That's a bad response when any comment could easily link to a relevant white paper. GP, MIT+INL had a nice report in 2006[1] covering a lot about that and the resource potential. The GeoVision[2] report and data from DOE is also a good and more recent project.

[1] https://energy.mit.edu/wp-content/uploads/2006/11/MITEI-The-...

[2] https://www.energy.gov/eere/geothermal/geovision