• Cape Cod Canal Pipeline Relocation Project
FERC Docket PF25-4 and being reviewed by MEPA, EEA No. 16947
Algonquin Gas Transmission Co., LLC (AGT) is a division of Enbridge.
This project is a reconfiguration of gas transmission pipeline infrastructure crossing the Cape Cod Canal. Currently National Grid, the local gas company, has two mains on the Sagamore and Bourne bridges which MassDOT says have to go as they replace the bridges. So they are replacing two currently bridge-mounted National Grid 10” 270psi mains with one 2.2mi 18” 750 MAOP (maximum allowable operating pressure) HHD pipe under the Canal and 3.5mi 16” MAOP to the two new meter stations.
» See Sierra Club’s June 17th webinar on this project
» FERC document list for this docket
» Download project Resource Reports (compiled into one file)
Given the state’s mandated goals to reach net zero emission by 2050, it should have been a re-design of the existing system at no more than its current capacity. But, as is frequently the case, this proposal has a notable increase in capacity, replacing 10” diameter pipe with 16” and 18”.
“removal of approximately .75 mile of existing pipeline, installation of four greenfield M&Rs, removal/abandonment of two existing M&Rs, and installation of approximately 5.7 miles of greenfield pipeline.” (Source)
It also includes two new metering stations in addition to replacement of the two already existing stations, and new “pig launchers/receivers” for both pipeline segments.
While this project does have to happen if Cape Cod customers want to continue to get gas, the project should not allow for an increase in capacity that could allow them to expand the local gas companies’ customer base. Contracts for expansion of gas use have not been submitted for approval by the Mass. Department of Public Utilities.
COMMENT PERIODS / ACTIONS:
Comment period on the DEIR closed on March 6, 2026.
Resource Reports were released and we’re finding key data still missing, like “TBD” entered in emissions tables.
» Download resource reports from FERC docket PF25-4
» Our key observations about the resource reports