“The settlement will remedy the Clean Water Act and River and Harbors Act permit violations,” said Acting Assistant Attorney General Jeffrey H. Wood for the Justice Department’s Environment and Natural Resources Division.

The cable, installed in 1990, extends from an NSTAR electrical substation in South Boston to Deer Island. Its purpose was to provide electricity to power the construction and operation of the Deer Island Waste Water Treatment Plant, which is run by the MWRA. The permit required the cable to be embedded at least 25 feet below the bottom of two shipping channels that it crosses, the Reserved Channel and the Main Ship Channel.

The improper installation of the cable took on urgency in 2014, when Congress authorized the deepening of Boston Harbor, including the channels crossed by the cable. The $310 million project to deepen the shipping channels will provide increased depth between Massachusetts Bay and Conley Container Terminal to accommodate the new generation of larger container ships.

The harbor deepening project, known as the Deep Draft project, is being led by the USACE in partnership with Massport, which operates Conley Container Terminal. USACE determined that the existing depth of the cable was likely to interfere with the dredging operations of the Deep Draft project, putting the entire project at risk.

William D. Weinreb, Acting United States Attorney for the District of Massachusetts, noted that this settlement will still allow the Deep Draft project to proceed as planned, as it is critical to keeping Boston Harbor clean and competitive with other East Coast ports.

The government’s complaint alleged that the permittees – NSTAR, HEEC, and the MWRA – violated two federal laws under which the permit was issued, the Rivers and Harbors Act of 1899 and the Clean Water Act. Massport intervened in the lawsuit, siding with the United States.


Under the terms of the settlement, HEEC will lay a new electrical cable across Boston Harbor from South Boston to Deer Island – but outside the Reserved Channel and out of the way of the Deep Draft project – by the end of 2019. HEEC will then remove the existing cable. Neither the United States nor Massport will bear any of the cost to install or maintain the new cable or remove the existing cable.