The Neptune Cable is a 500kV and 660 MW[1] high-voltage direct current submarine power cable between the Red Oak Power station Sayreville, New Jersey and New Cassel, New York, on Long Island.

The cable is managed by Fairfield, Connecticut-based PowerBridge, LLC.

[1] The power plant was developed as part of a 2003 request for proposal from the Long Island Power Authority for new generating plants on Long Island[4] that was a response to the Northeast blackout of 2003 and delays by Connecticut in activating the Cross Sound Cable,[5] and due to continued high peak demand over multiple years.

[6][7] This solicitation also resulted in construction of the Caithness Long Island Energy Center; Bethpage Energy Center; and Pinelawn Power Plant in West Babylon, New York.

[7] The cable was constructed following the Long Island Power Authority's determination that importing electricity would make more sense economically than constructing new power generating stations on Long Island.