Photvoltaics Advanced Solar PV systems can convert roughly a 1/3 of the power of the sunlight they receive into electricity. A 5-kilowatt, ideally-designed home solar system can be expected to generate approximately 6,560 kilowatt hours per year, or about three-quarters of the average Connecticut household consumption of 8,400 kilowatt hours per year.

Solar Thermal A technology for harnessing solar energy for heat. This is very different from solar photovoltaics, which convert solar energy directly into electricity. Solar thermal collectors are characterized as low, medium, or high temperature collectors. These systems are designed for general residential and commercial use, heating swimming pools and commercial power production.

Wind A proven clean, renewable energy technology that can now compete with other traditional forms of power generation. According to the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy, the cost of energy from wind has dropped approximately 85 % in the last 20 years.

Geothermal A heating and/or air-conditioning system that uses the earth's ability to store heat in the ground and in water thermal masses. This system will take advantage of a land mass as a heat exchanger to either heat or cool a building structure.

These systems operate on a very simple principle: the ground a few feet below surface stays around annual average temperature throughout the year, typically somewhere in range of 50-85 °F (10-30 °C) depending upon a location's annual climate. Cooling or heating this air requires substantially less energy.
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Co-generation- Combined heat & power (CHP) Cogeneration is a thermodynamically efficient use of fuel. A “heat engine” or a “power station” simultaneously generates both electricity and useful heat for a commercial or residential building. CHP captures the by-product energy from a boiler or other source which is wasted by traditional systems.

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