Middlesex Extension Project



The Middlesex Extension Project enhances the reliability of service to an existing power generation facility which provides electricity to New Jersey, and further strengthens the region’s energy infrastructure by providing access to alternative, often lower cost, natural gas supplies.

The Middlesex Extension Project connects Texas Eastern Transmission, LP’s (Texas Eastern) existing Line 20 Mainline pipeline to the existing Transcontinental Gas Pipe Line (Transco) pipeline facilities, including its Mainline E and Woodbridge Lateral.

This optimization project improves the efficiency of New Jersey’s natural gas system and help to reduce regional energy costs by providing access to alternative supply during periods of constraint on the natural gas system. This additional access also results in increased competition and reduced price volatility, which can occur at times when demand for natural gas is high, often during the winter months. Additionally, greater access to clean, dependable natural gas-fired power generation can help enable New Jersey’s adoption of renewables, by serving as a reliable, affordable partner for weather-dependent sources of power generation.

Project facilities include an approximately 1.5-mile, 20-inch diameter natural gas pipeline, a new metering and regulating station, pipe inspection and tie-in facilities, and interconnecting piping.

The project was constructed using proven and safe techniques and is designed to minimize potential impacts to landowners, the environment and communities, as Project facilities will be within, along or adjacent to existing utility and transportation corridors.

Texas Eastern is an indirect, wholly owned subsidiary of Enbridge Inc.

Middlesex Extension Project map

Project overview:

  • Type: Natural gas pipeline
  • Status: In service
  • Peak day capacity: 264,000 dekatherms per day (Dth/d)
  • Expected to transport: Natural gas
  • Ownership: Texas Eastern Transmission, LP
  • FERC docket number: Docket No. CP20‐30‐000

Project Information:

Project Safety

A number of safety measures will be employed to ensure the Middlesex Extension Project is built and operated safely.

The pipeline to be installed is made of durable high-strength carbon steel, and a warning tape will be buried above the pipeline along non-Horizontal Directional Drill (HDD) sections to provide an added layer of security alerting any potential excavator of the buried pipe, in the event numerous other preventative measures are ignored.

Once operational, a number of initiatives will be in place to support safe operation of the pipeline and associated facilities. Our Public Awareness Program engages local officials, excavators, and those who work and live along our pipeline facilities; while pipeline markers and communication on how to work safely near pipelines through the use of 811 “Call Before You Dig” helps prevent damage to our pipeline facilities.

We maintain and regularly patrol our rights-of-way, and as part of our Integrity Management Program, we maintain integrity of the pipe through cathodic protection, coating maintenance, inline inspections and cleaning, and repairs when necessary.

Additional safety measures include the use of remote-controlled valves, 24/7 monitoring by our Gas Control Center, and an overall Enbridge safety culture which guides everything we do.

Illustration of a Horizontal Directional Drill procedure