Analysis: WCS-WTI Gap Could Narrow for Midwest Refiners


   
Miguel E. Andujar
DTN Refined Fuels Market Reporter

   SECAUCUS, NJ (DTN) -- Shifts in global crude flows triggered by the Strait 
of Hormuz blockade could narrow the Western Canada Select discount to the West 
Texas Intermediate, impacting Midwest refiners who particularly rely on 
Canadian crude.

   The WCS-WTI gap hovers at around $13.50 bbl, recovering from the March 2 low 
of $12.70 bbl reached after the outbreak of the Iran war on February 27.

   The difference could shrink again if WCS exports to Asia gain traction as 
Chinese refiners, especially, seek alternatives to Middle East heavy sours 
trapped by the Hormuz blockade.

   In fact, higher exports to Asia were one reason for the sharp narrowing of 
the WCS discount to WTI over the past two years, the Montreal Economic 
Institute (MEI) observed in a March 26 report.

   With the launch of the Trans Mountain Expansion pipeline in May 2024, 
Canadian crude exports to Asia surged from virtually zero to over $3 billion by 
the fourth quarter of 2025, the institute noted. It said the WCS-WTI gap itself 
shrank by 37.5% in the 18 months following the pipeline's completion compared 
to the 18 months prior, to stand at about $12.50 bbl now from nearly $20 
previously. 

   "Indeed, (export) diversification led to relatively higher prices for WCS 
than before, and thus to a smaller gap with the price of a barrel of WTI," the 
MEI added. "The full effect of diversification will undoubtedly only be felt 
over time."

   
Calm Before Storm?

   Midwest fundamentals remain stable for now. PADD 2 distillate inventories 
stood at 30.591 million bbl during the week ended March 20, down about 7% on 
the year, the U.S. Energy Information Administration reported. Weekly refinery 
utilization held at 90%, little changed from 89.5% a year ago.

   Local product markets also point to a futures driven move rather than a 
tightening physical balance. Chicago ULSD was assessed at a 93cts discount to 
front-month futures on March 27, compared with a 15.5cts discount in the same 
session last year, while Group 3 traded at a 92cts discount versus a 1.75cts 
discount a year earlier.

   At the same time, NYMEX ULSD futures have surged, with the April contract 
settling at $4.2556 gallon on March 26, up nearly 95% from $2.1879 gallon a 
year earlier, indicating flat prices have outpaced any tightening in Midwest 
cash markets.

   Lower stocks can reduce the buffer if demand strengthens, but steady 
refinery runs and ongoing pipeline inflows indicate no immediate supply 
constraint.

   The Midwest impact, if it develops, is likely to be gradual. Rather than 
losing access to crude, PADD 2 refiners would face higher feedstock costs as 
Canadian barrels become more competitive in global markets.

   "This hasn't shown up in Midwest balances yet, but it's something the market 
is watching," a source familiar with the region said. "If those barrels start 
moving west and the WCS discount tightens, that's when refiners here start to 
feel it."




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