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Capitol Power Plant
The Capitol Power Plant is a fossil-fuel burning power plant which provides steam and chilled water for the United States Capitol, the Supreme Court, the Library of Congress and 19 other buildings in the Capitol Complex. Located at 25 E St SE in southeast Washington, D.C., it is the only coal-burning power plant in the District of Columbia, though it mostly uses natural gas. The plant has been serving the Capitol since 1910, and is under the administration of the Architect of the Capitol (see ). Though it was originally built to supply the Capitol complex with electricity as well, the plant has not produced electricity for the Capitol since 1952.〔 Electricity generation is now handled by the same power grid and local electrical utility (Pepco) that serves the rest of metropolitan Washington.
According to the U.S. Department of Energy, the facility released 118,851 tons of carbon dioxide in 2007.〔"(Capitol power plant dims clean energy hopes )." Associated Press.〕 In 2009 it switched to using natural gas, unless coal was needed for backup capacity. In 2013, it was announced that the Capitol Power Plant would add a Cogeneration Plant to the CPP that will use natural gas in a combustion turbine in order to efficiently generate both electricity and heat for steam, thus further reducing emissions.〔
==History==
The power plant was constructed under the terms of an act of Congress passed on April 28, 1904, authorized in order to support two new office buildings that were then being planned. Now known as the Cannon House Office Building and the Russell Senate Office Building, these new offices required a substantial increase in energy to Capitol Hill. In addition, the U.S. Capitol and the Library of Congress would also receive power from the new plant, along with all future buildings to be constructed on the Capitol campus.〔
Originally called the "Heating, Lighting, and Power Plant," the Capitol Power Plant was one of the earliest 25-cycle alternating current electric-generating facilities in the United States. The original steam boilers were replaced in 1923. In 1950, the steam boilers were modernized and replaced with coal-fired steam generators; at the same time, the plant's electricity generating capacity had reached its limit, and it was decided to abandon electricity production in favor of the local electrical utility. Expansion of the plant to support additional new construction was authorized in 1958, 1970, and in the early 21st century to support the opening of the Capitol Visitor Center.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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