The geothermal icon is represented with a building, but one part of the building will have higher top where smoke will come out of. The other part of the icon is there will be arrows coming from the bottom of the building or the ground and into the building.
Related to Geothermal Icon
Related icons are the icons with matching tags, as well as all industry icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors