The Capitol Power Plant (CPP) jurisdiction manages the year-round operation of the power plant, providing steam and chilled water to heat and cool the U.S. Capitol and 22 other facilities on or around Capitol Hill. In addition to the central steam and refrigeration plants, the jurisdiction also maintains an administration building and the utility tunnel distribution and metering system.
The power plant operates on a reimbursable basis to non-congressional facilities and procures electricity from commercial suppliers. Construction of the Capitol Visitor Center prompted the plant's expansion in the early 21st century. In support of the Architect of the Capitol's long-term energy program, the CPP is currently the site of two of the agency's major construction projects: the West Refrigeration Plant Revitalization and the Cogeneration Plant.