Yeah, it's called net metering. Nothing new to the power industry, but I do believe that it was just approved by the government in the last few years (could be wrong though, it's been a while since I had anything to do with the power industry). You have to have a certain type of meter to do it, so that pretty much disqualifies quite a few people (apartments, etc), but it's a step in the right direction.
Lots of interesting ideas that I've seen though. Things like solar powered cars that you charge during the day, and once they're charged they feed excess power back into the grid.
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