This idea are different than storing each electron like a capacitor or battery which perhaps store each electron in a solid perhaps conductive material. The idea is about storing each electron inside of a container like perhaps how can fill a container with a gas like air. Should read the post so can perhaps understand.
Also mentioned idea with storing light in a container like with maybe being able to more effectively store lower spectrum of light like radio wave spectrum of light than with higher spectrum of light maybe like microwave and visible light.
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