A lack
According to Bloomberg, "a lack of sufficiently windy days" caused losses in the wind "energy" business this quarter.
Hmm. I wonder if a nuclear plant ever suffers from "a lack of sufficiently fissiony days". I wonder if a coal plant loses money because of "a lack of sufficiently combustiony days".
Haven't heard those complaints because
Uranium will always produce heat by fission. Coal or natural gas will always produce heat by combustion. Those are natural processes you can count on.
You can't count on wind. It's like a cat. It rips your face off when you don't want it, and hides when you want it.