Storing wind power for a calm day

Wind power is available when it's windy, right? While many claim that's a detriment for wind power, what it really points to is the need for affordable methods to store energy. Affordable energy storage also affects the need for peaker plants, because the energy could be generated at night, stored, and released during the day. Affordable energy storage works with wind power to store energy when it's windy, for release on days it's calm.