You could do that with a perfectly efficient battery. Trouble is, there are numerous forms of generation, and you could do arbitrage between them, but there are only a few forms of storage, all of them lossy. Transport loses as well, so you'd need to move your storage next to the generation. Develop an efficient battery and you won't care about this because to paraphrase the guy in Shallow Hal you'll be wiping your ass with $100s.
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