National Grid on Dec. 3 filed with the New York State Public Service Commission some revisions to its Oct. 4 application for approval of a repowering of its gas-fired E.F. Barrett Power Station.
The Dec. 3 filing was in response to a letter dated Nov. 4 in which the commission provided comments on the National Grid’s proposed Public Involvement Program (PIP) Plan that was submitted on Oct. 4.
National Grid is seeking to repower this plant, located in the Town of Hempstead, Nassau County. The existing station consists of two baseload steam generating 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 units replaced.
The proposed project is associated with the “Amended and Restated Power Supply Agreement” by and between the Long Island Power Authority (LIPA) and National Grid, effective May 2013. The amended agreement allows LIPA to continue to purchase power from National Grid’s existing Long Island stations in order to meet the electricity needs of its customers and locational capacity requirements established by the New York State Independent System Operator and the New York State Reliability Council. The amended agreement also requires National Grid to prepare a proposal for repowering of Barrett as a new energy center. This will allow LIPA the opportunity to strategically and selectively remove or replace existing generation in an orderly fashion.
This proposed repowering will be evaluated by LIPA against its future and anticipated generation capacity needs. Under its current contract, National Grid said it will propose repowering options at the facility for LIPA’s consideration. This current licensing effort is in conjunction with submittal of National Grid’s proposal to LIPA for the planned repowering, which is anticipated to be submitted to LIPA in early 2014. It is expected that LIPA will make a decision on the project in the fall of 2014.
National Grid’s approximately 127-acre E.F. Barrett Power Station 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. Its main operating equipment includes two steam electric units (Units 1 and 2) with a combined generating capacity of up to 370 MW that 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.
Project could include both baseload and peaking elements
National Grid and LIPA are currently evaluating two potential repowering scenarios to have a maximum future generation capacity of about 940 MW:
- Development of a new 560 MW-650 MW combined cycle unit; or
- Development of a new 560 MW-650 MW combined cycle unit and up to 330 MW of additional simple cycle (peaking) units.
In addition to the above, LIPA may choose not to exercise its option under the Amended Agreement to collaboratively seek the repowering of Barrett Station.
The proposed combined cycle facility design includes the following:
- 2×1 configuration utilizing 2 Class F Technology Combustion Turbine Generators (CTGs) and one steam turbine generator (STG). The combustion turbine technologies currently being evaluated include General Electric, Siemens and Mitsubishi frame turbines;
- Natural gas will be utilized as the primary fuel with provisions to use ultra-low sulfur distillate (ULSD) 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 five 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.
The proposed simple cycle facility design includes:
- Installation of four or six simple cycle turbines capable of generating 40 MW-60 MW of power 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 ULSD 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 five days of on-site fuel oil storage; and
- SCR technology and an oxidation catalyst to control NOx and CO emissions, respectively.
The total future generation at the site will not exceed 940 MW. 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.
Following receipt of the Article 10 Certificate and associated environmental permits and approvals (currently targeted for February 2015), construction would first commence on any proposed simple cycle turbines, which are targeted for commercial operation in summer 2017. Targeted commercial operation for the combined cycle unit is summer 2019. Following commercial operation of the combined cycle unit, National Grid would decommission the site’s existing steam generating units and simple cycle turbines.