Actually, that isn't true. There are a few (experimental) power station that get their power from the temperature gradient of the earth crust - usually by making use of hot water. The inner earth isn't heated by the sun - it's hot because of gravity and tidal forces (and tidal forces are caused by gravity as well). And if you look deep enough, than sunlight is caused by gravity as well. So, everything is powered by gravity. ;-)
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