The Y-50 Cable (also known as the Dunwoodie–Glenwood Line) 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-50 Cable travels between the Dunwoodie Substation in Yonkers, Westchester County to the Glenwood Generating Station in Glenwood Landing, Nassau County.
The line between Dunwoodie and the Glenwood Generating station is approximately 17.4 miles (28.0 km) – or roughly 91,000 feet (28,000 m).
[1] Y-50 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).
[3][4] In 2002, the cable experienced a fault that caused a month-and-a-half interruption, after which the operators lowered its usage from its 600 MW capacity down to 400 MW for a few months.