The drawbacks of wind power from the power system point of view are its variability and unpredictability. However, these problems are greatly reduced when wind power is connected to larger power systems as these can take advantage of the natural diversity in variable sources. A large geographical spread of wind power will reduce variability, increase predictability and decrease the occasions with near zero or peak output. In this article, the situation in the Nordic countries (Denmark, Finland, Norway and Sweden) is described.