The US Department of the Interior (DOI) has awarded Ameresco an Energy Savings Performance Contract (ESPC) valued at $77 million over its 20-year term to provide for the implementation of water conservation and energy efficiency measures and ongoing energy management services to the DOI headquarters building in Washington, DC.
Through the comprehensive ESPC, Ameresco will install a combination of measures to reduce energy and water consumption within the seven-story, 1.3 million-sq-foot headquarters building. The project is designed to reduce domestic water consumption by 70 percent through the installation of new plumbing fixtures and the harvesting of groundwater that is currently collected under the building and discharged to storm drains. Ameresco will treat and store the harvested groundwater in a re-purposed chilled water storage tank for non-potable uses including irrigation, cooling tower makeup water supply, and toilet and urinal flushing in bathrooms.
The energy efficiency project is expected to reduce electricity consumption by 31 percent and to reduce steam utilization by 12 percent. These reductions will be accomplished by the installation of over 9,400 solid state LED technology fixtures controlled by a new advanced lighting control system that will be integrated into the building automation system.
A new open-protocol direct digital control (DDC) system also will be installed to optimize the overall energy performance of the building through building-wide control of heating, ventilating, and air-conditioning (HVAC). To improve the envelope of the building, Ameresco will install over 500 new windows with between-glass blinds to reduce heating and cooling losses to the outside environment.
The ESPC is expected to result in first year savings of more than $3.2 million and to provide for $87 million in energy and cost savings during the 18-year performance period and two-year implementation period of the contract.