Sunlight is earth's most ubiquitous form of energy. It is clean, inexhaustible, and the United States boasts one of the largest solar resources of any industrialized country. In the last decade, both distributed generation (small-scale installations located close to where the energy is ultimately used)...
Geothermal energy is thermal energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter. The geothermal energy...
A biofuel is a fuel that contains energy from geologically recent carbon fixation, such as plants. These fuels are produced from living organisms. Examples of...
Biomass is biological material derived from living, or recently living organisms. It most often refers to plants or plant-based materials which are specifically called lignocellulosic...
Solar energy is radiant light and heat from the sun harnessed using a range of ever-evolving technologies such as solar heating, solar photovoltaics, solar thermal...
Hydropower or water power is power derived from the energy of falling water and running water, which may be harnessed for useful purposes. Since ancient...
Renewable energy is generally defined as energy that comes from resources which are naturally replenished on a human timescale such as sunlight, wind, rain, tides,...