Roslyn Upgrade Project

Project Specifics

This project is complete and is in service as of June 2021.   

PSEG Long Island is committed to delivering best-in-class system reliability by expanding electrical capacity to meet the needs of the communities we serve, today and in the future. PSEG Long Island’s electric grid consists of three primary elements: Electric transmission lines that carry high-voltage power from generation sources; substations that receive the electricity from the transmission lines and step it down to a lower voltage; and distribution lines that carry the lower-voltage electricity into our neighborhoods.

Over the coming months, we will be upgrading the Roslyn Substation east of Willis Avenue, along with connecting distribution infrastructure, in order to meet the growing demand for electricity in your area. While this work is being performed, traffic and parking may be impacted along a portion of the route.

Project Scope
The proposed project consists of several components, including:

  1. Expansion of substation facilities within National Grid-owned property.
  2. Installation of new underground distribution feeder lines
  3. Installation of a temporary 138kV transmission bypass within the substation property to ensure safe, reliable electric service while the improvements are being made. This transmission bypass will be removed once the work is finished (*Please note letter stated 69kV, however correction has been made to the website to reflect correct voltage)
  4. Replacement of overhead distribution poles with poles of similar height and the replacement, removal, and/or installation of pole-top equipment including transformers, switching equipment and electrical wire

Project Timeline

Construction is expected to begin in April 2020 and be fully complete by June 2021.

Substation Work
The substation expansion and upgrades will be completed within the National Grid-owned property located south of the Long Island Expressway and east of Willis Road. The substation, which abuts the Long Island Rail Road tracks to the east, will be expanded approximately 110 feet south into an unutilized portion of the National Grid property. The expansion will allow for approximately 40 feet of buffer space for trees and other vegetation between the new substation fence and the property line. To further integrate the substation expansion into the existing scenery, the new fence will contain green turf slats and additional vegetation will be added to the buffer space between the new fence and the property line. The distribution exit feeders will originate from the substation area and are described in detail in the “distribution” section of this letter. The temporary transmission bypass is described below.

Transmission Work
In order to keep the substation energized and operational during upgrades to substation equipment, a temporary transmission bypass will be installed within the existing Roslyn Substation and expanded substation area. The temporary transmission equipment will be removed when the work is completed; approximately May 2021.

Location of the site or right-of-way
These activities will be conducted within the existing Roslyn Substation and expanded substation area within National Grid-owned property.

Description of the utility transmission facilities to be built
Overhead: The temporary bypass will include the installation of nine poles within the substation property that will be approximately 56 to 61 feet in height, along with overhead cable. The bypass will be removed upon completion of the substation construction activities.

SEQRA Environmental Assessment
To be posted

Why does PSEG Long Island need to perform this work?
Load growth in the area has reached a point where the existing transmission and distribution feeders that serve homes and businesses, are at their maximum capacity. Without needed system upgrades enhancements, load demand during the hot and humid summer days could result in potential service interruptions. This project will reduce the current load of the existing substation equipment and distribution circuits, providing more reliable electric supply to your community. The temporary transmission bypass will allow the substation to remain energized and operational while construction activities are underway.

Alternatives to the project were assessed

  1. The first alternative to this project would be to construct a new, separate substation near the Roslyn Substation to handle some of the electrical load. At this time, no land has been identified, and it would be considerably more economical to expand at the existing substation than to acquire new property and build a new facility.
  2. The second alternative would be to add capacity by upgrading the Manhasset Substation which is less economical project.
  3. The third alternative would be to try to add capacity at the North Hills Substation. This facility may not be able to accommodate such an upgrade. This project is less economical than the Roslyn expansion.

Why is the proposed location best suited for the facility?
Expanding the existing substation and installing additional electrical infrastructure will eliminate the need for a new substation. The current use of the property will remain the same as a substation. The installation of the temporary transmission bypass within the existing Roslyn Substation and expanded substation area is most ideal as the site is currently developed with electrical infrastructure, and it minimizes any impact to the community. The distribution feeders will be installed underground along roadways where utilities already exist and conversion and reconductoring work will be completed along roadways where poles already exist.

Distribution Work
Two distribution exit feeders will be installed from the substation area and extend below surrounding roadways. One will extend westward through the National Grid property and south along Willis Avenue. The second underground feeder will extend east of the substation, along Parkside Drive and north along Roslyn Road.

Conversion and reconductoring activities will be completed along roadways in neighborhoods surrounding the substation where utility infrastructure already exists. Work will include the replacement of approximately 91 existing wood utility poles, ranging in height from 35 to 45 feet along with the installation of approximately 7 new 40 foot wood utility poles. The replacement poles will be the same height or no more than 10 feet taller than the existing poles. These poles will be replaced on the following streets:

  • Mineola Avenue between Wall Bridge Lane and Hillside Avenue
  • Wall Bridge Lane between Mineola Avenue and Old Northern Boulevard
  • Long Island Expressway North Service Road South of Yale Drive
  • Willis Avenue South of Long Island Expressway
  • Mckinley Avenue between Willis Avenue and Chaffee Avenue
  • Grant Avenue between Evans Avenue and Mckinley Avenue
  • Evans Avenue between Grant Avenue and Wentworth Avenue
  • San Juan Avenue between Searingtown Road and Dewey Avenue
  • Searingtown Road south of Dewey Avenue
  • Roslyn Road between Thelma Street and Russel Street
  • Red Ground Road between Kennedy Road and Old Westbury Road
  • Hastings Road between Red Ground Road and Meadowbrook Road
  • Wheatley Road between Trusdale Drive and Applegreen Drive 

MyPower Map

For the latest information regarding project work, please visit the MyPower Map.

SEQRA Environmental Assessment

Frequently Asked Questions

Please see below for frequently asked questions. 

  • Will there be tree trimming?
    Yes, trees growing near power lines significantly increase the chance of power outages and pose safety risks. As we expand and improve our electric circuits, we will trim trees, where necessary, following our utility best practice model (ANSI A300 standards as well as the Best Management Practices Tree Pruning publication): 8 feet to each side; 12 feet above; and 10 feet below the line.
  • Will there be any power outages?
    In the event that a brief outage is required, you will be notified in advance.
  • Will there be any traffic interruptions?
    There will be minor traffic disruptions along the route. To ensure traffic moves safely, PSEG Long Island will provide cones, flagmen and signage at the work sites, as needed.
  • How can I get more information or leave feedback?
    If you have further questions, please call PSEG Long Island Customer Service at 1-800-490-0025 between 8 a.m. and 8 p.m. If you would like to share comments on the project, please email:

As always, customer and employee safety is our primary concern. Please be cautious when travelling near our construction work zones.  

POSTED DATE: 03/06/20



Frequently Asked Questions
Frequently Asked Questions