The Enhancing Electric Grid Resilience Act would amend federal energy law to allow companies building major electric transmission lines to propose how costs should be split among customers. The bill applies to new interstate transmission lines and offshore transmission lines with capacity of at least 1,000 megawatts, as well as significant expansions that add 500 megawatts or more. Under the bill, the Federal Energy Regulatory Commission would review cost allocation proposals and ensure that costs are distributed among customers in a way that roughly matches the benefits they receive, considering factors like reliability, economics, environmental impacts, and resilience. The bill does not specify new federal funding or establish a timeline beyond requiring that affected transmission facilities be completed after the law's enactment. This legislation is intended to clarify how costs for major grid modernization projects can be fairly allocated across multiple states and regions that benefit from improved transmission capacity.