Renewable energy is energy which comes from nature such as sunlight, wind, hydropower, wave and geothermal renewable naturally. Nature provides a variety of energy sources in very large numbers because almost always there and ready to be processed into energy.
Solar cell technology is changing sunlight into electrical energy using photovoltaics. In general, how to use solar energy is divided into two active and passive. Usage is actively using technology photovoltaic panels or solar panels to collect electricity. While the use of a passive way is to set the direction of the building, using materials that absorb heat and building design that naturally facilitate air circulation within the building.
Wind power can also be used to generate electricity using wind turbines. Modern windmills average capacity between 600kW to 5MW. The exact location for this energy is a blustery area and constant as coastal areas or high altitudes.
Hydropower or water power can also be used to generate electricity using the water wheel which today is called the hydroelectric. If the electricity generated is not too large, the technology used is called microhydro, the maximum power of this method produces 100kW. Technology is damless hydro electric generating system that uses the kinetic energy from the flow of the river or ocean waves without using a dam. Ocean energy is energy from the sea or ocean. This includes marine current power, ocean thermal energy is tidal power.
Biomass (plant material) is a renewable source of energy or renewable energy because this energy comes from the sun. Through the process of photosintesa, plants capture the sun’s energy. In this case, biomass functions as a solar energy storage batteries.
Liquid biofuel or biofuel is divided into two bioalcohol (bio-ethanol) and biodiesel. Bioethanol is an alcohol obtained from the fermentation of sugars present in plants.
Geothermal energy is energy produced by taking geothermal. There are 3 kinds of power plants are used to obtain energy from geothermal energy, namely dry steam, flash, and binary. Dry steam plants take steam geothermal and directly used to drive the turbine which turns a generator producing electricity. Flash plants take hot water, usually a temperature of over 200 degrees C, and then boiling the ground on the way up to the surface and then separated between the hot water and steam flow to the turbine. For binary plants, the hot water flows through heat exchangers, boiling an organic fluid turbine rotate. Compressed steam and remaining geothermal fluid from all three of the above methods is injected back into the hot rock to produce more heat.
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