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The heat source can be solar energy, warm water or waste heat.
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The law of conservation of energy means that solar heat which warms the earth has to go somewhere.
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Then there is one of the oldest ways of getting power out from the sun: solar "thermal" installations, which absorb the sun's energy, transforming it into heat so it can boil water and run a turbine.
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Similarly, solar thermal energy--which harnesses the heat of the sun to generate steam-powered turbines--consumes more than 2, 600 liters of water per megawatt hour, 200 liters more than coal-powered generation needs to produce the same energy.
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You are now driving(in effect) on free solar energy that you created by removing the need to heat water and using the natural gas to drive your car instead.
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For example, if you plan to add geothermal heat pumps, residential small wind turbines or solar energy systems, the credit is equal to 30% of the cost with no upper limit.
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As well as using wind turbines to provide electricity, and straw-burning plants to provide heating, some islanders have solar panels on their roofs and others warm their homes using geothermal energy and the heat given off by fresh cow's milk.
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At least the effect on your wallet will be the same as driving your car with solar energy in fact, most people use more energy to heat water than they do driving their car.
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