That is solar - wind can work through geographic distribution alone without so much as a potato battery. A local area may be becalmed by wind but since temperature differentials produce wind and the earth rotates into and out of the sun the only things which would lead to no wind render the power generation question a moot point.

Grid scale batteries make wind cheaper by allowing less overproduction but they do that for everything by assisting grid balance and acting as a form of high frequency trading which is productive in ways other than increased market liquidity.