Y-49 Cable

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Y-49 Cable
Long Island Sound Cable
CountryUnited States
StateNew York
FromYonkers, New York
ToUniondale, New York
Ownership information
OwnerNew York Power Authority
Technical information
Total length26 mi (42 km)

The Y-49 Cable (also known as the Long Island Sound Cable) is an undersea and underground high voltage electric transmission cable between Westchester County and Long Island via the Long Island Sound and Hempstead Harbor in New York, United States. It is operated by the New York Power Authority.


The Y-49 Cable travels between the Sprain Brook Substation in Yonkers, Westchester County (operated by Consolidated Edison) to the East Garden City Substation in Uniondale, Nassau County (operated by NYPA).[1][2] It travels under the Long Island Sound between Westchester County and Long Island; this undersea section is roughly 8 miles (13 km) in length (the entire line is roughly 26 miles (42 km) long).[3][1][4] The average depth of the undersea section is 10–15 feet (3.0–4.6 m) below the Long Island Sound's seabed.[1]

Y-49 is one of five undersea transmission lines connecting between Long Island and the Continental United States as of 2021 (four of which are operated by NYPA).[5]


The cable began operating in May 1991, and has a capacity of 675 megawatts.[1][4]

In 2014, the cable was damaged by an anchor from a boat.[6][7][8] The incident caused roughly 66,000 gallons of cable insulation fluid to be released into Hempstead Harbor.

As of 2021, there are proposals to upgrade the cable in order to increase its capacity.[4]

See also[edit]


  1. ^ a b c d "Long Island Sound Cable Repair". www.nypa.gov. Retrieved 2021-08-21.
  2. ^ "Long Island Sound Cable-Y49 Line Relay and Annunciator Upgrades | BidNet". www.bidnet.com. Retrieved 2021-08-21.
  3. ^ "Long Island Power Line Fails, Conservation Urged". www.ecmweb.com. 2002-05-30. Retrieved 2021-08-21.{{cite web}}: CS1 maint: url-status (link)
  4. ^ a b c Harrington, Mark (2021-05-21). "More grid upgrade costs for LIPA ratepayers?". Newsday. Retrieved 2021-08-21.
  5. ^ Harrington, Mark (2021-09-21). "1 failed power cable restored, another may be by mid-October, power authorities say". Newsday. Retrieved 2022-03-23.
  6. ^ "Y-49 Submarine Cable Location & Burial Depth". W.J. Castle, P.E. & Associates, P.C. 2015-08-18. Retrieved 2021-08-21.
  7. ^ "New York Power Authority | Vesper Guardian Asset Protection". Retrieved 2021-08-21.
  8. ^ "Hempstead Harbor Leak Update 2.19". northwordnews. Retrieved 2021-08-21.