qualifying electric transmission transaction
(3) Qualifying electric transmission transaction For purposes of this subsection, the term “qualifying electric transmission transaction” means any sale or other disposition before January 1, 2008 (before January 1, 2021 , in the case of a qualified electric utility), of— (A) property used in the trade or business of providing electric transmission services, or (B) any stock or partnership interest in a corporation or partnership, as the case may be, whose principal trade or business consists of providing electric transmission services, but only if such sale or disposition is to an independent transmission company.