Gemma gets limited notice to proceed on 200-MW Medway II project in Massachusetts

Gemma Power Systems LLC said Aug. 5 that it has received a Limited Notice to Proceed (LNTP) to commence activities under a Turnkey Engineering, Procurement and Construction Contract with Exelon West Medway II LLC for a 200 MW dual-fuel simple cycle plant in Medway, Massachusetts.

The Full Notice to Proceed (FNTP) is contingent upon Exelon receiving all Massachusetts regulatory approvals for the project. The contract value is approximately $100 million.

Exelon West Medway II is a wholly-owned subsidiary of Exelon Generation Co. LLC and Exelon Corp. (NYSE: EXC). Exelon had announced this project on Feb. 5.

The new facility will be constructed on a 70-acre site adjacent to Exelon’s existing 173-MW Medway Generating Station and will feature two 100-MW General Electric LMS100 combustion turbine generators. Construction and commissioning is planned to be complete in the second quarter of 2018.

“Exelon is a new customer for us and we’re gratified with the confidence they have shown in us to construct this essential power facility for them,” said William F. Griffin Jr., Chief Executive Officer of Gemma Power Systems. “We look forward to this new partnership, adding to our LMS100 resume and demonstrating the reputation we have built over the past 18 years.”

Gemma Power Systems, a wholly owned subsidiary of Argan Inc. (NYSE: AGX), is a leading Engineering, Procurement and Construction (EPC) company. Its wide-ranging and comprehensive experience includes 11,000 MW of installed capacity including combined cycle and simple cycle gas turbine generating plants, biomass, solar facilities, wind farms, biofuel plants and environmental facilities.

State agencies have been reviewing this project

A state public notice issued ahead of a June 11 hearing on the project said: “Notice is hereby given that pursuant to G.L. c. 164, § 69J¼, Exelon West Medway, LLC and Exelon West Medway II, LLC (collectively “Exelon” or the “Company”), 300 Exelon Way, Kennett Square, Pennsylvania 19348, has filed with the Energy Facilities Siting Board (the “Siting Board”) a Petition for approval to construct a new electric power plant capable of generating 200 megawatts (“MW”) of electricity (the “proposed Generating Facility” or “Facility”) in the town of Medway, Massachusetts. Exelon has also filed a Petition with the Department of Public Utilities, pursuant to G.L. c. 40A, § 3, seeking certain zoning exemptions from the Town of Medway Zoning Bylaw for the proposed Generating Facility (together, the “Petitions”).

“The proposed Generating Facility would be located on an approximately 10-acre site (the “Facility Site”) within the larger 94-acre site on Summer Street in Medway on which the existing Exelon West Medway, LLC power plant is located (the “Summer Street Site”). Exelon West Medway II, LLC would own and operate the proposed Generating Facility; it anticipates that the proposed Generating Facility would begin commercial operation in June 2018.”

The notice said this facility would be a dual-fuel (natural gas and ultra low sulfur distillate (ULSD) oil (0.005% sulfur)), simple-cycle, quick-start power plant capable of generating 200 MW (nominal). It would include two GE LMS100 simple-cycle peaking combustion turbines (CTGs), each with a net nominal output of 100 MW. Each turbine would have an associated inlet air filter; an intercooler; a vent stack for the intercooler; air cooled heat exchangers for the intercooler and lube oil; a Selective Catalytic Reduction (SCR) module with ammonia injection skid; oxidation catalyst modules; an exhaust stack; and, a three-winding main generator step-up (GSU) transformer. The exhaust stacks for the facility would be 160 feet above grade.

Additional equipment would include a single building housing the control room; a maintenance and warehouse area; a trailer-mounted demineralizer system; an enclosed gas compressor station with adjacent gas yard; a 1,000,000-gallon ULSD fuel-oil tank; a 500,000- gallon fire/service water tank; a 450,000-gallon demineralized water storage tank; a 50,000- gallon wastewater tank; and a 16,000-gallon diked and covered aqueous ammonia storage tank.

Natural gas will be delivered via an interconnection to the Algonquin Gas Transmission Co. pipeline and would be constructed by either Exelon or Spectra Energy. Exelon has identified a proposed pipeline route for the new 300-750 psig, 12-inch diameter pipe, which will be installed underground. The total length of the proposed pipeline route is approximately 3,000 feet.

The facility would interconnect to the southeast with an existing switchyard (Station #65) on the 94-acre Summer Street Site, owned and operated by Eversource. To effect this interconnection, Exelon would construct and run one approximately 1,200-foot three-phase 115-kV overhead circuit from the facility to the switchyard. Eversource proposes to distribute electric power generated by the proposed facility through the switchyard into its bulk transmission system.

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.