every 3 years thereafter, file with the Commission a plan that identifies, and to facilitate the construction of, interregional electric transmission projects that are efficient, cost-effective, and broadly beneficial. (b) Considerations In determining the requirements for a plan described in subsection (a), the Commission shall take into consideration— (1) the need for the transmission systems to operate for a minimum of 20 years and across a wide range of scenarios, including scenarios that take into account— (A) Federal, State, and local laws and regulations, and other factors that affect electricity demand and the current and future generation resource mix