Then it'd be good to mention what this storage mechanism is, and examples of existing commercial deployments said storage mechanism and their cost history. It's odd to see someone insist that the solution is so obvious that anyone who doesn't recognize it is trolling, yet they neglect to mention what that solution is.

Storage is a common answer, but it has problems of its own. Presumably the OP considers these problems fatal; if you disagree, say so and explain why.

OP could explain why they imagine fatal problems. Would, if they were not just trolling.