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How does solar power works?

I have come to this forum regarding my query pertaining to solar power. I know a thing or two about the grid collecting power and transferring it. But I don’t know about the whole specifications. I am trying to figure out why grid size needs to be so big and solid. Can somebody explain how does solar power works? Or tell me about the names of the websites where I can find the information related to my query? I would really appreciate your relevant information regarding this. Thanks.