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The last time an eclipse of this scale happened in Europe was in 1999. Back then, Germany got less than 1 percent of its power from solar energy. Today Germany is the world’s most solar-dependent country, drawing nearly 7 percent of its electricity from the sun. So when the passing moon blots out the sun, will the country’s lights go out, too?
So what’s the big deal, exactly? The sun goes down every night, of course, and Germany is quite accustomed to cloudy days. (It gets about as much sunshine as Alaska.) The difference with a solar eclipse is the speed at which sunlight will disappear from, and then return to, the power system. All electric grids operate on the fundamental principle that supply and demand must always be in perfect equilibrium, second by second. That dynamic becomes complicated when so much of your power comes from a source like solar, over which grid operators have zero control. And it’s especially tricky when the fluctuation is so rapid and extreme.
originally posted by: Eunuchorn
Clouds refract sunlight, eclipses don't.