The Sears Tower plans to cut energy costs by 80% by using wind and solar energy, as well as using other technologies like green roofs.

Wind turbines will be tested to take advantage of the tower’s height and unique set-back roof areas. Solar hot-water panels will help heat water for the building. Green roofs that can sustain high-altitude conditions, and that will be among the tallest in the world, will be tested to reduce storm water runoff, improve insulation help mitigate the urban heat island effect.

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