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In response to "I was thinking that as it lowers a large block it could simultaneously lift a smaller block. " by Volnelk

No, you'd be blowing the whole point.

you use generated electrical energy to lift the blocks. They then have potential energy because of gravity. When you lower the block it releases that in the form of powering a turbine to turn it back into electricity again. You lose energy in every step because of inefficiencies, but it's better than not generating the electricity in the first place. There's no point in raising a block at the same time you're lowering one, they're at complete cross purposes.

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