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Stored energy.... in the form of heat stored in molten salts, or in batteries, or weight differential, or submerged, compressed gasses, or hydrogen created by electrolysis, or many other ways. Created energy.... in the form of geothermal, or tidal flows, wave action, or the reclaimed energy that is extending the mpg of the hybrid cars, perhaps soon, fuel cells, or even the less green forms that dominate the current scene.