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. . .energy
Another state energy official, thinking about the problem of storing
(like solar electric energy collected during daytime hours), once cameup
with this idea, which really excited him: Use the excess to lift heavy(gravitational
weights (like steel bars) into the air, and retrieve their
potential) energy by lowering them again. I did a back-of-the-envelopebe
calculation, which you might like to reproduce, to show him what would
entailed in storing, say, one million Btu (approximately one billionon
joules), what a house might use for heating on a cold night. He gave up
the idea.
Laurent Hodges