; 2 U.S.C. 2001 note). Capitol Power Plant For all necessary expenses for the maintenance, care and operation of the Capitol Power Plant; lighting, heating, power (including the purchase of electrical energy) and water and sewer services for the Capitol, Senate and House office buildings, Library of Congress buildings, and the grounds about the same, Botanic Garden, Senate garage, and air conditioning refrigeration not supplied from plants in any of such buildings