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Part I
The Mechanism
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Nickel.
285,000 tonnes sitting in LME warehouses. Bloomberg says glut. Reuters says oversupply. Every sell-side note on my desk this morning has the same word: surplus. If you've been reading this letter, you already know that's the cue to look harder.
Here's the part that doesn't fit the chyron: nickel isn't one market anymore. It's two. Class 2 — the ferronickel and nickel pig iron that feeds stainless steel — yes, that's swimming in metal. Chinese NPI has been flooding LME sheds for two years straight. Seventy percent of the tonnage in those warehouses is Chinese-origin cathode. That's the pile everyone is pointing at.
But Class 1 — the high-purity sulfate, the briquettes, the battery-grade material that every EV cathode and grid storage system actually needs — is tightening in a way that doesn't show up in warehouse data. Battery-grade nickel sulfate just flipped back to a premium over Class 1 briquette in China. The spread hit ¥4,475 per tonne in nickel content as of September 18. That premium doesn't exist when supply is comfortable. It exists when refiners are fighting for feedstock.
The surplus and the deficit are happening inside the same metal, at the same time. That's the part nobody on television seems able to hold in their head simultaneously. It's like counting the bread rolls in first class and declaring the whole plane well-fed.
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Part II
The Diagram
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Indonesia controls roughly 60% of global nickel supply. In February 2026, Jakarta slashed the 2026 RKAB ore mining quota to 260–270 million wet metric tonnes. The 2025 approved quota was 379 million. That's a cut of more than 100 million tonnes — nearly 30%.
The smelters need 340 to 350 million tonnes of ore to run at capacity. The quota gives them 260 to 270. The math doesn't require a model. Eramet's Weda Bay operation — one of Indonesia's largest — halted ore mining in May after its individual quota was slashed 70%. That's not a throttle. That's an off switch.
Then the second lever hit. In April, Jakarta raised the HPM — the minimum domestic ore price formula — from 17% of the nickel metal price to 30%. That alone added roughly $500 per tonne to NPI production costs and over $2,500 per tonne to HPAL costs. The HPAL plants — the ones that produce the battery-grade MHP intermediate the energy transition runs on — got squeezed from both directions: less ore and more expensive ore.
Then the third lever. China banned sulfuric acid exports effective May. Indonesia's HPAL plants source approximately 75% of their acid from Middle Eastern sulfur shipped through the Strait of Hormuz — which has been functionally closed since March. Industry estimates suggest HPAL breakeven costs have risen toward $17,000–$20,000 per tonne. LME nickel trades at $15,600. At those numbers, running the plant costs far more than the product it makes.
The INSG in April revised its 2026 nickel balance from a 261,000-tonne surplus to a 32,000-tonne deficit. The revision reflected Indonesia alone. No other variable changed enough to matter.
Indonesian MHP production in Q1 2026 already showed the damage. Mysteel's survey of nine sample HPAL projects recorded March output at 31,700 tonnes in nickel content — down from 39,000 tonnes in February. That's an 18.7% decline month on month. And this was before the acid ban took full effect.
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Part III
The Weak Link
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Here's where the gap between the headline and the machine gets dangerous.
That 285,000-tonne LME stockpile? It's not wrong. It's just not useful for what the market needs next. Seventy percent of it is Chinese-origin NPI cathode — Class 2 material bound for stainless mills. You can't put it in a battery. You can't dissolve it into sulfate. It's the wrong grade sitting in the right warehouse, which is exactly the kind of inventory that creates false comfort.
Meanwhile, the actual battery-grade pipeline is draining. MHP production is falling. HPAL plants are either running at a loss or throttling back. Nickel sulfate producers in China have switched feedstock to briquettes because intermediate supply from Indonesia is drying up. That's not a substitution — it's a rationing signal. When you dissolve Class 1 briquettes to make sulfate because your normal MHP supply chain is broken, you're robbing Peter to pay Paul. The briquette market tightens. The premium ripples backward.
The Philippines have tried to step in. Indonesian ore imports from the Philippines jumped 65% in H1 2026. But Philippine ore is lower grade, logistics are constrained, and the volumes cover a fraction of the gap. You don't replace 100 million tonnes of Indonesian ore with barge loads from Mindanao. I've watched enough "alternative supply" stories to know that the replacement is always smaller, slower, and more expensive than the headline implies.
I've seen this pattern before — in palladium, in rhodium, in cobalt. When one grade is abundant and the market prices the whole complex as if it's interchangeable, the scarce grade eventually reprices violently. The LME doesn't differentiate. The battery supply chain does. And gaps like that don't stay open quietly.
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Part IV
The Chain Reaction
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The sequence from here is mechanical.
If Indonesian MHP output continues declining at Q1's trajectory, battery-grade nickel supply contracts by roughly 60,000–80,000 tonnes Ni content on an annualized basis. That's material. Global battery-grade nickel demand is growing at 15–20% per year on NMC cathode deployments and EV battery demand. The gap doesn't close — it accelerates.
The LME at $15,600 treats nickel as one commodity. But when battery manufacturers can't secure sulfate feedstock, they bid up whatever's available — briquettes, MHP, finished sulfate. The Class 1 premium widens. The first ones to feel it are smaller cathode producers without locked offtake agreements. Then the OEMs notice their cathode suppliers raising prices. Then procurement teams start calling around. I've seen the scramble. It's never orderly.
Where does capital go? Not into broad nickel ETFs — those are weighted toward NPI producers and the Class 2 surplus that everyone already sees. The edge, if there is one, is in non-Indonesian Class 1 supply. Canada Nickel's Crawford project — second-largest nickel sulfide reserves globally, targeting a 2027 construction decision in Ontario. Ardea Resources in Western Australia with battery-grade laterite outside Jakarta's policy radius. These are the projects that produce what the battery supply chain actually needs, sourced from jurisdictions that aren't simultaneously choking their own output.
The LME stockpile tells you nickel is cheap. The HPAL cost curve tells you battery-grade nickel is about to get expensive. In my experience, when warehouse data and production economics disagree, the cost curve wins. It just takes the headline another quarter to catch up.
Sources: INSG, SMM, FINI, Mysteel, ESDM, Eramet, Fastmarkets, USGS
