Because wind is intermittent and not reliable, wind turbines alone aren’t a consistent source of energy.  Because there can be days without wind, storage alone needs to cover short and long periods without the turbines producing energy.  But if solar is added, especially where it is windy at night as it is all summer in California’s windy areas, then reliability dramatically increases.  When it is raining and there isn’t much sun, it is often windy. The type and amount of storage will depend on an analysis of historic wind and solar data.