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It depends what you mean by free energy. The term Free Energy is used in thermodynamics and generally refers to the amount of energy in a system which is available for work. It is a theoretical quantity and not one you'd use when discussing powering devices. If you mean energy available for free, like the sun's light, then in theory you can power anything you can hook up to your source. However, bear in mind that nothing really comes for free. If you want to use the sun's light you have to buy a solar panel, or if you want to use wind power you need a wind turbine, and as well as purchasing you have maintenance and depreciation.

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