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.
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).
[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).
[6][7][8] The incident caused roughly 66,000 gallons of cable insulation fluid to be released into Hempstead Harbor.