Most of our energy comes from the sun but there is also an
enormous reservoir of energy in the form heat beneath the Earth.
Sometimes this heat rises to the surface in the form of hot
water or steam. In a few places, powerful jets of steam shoot up
from the ground as geysers. Geothermal steam and hot springs
have been used for more than a hundred years to generate
electricity. Geothermal power plant in New Zealand How It Works
Either, steam is used directly to drive a turbine, or the hot
water is used to evaporate another liquid with a lower boiling
point, and the vapour from the second liquid drives the turbine.
Hot Dry Rocks Everywhere in the world, rocks deep below the
surface are very hot. In some places, these hot rocks are closer
to the surface than elsewhere. One such place is central
Australia. It is possible to make electricity using the heat in
these rocks by pumping water down to them and capturing the seam
that is produced when the water is heated by the rocks. The hot
rock formations in central A