2012 Technology Award Case Studies existing wetlands without compromising either one and allows water to fluctuate between the wetlands without harming the building. Reduction in Green House Gases Energy efficient design and generation of clean electric power on site reduced annual emissions of GHGs. GHGs are expressed in terms of carbon dioxide equivalents (CO2e), which is the sum total of carbon dioxide, nitrous oxide, and methane emissions normalized relative GHG impact of CO2. Natural gas emits 11.7 lb of CO2 per therm. Regionally, the average emission rate of electricity is 1.5 lb/kWh according to the U.S. Environmental Protection Agency‘s Emissions and Generation Resources Integrated Database. Based on the CBECS (Midwest) Energy Use Index (EUI), the saving in GHGs emissions are 118,311 lb/year. The solar gain is offset using large overhanging eaves on the south-facing façade and minimal eaves to the north. Conclusion The building opened in April 2007 and continues to receive positive feedback. The Interpretive Center and site are used to educate visitors in two major areas: green technology/ sustainability and prairie ecology. A variety of programs are offered to school and scout groups, as well as group tours. The building is used about 30% to 50% more than was reflected in the data used in preparing the energy simulation model. Visitation is continuing to increase. The project shows that an integrated approach in building systems design and involvement of all the stake holders from early stages of the project can help in cost controls and make the building energy efficient. www.info.hotims.com/41646-37 December 2012 ASHRAE Journal 51