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GEOTHERMAL ENERGY: RENEWABLE ENERGY

Technologies in use include dry steam power plants, flash steam power plants and binary cycle power plants. Geothermal electricity generation is currently used in 24 countries while geothermal heating is in use in 70 countries.
Estimates of the electricity generating potential of geothermal energy vary from 35 to 2000 GW.[2] Current worldwide installed capacity is 10,715 megawatts (MW), with the largest capacity in the United States (3,086 MW), Philippines, and Indonesia.
Geothermal power is considered to be sustainable because the heat extraction is small compared with the Earth's heat content. The emission intensity of existing geothermal electric plants is on average 122 kg of CO2 per megawatt-hour (MW·h) of electricity, about one-eighth of a conventional coal-fired plant..continue..


Geothermal energy is thermal energy generated and stored in the Earth. Thermal energy is energy that determines the temperature of matter. Earth's geothermal energy originates from the original formation of the planet, from radioactive decay of minerals and from volcanic activity. The geothermal gradient, which is the difference in temperature between the core of the planet and its surface, drives a continuous conduction of thermal energy in the form of heat from the core to the surface...continue..

The word geothermal comes from the Greek words geo (earth) and therme (heat). So, geothermal energy is heat from within the Earth. We can recover this heat as steam or hot water and use it to heat buildings or generate electricity. Geothermal energy is a renewable energy source because the heat is continuously produced inside the Earth...continue..

Heat from the earth can be used as an energy source in many ways, from large and complex power stations to small and relatively simple pumping systems. This heat energy, known as geothermal energy, can be found almost anywhere—as far away as remote deep wells in Indonesia and as close as the dirt in our backyards. Many regions of the world are already tapping geothermal energy as an affordable and sustainable solution to reducing dependence on fossil fuels, and the global warming and public health risks that result from their use. For example...continue..

Most people believe that the history of geothermal energy is relatively short. This is a common misconception. While the full story of humankind's first harnessing of geothermal energy is truly lost in antiquity, it is clear that the history of geothermal energy goes back as far as that of our other alternative energy sources....continue..

Here we shall discuss a brief history of geothermal energy. Please note that the content of this article relates to the proper meaning of geothermal energy (heat produced by our earth), and not the heating of our earth by the sun (see "what is geothermal energy" for more information). Geothermal energy was quite a significant power of the past and may go back a lot longer than you think..continue..

When exploring for geothermal energy, it is important to consider the following:
What is geothermal energy?
What are the components?
What are the forms of geothermal energy?
How are geothermal resources used?
What geophysical surveys are applicable?
Why is it important to survey before drilling?
What are the stages in geothermal exploration?
What are the objectives of geothermal surveys?..continue..


Whilst many people think that geothermal is only good for home heating and cooling, there are in fact many geothermal energy uses. This is sometimes incorrectly labelled as different "types of geothermal energy." This is only one such thing - namely the heat available below the surface of the earth. The uses for geothermal energy though are far-reaching, and this alternative method of energy production could be one of the most significant within the next couple of decades..continue..
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