There's a few things that help with periods of low wind: More long distance transmission / interconnects Vehicle-to-grid Grid scale battery storage

There's a few things that help with periods of low wind: More long distance transmission / interconnects Vehicle-to-grid Grid scale battery storage Domestic and commercial battery storage (Powerwall etc) Seasonal thermal storage - large insulated tanks or ground source heat pumps These all exist, and there will be more new technology coming. It doesn't seem like an unsolvable problem.