Energy Efficient Building
Uses Thermal Energy Storage

              In addition to shifting usage to inexpensive off-peak hours, today’s thermal energy storage reduces energy usage.  For years, TES has been known for saving customers money by shifting electrical usage to off-peak hours.  However, only a few designers believed it saved energy.  “Hopefully, this first-place finish will convince the rest that TES is a very ‘green’ technology,” stated Calmac’s President Mark MacCracken.

        When choosing electric providers, TES building owners’ negotiating positions will be enhanced, since thermal energy storage lowers peak demands for electric utility companies, helping them to avoid blackouts.  It enables these providers to serve more customers with existing generating capacity, particularly in the new deregulated utility market.

            “We are very proud that thermal energy storage’s capabilities were utilized in this exciting building.  The Energy Star Building Label is a significant achievement for many facilities, but we are particularly delighted to know our Ice Bank tanks helped create one of the highest scores ever achieved in the rating system,” MacCracken said.



Dallas- The most energy efficient building in the United States, according to the Department of Energy (DOE) and the Environmental Protection Agency (EPA), is the Centex Building at the International Center in Dallas.  The building has earned a score of 99 (out of a possible 100) in the EPA/DOE Energy Star® Label for Buildings program, the first building in the country to achieve that rank.  The Energy Star program rates energy performance based on actual energy use, which makes it possible to compare the overall efficiency of buildings nationwide.  Buildings with a score of 75 or more earn the right to display the Energy Star label.  The program monitors these buildings for a period of one year to determine actual operating performance.

            Engineered and developed by Harwood Management Services, a member of the Harwood International Corporation, the Centex Building was designed as the corporate headquarters for Centex, one of the nation’s largest residential home developers and construction contractors. 



The Centex Building earned a 99 out of 100 rating in the EPA/DOE Energy Star Program


The Centex Construction Group was the construction contractor for this project.

            The building consists of 176,384 rentable square feet (16,390m²) plus a parking garage of 180,000 square feet (16,722m²).  A key part of the building’s efficiency is attributable to its cooling system.  By combining thermal energy storage (14 Calmac [Booth 2851] Ice Banks tanks) with a helical rotary water-cooled chiller, the building’s peak electrical load is significantly reduced.