Turns out, quite obviously in hind sight, that wind power is also highly dependent on the density of the air. Air density changes with the weather, temperature, etc. Most wind turbines offer their power generation numbers assuming constant air density. It turns out, that it's not, and when you account for it, you get their output much more clearly.
Sadly, this is another knock for wind power as the variability only goes up. If we can get significant cheap electrical energy storage, then the problem goes away.
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