Colorado State Capitol, Denver
The Colorado State Capitol in Denver achieved greater energy efficiency through a series of building upgrades. The structure was the first state capitol in the country to earn LEED status. The renovations will eventually pay for themselves because of significantly lower energy and operational costs.
In addition to the kind of heating and cooling upgrades that most building on this list undertook, the capitol received new lighting and new energy metering and control systems. Environmentally-friendly landscaping practices and non-toxic cleaning products were also a part of the greening efforts. Built in the same style as many other state capitol buildings in the U.S., the Colorado State Capitol was first opened in 1895. Even after the significant renovations, the historic appearance of its interior and exterior remains unchanged.