I see where the geothermal heat pump qualifies but what about these geothermal generators I hear about do they qualify too? Where do I get one for my house?

The geothermal generators I have read about are huge things that need deep wella. Not the sort of thing for a homeowner. I found one reference for a "small" genereator that could be used to power a small island or an isolated area.

I can't find anything in the tax bill for geothermal generators.