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I'm pretty sure we still plan to have lights in our renewable energy utopia.

We don't need them as indiscriminately and wastefully as we currently have them.

When solar is providing us electricity at 2 cents / KWH, we will use them even more indiscriminately.

and in this far-from-reality-now story, im sure many things will be different.

Well, for lighting the battery costs are more relevant.

But nowadays you don't even need to wire electricity to the place you want to floodlight, so yes, we will only use them more.

We dont need a lot things. Lack of "need" has never stopped humans. Switching to renewable energy certainly won't change that.