Washington, DC

U.S. Library of Congress

Scope of Services
Investment Grade Energy Audit
Energy Modeling

As part of an Initial Proposal (IP) for an Energy Savings Performance Contract (ESPC) delivered to the Architect of the Capitol, 2RW conducted energy audits at three buildings of the Library of Congress in Washington, DC: the Thomas Jefferson Building, the John Adams Building, and the James Madison Building. The scope of work included identifying, quantifying, and costing energy conservation measures for mechanical and building automation systems.

2RW Project Case Study Main Image

2RW consulted the American Library Association and the Library of Congress standards for long-term preservation when selecting options for improving the energy efficiency of the facilities. The following highlight some of the significant conservation opportunities 2RW engineers identified:

  • temperature and ventilation scheduling with optimized start
  • carbon monoxide control for parking garage ventilation
  • air economizer
  • variable volume range hood controls
  • restoration and expansion of variable air volume controls
  • ground source heat pumps
  • decentralization from the Capitol Power Plant
  • dedicated heat recovery chillers

Energy savings were analyzed using eQUEST, an hour-by-hour building energy simulation software program. 2RW engineers developed energy models which were calibrated to available utility data. The calibrated models served as the baseline against which each conservation measure was quantified.


2RW was able to find over $30,000,000 of energy efficiency projects resulting in over $3,800,000 per year of energy savings. If implemented, the conservation measures would have paid for themselves within the term of a performance contract.

Scope of Services
Investment Grade Energy Audit
Energy Modeling

OWNER: United States Government, Architect of the Capitol

TIMEFRAME: 2007 – 2008

SIZE: 3,851,654 SF