Wind power. View of a large wind farm in California. Wind turbines are an important form of alternative power for electricity generation. They produce no emissions and have a low running cost. Modern turbines, which may vary the pitch of the blades, may adjust to varying wind speeds automatically, ensuring a more constant supply. The main drawbacks of wind power are a high initial capital cost and noise from the turbines. This area of California, San Gorgonio Pass, has about 3500 wind turbines, producing 600 million kilowatt-hours of electricity per year, enough to supply a town of 100,000 homes.
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