The Attorney General may terminate or modify a voluntary agreement, in writing, after consultation with the Chairman of the Federal Trade Commission and the Secretary of Energy (or the appropriate delegated Department of Energy official). The Secretary of Energy (or the appropriate delegated Department of Energy official) may also terminate or modify a voluntary agreement, in writing, after consultation with the Attorney General and the Chairman of the Federal Trade Commission. Any person who is a party to a voluntary agreement may terminate his participation in the agreement upon written notice to the Secretary of Energy. Effective immediately upon modification or termination of a voluntary agreement or plan of action, any antitrust immunity conferred upon the participants in that voluntary agreement or plan of action by section 708(j) of the Defense Production Act (DPA) of 1950 (50 U.S.C. 4558(j)) shall not apply to any act or omission occurring after the time of such termination or modification.