you do, that home geothermal, with the compressor that magnifies such heat, would do the trick for everybody everywhere. Imagine - heating and cooling your home and generating electricity from that same source, would make home energy production pollution-free and, when your electricity is sold back to the electrical grid, profitable! Free energy! Not a dream, a reality in our future. Let's just keep our government from putting their sticky fingers in our liberty!