The most common type of home solar is generally used for back-up power or just an extra power boost. In the case of the latter, you can actually provide the electrical companies with a surplus. Some power companies will actually pay you for generating a surplus, ie. generating more power than you use.
There are generally two types of solar: photovoltaic and thermal. Photovolatic makes electricity directly from the sun, while thermal makes electricity by using the absorbed heat to make steam to turn a turbine. Photovoltaics are by far the most common.
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