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Photograph of people walking outside on a Self-Guided Tour of Capitol Hill
Visitors can tour many highlights on Capitol Hill without registering.

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The Architect of the Capitol’s challenge is unique – maintaining aging, iconic buildings; adapting state-of-the-art technology; and increasing responsiveness to environmental, security and safety considerations in a rich historical setting.
The Architect of the Capitol's challenge is unique – maintaining aging, iconic...

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Abraham Lincoln's second inaugural at the U.S. Capitol
AOC Public Affairs Officer Matt Guilfoyle watches "Lincoln" and...

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Capitol Power Plant

AOC's Glenn Mullen checks readings of a boiler at the Capitol Power Plant.

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.