Despite the fact that potatoes are available to buy at any time of year, they are not grown year round. They are available no matter the season because of optimal storage techniques. There is a lot energy and effort spent in growing potatoes. All of this would be wasted if the potatoes spoil because they are not properly stored.
Therefore, storage is a serious matter: many advanced techniques are used to preserve the harvest. In storage sheds the temperature and humidity are constantly monitored and kept at the right levels. Often solar energy is used to automatically control this process along with natural refrigerants. By doing so, potatoes are well preserved and food waste is prevented!