The first example of producing geothermal electric power occurred at a plant in Italy in the first decade of the 20th Century; additional plants were then built in Japan and in California. Today, geothermal electric power is generated by plants operating in over 20 countries.
Countries along what’s known as the “Ring of Fire” that circles the earth have the best ability to harness geothermal energy for electricity production because they lie atop tectonic plate boundaries. That is why countries like the Philippines, Indonesia and the United States are leading producers of geothermal electric power based on their installed megawatt (MW) capacities. And in a country like Iceland, which is a volcanic island, geothermal electric power provides most of the electricity and hot water used by Icelanders
It is estimated that the amount of heat within 33,000 feet of the earth’s surface contains 50,000 times more energy than all of the oil and natural gas resources in the world.