primary energy source
For purposes of this section, the terms “small power production facility”, “qualifying small power production facility”, “qualifying small power producer”, “primary energy source”, “cogeneration facility”, “qualifying cogeneration facility”, and “qualifying cogenerator” have the respective meanings provided for such terms under section 3(17) and (18) of the Federal Power Act [ 16 U.S.C. 796(17) , (18)].