Theoretically yes, though I guess the details are a little more complicated (depending on who exactly bought the energy and under what terms). e.g. energy compa

Theoretically yes, though I guess the details are a little more complicated (depending on who exactly bought the energy and under what terms). e.g. energy company x might have bought all the capacity from wind farm y for the next 10 years, so then the fact that it's producing excess energy at that point in time becomes x's problem rather than y's. Presumably x would factor stuff like this in to their purchasing decision, so as long as the average price remains above some level they will still make a profit.