Algonquin plans twin HDD crossings under Cape Cod Canal in Mass.
By Mary Holcomb, Lead Digital Editor
(UI) — Enbridge’s Algonquin Gas Transmission is preparing for one of Massachusetts’ most technically demanding trenchless installations—twin horizontal directional drills (HDDs) under the Cape Cod Canal—as part of a 5.2-mile natural gas pipeline relocation tied to the replacement of the Bourne and Sagamore bridges.
According to FERC filings dated Dec. 8 and Dec. 11, the Cape Cod Canal Pipeline Relocation Project involves replacing and rerouting existing 16-inch and 18-inch lines, removing older segments, and constructing new meter and regulating stations to maintain gas supply to National Grid’s Cape Cod customers during bridge reconstruction.
The HDD crossings, which will accommodate twin pipeline sections, represent a key engineering feature of the project. FERC has requested detailed drilling profiles, geotechnical data, bore-path stability analysis, and risk-management plans to assess the design’s feasibility. Algonquin also was asked to provide information on right-of-way configuration, access roads, and noise mitigation measures associated with the drills and ancillary construction.
FERC’s environmental review schedule projects completion of the Environmental Assessment by April 17, 2026, with final federal authorization expected by July 16, 2026. If approved, construction could begin in late 2026, coordinating with the Army Corps’ bridge replacement timeline.
The Cape Cod HDDs highlight the growing role of trenchless technology in pipeline modernization and infrastructure co-location, demonstrating how HDD design enables energy networks to adapt alongside major transportation rebuilds.
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