
I came back from the Sierra to Bay Area yesterday by passing gigantic Wind Turbines in Altamont Pass, located in the Diablo Range, near Interstate 580. Wind energy is said to be cost about 7 cents per kilowatt-hour by 2020. According to the Wikipedia, the wind farm is composed of over 6000 wind turbines, making 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, producing about 125 MW on average. They were installed after the 1970s energy crisis in response to favorable tax policies for investors. Along the same Interstate, I saw solar panels on top of the poles of emergency phones etc. California can be not only Golden but also "Green" State.