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Wind turbines line the hills at the Altamont Pass wind farm located in the Altamont Pass of the Diablo Range in San Francisco, Central California. It is one of the earliest wind farms in the United Stated and is composed of over 4900 relatively small wind turbines of various types, which made it at one time the largest farm in the world in terms of capacity. Altamont Pass is still the largest concentration of wind turbines in the world.