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News & Events

2026
2025

Notice of Intent to Start Construction

Notice of Intent to Commence Work for the Southampton to Deerfield Transmission Project on or about January 20th, 2026. Please find the full NOI here

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

Permitting & Consultation Process

New York State Public Service Commission Article VII and EM&CP Information

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 - 10/20/2025 - 53.00 MB
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 - 12/08/2025 - 24 KB
Primary Route Maps - 10/02/2024 -
Proyecto de transmission de Southampton a Deerfield - 09/01/2025 - 518 KB
Southampton to Deerfield Transmission Project - Fact Sheet - 09/01/2025 - 518 KB
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 Route - 12/08/2025 - 13.43 MB
Certified Route Map - 12/08/2025 -
Article VII Fact Sheet - 11/15/2023 -
SHDF Construction NOI - 01/02/2026 - 360 KB
Construction Boards - 12/06/2023 -
Project Description - 12/06/2023 -
PSEG_SHDF_Update_to_EMCP - 12/03/2025 - 201 KB
EM&CP_Narrative_REVISED_redline_final - 12/03/2025 - 1.13 MB
Appendix_A_P&P_REVISED_SHEETS_OCRd2 - 12/03/2025 - 1.72 MB
Appendix_Q_Long-Range_ROW_Management_Plan_REVISED_redline - 12/03/2025 - 305 KB
Appendix_U_VTMRP_REVISED_redline - 12/03/2025 - 708 KB

Construction Process

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Contact Us

T: 631-237-7196
E: info@southampton2deerfield.com

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Permitting the Southampton to Deerfield Project

See "About the Project" to learn more about the need for the Southampton to Deerfield Project, and the New York State Public Service Commission process.

Construction To Begin Soon!

The Project intends to commence work on or about January 20th, 2026. Read about how the construction process for a new underground transmission line happens.