If the President declares a severe energy supply interruption, as defined in section
6202
(8) of this title, the President may, by order, prohibit any electric powerplant or major fuel-burning installation from using natural gas or petroleum, or both, as a primary energy source for the duration of such interruption. Notwithstanding any other provision of this section, any suspension of emission limitations or other requirements of applicable implementation plans, as defined in section
7410
(d) of this title, required by such prohibition shall be issued only in accordance with section
7410
(f) of this title.