Since late 2000, the world’s largest offshore wind farm to date has stood in the strait of øresund, which separates Denmark from Sweden, 1.3 miles (2 km) west of the port of Copenhagen, at a depth of 10 to 16 feet (3 to 5 m). Its 20 turbines, each equipped with a rotor 250 feet (76 m) in diameter, standing 210 feet (64 m) above the water, form an arc with a length of 2.1 miles (3.4 km). With a power of 40 MW, the farm produces 89 million kWh per year (about 3 percent of the electricity consumption of Copenhagen). In 2030, Denmark plans to satisfy 50 percent of its electricity needs by means of wind energy (10 percent today). Although renewable forms of energy still only make up 2 percent of the primary energy used worldwide, their ecological advantages are attracting great interest. Thanks to technical progress, which has considerably reduced the noise disturbances of wind farms (which are also installed, more than 1,600 feet [or 500 m] from human habitations), resistance

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