1. 3-4. geothermal energy 3-4-1. Generals
Thermal (heat) energy from the crust (underground or Earth)
One of the renewable energies (others include wind, solar, tidal, etc)
Cost effective, reliable, sustainable, and environmentally friendly
Mostly used for electricity generation

2. The Nesjavellir Geothermal Power Plant in Þingvellir, Iceland

4. Soureces
Heat from the original formation energy (20%)
Radioactive decay (80%)

5. % of national electricity prod. % of global geothermal prod.
World Production (of geothermal electricity) Total of 10,959.7 MW in 2010
Country
Capacity (MW) 2007
Capacity (MW) 2010
% of national electricity prod.
% of global geothermal prod.
United States
2687
3086
0.3 29
Philippines
1969.7
1904 27 18
Indonesia
992
1197
3.7 11
Mexico
953
958 3 9
Italy
810.5
843
1.5 8
New Zealand
471.6
628 10 6
Iceland
421.2
575 30 5
Japan
535.2
536
0.1
Iran
250
El Salvador
204.2
204 25

6. http://www. smartplanet

7. 3-4-4. Environmental Effects
Reduces greenhouse gases
May release a small amount of green house gases & other toxic elements (CO2, H2S, CH4, NH3, Hg, As, B, Sb)
Can affect the land stability (typically subsidence) and ecosystem near surface