The most powerful wind turbine of Siemens has an output of 3.6 megawatts (MW), which is 1.3 MW more than the model that previously held that title, and a hundred times greater than the output of the first wind turbines 25 years ago. It is the world´s most powerful series machine for sea based wind farms. With Burbo, located in the approach to Liverpool Bay, Siemens installed the first offshore wind farm with 3.6 MW turbines and a total capacity of 90 MW in only one and a half months. Since 2007, the Burbo Wind Farm supplies over 80,000 households. In 2007, Siemens set up enough wind power stations to produce four billion kilowatt-hours per year, which is about 12 percent of the electricity consumption of Denmark. Today Siemens is the leader worldwide in the offshore business.