WCS-WTI Spread Narrows to $8.61 as Hormuz Disruption Drives Pacific Refiners to Canadian Heavy Crude

Western Canadian Select traded at approximately $8.61 per barrel below West Texas Intermediate on Thursday morning, based on OilPrice.com data showing WCS at $83.67 and WTI at $92.28 per barrel. OilPrice.com notes that WTI quotes carry an 11-minute delay while Canadian blend data carries up to 11 hours of delay, making the differential indicative rather than real-time. By comparison, Imperial Oil recorded an average Q1 2026 WCS-WTI differential of $14.34 per barrel in its SEC earnings filing, a figure that reflects audited realized prices.

Trans Mountain and the Hormuz Heavy Crude Squeeze

Western Canadian Select is a heavy sour bitumen blend with quality characteristics similar to the medium sour crudes that Saudi Arabia, Kuwait, and Iraq ship through the Strait of Hormuz. When Iranian military action disrupted Hormuz transit in early 2026, Pacific Basin refiners configured for heavy sour feedstock lost their main supply channel. The Trans Mountain Expansion Project's Westridge marine terminal in Burnaby, B.C., then became a critical export point for Canadian heavy crude reaching Asian and U.S. West Coast refiners.

The Canada Energy Regulator documented this shift in its Trans Mountain Expansion market snapshot. Canadian crude exports to countries other than the United States more than tripled after the expansion entered service in May 2024. Total Trans Mountain System throughput ran at an average of 82% utilization from June 2024 to June 2025, ranging from 76% to 89%. Before the expansion, the WCS-WTI differential averaged $18.70 per barrel from September 2023 to April 2024, then contracted to a $12.00 per barrel average through July 2025.

How Imperial Oil and the Oil Sands Majors Capture the Spread

Imperial Oil is ExxonMobil's majority-owned Canadian subsidiary; ExxonMobil holds approximately 70% of Imperial's outstanding shares. The company reported Q1 2026 net income of $940 million (Canadian dollars) on upstream production of 419,000 gross oil-equivalent barrels per day. Kearl averaged 259,000 gross barrels per day and Cold Lake averaged 155,000 barrels per day, the highest first-quarter Cold Lake output in more than eight years. Imperial noted in its Q1 earnings release that 'average bitumen realizations decreased by $7.10 per barrel, primarily driven by a weaker WTI/WCS spread.'

A shift from Q1's $14.34 differential to Thursday's indicative $8.61 represents a $5.73 per barrel improvement in Canadian crude realizations. Applied to Imperial's 419,000-barrel upstream base, that improvement adds roughly $2.4 million per day in operating cash flow for the ExxonMobil subsidiary alone. Oil Authority reported Wednesday that the Kirkuk-Ceyhan pipeline carried only 23% of its pre-conflict export volume, a supply constraint that has redirected Pacific Basin refiners toward Trans Mountain-exported Canadian heavy crude. Canada's four largest oil sands operators plan combined 2026 output of 3.9 million barrels per day, per Argus Media; the $5.73 improvement implies roughly $22.3 million of additional daily operating cash flow across that base.

Suncor Energy operates its majority-owned Syncrude joint venture at Mildred Lake and the Fort Hills mine, and absorbed the Petro-Canada brand through its 2009 acquisition. Canadian Natural Resources, now sole owner of the 315,000-barrel-per-day Albian Sands mines after an asset swap with Shell, targets record output of 1.6 million barrels per day of oil equivalent in 2026. Cenovus Energy, operator of the Husky-legacy Sunrise and Tucker bitumen projects, is approaching 1 million barrels per day of oil equivalent.

Outlook and Sensitivity to Ceasefire

The Canadian Association of Petroleum Producers forecast a 2026 average WCS-WTI differential of $14.78 per barrel in its April 2026 update, implying Thursday's indicative $8.61 level sits 41.7% below the full-year estimate. Ceasefire signals in the Iran-Kuwait conflict pulled WTI down about 3.9% to $92.28 intraday Thursday from Wednesday's $96.02 CME settlement, per OilPrice.com. If Hormuz transit normalizes, competing Persian Gulf heavy crude returning to Asian markets could partially reverse the Canadian premium. The durability of the WCS differential improvement depends on whether Iraqi and Kuwaiti southern export terminals can restart quickly relative to the pace of Trans Mountain capacity absorption.