Discounts for Western Canadian Select against WTI have blown past $25/bbl for late-2026 and early-2027 deliveries, an arbitrage window that should push seaborne crude exports out of Western Canada sharply higher in the coming months.

The widening differential stems directly from outages at two US Midwest refineries — Exxon's 267kbd Joliet plant and BP's 435kbd Whiting refinery — in what is the largest demand region for Canadian crude. With those barrels now struggling to find a home onshore, more crude is heading to the coast for export, though elevated long-haul freight costs could cap the upside for shipowners and traders.

The move comes at a pivotal moment for Canadian supply. Western Canadian crude production dipped in August as oil sands facilities underwent maintenance, but Cenovus Energy's 360kbd Christina Lake, Suncor's 231kbd Firebag and its 38kbd MacKay River operations have either returned online or will do so shortly, according to Argus. Upgrader maintenance is expected to run into mid-October. Looking ahead to Q4 2026 and Q1 2027, output is set to climb as producers follow their well-established seasonal pattern: they complete maintenance before winter road closures cut off oil sands sites, then run flat out once the cold sets in.

The growth projects behind the barrels

Several upstream developments underpin the medium-term supply picture. Cenovus expects to exceed 1mn boe/d and has raised its 2026 guidance by 25kbd. International Petroleum's 30kbd Blackrod Phase 1 started up in May and is ramping toward full capacity by late 2027, while Athabasca Oil is expanding its Leismer project to 40kbd over the same period. Greenfire Resources is acquiring Connacher Oil and Gas and targets combined output of 65kbd from adjacent assets in northeastern Alberta.

For producers, the binding constraint remains egress capacity — the pipeline infrastructure needed to move crude to export markets. Optimization projects are underway to ease this bottleneck over time. Seaborne exports need to be tracked across three routes: the Canada West Coast, the Canada East Coast, and re-exports from the US Gulf Coast.

Vancouver exports are effectively capped at roughly 500-550kbd by port and terminal limits. That ceiling will rise: a pipeline optimization project on the Trans Mountain Expansion pipeline using "drag reducing agents" should add 90kbd of capacity to Vancouver by late 2026 or early 2027.

Seaborne crude exports have been declining since their June highs, mainly because US refiners processed more Canadian heavy crude to capitalize on strong refinery margins — keeping barrels onshore rather than routing them to export markets. The $25-plus WCS discount now reverses that logic.

Refined products: a margin story, not a capacity story

Canadian seaborne refined-product exports in 2026 reflect market dynamics rather than any structural increase in national refining capacity. Diesel and gasoil account for much of the growth, a function of the strong margins refiners currently enjoy — a trend mirrored in US Gulf Coast product exports.

Short term, product exports from the Canada East Coast will fall. Irving Oil's 320kbd Saint John refinery is in planned maintenance until mid-November. Further turnarounds scheduled for Q3/Q4 2026 include Imperial Oil's 121kbd Sarnia refinery and Suncor's 137kbd Montreal and 146kbd Edmonton plants. The result: lower product flows to US PADD 1 and potentially higher imports from Northwest Europe to fill the gap — a modest tailwind for clean tanker demand on the Atlantic.

Propane becomes the trade to watch

LPG, mainly propane, rounds out the export growth story. Over the past year, Western Canada has become the marginal propane supplier for Chinese buyers diversifying away from US LPG because of tariffs. Exports from the Canada West Coast should get a further boost of roughly 55kbd when the Ridley Island Energy Export Facility starts up in late 2026 or early 2027.

Against a backdrop of Middle East supply disruptions, Canada — and Western Canada in particular — has positioned itself as a key marginal supplier of crude and LPG to Northeast Asian markets. With WCS differentials under pressure, upstream projects ramping and midstream capacity expanding, seaborne crude and propane exports out of Western Canada are set to climb as these projects come to fruition through 2026 and into 2027.