There is also the challenge inherent in wind-generated electricity: ensuring that the city can continue to run when the wind is not blowing. To address this problem, Copenhagen has had to devise an electricity-generation strategy that enables it sometimes to run on coal-fired power when necessary, without creating net emissions.
此外还要解决风力发电的固有难题：保证城市在不刮风的时候也能正常运转。丹麦为此制定了发电战略，在必要时启动燃煤发电，而不计入净排放量。