; and (4) in the undesignated matter following subparagraph (B) of paragraph (1) (as so redesignated), by striking No such rule and inserting the following: (2) Limitation No rule . (c) Termination of mandatory purchase requirements Section 210(m)(1) of the Public Utility Regulatory Policies Act of 1978 ( 16 U.S.C. 824a–3(m)(1) ) is amended— (1) in subparagraph (B)(ii), by striking or at the end; and (2) by striking subparagraph (C) and inserting the following: (C) any independently administered, voluntary, auction-based energy market (including an energy imbalance market), regardless of whether— (i) an applicable electric utility participating in such a market is a member of a regional transmission organization or an independent system operator; or (ii) such a market has a governance structure and operation that is wholly separate and autonomous from a regional transmission organization or an independent system operator