Williams operates a natural gas transmission pipeline known as the Transco pipeline, which transports natural gas from production areas to customers, such as utility companies and power plants, located throughout the eastern United States.
The Atlantic Sunrise Project is designed to supply enough natural gas to meet the daily needs of more than 7 million American homes by connecting producing regions in northeastern Pennsylvania to markets in the Mid-Atlantic and southeastern states. The expansion adds 1.7 million dekatherms per day of pipeline capacity to the Transco system.
The project includes compression and looping of the Transco Leidy Line in Pennsylvania along with a greenfield pipeline segment, referred to as the Central Penn Line, connecting the northeastern Marcellus producing region to the Transco mainline near Station 195 in southeastern Pennsylvania. Additional existing Transco facilities are being added or modified to allow gas to flow bi-directionally.
The project design includes a total of approximately 183 miles of new greenfield pipe (Central Penn North & Central Penn South), two pipeline loops totaling about 12 miles (Chapman Loop, Unity Loop), two and half miles of existing pipeline replacement, two new compressor facilities in Pennsylvania, and other facility additions or modifications in five states (Pennsylvania, Maryland, Virginia, North Carolina, South Carolina).
Construction began in spring 2016 on the mainline portion of the Atlantic Sunrise project designed to accommodate bidirectional flow on the existing Transco pipeline system. On Sept. 15, 2017, the Federal Energy Regulatory Commission (FERC) issued its notice to proceed for the Atlantic Sunrise pipeline expansion. With all necessary permits and construction releases in place, Williams began construction for the greenfield portion of the project in Pennsylvania in late September. On Aug. 24, 2018, Williams filed with FERC to activate the Atlantic Sunrise pipeline on Sept. 10, 2018.