ISO New England files interconnect for Exelon’s 207-MW West Medway expansion

ISO New England and interconnecting transmission owner NSTAR Electric on June 27 filed with the Federal Energy Regulatory Commission an executed non-conforming Standard Large Generator Interconnection Agreement with Exelon West Medway II LLC for a planned expansion of a gas-fired power plant in Massachusetts. 

The deal governs the interconnection of this new capacity at NSTAR’s 115-kV Medway Station. This new acility will be comprised of two new simple cycle combustion turbine generators (CTG), designated CTG1 and CTG2, each rated at 103.467 MW, and located in the Town of Medway, Mass. Each CTG will be connecting to one low-voltage winding of a new three-winding generator step-up transformer (GSU).

This new facility is located at a site adjacent to an existing power plant, which is known as Unit J-3 and is interconnected pursuant to a separate qgreement between NSTAR and West Medway, dated as of December 1997. While this new facility is separate from and does not include West Medway’s existing facility, it will be interconnecting to NSTAR’s 115 kV-Medway Station through shared facilities.

The commercial operation target date for this new generating facility, under the agreement, is April 17, 2018.

The project company is a subsidiary of Exelon (NYSE: EXC). The project would operate during times of peak energy demand and would run primarily on natural gas, but could also run on ultra-low-sulfur diesel (ULSD) fuel oil, ensuring fuel diversity and reliability. The project will utilize two simple-cycle General Electric LMS100 combustion turbine generators.

The project will occupy a 13-acre site within a larger 94-acre Exelon-owned property on Route 126 in Medway. The property has been used for power generation and electrical infrastructure for more than 50 years. The natural gas connection will be to the Spectra/Algonquin  unterstate gas pipeline which runs along the western edge of the Exelon property.

Also on June 27, Exelon West Medway LLC lodged with FERC a Shared Interconnection Facilities Agreement (SIFA) between West Medway and its affiliate, Exelon West Medway II. West Medway owns an approximately 42 MW electric generation facility (Jet 3) located in Massachusetts and the ISO New England balancing authority area. The commission has granted West Medway market-based rate authority.

West Medway II is developing and will own and operate a separately metered, approximately 207-MW generation facility (West Medway II Project) at a site adjacent to Jet 3. It is currently anticipated that production of test power from the West Medway II Project will begin in December 2017 and the West Medway II Project’s commercial operation is expected to occur in April 2018.

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.