  
Photovoltaics is the field of technology and research related to the application of solar cells for energy by converting sunlight directly into electricity. Due to the growing demand for clean sources of energy, the manufacture of solar cells and photovoltaic arrays has expanded dramatically in recent years.
 Photovoltaic production has been doubling every two years, increasing by an average of 48 percent each year since 2002, making it the world’s fastest-growing energy technology. At the end of 2007, according to preliminary data, cumulative global production was 12,400 megawatts. Roughly 90% of this generating capacity consists of grid-tied electrical systems. Such installations may be ground-mounted (and sometimes integrated with farming and grazing) or built into the roof or walls of a building, known as Building Integrated Photovoltaic or BIPV for short.
Financial incentives, such as preferential feed-in tariffs for solar-generated electricity, and net metering, have supported or subsidized many solar PV installations country-wide.
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Alternative Energies
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 Geothermal Heating
A geothermal heat pump system is a heating and/or an air conditioning system
that uses the Earth's ability to store heat in the ground and water thermal
masses ...
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Small Wind Turbines
A wind turbine is a rotating machine, which converts the kinetic energy in wind
into mechanical energy. As an industry, wind power has experienced major growth ...
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