National Grid to repower, up capacity of Barrett plant on Long Island

National Grid filed an Oct. 4 application with the New York State Public Service Commission proposing to repower its E. F. Barrett Power Station in Nassau County, N.Y.

The existing Barrett Station currently consists of two baseload steam units, each capable of generating up to 185 MW, and two separate blocks of simple cycle peaking units with a combined capacity of up to 280 MW. The proposed repowering will consist of either: the development of a new combined cycle unit: or a new combined cycle unit and new simple cycle units followed by the decommissioning of the units replaced.

National Grid’s E.F. Barrett property is located on Barnum’s Channel at McCarthy Road and 4005 Daly Boulevard, in the Town of Hempstead, New York, immediately adjacent to the incorporated Village of Island Park.

The station’s main operating equipment, the two steam electric units (Units 1 and 2) with a combined capacity of up to 370 MW, were placed in-service in 1956 and 1963, respectively. The northern portion of the site is developed with gas turbines (GTs), including eight General Electric Frame units (combined capacity of 120 MW) and four Pratt & Whitney aero-derivative twin-pack gas turbines (combined capacity of 160 MW) that were placed in service in 1970 and 1971, respectively.

A dock facility located on Barnums Channel allows barges to unload No. 6 fuel oil to an on-site fuel tank farm.

National Grid and the Long Island Power Authority (LIPA) are currently evaluating potential redevelopment scenarios for the repowering of Barrett. The following repowering options are currently under consideration:

  • Development of a new 560 MW-650 MW combined cycle facility;
  • Development of a new 560 MW-650 MW combined cycle facility and up to 330 MW of 
additional simple cycle combustion turbine peaking capacity at the station.

In addition to the above, LIPA may choose not to exercise its option under an Amended Agreement to collaboratively seek the repowering of Barrett. Total future generation at the repowered site will not exceed 940 MW, National Grid said.

More details on the options are:

Combined Cycle Development – A new 550 MW-650 MW combined cycle electric generating facility is being considered as part of the contemplated Barrett Station repowering. The proposed facility design will include the following:

  • 2×1 configuration utilizing two Class F Technology Combustion Turbine Generators (CTGs) and one steam turbine generator (STG), with the combustion turbine technologies currently being evaluated including GE, Siemens, and Mitsubishi frame turbines.
  • Natural gas will be utilized as the primary fuel with provisions to use low sulfur distillate fuel oil for up to 30 days as a back-up fuel;
  • To accommodate short-term operation on distillate oil, the proposed combined cycle facility would include a minimum of 5-days of on-site fuel oil storage;
  • Air-cooled condensers (ACC) to minimize water usage;
  • Selective catalytic reduction technology (SCR) and an oxidation catalyst to control NOx and carbon monoxide (CO) emissions, respectively.

Simple Cycle Development – In addition to any new combined cycle facility, National Grid and LIPA may also opt to install up to six simple cycle peakers at the site to generate up to an additional 330 MW to meet peak electrical demands in the region. The proposed simple cycle facility design will include:

  • Installation of four or six simple cycle turbines capable of generating 40 MW-60 MW each. Simple cycle turbine models under consideration include GE LM6000, Pratt and Whitney Twin Pack, and Rolls Royce Trent 60;
  • Natural gas will be utilized as the primary fuel with provisions to use low sulfur distillate fuel oil for up to 30 days as a back-up fuel;
  • Similar to the combined cycle facility, to accommodate short-term operation on distillate oil, the proposed simple cycle facility would include a minimum of 5-days of on-site fuel oil storage; and
  • SCR technology and an oxidation catalyst to control NOx and CO emissions, respectively.

Should National Grid propose a development plan that includes both combined cycle and simple cycle turbines, it is anticipated that certain facilities will be common to both turbine developments (e.g., demineralized water treatment and storage, gas metering, etc.). The new generation facility/facilities would interconnect with LIPA’s 138-kV transmission system at LIPA’s E.F. Barrett Substation, which is located on-site.

National Grid is proposing a phased development approach. Following receipt of needed approvals, currently targeted for February 2015, construction would start on any proposed simple cycle turbines, which would have a targeted commercial operation date of Summer 2017. The targeted commercial operation date for the combined cycle unit is Summer 2019. Following commercial operation of the new combined cycle unit, National Grid would decommission the site’s existing steam generating units and simple cycle turbines.

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.