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Well in Canada I've heard of some people (I think on the East Coast) that put up gaints wind-mills to generate electricity and since they aren't associated with the power company they get charged a yearly fee to pump power into the power grid. I think it was 500 dollars which I suppose would be okay if you were doing it on a large scale. But as just a regular person that would be a hefty amount.
As an aside to those that don't know what a geo-thermal furnace is. The idea is that at a certain distance underground the earth is a constant temp and by pumping water into the earth and back you can either take heat from the earth into your home or the other way around. It's environmentally friendy since it's a closed system that won't pollute (depends on power source I suppose). The system constantly circulates air through the home making the home a constant temperature not like a gas furnace in which the temperature goes up and down. It's supposedly 60% more efficient than a conventional furnace.
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