wind power capacity has expanded quickly to 743 gw in 2020, and wind energy production was about 5% of total worldwide electricity usage, and growing fast. wind power is widely used in european countries, and more recently in the united states and asia. wind power accounts for approximately 19% of electricity generation in denmark, 11% in spain and portugal, and 9% in the republic of ireland. these are some of the largest wind farms in the world, as of january 2010: