Dominion plans new power plant at expanded LNG terminal

The Dominion Cove Point LNG LP unit of Dominion Resources (NYSE: D) is simultaneously pursuing an approval from the Federal Energy Regulatory Commission for a liquefied natural gas (LNG) facility, and a Maryland approval for a 130-MW inside-the-fence power plant to run that expanded facility.

Robert McKinley, Vice President, Generation Construction for Dominion Resources Services, supplied July 17 testimony on both projects at the Maryland Public Service Commission in support of the application for approval of the power plant.

Dominion Cove Point is seeking authorization from FERC to construct, modify, install, own, operate, and maintain the Liquefaction Project. The FERC proceeding covers construction of new facilities in Maryland and Virginia, and expansion of the existing Dominion Cove Point LNG terminal facilities to provide gas liquefaction services for the export of LNG to customers that will provide their own gas supply.

The FERC application was filed on April 1, at the same time as the Maryland PSC application for the power plant.

“The liquefaction facilities proposed in the FERC application, combined with existing facilities, will allow for the bi-directional service of receiving and gasifying imported LNG from LNG vessels, and liquefaction of natural gas for loading onto LNG vessels for export from the Dominion Cove Point LNG terminal,” McKinley wrote. “The permanent facilities that comprise the Liquefaction Project, including the generating station that is the subject of this Application, will be constructed within the fenced area of the 131-acre operating industrial area at the existing LNG terminal in Calvert County, Maryland. The liquefaction facilities will consist of one LNG train expected to have a nameplate capacity (based on 100 percent run-time) of up to 5.75 million metric tons per annum (‘mtpa’) of LNG; new natural gas-fired turbines to mechanically drive the main refrigerant compressors; the generation of additional power on-site to meet the power demands of the Liquefaction Project; and equipment to process the gas stream to remove any impurities that would damage the liquefaction equipment.”

The Liquefaction Project uses state-of-the-art waste heat recovery technology to generate electricity, reflects efficient land use practices, limits its permanent footprint to the existing site, and institutes a zero-discharge system for all process water use.

The construction and operation of these facilities have been authorized by FERC under the Natural Gas Act, including the existing electric generating capacity at the LNG terminal, and the Maryland commission has either previously approved and/or exempted the construction of generating stations at the terminal. All of the power produced at the LNG terminal is used to meet the needs of the terminal. Dominion Cove Point maintains protection equipment on the LNG terminal’s service connection with the local electric company, Southern Maryland Electric Cooperative (SMECO), which prevents electricity from the terminal to flow to SMECO.

In the unlikely circumstance that all on-site generation is non-operational or scheduled maintenance requires use of the connection, then protective circuit breakers could be manually switched to allow power to flow from SMECO. Any such emergency or maintenance service provides only enough power to operate the Administration and Main Control Building loads at the LNG terminal, McKinley noted.

New power plant to use two GE turbines

This new on-site power project includes two steam turbine generators with a nameplate capacity of 65 MW each, for a combined total of 130 MW. The planned generating station is comprised of two heat recovery steam generators (HRSGs) and two auxiliary boilers that will supply steam to the two steam turbines. The HRSGs will recover heat from the exhaust of two General Electric Frame 7 natural gas-fired turbines, which drive the two refrigeration compressor strings along with helper motors.

Both the auxiliary boilers and the HRSGs will have Selective Catalytic Reduction (SCR) systems and carbon monoxide (CO) catalyst with Continuous Emissions Monitoring (CEM).

The proposed generating station will exclusively support the LNG terminal’s electric load consistent with the proposed Dominion Cove Point Liquefaction Project filed with the FERC, and all of the power produced will be consumed at the LNG terminal, McKinley pointed out.

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.