Audit and Advise On DDC & BAS Systems to Reduce Energy Consumption

Project Background

Market: Government

Built in 1936, the Department of Interior (DOI) Main Interior Building (MIB) boasts a rich history as the first building constructed in Washington, D.C. under President Franklin D. Roosevelt’s “New Deal” program. This seven-story, 1.3 million square foot headquarters building houses the offices of the Secretary of the Interior, department employees, Interior Museum, and Interior Library.

Department of Interior Building in Washington DC, United States

Department of Interior MIB

The Problem

The DOI set a goal of achieving energy independence by 2035, which coincided with their sustainability mission to manage their energy, water, and natural resources. To achieve this goal, Ameresco, a leading energy efficiency and renewable Energy Services Company (ESCO), was awarded the $77 Million 20-year term Energy Savings Performance Contract (ESPC) to reduce electricity consumption by 31% and steam utilization by 12 percent.

Our Solution

Ameresco retained the expertise of CQS to help evaluate the existing Direct Digital Control (DDC) system. Through a comprehensive building system Investment Grade Audit (IGA), CQS designed a comprehensive DDC bid package and provided technical facilitation support throughout the construction period. The new Building Automation System (BAS) was required to integrate and control all major HVAC equipment in the building including the newly upgraded central boiler and chiller plants and microturbine Combined Heat and Power (CHP) systems. In addition, the BAS was also required to integrate to new lighting controls and a reverse osmosis water filtration system.


As BAS Subject Matter Experts (SMEs), CQS:

  • Designed a state-of-the-art BAS utilizing the BACnet protocol
  • Developed a comprehensive BAS bid package
  • Managed BAS installation contractor selection
  • Oversaw the installation of the new BAS
  • Managed the submittal and RFI process
  • Oversaw all commissioning and checkout procedures