Green power
Green power means both solar power and windmill for the generation of electricity from sunlight using photovoltaics (PV), or indirectly with concentrating solar power (CSP), where the sun's energy is focused to boil water which is used to provide power. In Bangladesh, the air is rich in water vapour. Sunlight and water vapour for CSP to produce electricity are available and it may be more efficient for solar power. Solar power had the potential to provide over 1,000 times total world energy consumption in 2008, though it provided only 0.02% . The largest solar power plant in the world is the solar thermal plants producing 354 MW but recently multi-megawatt photovoltaic plants have been built. The 46 MW Moura photovoltaic power station in Portugal and the 40 MW Waldpolenz Solar Park in Germany are large photovoltaic power stations. Recently, scientists proposed much larger ones, such as the 100 MW Fort Peck Solar Farm, the 550 MW Topaz Solar Farm, and the 600 MW Rancho Cielo Solar Farm.
Solar energy is not available at night, making energy storage an important issue in order to ensure continuous availability of energy. Both wind power and solar power are intermittent energy sources, meaning that all available output must be taken when it is available and either stored for when it can be used, or transported, over transmission lines to where it can be used. Wind power and solar power can be complementary, in locations that experience more wind in the winter and more sun in the summer, but on days with no sun and no wind the difference needs to be made up in some manner.
Therefore, solar power plants can face high installation costs, but its technology is very simple, compared to other sources of energy.
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