News & Events
- 2025
EM&CP Filing
October 3, 2025
PSEG Long Island LLC on behalf of and as agent for the Long Island Lighting Company d/b/a LIPA, a wholly-owned subsidiary of the Long Island Power Authority, filed a proposed Environmental Management and Construction Plan ("EM&CP”) with the New York Public Service Commission. The project proposed in the EM&CP consists of the design and construction of a new, 138 kV underground transmission line of approximately 4.5 miles, to be operated initially at 69 kV, between the Southampton Substation and the Deerfield Substation, in the Village and Town of Southampton, Suffolk County. The Project is driven by a requirement to address North American Electric Reliability Corporation ("NERC”) transmission planning ("TPL”) reliability standards. The addition of a second transmission line from Southampton Substation to Deerfield Substation would reinforce LIPA’s electric transmission system on the South Fork and improve reliability of service to LIPA’s customers.
http://southampton2deerfield.com/assets/document-library/EMCPPublicNoticeFiling.pdf
Virtual Public Information Session Materials
About the Project
Project Overview and Benefits
PSEG Long Island, as the agent of LIPA, is proposing a new underground electric transmission project to increase the load capacity and reliability of the electric transmission system on Long Island. Called the Southampton to Deerfield Transmission Project ("SHDF Project" or "Project"), its principal component is the installation of a new underground 138 kilovolt (kV) transmission line between the existing Southampton Substation (located in the Village of Southampton at the intersection of North Sea Road and West Prospect Street) and the existing Deerfield Substation (located in the Hamlet of Watermill on Water Mill Towd Road) primarily along roadways and existing municipal rights-of-way. The SHDF Project is the most cost-effective solution to meet the South Fork's increasing electrical demand and need for reliable electrical service while minimizing disruptions to the community. The Project also is consistent with and furthers the goals of the New York's Climate Leadership and Community Protection Act by supporting the transmission of wind energy on Long Island.
Benefits Include:
The new 138kV electric transmission cable will help ensure continued reliable service to the East End of Long Island. With the South Fork load continually growing, the proposed 138kV supply circuit from the Southampton Substation to the Deerfield Substation will enhance reliability and add redundancy to the existing transmission system.
The new 138kV cable will be located entirely underground except for certain above-ground electrical equipment within the existing substations.
The Project will be located primarily under roads and other public rights-of-way.
Construction of the Project will occur with the least amount of impact to residents and travelers in the area. Throughout construction, access to businesses and residences along the Project route will be maintained.
Permitting & Consultation Process
To construct the Project, PSEG Long Island will need, in addition to other necessary permits:
- The New York State Public Service Commission's issuance of an Article VII Certificate of Environmental Compatibility and Public Need and approval of an Environment Management & Construction Plan (EM&CP).
- Approval from or consultation with the New York Department of Environmental Conservation, New York State DOT, and New York State Office of Parks, Recreation & Historic Preservation.
- Consultation with Suffolk County, Town of Southampton, and Village of Southampton.
New York State Public Service Commission Article VII and EM&CP Information
The Project's Public Service Law Article VII application and related documents in this case (Case 24-T-0113) can be accessed from the PSC's website (www.dps.ny.gov). Click "Commission File" and then "'File Search” to go to the Search page, then fill in the "Search by Case Number” box with the number for this case (24-T-0113). This will bring up the main Document and Matter Management ("DMM”) page(s) for this case, where the materials are located.
In addition, interested persons who wish to participate as parties in this case may file for party status. On the DMM page for this case, the prospective party should click the button at the upper right labeled "Request for Party Status” to see a PSC web page with instructions for the procedures to follow to become a party.
Document Library
- EMCP Filing Public Notification - 10/03/2025 -
- SHDF EMCP Filing Letter - 10/03/2025 -
- 01 SHDF EM&CP Narrative - 10/03/2025 -
- EM&CP 02_Appendix A - Plan & Profile Drawings Part 1 of 5 - 10/03/2025 -
- EM&CP 03_Appendix A - Plan & Profile Drawings Part 2 of 5 - 10/03/2025 - 19.86 MB
- EM&CP 04_Appendix A - Plan & Profile Drawings Part 3 of 5 - 10/03/2025 - 23.22 MB
- EM&CP 05_Appendix A - Plan & Profile Drawings Part 4 of 5 - 10/03/2025 - 22.99 MB
- EM&CP 06_Appendix A - Plan & Profile Drawings Part 5 of 5 - 10/03/2025 - 23.90 MB
- EM&CP 07_Appendix B - Stormwater Pollution Prevention Plan 1 of 4 - 10/03/2025 - 21.59 MB
- EM&CP 08_Appendix B - Stormwater Pollution Prevention Plan 2 of 4_REDACTED - 10/03/2025 - 12.79 MB
- EM&CP 09_Appendix B - Stormwater Pollution Prevention Plan 3 of 4 - 10/03/2025 - 4.75 MB
- EM&CP 10_Appendix B - Stormwater Pollution Prevention Plan, 4 of 4 - 10/03/2025 - 8.11 MB
- EM&CP 11_Appendix C - Emergency Response Plan - 10/03/2025 - 536 KB
- EM&CP 12_Appendix D - Complaint Management and Resolution - 10/03/2025 - 270 KB
- EM&CP 13_Appendix E - Cultural Resources Avoidance Minimization Mitigation Plan - 10/03/2025 - 1.23 MB
- EM&CP 14_Appendix F - Construction Noise Control Plan - 10/03/2025 - 272 KB
- EM&CP 15_Appendix G - Drainage System Repair Plan - 10/03/2025 - 326 KB
- EM&CP 16_Appendix H - Dewatering Plan - 10/03/2025 - 281 KB
- EM&CP 17_Appendix I - Highway Work Plan - 10/03/2025 - 149 KB
- EM&CP 18_Appendix J - Maintenance and Protection of Traffic Plan - 10/03/2025 - 10.18 MB
- EM&CP 19_Appendix K - Threatened and Endangered Minimization and Monitoring Plan - 10/03/2025 - 2.39 MB
- EM&CP 20_Appendix L - Wetland Mitigation Plan - 10/03/2025 - 133 KB
- EM&CP 21_Appendix M - Stream Crossing Plan - 10/03/2025 - 133 KB
- EM&CP 22_Appendix N - Inadvertent Returns Plan - 10/03/2025 - 133 KB
- EM&CP 23_Appendix O - Quality Control Plan - 10/03/2025 - 176 KB
- EM&CP 24_Appendix P - Invasive Species Management Plan_Part 1 of 2 - 10/03/2025 - 13.58 MB
- EM&CP 25_Appendix P - Invasive Species Management Plan_Part 2 of 2 - 10/03/2025 - 17.21 MB
- EM&CP 26_Appendix Q - Long-Range ROW Management Plan - 10/03/2025 -
- EM&CP 27_Appendix R - Spill Prevention Control and Countermeasures Plan - 10/03/2025 - 174 KB
- EM&CP 28_Appendix S - Final Geotechnical Engineering Report - 10/03/2025 - 11.94 MB
- EM&CP 29_Appendix T - Public Involvement Plan - 10/03/2025 - 2.98 MB
- EM&CP 30_Appendix U - Vegetation and Tree Management and Restoration Plans_REDACTED - 10/03/2025 - 425 KB
- EM&CP 31_Appendix V - EMF Certification - 10/03/2025 - 1.91 MB
- EM&CP 32_Appendix W - Permits and Approvals_REDACTED - 10/03/2025 -
- EM&CP 33_Appendix X - Additional Procedures and Forms - 10/03/2025 -
- 09 - Exhibit 3 (SHDF) Alternatives w Figs - 02/16/2024 -
- 04 - Motion for Waivers (SHDF) - 02/16/2024 -
- 05 - Application (SHDF) - 02/16/2024 -
- 06 - Exhibit 1 (SHDF) General Information Regarding Application - 02/16/2024 -
- 07 - Exhibit 2 (SHDF) Location of Facility (w Figs except 2-3) REDACTED - 02/16/2024 -
- 08 - Exhibit 2 Figure 2-3 (SHDF) Aerial Location of Facility - 02/16/2024 -
- Notice of Public Information Forums and Public Statement Hearings, and Soliciting Public Comments - 09/26/2024 -
- 01 - Filing Letter (SHDF) 2-16-24 - 02/16/2024 -
- 02 - Table of Contents (SHDF) - 02/16/2024 -
- 03 - Master Glossary of Terms (SHDF) - 02/16/2024 -
- Anticipated Project Timeline as of October 2024 - 10/02/2024 -
- Primary Route Maps - 10/02/2024 -
- Proyecto de transmission de Southampton a Deerfield - 10/02/2024 -
- Southampton to Deerfield Transmission Project - Fact Sheet - 10/02/2024 -
- 11 - Exhibit 4 Figures 4.7-2 to 4.8-1 (SHDF) - 02/16/2024 -
- Article VII Pre-Filing abutting landowner Letter - 12/30/2024 -
- 12 - Exhibit 5 (SHDF) Design Drawings w Figs - 02/16/2024 -
- 13 - Exhibit 6 (SHDF) Economic Effects of Proposed Facility - 02/16/2024 -
- 14 - Exhibit 7 (SHDF) Local Ordinances w Figs - 02/16/2024 -
- 15 - Exhibit 8 (SHDF) Other Pending Filings - 02/16/2024 -
- 16 - Exhibit 9 (SHDF) Cost of Proposed Facility REDACTED - 02/16/2024 -
- 17 - Exhibit E-1 (SHDF) Description of Proposed Transmission Facilities w Figs - 02/16/2024 -
- 18 - Exhibit E-2 (SHDF) Other Facilities w Figs REDACTED - 02/16/2024 -
- 19 - Exhibit E-3 (SHDF) Underground Construction w Figs - 02/16/2024 -
- 20 - Exhibit E-4 (SHDF) Engineering Justification w Fig + Att REDACTED - 02/16/2024 -
- 21 - Exhibit E-5 (SHDF) Effect on Communications w Fig - 02/16/2024 -
- 22 - Exhibit E-6 (SHDF) Effect on Transportation w Fig - 02/16/2024 -
- 23 - Appendix A (SHDF) Pre-filed Direct Testimony - 02/16/2024 -
- 24 - Appendix B (SHDF) Agency Correspondence - 02/16/2024 -
- 25 - Appendix C (SHDF) Public Outreach w Atts - 02/16/2024 -
- 26 - Appendix D (SHDF) EMF Study - 02/16/2024 -
- 27 - Confidentiality Request Ltr (SHDF) - 02/16/2024 -
- 28 - Draft SAPA Notice (SHDF) - 02/16/2024 -
- Notice of Impending Settlement Negotiations - 09/26/2024 -
- 10 - Exhibit 4 (SHDF) Environmental Impacts w Figures 4.2-1 to 4.7-1 - 02/16/2024 -
- Routing Methodology - 12/06/2023 -
- Article VII Application: Public Notice - 02/07/2024 -
- Project Description & Route - 10/02/2024 -
- Aerial of Deerfield Substation - 11/15/2023 -
- Aerial of Southampton Substation - 11/15/2023 -
- Overview of Southampton to Deerfield Routing Options - 11/15/2023 -
- Proposed Route Map - 09/10/2024 -
- Article VII Fact Sheet - 11/15/2023 -
- Construction Boards - 12/06/2023 -
- Project Description - 12/06/2023 -
Construction Process
Underground Transmission Construction Process Overview
Construction of the Project will occur primarily along North Sea Road, Willow Street, North Main Street, North Sea Mecox Road, David Whites Lane, Edge of Woods Road, and Water Mill Towd Road in the Town of Southampton, thus minimizing impacts to residents and travelers to the area.
Underground Construction Involves Five Key Phases
Splice Vaults Installation
Underground vaults will be installed at intervals along the route to splice together underground cable.
Conduit Installation
During the installation process, crews will route the new conduits to the new splice vaults.
Restoration
After completing the installation of the vaults, any excavated and disturbed areas will be restored.
Cable Installation
Underground cable arrives on trucks specifically designed for their installation. Crews will pull cable from one vault to another along the project route.
Cable Splicing
Crews will set up a climate-controlled environment at each vault location to splice the underground cables together. This activity is continuous for approximately one week for each vault.