Orsted A/S unveiled the world’s largest offshore wind farm, an 87-turbine complex in the Irish Sea covering an area more than double the size of Manhattan.

The Walney Extension off the coast of northwest England has a generating capacity of 659 megawatts and is capable of powering 590,000 homes, according to Danish company Orsted, the world’s biggest developer of offshore wind farms.

MHI Vestas Offshore Wind A/S and Siemens Gamesa Renewable Energy SA provided the turbines for the project that began construction in August 2015. The Vestas 8-megawatt turbines stand 195 meters tall while the 7-megawatt version by Siemens is 154 meters from sea level to blade tip.

Largest Offshore Global Wind Farms by Capacity

Source: Renewables U.K.

At 145 square kilometers, Walney overtakes another U.K. offshore wind farm, London Array, as the world’s largest. It uses less than half the number of turbines over a larger area to generate more power.

Orsted sold 50 percent of Walney to a group of Danish pension funds in November 2017. The U.K. currently operates 1,837 offshore wind turbines with an operational capacity of 7.1 gigawatts, according to trade association Renewable U.K.