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See Legal Notices for important information on the climate-related content on this website.

Canadian Mainline


The Canadian Mainline, still connecting customers more than 60 years later.

The Canadian Mainline safely carries natural gas from the Western Canada Sedimentary Basin (WCSB) to Ontario and beyond through its Long-Term Fixed Price (LTFP) service. Throughout its history, this 14,082 km (8,750 mile) pipeline has helped create jobs, spurred development and powered industries in communities nationwide.

For commercial information, visit TCCustomerExpress.com.


A positive impact in Canadian communities

The new Mackenzie Vaughan Hospital will positively impact the quality of life for people across Ontario's York Region. We recently toured the hospital construction site to learn more about how our $250,000 donation will support the Mackenzie Health Foundation’s campaign to build this critical community infrastructure and Canada's first smart hospital.


14,082 km (8,750 miles) in length

Carries natural gas from the Western Canada Sedimentary Basin

Delivers fuel for millions of Canadians


Documents and maps

The Canadian Mainline natural gas pipeline safely carries natural gas from Alberta and Saskatchewan to Ontario and beyond. Learn more below.


How are we regulated

The Canadian Mainline (Mainline) is governed according to regulations outlined by the Canada Energy Regulator (CER).

The Mainline currently operates under fixed tolls as negotiated in the 2021-2026 Mainline Settlement, which ends December 31, 2026.

The Settlement is the product of a comprehensive, collaborative process of engagement and negotiation between TCPL and interested Mainline stakeholders. It enhances competitiveness and provides toll certainty for customers while maintaining stable revenue for TC Energy. The Settlement addresses a broad range of inter-related services and tolling matters on the Mainline system, including the approach to establishing fixed-tolls during the six-year term of the Settlement, the derivation of the revenue requirement, toll design and tariff provisions, and various services and tolling matters. The Settlement represents a balance of interests resulting from compromises of the diverse interests and positions of the parties.

Regulatory contact

The Canadian Mainline System is governed according to regulations outlined by the Canada Energy Regulator (CER).

Canada Energy Regulator (CER)
Local 1-403-292-4800 1-403-292-5503
Toll-Free 1-800-899-1265 1-877-288-8803

Ways to reach us

If you have any questions about the Project, please reach out to us via the contact information below. 

Canadian Mainline

Canadian Mainline (TC Energy)
450 – 1 St. SW
Calgary, Alberta
T2P 5H1

        Toll-Free (North America)


Emergency Response
Our commitment to the safety of our people, pipelines and facilities is unwavering, visit our Contact page for our complete list of emergency numbers.
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
450 – 1 St. SW
Calgary, Alberta
T2P 5H1

Media Relations
TC Energy 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)