PowerBridge LLC's affiliate, Hudson Transmission Partners, completed testing of its underground and underwater, 660 MW electric transmission project between Ridgefield, New Jersey and Manhattan, and has begun delivering power to customers in New York City.
The Hudson transmission project route has a total length of about 7.5 miles, with a cable bundle buried under the Hudson River for about 3.5 miles and buried underground for about four miles, starting in Ridgefield, New Jersey.
The line connects to the Con Edison system at the West 49th Street substation in the heart of Manhattan and is capable of providing about five percent of New York City's peak demand. The project began construction in May 2011 at a cost of about $850 million and was completed six weeks ahead of schedule, despite the two hurricanes that hit the area during the construction period.
The Hudson project is the second underwater transmission project completed by PowerBridge, following the 660 MW Neptune undersea transmission project, completed in June of 2007, which extends 65 miles between New Jersey and Long Island. Neptune has supplied about 20 percent of Long Island's electricity needs since going into service. The Hudson and Neptune projects provide access to power from the PJM energy grid, one of the largest and most diverse power markets in the U.S.
Using high voltage direct current technology, the electricity drawn from the PJM grid is converted from AC to DC power, and then back to AC power, at a newly-built converter station in Ridgefield, N.J., for the purpose of maximizing reliability and controllability in delivering power to Manhattan.
Siemens Energy provided the design, engineering, construction and installation of the back-to-back HVDC converter station in Ridgefield, N.J. Siemens will also provide operation and maintenance services for project in conjunction with its operation of Neptune.
Prysmian Cables and Systems USA supplied and installed the about 7.5 miles of 345 kV underwater and underground cable that connects PJM with New York City.
The Hudson cable bundle extends from the PSE&G Bergen substation in Ridgefield, N.J. to the nearby HVDC converter station, and then travels about 3.5 miles underground to Edgewater, N.J. where it enters the Hudson River. The cables make landfall on Manhattan's West Side between Piers 92 and 94, then travels a short distance from W. 52nd Street along the West Side Highway to the Con Edison West 49th Street substation.