Geothermal energy.
From radioactivity in the Earth's interior.
Geothermal Energythe term for deriving electricity from the heat of the earth is "Geothermal" (literally geo = earth and thermal = heat). Iceland gets a huge portion of its electricity from geothermal energy
The Earths internal heat.
Iceland, they are hot pool OS water,heated by magma under the earths crust, 80percent of homes are heated by geothermal energy from geysers and hot pools in iceland
The Earth system is powered by energy from two major sources: the Sun and the planet's internal heat.
Geothermal energy is used mainly in countries that lie along tectonic fault lines. Therefore, places such as New Zealand and above all Iceland rely on this form of energy. In fact, I'm sure that Iceland's electricity supply is almost fully based on geothermal energy.
Geothermal energy is being used extensively in NZ to produce power, Many countries in the world, especially Iceland and New Zealand are using geothermal energy.
Volcanoes
the sun- all the plants need it or photosynthesis and animals need it for oxygen.
All three are volcanic islands with thermal vents reaching all the way down to the mantle.
66% of the energy used by iceland is domestic geothermal energy.
Geothermal Energy