Trans Mountain Hits Apportionment for First Time Since 2024 Opening as Asian Buyers Redirect From Hormuz-Blocked Gulf Crude

The Trans Mountain pipeline entered apportionment status for June 2026, the first time shipper demand has exceeded available spot capacity since the 890,000-barrel-per-day system completed its expansion in May 2024. Apportionment occurs when requests for spot capacity on a pipeline exceed what is available for that shipping month. Shipper demand oversubscribed the Alberta-to-Burnaby corridor for June, driven by Asian refiners redirecting crude purchases away from Gulf oil blocked by the Strait of Hormuz closure, per BOE Report citing pipeline operator data. As recently as last summer, the pipeline was running at approximately 84% of its expanded capacity, a figure that makes the apportionment shift all the more significant.

WCS Netback Falls to Near $68.63 Per Barrel as WTI Drops 5% on Iran Deal

Western Canadian Select for July delivery in Hardisty, Alberta settled at $11.90 per barrel below WTI on June 10, 2026, according to Enverus data reported by BOE Report. Al Salazar, head of research at Enverus, said the WCS differential has been volatile since the U.S.-Iran conflict began, compressing as WTI declined from earlier highs. WTI fell to $80.53 per barrel on the CME as of Monday morning, June 15, down 5.1% from Friday's $84.88 close, after the US-Iran Hormuz peace deal was announced Sunday. If the June 10 differential of $11.90 per barrel held through Monday, WCS at Hardisty would clear near $68.63 per barrel against the current WTI quote.

The Alberta Energy Regulator's 2026 base case forecast put the average annual WCS-WTI differential at $12 per barrel, per the AER's ST98 statistical report. Enverus data placing June 10 trading at $11.90 per barrel positioned recent transactions marginally tighter than the AER's own projection. Through April and May, the differential compressed as elevated WTI prices drew additional volumes toward Canada while the Strait of Hormuz kept Gulf crude off the market. Whether the spread widens again depends largely on whether Gulf producers restore export flows after a June 19 Hormuz reopening.

Trans Mountain Corporation: A Federal Crown Asset at Full Capacity

Trans Mountain Corporation is a wholly-owned federal Crown corporation of the Government of Canada, acquired from Kinder Morgan Canada in 2018 for approximately C$4.5 billion. The government purchased the asset to ensure the TMX expansion was completed, with a stated intention to eventually divest the pipeline to private or institutional investors. Canada's total oil output is on track to exceed the 2025 production record of 5.3 million barrels per day in 2026, according to the Canada Energy Regulator's market outlook. Trans Mountain has planned optimization projects, including drag-reducing agents and new pumping stations, projected to add 300,000 barrels per day of throughput capacity by the end of 2028.

The system, when fully optimized, will be the only twinned crude oil pipeline carrying Alberta production directly to Pacific tidewater. Apportionment at this stage means the existing 890,000 barrels per day of capacity is insufficient to meet current shipper demand. Trans Mountain confirmed that June apportionment affects spot shippers, not contracted volumes. Contracted shippers retain guaranteed space and face no impact from the apportionment designation.

If Hormuz Reopens June 19, Canadian Oil Loses Its Asian Demand Advantage

The US-Iran framework agreement announced June 14 calls for a formal signing in Switzerland on June 19, with the Strait of Hormuz set to reopen for commercial shipping on the same day. A reopened Strait gives Asian refiners direct access to Saudi Arabian, Kuwaiti, and Iraqi crude, which requires shorter tanker voyages and lower freight costs than Canadian heavy oil moving through the Port of Vancouver. That removes the primary geopolitical motivation that brought Asian buyers to Trans Mountain in the first place. The pipeline's first apportionment in two years could prove short-lived if Gulf crude flows normalize within weeks of the signing.

Trans Mountain's 2028 capacity expansion targets are designed for a market where Canadian production growth alone drives throughput demand, not a temporary displacement of Gulf crude. Canadian oil output has room to grow with or without the Hormuz displacement effect, as Alberta oil sands producers including Cenovus, Suncor, and Canadian Natural Resources hold multi-year expansion plans requiring incremental pipeline capacity. The apportionment in June 2026 reflects both the Hormuz-driven demand surge and underlying production growth. Only one of those two forces survives the June 19 signing date.