of existing funds The Administrator shall use any funds authorized and appropriated to the Western Area Power Administration on an annual basis to carry out the duties of the Administrator under this Act. (c) No retroactive rates Notwithstanding any other provision of law, the Administrator shall not recover any rate reduction provided pursuant to this section in future rates. (d) Effect on water rights Nothing in this Act— (1) alters or affects any water rights held by— (A) the United States