Builders of the controversial Atlantic Coast Pipeline told federal authorities they will delay construction along 21 miles in West Virginia and 79 miles in Virginia until the U.S. Fish and Wildlife Service (FWS) issues a revised "incidental take statement," which limits the number of threatened or endangered species that might be accidentally killed or harmed during development activities.

Lead developer Dominion Energy filed documents Tuesday with the Federal Energy Regulatory Commission in response to the 4th U.S. Circuit Court of Appeals' ruling last week. The court sided with environmental groups and their lawyers that the FWS' initial review was not clear enough in the case of the $6.5 billion pipeline and vacated one of its key permits.