1.   Geothermal energy is of great interest in certain locations where hydrothermal steam is vented into the atmosphere.

2.   Geothermal energy is, basically, far too rare and too low-grade for widespread economic use.

3.   However, far more use is made of geothermal energy for direct heat.

4.   The hot rocks technique holds out the best hope for exploitation of geothermal energy.

5.   There are basically three methods of recovering geothermal energy.

6.   There is some promise of geothermal energy.

7.   They include biomass, geothermal energy, hydroelectric power, solar energy, tidal energy.