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U.S. Department of State

Diplomacy in Action

EARTH DAY 2011 - U.S. Embassy Sofia Increases its Energy-Efficiency

Media Note
Office of the Spokesman
Washington, DC
April 15, 2011


Building on its reputation as the first U.S. Embassy to receive the prestigious status of LEED® Certified, the U.S. Embassy in Sofia, Bulgaria, celebrates Earth Day 2011 with a ribbon-cutting ceremony today in honor of the facility’s new Dedicated Heat Recovery Chiller (DHRC™).

The DHRC™ is an American-made, ultra-high efficiency chiller that reclaims “waste heat” discharged from electrical loads inside the building, and converts it into hot water to heat the U.S. Embassy. This reduces the amount of air conditioning, and saves on the consumption of natural gas, electricity, and district steam.

In recent years, escalating energy costs, as well as concerns over global resources and green house gas emissions, have placed emphasis on energy-efficiency in U.S. Federal Government buildings. Like all our embassies and consulates, the U.S. Embassy in Sofia takes the goal to reduce consumption very seriously. Pushing the Embassy building beyond its status of LEED® Certified, the dedicated Embassy staff continues to work for reductions in energy and water consumption, and improved energy-efficiency. U.S. The installation of the DHRC™ is a notable milestone towards the U.S. Government’s end goal to design, and ultimately operate, net-zero energy buildings.

The DHRC™ was installed by a design-build team including Martinez International Corporation of Aurora, Colorado; Multistack of Sparta, Wisconsin; and H&A Architects & Engineers (H&A) of Richmond, Virginia.

This same team installed the U.S. Department of State’s first application of DHRC™ technology in Santiago, Chile, three years ago. To date, that installation has reduced carbon dioxide emissions by the U.S. Embassy Santiago by nearly 80 percent and generated heat at a quarter of the cost of using fossil fuel. Additionally, the installation resulted in a $47,000 reduction in heating cost during its first six months of operation at U.S. Embassy Santiago.

The U.S. Department of State is committed to energy-efficiency and the investigation of alternative sustainable opportunities. The application of DHRC™ is yet another example of the U.S. Department of State’s efforts to provide platforms that demonstrate “eco-diplomacy.”

For further information, please contact Christy Foushee at or at (703) 875-4131.

PRN: 2011/592

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