The BIGGEST problem with clean energy

Just asking for your opinion on a different concept of my own that is quite basic. The build can at least be of 2 ultra strong permanent magnets, one above another where the top magnet stays stationary on a plastic* container maybe filled with water while the other is inside that container. Between the top magnet and the container needs to be a very narrow gap for which a light sheet of lead* can easily slide between the magnets just enough to cause the bottom magnet to fall as if it were a delicate power switch that the rise and fall will help* generate more electrical power than it would take to move the lead* sheet in and out of that gap in least frictionless way, maybe levitated by other magnets. The water is basic to prevent damaging and even far too much noise.
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In summary... it would be as if the permanent magnets can be switch on and off like electro-magnets.
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I tend to come up with a whole lot of various ideas that worked out awesomely, but... not often able to test my ideas out.