16 U.S.C. § 822 : Conservation — Federal Regulation And Development Of Power — Regulation Of The Development Of Water Power And Resources — Reservation Of Right To Alter Or Repeal Chapter

The right to alter, amend, or repeal this chapter is expressly reserved; but no such alteration, amendment, or repeal shall affect any license theretofore issued under the provisions of this chapter or the rights of any licensee thereunder.