The problem with wind is it's uneven distribution across hours and days.

Because wind usually often weak and below rated speed, you need to build extra capacity to get enough electricity in normal days. When there is enough capacity, the price goes to zero or negative during days when windmills work close to rated speed, then increases dramatically when there is no wind. If wind power generates profits only when there is wind but not enough to saturate the demand, profitability suffers. Energy storage increases the price and is unsolved in large scale. Bigger smarter grids over large areas and solar compensate to some degree.