Canadian Mainline

The Canadian Mainline is a critical part of North America’s natural gas pipeline network. It connects the WCSB and the largest liquid trading hub in North America to multiple high value markets.

TransCanada’s Canadian Mainline stretches across the continent extending from the Alberta/Saskatchewan border east to the Quebec/Vermont border connecting with other natural gas pipelines in Canada and the United States.

The 14,101-kilometre (8,762 mile) pipeline connects natural gas supply from the WCSB and beyond with markets in central Canada and the northeastern United States. Mainline connections with pipelines on both sides of the border, including the Great Lakes, Iroquois, Portland and TQM pipeline systems, help extend its reach. Across the Canadian prairies, the system consists of five parallel lines capable of transporting approximately 7 Bcf/d.

The Canadian Mainline is expected to play a critical role in connecting B.C. shale gas and northern gas to key markets.

  • Ownership: 100 per cent owned by TransCanada
  • Key Market Interconnects: • Empress, AB • Emerson, MB • Spruce, MB • St. Clair, ON • Parkway, ON • Kirkwall, ON • Niagara, ON • Chippawa, ON • Iroquois, ON • Cornwall, ON • Napierville, QC • Phillipsburg, QC
  • 2011 Natural Gas Throughput: 1,887 Bcf*

*Canadian Mainline's throughput volumes reflect physical deliveries to domestic and export markets.  Customer contracting patterns have changed in recent years therefore the Company uses physical deliveries to measure system utilization.  Canadian Mainline physical receipts originating at the Alberta Border and in Saskatchewan in 2011 were 1,160 Bcf (2010 – 1,228 Bcf; 2009 – 1,579 Bcf).


Further Information