Made in China: ­Suntech has become a major supplier of solar panels worldwide, including the ones used at this massive eight-megawatt solar farm in Alamosa, CO. Credit: Brian Bailey

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To see the future of solar power, take an hour-long train ride inland from Shanghai and then a horn-blaring cab trek through the smog of Wuxi, a fast-growing Chinese city of five million. After winding through an industrial park, you will arrive at the front door of Suntech Power, a company that in the few years since its founding has become the world's largest maker of crystalline-silicon solar panels.

Solar panels cover the entire front face of the sprawling eight-story headquarters. Nearly 2,600 two-meter-long panels form the largest grid-connected solar façade in the world. Together with an array of 1,800 smaller panels on the roof, it can generate a megawatt of power on a sunny day. It's expected to produce over a million kilowatt-hours of electricity in a year--enough for more than 300 people in China.