Transco plans gas pipeline to a 1,580-MW project of Virginia Power

Transcontinental Gas Pipe Line Co. LLC (Transco) applied March 23 at the Federal Energy Regulatory Commission for a certificate of public convenience and necessity authorizing Transco to construct and operate its Virginia Southside Expansion Project II (VSEP II).

This expansion of Transco’s existing system will provide 165,000 dekatherms per day (dt/day) of incremental firm transportation service from Transco’s Zone 6 Station 210 Pooling Point located on Transco’s mainline in Mercer County, New Jersey, and 85,000 dt/day from Transco’s Zone 5 Station 165 Pooling Point located in Pittsylvania County, Virginia, for a total of 250,000 dt/day, to a proposed delivery point located near milepost 4.33 on Transco’s proposed Greensville Lateral, which is located near milepost 5.2 on Transco’s Brunswick Lateral (called the “Greensville Delivery Point). Virginia Power Services Energy Corp. will acquire 100% of the project capacity.

Transco requests that the commission issue a final order granting these authorizations by Jan. 1, 2016, which will accommodate the needs of Virginia Power and enable Transco to meet a Dec. 1, 2017 target in-service date. Transco estimates that the proposed facilities will cost approximately $190.8 million.

The project will involve the construction and operation of approximately 4.33 miles of greenfield pipeline facilities, 21,830 horsepower (ISO) of gas turbine-driven compression, 25,000 horsepower of electric motor driven compression and the construction or modification of associated aboveground and underground facilities.

“The 250,000 dt/day of Project capacity is designed to serve 100% of the gas requirements of [Virginia Electric and Power Co.’s] proposed 1,580 megawatt, combined-cycle, natural gas-fired power station in Greensville County, Virginia (‘Greensville County Power Station’),” said the application. “The Project is not dependent on, or related to, the construction of other infrastructure upstream of the Project facilities.”

The application added that this project will build on a prior one: “VSEP II will expand capacity on Transco’s mainline and South Virginia Lateral (‘SVL’) utilizing the same path as VSEP I. The pipeline facilities authorized in VSEP I include: (i) approximately 91 miles of 24-inch pipeline looping along Transco’s existing SVL; (ii) the addition of 21,830 horsepower (ISO) at a new Compressor Station No. 166 located at the beginning of the SVL; and (iii) the Brunswick Lateral, which consists of approximately seven miles of 24-inch greenfield pipeline to the Brunswick County Power Station in Brunswick County, Virginia. The extensive looping of the SVL and construction of the Brunswick Lateral, as part of VSEP I, have allowed the VSEP II capacity to be created almost exclusively through the addition of compressor station horsepower. In fact, the only material pipeline facility to be constructed in VSEP II is the 4.33 mile Greensville Lateral originating at milepost 5.2 on the seven mile Brunswick Lateral. Thus, VSEP II will benefit significantly from the relatively inexpensive expansibility made possible by VSEP I.”

Virginia Electric and Power (VEPCO), a unit of Dominion Resources (NYSE: D), has not officially announced the Greensville project but has confirmed it is working on it. Brunswick County is a 1,358-MW project of VEPCO where construction commenced in the third quarter of 2013 with commercial operations to begin in mid 2016.

PJM Interconnection issued a November 2014 System Impact Study, which is a mid-point in the generation project interconnection process, for a 1,681-MW combined-cycle project that would be located in Greensville County. The project, under queue #Z1-086, will interconnect into the VEPCO system via a new three breaker ring bus switching station that connects to the Carson-Heritage 500-kV line. The project in-service date in the study is Dec. 1, 2018, though that may change as the queue review process goes along.

Said the PJM study: “The Queue Project Z1-086 was studied as a 1630.0 MW (Capacity 1630.0 MW) injection tapping the Carson-Brunswick 500 kV line in the ITO area. Project Z1-086 was evaluated for compliance with applicable reliability planning criteria (TP, NERC, NERC Regional Reliability Councils, and Transmission Owners) for summer peak conditions in 2017. The stability analysis used a 2019 model and 1681 MW injection. Queue project Z1-086 was studied with a commercial probability of 100%.”

The Federal Energy Regulatory Commission in September 2014 accepted PJM’s July 2014 filing of an executed interim interconnection service agreement for this project, which entered the PJM queue in October 2013.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.