Renewable energy is the energy which comes from natural resources such as sunlight, wind, rain and geothermal heat, which are renewable. About 16% of global final energy consumptioncomes from renewables, with 10% coming from traditional biomass, which is mainly used for heating, and 3.4% from hydroelectricity. New renewables types of energy as small hydro, modern biomass, wind,solar, geothermal, and biofuels accounted for another 2.8% and are growing very rapidly. The share of renewables in electricity generation is around 19%, with 16% of global electricity coming fromhydroelectricity and 3% from new renewables.
Airflows can be used to run wind turbines. Modern wind turbines range from around 600 kW to 5 MW of rated power, the power output of aturbine is a function of the cube of the wind speed, so as wind speed increases, power output increases dramatically. Globally, the long-term technical potential of wind energy is believed to be five timestotal current global energy production, or 40 times current electricity demand. This could require wind turbines to be installed over large areas, particularly in areas of higher wind resources.Hydropower
Energy in water can be harnessed and used. Since water is about 800 times denser than air, even a slow flowing stream of water, or moderate sea swell, can yield considerable amounts ofenergy. The Run-of-the-river hydroelectricity systems derive kinetic energy from rivers and oceans without using a dam.
Solar energy is the energy derived from the sun through the form ofsolar radiation. Solar powered electrical generation relies on photovoltaics and heat engines. A partial list of other solar applications includes space heating and cooling through solar architecture,day lighting, solar hot water, solar cooking, and high temperature process heat for industrial purposes.
Solar technologies are broadly characterized as either passive solar or active solar depending...