Gas Transmission Northwest

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Gas Transmission Northwest is a 1,353 mile (2,177, km) natural gas pipeline system that transports Canadian natural gas to communities in Washington, Oregon and California. With capacity to deliver as much as 2.9 billion cubic feet (Bcf) per day, Gas Transmission Northwest offers families and businesses in the Pacific Northwest and California a safe and reliable source of daily fuel for cooking, heating, air conditioning and more.

TransCanada operates Gas Transmission Northwest and effectively owns 26.8 percent of the pipeline through its interest in TC PipeLines, LP.

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1,353 miles (2,177 km) in length

12 compressor stations

Began operations in 1961

Documents and Maps

Gas Transmission Northwest is a 1,353 mile (2,177, km) natural gas pipeline system with authorized capacity of 2.9 billion cubic feet (Bcf) per day.

Explore the infrastructure and facilities that make up the system.


Regulatory Contact

Gas Transmission Northwest 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.

Gas Transmission Northwest (TransCanada)
700 Louisiana Street
Houston, Texas 77002

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:
US: 1.800.447.8066

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)