; or (B) a higher coincident interregional transfer capability established in accordance with subsection (b)(1)(B). (6) Minimum interregional transfer requirement The term minimum interregional transfer requirement means any requirement to meet or maintain a minimum interregional transfer capability. (b) Establishment of minimum interregional transfer capabilities (1) In general Not later than 18 months after the date of enactment of this section, the Commission shall promulgate a final rule that— (A) requires each interregional transmission planning region to establish or increase interregional transfer capabilities such that the coincident interregional transfer capability of each interregional transmission planning region is not less than the lesser of— (i) 30 percent of its own present-day coincident peak load; and (ii) the sum obtained by adding— (I) the present-day coincident interregional transfer capability of the interregional transmission planning region; and (II) 15 percent of its own present-day coincident peak load; (B) on a showing of net benefits, may require 1 or more interregional transmission planning regions to meet or maintain a coincident interregional transfer capability that exceeds the applicable minimum interregional transfer capability described in subparagraph (A); (C) based on the applicable minimum interregional transfer capability, shall govern the establishment of minimum interregional transfer requirements for interconnections between interregional transmission planning regions; (D) calculates the present-day coincident interregional transfer capabilities of the interregional transmission planning regions by— (i) defining the present-day coincident interregional transfer capability of each interregional transmission planning region as being equal to the greater of— (I) the coincident import capability of the interregional transmission planning region; and (II) the coincident export capability of the interregional transmission planning region