NPI–Class I Nickel Spread Narrows as Metal Oversupply Pressures Prices

Nickel cathode

NPI–class I nickel spread narrowed sharply in March as persistent oversupply in the class I nickel market pushed metal prices lower, while nickel pig iron prices stayed supported by elevated production costs. The average spread fell to $2,975/t in March, down from the 2025 annual average of $3,696/t.

The narrower NPI–class I nickel spread shows how differently the two nickel markets are behaving. Class I nickel remains under pressure from high exchange stocks and weak absorption from battery and alloy users. NPI, by contrast, is being held up by Indonesian ore costs and a firmer production cost floor.

The current spread also discourages additional class I output from NPI conversion. Estimated conversion costs from NPI to class I nickel remain around $4,000/t, meaning producers using NPI as feedstock would face negative margins at current price levels.

This creates an important signal for the nickel supply chain. Oversupply is still weighing on refined metal, but high feedstock and processing costs are preventing prices from falling evenly across all nickel products.

Class I Nickel Oversupply Keeps Metal Prices Under Pressure

Class I nickel oversupply remains the main reason behind the compressed spread. London Metal Exchange nickel stocks reached 289,506t on 26 February, the highest level since May 2018.

Ample exchange inventory has pressured class I nickel prices and opened an import arbitrage window into China. China’s nickel imports rose by 18% in January-February as lower overseas prices made imported metal more attractive.

However, end-user demand has not been strong enough to absorb the surplus. Battery and alloy-sector consumption remained insufficient to clear the additional metal units, pushing Shanghai Futures Exchange nickel stocks higher.

SHFE nickel inventories rose to 65,764t on 10 April from 45,544t on 9 January. This inventory build shows that imports and domestic availability are running ahead of immediate consumption.

The oversupply problem is structural in the near term. New class I capacity has continued to emerge, while demand from stainless steel, batteries and specialty alloys has not grown fast enough to rebalance the market.

The NPI conversion route is therefore unattractive. When the NPI–class I nickel spread sits below conversion cost, producers have little incentive to turn NPI into refined metal. This helps prevent additional supply from that route, but it does not immediately remove existing class I oversupply.

NPI prices have been more resilient because they are tied closely to Indonesian ore economics. Indonesian nickel ore prices remain elevated and continue to trade above the government-mandated price floor.

Concerns over tight ore availability have supported feedstock values. This has limited NPI producers’ willingness to cut prices, even though stainless steel demand remains only average.

That cost floor is important. NPI is not rising because downstream demand is exceptionally strong. It is holding because ore, mining quotas and Indonesian pricing policy are preventing a deeper fall.

The result is a distorted market structure. Class I nickel is being pulled down by inventory pressure, while NPI is being supported by feedstock costs. This explains why the spread has narrowed despite weak overall nickel sentiment.

MHP and HPAL Costs Could Rebuild the Spread Over Time

Mixed hydroxide precipitate is becoming the more important cost driver for future class I nickel production. Much of the newly added class I capacity relies on MHP feedstock rather than NPI.

Integrated producers with their own Indonesian MHP capacity have a cost advantage. Their MHP production costs are estimated at around $13,000/t in nickel metal equivalent, with conversion costs from MHP to metal at roughly $3,000/t.

This places the total cost of class I production through the MHP route at about $16,000/t. That cost base can still support production for integrated operators, but it leaves less room for producers relying on third-party MHP.

The market problem is that MHP supply is not sufficient to meet all feedstock requirements for new class I capacity. This creates competition for MHP units and limits how much low-cost refined nickel can be produced through this route.

Cost pressure is also rising across HPAL operations. Middle East tensions have tightened sulphur availability and lifted sulphur prices, which directly affects MHP producers that rely on sulphuric acid-intensive processing.

Sulphur and sulphuric acid are central to HPAL economics. Any disruption to sulphur flows can raise operating costs, reduce margins or force producers to curtail output if acid availability becomes constrained.

Indonesia’s revised nickel ore pricing formula adds another layer of pressure. The new formula is expected to have a greater impact on ore consumed by HPAL projects than on ore used by rotary kiln electric furnace operations.

This is because HPAL ore often trades closer to official pricing levels, while RKEF ore used for NPI already trades at premiums well above the benchmark. As a result, HPAL producers may feel the revised HPM framework more directly.

Higher ore prices and higher taxes could lift MHP production costs. That would eventually raise the cost floor for class I nickel produced through the MHP route, especially for integrated producers that had previously enjoyed lower feedstock costs.

This cost inflation may support class I nickel prices over time. While current oversupply is weighing on metal values, producers cannot keep adding supply indefinitely if feedstock and conversion costs rise.

NPI prices are also likely to remain anchored by costs. Indonesian ore tightness, quota uncertainty and pricing reforms should continue to support NPI even if stainless steel demand stays moderate.

As MHP costs rise and NPI prices remain cost-supported, the NPI–class I nickel spread may widen back toward the $3,500-4,000/t range over time. That would restore a more normal relationship between feedstock products and refined metal.

However, the timing depends on inventory absorption. Class I nickel prices will struggle to recover strongly until exchange stocks stop rising and downstream demand improves.

For battery supply chains, the key issue is cost pass-through. If MHP and HPAL costs rise while class I prices remain weak, margins across nickel sulphate and cathode material chains could tighten.

For stainless steel producers, NPI resilience means raw material costs may remain sticky even without strong demand. This could limit margin recovery if finished stainless prices do not rise in parallel.

The nickel market is therefore entering a complex adjustment phase. Oversupply is pushing refined metal lower, while policy, ore availability, sulphur costs and HPAL economics are raising the cost floor beneath intermediate products.

The Metalnomist Commentary

The narrowing NPI–class I nickel spread is not a sign of healthy convergence. It reflects class I oversupply on one side and cost-protected NPI on the other. The next shift will likely come from rising HPAL and MHP costs, not from a sudden recovery in nickel demand.