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Capitol Power Plant

The Capitol Power Plant provides steam and chilled water used to heat and cool buildings throughout the Capitol campus. In December 1910, the plant started operations, generating steam and electricity for the Capitol building. In 1951 it ceased generating electricity. The plant has been enlarged many times to keep up with expansion of congressional offices and corresponding increase in heating and cooling demands of the Capitol campus.


This official Architect of the Capitol photograph is being made available for educational, scholarly, news or personal purposes (not advertising or any other commercial use). When any of these images is used the photographic credit line should read “Architect of the Capitol.” These images may not be used in any way that would imply endorsement by the Architect of the Capitol or the United States Congress of a product, service or point of view. For more information visit

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Taken on December 12, 2011