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Renewables are a solved problem, but storage of energy to combat the unreliability of renewables isn't.

NPP's take about 7 years to build. The latest EPR builds are taking more due to an over complicated design.

Storage is not, in fact, a problem. Numerous methods using century-old tech are cheap and practical, and only need to be built out.

They are not being built out yet because there is not excess renewable generating capacity to charge them from.