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Here in SoCal where we were over 1,000 miles from the full eclipse we still had a good drop in solar production by about 1/4 of what it would be during the same time.
I drove a couple of hours in the Y to where it was a full ring of fire, and it was very cool to see. Definitely lower light intensity, my SO described it as the kind of light you'd see in the greenish cast in the shadows of a thunderstorm. No scientific data from me, but yes a very definite hit on solar production for a hour or two time range is very plausible to me!