The Federal Energy Regulatory Commission (FERC) has authorized the Atlantic Sunrise expansion project, a Williams Partners project, that will expand its existing Transco natural gas pipeline to connect Marcellus gas supplies with markets in the Mid-Atlantic and Southeastern Unites States.
Williams anticipates beginning construction on the mainline portion of the project facilities in mid-2017. These mainline facilities will create a path from the northern part of the Transco system to markets along the US Eastern Seaboard for a portion of the project capacity in time for the 2017-2018 heating season. Construction on the Central Penn Line, the greenfield portion of the project, is targeted to begin early in the third quarter of 2017, which would allow the full project capacity to be placed into service in mid-2018.
The project’s proposed aboveground facilities include two new compressor stations in Pennsylvania, additional compression and related modifications to three existing compressor stations in Pennsylvania and Maryland; two new meter stations and three new regulator stations in Pennsylvania; and minor modifications at existing aboveground facilities at various locations in Pennsylvania, Virginia, Maryland, North Carolina, and South Carolina to allow for bi-directional flow.
The project consists of approximately 200 miles (321 km) of pipe, including about 185 miles (297 km) of new natural gas pipeline in Pennsylvania, 11 miles (18 km) of pipeline looping in Pennsylvania, 2.5 (4 km) miles of pipeline replacements in Virginia. Once complete, the Atlantic Sunrise expansion will help alleviate infrastructure bottlenecks in Pennsylvania, connecting Marcellus gas supplies with markets in the Mid-Atlantic and Southeastern United States. The nearly US$3 billion expansion of the existing Transco natural gas pipeline is designed to increase deliveries by 1.7 bcfd (48 x 106 m3/d).
The project will involve the construction of the following facilities:
- A 30,000 hp (22,380 kW) electric motor-driven greenfield compressor station on the Central Penn Line North, in Wyoming County, Pennsylvania (Compressor Station 605);
- A 40,000 hp (29,840 kW) electric motor-driven greenfield compressor station on the Central Penn Line South, in Columbia County, Pennsylvania (Compressor Station 610);
- The addition of 52,000 hp (38,792 kW) turbine driven compression and related modifications at three of Transco’s existing compressor stations:
- 6000 hp (4476 kW) at Compressor Station 520 in Lycoming County, Pennsylvania;
- 16,000 hp (11,936 kW) at Compressor Station 517 in Columbia County, Pennsylvania;
- 30,000 hp at Compressor Station 190 in Howard County, Maryland.
- Two new meter stations and three new regulator stations with interconnecting piping in Pennsylvania;
- Modifications at existing Compressor Stations 190, 185, 170, 160, 150, and 145 in Maryland, Virginia, and North Carolina to enable compression for bi-directional flow;
- Installation of odor masking/deodorization equipment at existing Compressor Stations 160, 155, 150, and 145 in North Carolina;
- Supplemental odorization, odor detection, and or odor masking/deodorization equipment at 42 meter/regulator stations and 14 mainline valve sites in North Carolina and South Carolina;
- Modifications to an existing meter station in Pennsylvania for use of shared facilities with a new meter station;
- Additional ancillary facilities, such as mainline valves, cathodic protection, communication towers, and internal inspection device launchers and receivers;
- Related appurtenant underground and aboveground facilities.