; and (B) the construction of which is completed on or after the date of enactment of this section; (2) an electric power transmission line (and any facilities necessary for the operation of such electric power transmission line) that is located offshore, the construction of which is completed on or after the date of enactment of this section; or (3) an expansion of, or upgrade to, an interstate electric power transmission line (and any facilities necessary for the operation of such electric power transmission line) that— (A) increases the transmission capacity of such electric power transmission line by at least 500 megawatts; and (B) the construction of which is completed on or after the date of enactment of this section. (c) Savings provision This section does not affect the authority of the Commission to approve the allocation of costs of transmission facilities other than transmission facilities of national significance. . 104. Allocation of costs of electricity interconnection and network upgrades Part II of the Federal Power Act ( 16 U.S.C. 824 et seq. ) is further amended by adding at the end the following: 226. Allocation of costs of electricity interconnection and network upgrades (a) In general Not later than 18 months after the date of enactment of this section, the Commission shall issue regulations, under section 206, that prohibit the use of exclusive or disproportionate participant funding in allocating the costs of a network upgrade. (b) Requirements In prohibiting the use of exclusive or disproportionate participant funding under the regulations issued under subsection (a), the Commission shall, except as provided in subsection (c), require that each transmitting utility— (1) shall not allocate the costs of a network upgrade solely or disproportionately to the requesting interconnection customer