PowerBridge's affiliate Hudson Transmission Partners (HTP) said its 660MW underground and underwater electric transmission line running between Ridgefield, New Jersey and Manhattan, New York has begun operations.

The $850m high-voltage direct current project, which connects to the Con Edison system at the West 49th St. substation in Manhattan, is capable of providing about 5% of New York City’s peak electric demand.

The total length of the line is about 7.5 miles, with a cable bundle buried under the Hudson River for about 3.5 miles and underground for about four miles, starting in Ridgefield.

New York Power Authority will buy the electricity from New Jersey over the Hudson line to serve the utility’s customers in the New York City.

The Hudson project is the second underwater transmission project completed by PowerBridge, following the 660MW Neptune undersea transmission project, which was completed in 2007.

Neptune project extends 65 miles between New Jersey and Long Island, supplying about 20% of Long Island’s electricity needs after it commenced operations.

Both the projects provide access to power from the PJM energy grid, which serves about 60 million people in 13 states and the District of Columbia.

Prysmian Cables and Systems manufactured and installed the power cables for the Hudson transmission project, while Siemens provided the converter station technology.

Siemens will also provide operation and maintenance services for project in conjunction with its operation of Neptune.