The Battery Supply Chain's Hidden Hormuz Problem — And Why It's Bigger Than Oil Prices
Most coverage of the Hormuz crisis focuses on the number that everyone can visualise: the oil price. It makes sense — Brent crude hitting $120 a barrel is a headline that needs no translation. But for anyone tracking the long-term trajectory of the energy transition, there are four other numbers that matter just as much, and they're getting far less attention.
Sulfur. Methanol. Synthetic graphite. Helium.
Each of these commodities flows through the Strait of Hormuz in substantial quantities. Each of them is a critical input to the clean energy and technology industries that are supposed to be leading the world away from its dependence on the very oil that's making the crisis so acute. The irony is pointed: the conflict that has disrupted fossil fuel supply is simultaneously disrupting the materials needed to build the alternatives.
Sulfur: The Battery Input Nobody Talks About
Nearly half of all global seaborne sulfur trade passes through the Strait of Hormuz. Sulfur is a primary byproduct of oil and gas refining operations — the same operations that have largely ground to a halt in the Gulf. Since January, sulfur prices have roughly doubled.
Why does this matter for batteries? Sulfuric acid — derived from sulfur — is the primary reagent in a process called high-pressure acid leaching, or HPAL. HPAL is how the mining industry refines nickel, cobalt, and copper from laterite ores into the battery-grade materials that go into EV cathodes. If sulfuric acid becomes expensive or scarce, HPAL economics collapse. The Indonesian nickel processing sector, which accounts for a growing share of global battery-grade nickel supply, has been facing operational slowdowns precisely because of this constraint.
Sulfuric acid also sits at the centre of phosphate fertilizer production — which is why the fertilizer crisis and the battery materials crisis are not two separate problems but one problem wearing two different faces.
Synthetic Graphite: The Anode Material Under Pressure
Synthetic graphite is the dominant anode material in lithium-ion batteries. It is manufactured from petroleum coke — a solid carbon byproduct of oil refining. When Gulf refineries cut runs by six million barrels per day in April (as the IEA reported), they also dramatically reduced the output of petroleum coke available for synthetic graphite production.
China is by far the world's largest producer of synthetic graphite, and it relies on petroleum coke imports for feedstock. Gulf producers have historically been competitive suppliers. With those sources disrupted, Chinese synthetic graphite manufacturers have been competing for alternative petroleum coke from U.S., Canadian, and Indian refineries — driving up prices across the board.
For EV battery manufacturers already dealing with cost pressures from high lithium and cobalt prices in earlier years, graphite anode cost inflation is unwelcome at any point in the supply chain. It filters through, eventually, into battery pack prices — partially offsetting the cost reductions that the industry has worked years to achieve.
Methanol and the Chemical Industry Squeeze
Around a third of global seaborne methanol trade transits Hormuz. Methanol is not a battery material directly, but it underpins the chemical intermediary chains that produce resins, coatings, and plastics used extensively in battery enclosures, separator films, and thermal management components. It is also a feedstock for certain fuel cell applications.
The World Economic Forum reported that Chinese methanol port inventories have fallen toward "below warning thresholds" — a level that, if sustained, would begin constraining plastics and chemicals production in the world's largest manufacturing economy. The effects would be diffuse rather than dramatic: not a headline but a thousand small frictions accumulating across supply chains.
What It Means for the Energy Transition
The deeper issue is one of timing and dependency concentration. The energy transition was built on the assumption that commodity supply chains would diversify gradually and gracefully. The Hormuz crisis has demonstrated that they have not. Critical materials for both the fossil fuel economy and its successors are flowing through the same narrow waterway, controlled by the same geopolitical actors, exposed to the same risks.
The World Economic Forum's Global Risks Report 2026 flagged geoeconomic confrontation as a primary driver of economic and industrial policy, and the crisis has validated that assessment comprehensively. Energy security and supply chain security are no longer separable concepts — if they ever were.
The companies and countries best positioned for the next decade are those that are now mapping their critical materials dependencies with the same rigour they previously applied to their oil supply chains, and building redundancy into the supply chains that underpin the transition. That is a longer and more expensive project than installing solar panels, but it is now clearly unavoidable.
The Investment Implication
For investors and procurement teams tracking clean energy supply chains, the Hormuz crisis offers a useful stress test. Which battery manufacturers have sufficient raw material inventory to ride out a multi-month supply disruption? Which have built geographic diversification into their cathode material sourcing? Which are entirely dependent on single-corridor supply of sulfuric acid or petroleum coke?
The answers to those questions are now commercially significant in a way they weren't eighteen months ago. The battery supply chain is mature enough that investors can differentiate between companies with supply chain resilience and those without. The Hormuz crisis has provided the data point that makes that differentiation financially material rather than merely theoretically interesting.
There is also a longer-term structural shift worth noting. The crisis has validated, in the most direct possible way, the case for circular economy approaches in battery manufacturing. Recovered sulfuric acid from battery recycling processes, recycled graphite anodes, and closed-loop material systems that reduce primary raw material dependency are no longer just environmental talking points. They are supply chain insurance policies. That changes the economics of battery recycling investment fundamentally, and the capital markets are beginning to reflect it.