The future of Geothermal and Earth Coupling devices

What is the future of Geothermal and Earth Coupling devices? Are thesetechnologies viable and if so how do they work? Are they cost effective and are theysustainable? ( These questions would cover electrical power generation and heating andcooling capabilities.)...

The future of Geothermal and Earth Coupling devices

What is the future of Geothermal and Earth Coupling devices? Are thesetechnologies viable and if so how do they work? Are they cost effective and are they sustainable? ( These questions would cover electrical power generation and heating and cooling capabilities.)...