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Solar (Photovoltaic) Electricity:
Photovoltaic cells convert sunlight directly into electricity. When
sunlight strikes a PV cell, electrons are dislodged, creating an
electrical current
Solar Water Heating:
Solar water heaters use the sun to heat either water or a
heat-transfer fluid in the collector. Heated water is then held in the
storage tank ready for use, with a conventional system providing
additional heating as necessary. 
Passive Solar Design:
A "passive" solar house provides
cooling and heating to keep the home comfortable without the use of
mechanical equipment. This style of construction results in homes that
respond to the environment.
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