I taught my students that intermittent renewable electricity (wind and solar) was third class compared with dispatchable fossil fuels (first class) and baseload nuclear power (second class). But that renewables may be turned into a first class electricity source with the development of affordable grid-scale storage. There are two important qualifiers to this statement and those are 1) affordable and 2) grid-scale. By grid scale I mean electricity storage that could power a medium sized town for a day or longer, or every night when the sun is down.
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