Power can be produced from the geothermal energy in hot rocks. This is being trialled in South Australia.

Hot Dry Rock Geothermal Power Station
Hot Dry Rock Geothermal Power Station

How It Works

How Hot Dry Rock Geothermal Power Generation Works
How Hot Dry Rock Geothermal Power Generation Works 

Geodynamics believes that its hot fractured rock project in South Australia has the potential to produce almost twice the energy of all of the oil reserves of the United States. It could produce enough energy to supply all of Australia’s power needs for 70 years with no greenhouse gas emissions and at about the same price as coal-fired power.