In many countries today, much has been said about the use of renewable energy technologies – especially in light of rising oil prices. Renewable energy and energy generated from renewable energy sources – in other words, not “run out” or exhausted at the end. And can be continually re-created. And not only on oil prices, people are looking for clean and renewable energy. When these materials are burned, they release heat that produces steam, which in turn is used to generate electricity. Biomass to some other forms of useful energy such as methane gas or bio-diesel. Hydropower Hydropower is one of the oldest forms of renewable energy. It was used in ancient times for grinding grain. And coal was once the only source of energy in the United States. Geothermal energy, geothermal energy comes from the earth itself. Can be used to steam or heat resulting from the center of the earth to regulate the temperature of buildings, and can be used to generate electricity. Fans used to the wind kinetic energy of wind turbines, which in turn is used to generate electricity into the collection. And solar energy and this form of renewable energy be available until the sun shines. It can use solar energy and thermal energy, or can be converted into electricity. Can be used if the thermal energy for water heating. Use of solar cells or similar cells, can be used to generate electricity. It can also warmth of the sun can be used to steam turbines and the conversion and thus produce electricity.