Germany has about as much sun as Washington state -- that is to say the least sunny place in the lower 49 states. It is also not particularly windy in Germany, either.
If Germany can get ~12-15% of their electricity from renewables (they also use methane biogas from digested corn stalks and leaves), and get that up to 20-40% in a couple of decades, then the USA certainly can do at least this much; in a few decades.
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