Tearing apart the Canadian potash terminal choke point

Potash.

The headlines this week are treating the Belarus sanctions reversal as a supply story. More tons back in play, global prices soften, farmers catch a break. That's the dashboard read. The engine is doing something more complicated, and nobody covering the fertilizer beat is looking at it.

Potash is not a commodity you can route around a problem. It's heavy, corrosive, and moves in bulk — unit trains of 200-plus cars running 2,000 kilometres from mines in Saskatchewan to deep-water terminals, then bulk carriers to Brazil, Indonesia, China. The supply chain has almost no redundancy built in. Every tonne that reaches a farm starts its journey at one of a handful of port terminals on Canada's west coast. If those terminals back up, the mines back up. The mines don't have silos big enough to absorb a sustained export interruption — when Vancouver chokes, production curtailments follow within weeks. I watched this happen in 2023. It wasn't subtle.

The consensus narrative says Belarus re-entering the market is bearish for Canadian producers. On paper, that's correct. In the real supply chain, it's almost irrelevant — because Belarusian potash can't reach the buyers who need it most. The EU has escalating tariffs that hit €350 per tonne by 2028. The port of Klaipėda in Lithuania has been closed to Belarusian cargo since February 2022. Every tonne Belaruskali ships goes through Russian ports, primarily Ust-Luga — adding cost, adding political risk, and adding the kind of counterparty exposure that most Western trading houses quietly won't touch.

The market is pricing a Belarus comeback. The pipeline is still broken. And right at the moment the Canadian system needs to absorb all of that unmet demand, it is about to get structurally stressed in a way nobody is discussing.

Story off. Numbers on.

Canpotex — the export marketing joint venture owned by Nutrien and Mosaic — moves roughly 15 million tonnes of Canadian potash per year. The majority flows west in unit trains to Vancouver's Neptune Terminal and to Portland, Oregon. A smaller slice goes east through Thunder Bay and Saint John. That west coast corridor is the spine of the entire system.

The Westshore terminal in Delta — until recently a pure coal export facility — is mid-renovation to handle 4.5 million tonnes of potash per year for BHP's Jansen mine, which is targeting first production in late 2026. That upgrade was still under construction as of this spring. Jansen Stage 1 is a $10.5 billion project sitting 140 kilometres east of Saskatoon. It needs a working terminal to be anything other than an expensive hole in the ground.

Meanwhile Nutrien, which co-owns Neptune Terminal and is the largest producer in the system, announced last November it chose the Port of Longview in Washington state — not British Columbia — for a proposed new export terminal capable of handling 5 to 6 million tonnes annually. Final investment decision pushed to 2027 at the earliest. For now: not a single new tonne of Canadian export capacity is coming online in time to absorb the Jansen ramp.

The Belarusian Nezhinsky MOP plant — 2 million tonnes per year of new capacity — was scheduled for commissioning in Q2 2026. That volume still has to exit through Russian ports and reach markets the EU hasn't locked out. Belarus exported 12 million tonnes last year at 88% of pre-sanctions levels, almost entirely via that Russia routing. None of that changes the west coast terminal math for Canada. The two supply chains serve overlapping but distinct customer bases, and the Canadian one is running out of dock space.

Neptune Terminal at the Port of Vancouver. That's the weak link. Not the mines. Not the rail. The dock.

Neptune is co-owned by Canpotex, which means Nutrien and Mosaic are effectively self-insuring their own export choke point. And that terminal has a documented, recurring, entirely predictable vulnerability: ILWU labour disputes. In the summer of 2023, a strike at the Port of Vancouver was severe enough that Canpotex withdrew all offers for new sales and Nutrien curtailed production at its Cory mine. Not "reduced." Curtailed. The word they use when the silos are full and the trains have nowhere to go.

Here's where it compounds. The Westshore terminal expansion — the one that's supposed to unlock Jansen — is being completed at the same time the whole system is running at peak load. A complex, first-of-kind conversion from coal export to potash export, with new conveyor systems and storage domes, being commissioned during a period when there is no slack anywhere in the logistics chain. Commissioning delays on port infrastructure are not exotic events. They are the norm. The Westshore project team is good — but every week of delay in fall 2026 is a week where Jansen's first product has nowhere to load.

Nutrien's decision to site its new export terminal in Longview, Washington rather than British Columbia tells you something directly. They evaluated 30 criteria. Rail access, deep water, regulatory environment. The regulatory environment in B.C. for new port infrastructure is not conducive to moving quickly. They didn't say that in the press release. They didn't need to. The address says it.

Brazil imports roughly 13.5 million tonnes of MOP per year — the largest single national market on the planet. Brazilian buyers have a spring application window that begins building inventory in Q3. If Westshore's commissioning slips and Neptune hits a labour dispute in the same window, Brazilian buyers face a choice between waiting on Canadian tons and shopping for alternatives. The alternatives are Russian-routed Belarusian product. Which means the Belarus sanctions story and the Vancouver terminal story are not separate narratives. They are the same machine, and both parts are under stress at the same time.

There are two ways this resolves. One the market is already pricing. One it isn't.

The priced scenario: Belarusian tons flow back to the US, Jansen ramps smoothly on schedule, global MOP softens through Q3, and Brazilian and Indonesian buyers use the new competition to push Canadian contract prices lower. Nutrien and Mosaic underperform expectations. This is the sell-side consensus. It's not wrong as a direction. It just requires everything to go right simultaneously — Westshore commissioning on time, no Neptune labour disruption, Belarusian payment channels clearing before the application window, and a Jansen ramp that runs on schedule despite being the most complex mine commissioning Canada has attempted in decades.

The unpriced scenario: the Westshore commissioning slips by six to eight weeks, which is ordinary for projects of this complexity. This is not a catastrophe — it's a scheduling footnote. But it lands precisely when Jansen's first product needs to move and Neptune is running at capacity. Nutrien has curtailed mine production before for less. BHP, for its part, has spent $10.5 billion and seven years getting Jansen to this point. They won't curtail quietly.

Where does capital go if the unpriced scenario materializes? Not the diversified fertilizer majors — Nutrien and Mosaic carry retail and nitrogen exposure that dilutes a pure MOP move. The edge, if there is one, is in watching the Westshore commissioning timeline very closely from August forward and treating any delay announcement as a sharper signal than the market will initially price it as.

The Belarus story is real but it's slow — financial channels take months to reestablish, Russian port logistics don't improve overnight, and EU buyers are structurally locked out. The Vancouver story is fast — a commissioning slip is a single announcement, a strike at Neptune is a single vote. The market is watching the slow story. The fast story is what moves first.