So, how do you get that energy back OUT? What you end up with is WARM water or concrete.
In order for the stored thermal energy to be usefull for anything but heating a house in the winter there has to be enough of it there to boil water into steam for driving turbines when the wind isn't blowing and the sun isn't shining.
A much more efficient way is using the excess energy to power a winch, which lifts a heavy weight up a tower/silo, so when the wind stops blowing and the sun stops shining, the weight slowly falls and drives a generator (think like a recoil starter on a small engine, just really long) to provide electrical power.
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Today's Featured Article - Talk of the Town: Can You Patch a Tire Sidewall? - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "Has anyone attempted (or succesfully) glued or bolted a patch to the tires' sidewall. I cannot afford a tire right now but have some horse stall mat material and could buy some glue. I could use some advice on
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