http://www.energy-green.net/blog/articles/geothermal-power/pros-and-cons-of-geothermal-technology.html
Electricity generated from geothermal energy (geothermal power) offers a number of advantages:
1. Reliability
2. Renewability
3. Combustion-free
4. Very low emissions
5. Reduction in global warming
6. Domestic economic boon
7. Minimal land impact
8. Water conservation
9. Flexible plant growth
However, there are some disadvantages to the production of electricity from geothermal energy sources:
1. Limited geographic site locations
2. High start-up cost
3. Land subsidence may occur
4. Poor management can exhaust sites
Tax incentives, subsidies and government policy will play a large role in the speed to develop and implement geothermal energy technology.
Geothermal energy provides large amount of electricity with little effect on the environment. But it is limited by geographic sites and high start-up costs. It is very sustainable since the thermal energy from Earth will always be there until the planet is gone, but the location choices makes mass production of plants impossible. Geothermal power plants are characterized by high capital investment for exploration, drilling wells, and plant installation, but low cost for operation and maintenance.(http://geo-energy.org/geo_basics_plant_cost.aspx#cost)
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