42 U.S. Code § 8374 - Emergency authorities
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.
The President may, by order, stay the application of any provision of this chapter, or any rule or order thereunder, applicable to any new or existing electric powerplant, if the President finds, and publishes such finding, that an emergency exists, due to national, regional, or systemwide shortages of coal or other alternate fuels, or disruption of transportation facilities, which emergency is likely to affect reliability of service of any such electric powerplant.
The authority of the President to issue any order under this section may not be delegated. This subsection shall not be construed to prevent the President from directing any Federal agency to issue rules or regulations or take such other action, consistent with this section, in the implementation of such order.
Any order issued under this section shall be published in the Federal Register. To the greatest extent practicable, the President shall, before issuing any order under this section, but in no event later than 5 days after issuing such order, report to the Congress of his intention to issue such order and state his reasons therefor.
 See References in Text note below.
This chapter, referred to in subsec. (c), was in the original “this Act”, meaning Pub. L. 95–620, Nov. 9, 1978, 92 Stat. 3289, known as the Powerplant and Industrial Fuel Use Act of 1978, which is classified principally to this chapter. For complete classification of this Act to the Code, see Short Title note set out under section 8301 of this title and Tables.
Subchapter II (§ 1621 et seq.) of September 14, 1976 (Public Law 94–412)”, which is known as the National Emergencies Act.chapter 34 of title 50, referred to in subsec. (d)(4), was in the original “title II of the Act of
1987—Subsec. (g). Pub. L. 100–42 struck out subsec. (g) which permitted use of natural gas or petroleum as primary energy source in peakload powerplant or major fuel-burning installation during temporary emergency condition (other than emergency conditions provided for under section 8302(a)(15) of this title).