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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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