Renewable Energy Explained
Solar, wind, hydroelectric, biomass, and geothermal power can provide energy without the planet-warming effects of fossil fuels.
Nonrenewable Energy
Nonrenewable energy comes from sources that will run out or will not be replenished in our lifetimes—or even in many, many lifetimes. Most nonrenewable energy sources are fossil fuels: coal, petroleum,
Nonrenewable Resources
Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we
Renewable Energy
Renewable energy comes from sources that will not be used up in our lifetimes, such as the sun and wind.
Renewable energy
SummaryOverviewMainstream technologiesEmerging technologiesComparison of the theoretical and practical potentials of different renewable energy technologiesMarket and industry trendsPolicyFinance
Renewable energy (also called green energy) is energy made from renewable natural resources that are replenished on a human timescale. The most widely used renewable energy types are solar energy, wind power, and hydropower. Bioenergy and geothermal power are also significant in some countries. Renewable energy installations can be large or small and are suited for both urban and rural areas. Renewable energy is oft
Renewable Resources
Renewable resources include biomass energy (such as ethanol), hydropower, geothermal power, wind energy, and solar energy. Biomass refers to organic material from plants or animals. This includes
Biomass Energy
Biomass energy—energy from living things—fuels electric generators and other machinery, but it comes with some environmental concerns.
Solar Energy
Solar energy is a renewable resource, and many technologies can harvest it directly for use in homes, businesses, schools, and hospitals. Some solar energy technologies include
tidal energy
Tidal energy is power produced by the surge of ocean waters during the rise and fall of tides. Tidal energy is a renewable source of energy.
Geothermal Energy
Geothermal energy is heat that is generated within Earth. It is a renewable resource that can be harvested for human use.
Hydroelectric Energy: The Power of Running Water
Hydroelectric Energy and the Environment Hydroelectricity relies on water, which is a clean, renewable energy source. A renewable source of energy is one that will not run out. Renewable energy comes