Dominion Transmission Inc. (DTI) has received US Federal Energy Regulatory Commission (FERC) approval to begin construction on compressor stations in Pennsylvania and Virginia that are associated with the Leidy South Project. DTI filed its application with FERC on May 15, 2015. The project will provide 155,000 dekatherms per day of firm transportation service and add approximately 48,120 horsepower of compression and new metering and regulation equipment to DTI’s existing interstate pipeline transmission system.
The US$210 million Leidy South Project will provide gas supply to existing and new electric power-generation facilities. According to DTI, access to new natural gas supply is critical to offsetting coal-fired, electricity-generating plant retirements that are projected to take place across the country over the next few years.
Compressor stations approved for construction are the Finnefrock Compressor Station, the Chambersburg Compressor Station, and the Leesburg Compressor Station.
Finnefrock Compressor Station
Located in Clinton County, Pennsylvania, DTI will replace two existing Ingersoll-Rand compressor units (Units 1 and 2) with one new Solar Taurus 70 compressor unit rated at approximately 10,915 hp. Units 1 and 2, installed in 1962, are each rated 1100 hp. Following the hp replacement, the station will have a eight compressor units and a horsepower of approximately 42,215
In addition to the new compressor unit, DTI proposes to install a 555-kW natural gas-fueled generator, a discharge gas cooler, and a blowdown silencer. Ancillary systems and equipment, piping, electrical, and controls infrastructure also will be installed to support the new system.
Chambersburg Compressor Station
Located in Franklin County, Pennsylvania, DTI will add one Solar Mars 90 compressor unit rated at 13,220 hp, a discharge gas cooler, and a blowdown silencer. The existing compressor station building will be expanded to house the new compressor unit. Ancillary systems and equipment, piping, electrical, and controls infrastructure also will be needed to support the new system.
Leesburg Compressor Station
Located in Loudoun County, Virginia, DTI will install a new 8000-hp electric motor driven compressor. DTI will rework two existing reciprocating engines and install a discharge gas cooler. New construction will include extending the existing compressor building to house the new compressor as well as installation of a new power distribution and control building.