; and furniture and furnishings to be expended under the control and supervision of the Architect of the Capitol, $147,501,000, of which $60,700,000 shall remain available until September 30, 2028, and of which $1,000,000 shall remain available until expended: Provided, That of the amounts made available under this heading, $5,135,000 shall be for contractual obligations of the Senate restaurants. 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