Centerbrook Architects and Planners has practiced innovative sustainable design since the 1970s with its own office serving as a laboratory for green architecture. Centerbrook?s office has a rich array of sustainable elements including a green roof, roof top solar photovoltaic panels, a hydro power turbine, and energy efficient interior lighting. The firm currently generates 30% of its own electricity itself using solar and hydro power. The greenroof was installed on September 21, 2004.