Largest and biggest petrochemical complexes in Canada

Based on production capacity, integration, and investment, Canada's largest petrochemical activities are concentrated in two main provinces: Alberta and Ontario. Here are the biggest complexes and clusters as of April 6, 2025:

1. Alberta Industrial Heartland (AIH) - Near Edmonton/Fort Saskatchewan, Alberta:
   • Description: This is Canada's largest cluster of petrochemical and heavy industrial activity by investment and overall scale. It's not a single complex but a designated industrial region hosting numerous world-scale facilities that benefit from Alberta's abundant natural gas and natural gas liquids (NGLs), particularly ethane.
   • Key Facilities/Players within AIH:
     • Dow Chemical Canada (Fort Saskatchewan Site): Operates a major ethane cracker producing ethylene, along with significant polyethylene production capacity and other chemical units. A long-standing anchor of the region.
     • Inter Pipeline's Heartland Petrochemical Complex: A major recent addition, this is Canada's first integrated propane dehydrogenation (PDH) and polypropylene (PP) complex. It converts locally sourced propane into propylene, then into polypropylene plastic pellets. Represents a significant diversification into propylene-based chemistry for Alberta.
     • Shell Scotford: An integrated site featuring a bitumen upgrader, oil refinery, and a chemicals plant producing styrene monomer and ethylene glycol.
     • Nutrien (Redwater Site): One of the world's largest nitrogen fertilizer production facilities (ammonia and urea), using natural gas as a primary feedstock. Often considered part of the broader petrochemical landscape due to scale and feedstock.
   • Significance: AIH represents the largest overall concentration of petrochemical investment and activity in Canada, leveraging direct access to low-cost feedstocks.
2. NOVA Chemicals - Joffre Site, near Red Deer, Alberta:
   • Description: This is arguably Canada's single largest integrated ethylene and polyethylene production site. It consists of multiple world-scale ethane steam crackers and associated polyethylene plants.
   • Feedstock: Primarily uses ethane extracted from Alberta's natural gas.
   • Significance: A cornerstone of Canada's plastics industry and one of North America's largest ethylene production hubs. Its scale makes it individually one of the "biggest" complexes.
3. Sarnia-Lambton "Chemical Valley" - Sarnia, Ontario:
   • Description: Canada's other major petrochemical cluster, historically built around oil refining (using crude oil/naphtha as feedstock) and local salt deposits for chlor-alkali production. It benefits from Great Lakes access and proximity to major manufacturing markets in Canada and the US.
   • Key Facilities/Players:
     • NOVA Chemicals (Corunna/Sarnia Site): Operates a significant ethylene cracker (increasingly utilizing NGL feedstocks including ethane from Marcellus/Utica shales via pipeline) and polyethylene production facilities. NOVA recently completed a major expansion of its polyethylene capacity and cracker refurbishment here, making it a very large and modern complex.
     • Imperial Oil (Sarnia Site): A large, integrated facility combining oil refining with chemical production (solvents, intermediates).
     • Other Chemical Companies: Hosts facilities from numerous other companies producing fertilizers (CF Industries), styrene (INEOS Styrolution), carbon black (Cabot), etc.
   • Significance: While historically based on different feedstocks than Alberta, Sarnia remains a vital hub, especially with recent investments like NOVA's expansion enhancing its scale and competitiveness using advantaged North American NGLs.

Summary:

• The Alberta Industrial Heartland (AIH) is the largest concentration or cluster of petrochemical activity and investment in Canada.
• The NOVA Chemicals Joffre site in Alberta is likely the single biggest integrated site primarily focused on ethylene and polyethylene.
• The NOVA Chemicals Corunna/Sarnia site in Ontario is also a major complex, significantly enhanced by recent large-scale expansions.
• The Inter Pipeline Heartland Petrochemical Complex within AIH is the newest large-scale facility and Canada's only integrated PDH/PP plant.

Therefore, depending on whether you define "largest" as the biggest regional cluster or the biggest single production site, the answer points primarily to facilities and clusters within Alberta, with Sarnia, Ontario, being the other major center.