Water out of the ground to heat furnaces in the winter and cool in the summer. Very interesting product. Will probably mark time at the moment. In the bottom 2/3rds of his database.
Geothermal play. Was very attractive when gas prices were $12-$13. The shine came off when gas prices dropped. Thinks gas will go significantly higher so geothermal is the way to go. Very attractive dividend.
Geothermal heating for homes. There is a high installation cost but is virtually cost free to run. Revenues have been rising significantly, but got hit by a US housing scare. Probably a takeout candidate.
WFI Industries is involved with geothermal heating and cooling for residential and commercial application. It is managed well and has a 30% ROE. It is a good long term investment.
Geothermal heating and cooling by laying pipes underground for houses. Downside is the initial expense of $5,000 to $10,000 but the savings are large. A very small cap so tread carefully. Just about the only totally genuine anti-energy company. People for earnings and revenue progress.