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A photovoltaic (PV) module is a packaged, connect assembly of typically 6x10 photovoltaic solar cells. Photovoltaic modules constitute the photovoltaic array of a photovoltaic system that generates and supplies solar electricity  in commercial and residential applications.

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Wind turbine design is the process of defining the form and specifications of a wind turbine to extract energy from the wind. A wind turbine installation consists of the necessary systems needed to capture the wind's energy, point the turbine into the wind, convert mechanical rotation  into electrical power, and other systems to start, stop, and control the turbine.

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http://www.energysavingtrust.org.uk/renewable-energy/electricity/hydro
a good web site that can give you a lot of information.

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biomass is a renewable energy source

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Renewable energy heat

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Greywater harvesting (also called graywater, and greywater), is differentiated from other harvested water sources like rainwater or condensate in that it has already been “gently used”– usually as water from showers and sinks, but it could also be sourced from ponds, pool backwash or process rinse water.

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Liam