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Groundbirch Mainline Loop (Saturn Section) and Saddle Hills Compressor Station C4 Unit Addition Project


The Western Canada Sedimentary Basin (WCSB) is one of North America’s most prolific natural gas production basins and is of key importance to the Canadian economy. Given the pace of production of natural gas in Alberta and British Columbia, an important issue for WCSB producers is getting their product to market. Natural gas producers asked NOVA Gas Transmission Ltd. (NGTL), a wholly owned subsidiary of TransCanada PipeLines Limited (TCPL), an affiliate of TC Energy, to increase natural gas transportation service on the existing NGTL System. We have received regulatory approval to expand an existing compression facility, and have completed an additional pipeline section, which we own and operate, to meet these transportation needs.

The Project connects to the approximately 25,000 km NGTL System, which transports natural gas, safely, efficiently and reliably every day.

Groundbirch Mainline Loop (Saturn Section)

The Groundbirch Mainline Loop (Saturn Section), now in service, is located in B.C., within the Peace River Regional District. The project included the installation of approximately 23 km of 42-inch diameter pipeline looping an existing NGTL pipeline from the existing Saturn No. 2 Receipt Meter Station, approximately 32 km southwest of Fort St. John, BC, to a future valve site and approximately 36 km west of Dawson Creek. The pipeline loop paralleled the existing NGTL Groundbirch Mainline (Saturn Section) and other existing rights-of-way, where possible, helping to minimize the impact of the land and effects on the environment.

Saddle Hills Compressor Station C4 Unit Addition

The Saddle Hills Compressor Station C4 Unit Addition is a 30MW compressor unit addition, located in Saddle Hills County, Alberta, adjacent to our existing Saddle Hills Compressor Station approximately 60 km East of Dawson Creek, BC.

Project Schedule Change

As the Project progressed, new information became available and details have changed from the time the application was filed. NGTL regularly reviews system capacity requirements and contractual underpinning for proposed projects. After further evaluation of the service requirements to meet the changing demands for transportation of natural gas on the NGTL system, NGTL met with customers and determined a December 2023 in-service date for the Saturn section.

NGTL filed a Project Notification with the Canada Energy Regulator (CER) in accordance with the CER Early Engagement Guide and Interim Guidance in March 2020. Since the submission of the Project Notification, the compressor station unit addition name has changed, from ‘B4 Unit Addition’ to ‘C4 Unit Addition’, which was done for system naming efficiencies.

Project schedule

Q4 2019

Engagement Start

Q1 2020

Project Notification

Q4 2020

Section 214 CER Application

Q2 2021

CER Approval received

Q1 2023

Pipeline and compressor station construction start

Q4 2023

Saturn Section in-service

Q2 2024

Anticipated in-service date of Saddle Hills Compressor Station C4 Unit Addition


Documents and maps

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How are we regulated

The proposed Project will be part of the NGTL System, which 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


Regulatory information

NGTL filed a Project Notification with the CER on March 3, 2020 which can be viewed on the CER’s website.


Ways to reach us

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

Public Affairs

450 – 1 St. S.W.
Calgary, Alberta
T2P 5H1

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)