1. EN
  2. FR
  3. ES
Schedule K-3 tax packages for 2021 are now available online. Other information on this website is no longer being maintained but will be available for reference until June 2023.

Great Lakes Gas Transmission

This bi-directional pipeline delivers gas to customers in the U.S. Midwest and Central Canada. Great Lakes plays a key role in balancing natural gas demands in upper Midwest energy markets by managing seasonal fluctuations in gas supply and demand, and providing access to storage fields in Michigan and Southern Ontario.


Great Lakes compressor facility


Great Lakes map

Asset information

TCP Ownership

53.55% is held by subsidiaries of TC Energy

Began operations



2,115 miles


2.4 Bcf/d


Compressor stations


Primary supply source

Emerson 2 interconnect

Originates near:

Emerson, Manitoba, Canada
(St. Vincent, Minnesota)

Terminates near

 Sault Ste. Marie, Michigan; and St. Clair, Michigan

Primary markets served

Union Dawn interconnect,
Minnesota, Wisconsin and Michigan

New opportunities

The Alberta XPress project, being undertaken by ANR, a TC Energy-owned system, is expected to utilize capacity on Great Lakes to connect growing WCSB supply to U.S. Gulf Coast LNG export markets. Requiring no material capital spend, Great Lakes is expected to benefit from a total 165,000 Dth/d long-term, max rate contractual arrangement with ANR for an average term of 19 years with an anticipated in-service date in 2022.

Documents and Maps