DanielLC comments on Stupid Questions May 2015 - Less Wrong Discussion
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Cost. Wind/wave/solar energy is more expensive than fossil-fuel or nuclear energy to start with, and adding not-too-efficient storage mechanisms to even out the supply does not help it at all.
Really, the answer to most questions of this kind is "cost". It is the default and usually correct answer.
But "cost" isn't very specific. Is the major problem that it's too inefficient? That it takes too much to build? Too much to maintain?