Iroquois Gas Transmission System

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The Iroquois Gas Transmission System is a limited partnership of four U.S. and Canadian energy companies or limited partnerships. The system includes a 416 mile (669 km) interstate natural gas pipeline that extends from the Canadian border at Waddington, New York, onward through New York State and western Connecticut, finally reaching its end point in the Bronx, New York.

The system began operations in 1992 and to this day fulfills its early promise of delivering a supply of safe, reliable natural gas to families and businesses in the many towns, cities and regions it passes through.

TransCanada effectively owns 13.7 percent of the Iroquois pipeline, through a 0.7 percent direct ownership and a 26.4 percent interest in TC PipeLines, LP.

For commercial information, visit


416 miles (669 km) in length

Proudly serving New York State since 1992

A safe, reliable source of domestic natural gas

Community Spirit

Community outreach program

We take membership in our communities to heart. Our Community Outreach Program helps us direct financial support to charities and non-profits in the communities we serve.

Community Spirit

$50,000 for the United Way Charitable Giving Campaign

In 2015, our annual week long activities in support of the United Way raised $50,000 – an amount raised both by our employees and our corporate match contributions.

Community Spirit

Partnering with Nature Conservancy

Iroquois is a proud supporter of both the Connecticut and New York State chapters of the Nature Conservancy. We act as a corporate sponsor and partner with local chapters to fund for projects within our pipeline communities.

Community Spirit

Helping protect duck wetlands

Thanks to a grant to Ducks Unlimited, this important leader in wetlands preservation was able to purchase an excavator that was used to restore 30 acres of tidal marsh in Connecticut’s Silver Sands State Park.

Documents and Maps

The Iroquois Gas Transmission System includes an interstate natural gas pipeline that extends from the U.S.-Canada border at Waddington, New York, onward through New York State and western Connecticut, finally reaching its end point in the Bronx, New York.

Explore the pipeline, compressor stations and other facilities that make up the Iroquois Gas Transmission System.


How are we regulated?

The Iroquois Gas Transmission System is is governed according to regulations outlined by the Federal Energy Regulatory Commission (FERC). It is also subject to rules and regulations of the Department of Energy administered by the Pipeline and Hazardous Materials Safety Administration, and the Environmental Protection Agency.

Federal Energy Regulatory Commission (FERC)
Local 1.202.502.6088
Toll-Free 1.866.208.3372


Ways to reach us

We’re here to answer your questions. For general questions you can contact us by email, but for a quicker response, please call us directly.

Iroquois Transmission Ltd. Partnership (TransCanada)

One Corporate Dr., Suite 600 
Shelton, CT 06484


Emergency Response
Our commitment to the safety of our pipelines and facilities is unwavering. In case of an emergency, please call the appropriate 24-hour toll-free hotline:
Iroquois: 1.800.888.3982

Landowner Helpline
A key component in maintaining the integrity of our facilities is input from all stakeholders: Indigenous communities, landowners and governments. If you have questions or concerns, please let us know.

Head Office
700 Louisiana Street
Houston, Texas 77002


Media Relations
TransCanada welcomes enquiries from media. Please direct questions to:
1.800.608.7859 Toll-free (North America)

Investor Relations
We welcome inquiries from analysts, shareholders and prospective shareholders at:
1.800.361.6522 Toll-free (North America)