Executive Order 11790: Providing for the effectuation of the Federal Energy Administration Act of 1974 [open html - 32KB]
This Executive Order deals with the authority of the Secretary of Energy to delegate authority within the Federal Energy Administration.
Executive Order 11790; EO 11790
National Archives: https://www.archives.gov/
39 FR 23185, 3 CFR, 1971-1975 Comp., p. 882