The price gap between Western Canadian Select and the American WTI benchmark has ballooned to $26.40 a barrel, a significant increase from mid-September levels. Historically, this discount stems from the heavy, sour nature of Alberta’s crude and its geographic distance from U.S. Gulf Coast refineries. However, analysts suggest the current pressure is driven by shifting demand rather than simple pipeline constraints.

Global refiners are increasingly prioritizing lighter, sweeter crude grades to maximize diesel output, a reaction to supply disruptions in Russia. Simultaneously, soaring tanker rates—now reaching historic highs—have made the long-distance transport of Canadian oil to Asian markets prohibitively expensive. Shipping costs to Asia have surged from approximately $3 per barrel to $42, effectively eroding the competitiveness of Canadian exports.

Adding to the strain, U.S. Gulf Coast refineries are finding alternatives in Venezuelan heavy crude, which has returned to the market under evolving sanction policies. With the Trans Mountain pipeline expansion already operating at its full 890,000 barrel-per-day capacity, Canadian producers have little room to maneuver. Despite higher global prices strengthening producer balance sheets, TD Cowen expects these deep discounts for Canadian heavy oil to persist throughout 2027.