We have identified the need to replace approximately 13 km of an existing extra high pressure (XHP) steel natural gas pipeline (St. Laurent Pipeline) that is currently located along St. Laurent Boulevard in Vanier and Ottawa South. The project under consideration represents Phases 3 and 4 of a four-phase plan for replacing the existing St. Laurent Pipeline.

Phase 1 has been completed and Phase 2 is currently under construction. Phase 3 involves the installation of new intermediate pressure (IP) plastic gas mains in order to continue to service customers with natural gas, since the proposed replacement pipeline route deviates from the existing pipeline route. Phase 4 involves installation of new nominal pipe size (NPS) 12-inch and NPS 6-inch XHP steel pipe to replace the existing St. Laurent Pipeline. The study is being conducted in accordance with the Ontario Energy Board (OEB) Environmental Guidelines for the Location, Construction, and Operation of Hydrocarbon Pipelines and Facilities in Ontario, 7th Edition. Once the study is complete, we may apply to the OEB for approval to construct the project.

For Phase 3, we have identified the preferred routes for the proposed IP plastic mains, which consist of NPS 2-inch, NPS 4-inch, and NPS 6-inch pipeline segments. There are no alternatives for these lines, as they need to be installed within the existing road infrastructure in the area in order to continue to provide service to existing customers. For Phase4, we have identified a preliminary preferred route for the proposed NPS 12-inch and NPS 6-inch XHP steel gas mains, as well as several alternative routes/route combinations.


Project status/timeline

  • Feasibility


  • Environmental studies


  • Regulatory review


  • Regulatory approval


  • Under construction


  • In-service


Project status/timeline

  • Feasibility


  • Environmental studies


  • Regulatory review


  • Regulatory approval


  • Under construction


  • In-service


Project information