Wind farm is a group of interconnected wind turbines in the same location which are used to produce electricity. Wind farms may vary in size and the really large wind farms can have several hundred interconnected wind turbines and can cover an area larger than hundreds of square miles.
Size is not the only categorization when discussing wind farms, another important category is also the location of wind farm, and given this categorization wind farms can be divided as onshore and offshore wind farms.
The largest wind farm in land is located in Texas, United States, the famous Roscoe Wind Farm. This gigantic wind farm has a capacity of 781.5 MW coming from 627 individual wind turbines, and provides enough power for more than 250,000 Texan homes.
The largest offshore wind farm in the world is located in United Kingdom, the Thanet Offshore Wind Project, with a capacity of 300 MW.
Offshore wind farms have higher construction costs compared to wind farms on lands because these projects need to be built very powerfully in order to withstand extreme weather conditions. However, offshore wind farms enjoy more powerful and more frequent winds compared to wind farms on land and are also barely visible from land so they do not interfere with the landscape's visual appearance.
The world's first wind farm was consisting of only 20 small (30 kW) wind turbines and was installed in southern New Hampshire, United States back in 1980.