Indonesia policy uncertainty and tighter supply support coal, nickel and aluminum prices

Overview

This report summarizes the key conclusions from UBS’s Indonesia-China commodity research covering coal, nickel, aluminum, and alumina markets. Through engagements with Indonesian coal, nickel, and aluminum companies, Chinese coal experts, seaborne coal traders, and aluminum industry experts, the report judges that the main 2026 commodity market contradictions are concentrated in Indonesian policy and quotas, supply-side constraints, upward shifts in cost curves, and changes in China demand. Overall, coal and aluminum are more supply-tight, while nickel is in a tug-of-war between cost support and policy uncertainty.

Core views

For coal, the Indonesian government intends to increase coal quotas to capture some of the upside from higher prices, but higher domestic-market obligations could suppress exports, and tighter seaborne lower-to-mid calorific-value coal supply on China’s coast makes the 2026 China coal market even tighter. For nickel, Indonesian RKAB quotas may increase in July 2026; the current 260-270m wmt quota is below estimated demand of about 300m wmt, while the new HPM mechanism raises laterite ore costs and provides support near US$18,000 for nickel prices. For aluminum, Indonesian capacity is expanding steadily, but the global market has moved into a relatively tight phase due to overseas cutbacks and limited incremental capacity; experts expect a roughly 1.5mt primary aluminum shortage in 2026, with a relatively strong price outlook. By contrast, alumina is under pressure as China’s capacity rises and supply is more ample.

Analysis framework

The report uses a research-note approach, combining management discussions with companies, industry expert views, and trader feedback, and cross-validating around policy quotas, supply-demand balance, cost shifts, inventories, trade flows, and price expectations. The coal section compares Indonesia export changes, China power and coal-to-chemicals demand, port inventories, and summer restocking patterns. The nickel section focuses on RKAB, HPM, HPAL feed costs, sulfur supply, and MHP cutbacks. The aluminum section integrates global shutdowns, incremental capacity, China demand, exports, and alumina supply-demand to form conclusions.

Methodology notes

• Supply-demand analysisCommodity supply-demand balance analysis

  Assesss price direction based on production, exports, inventories, demand, and policy variables.

  The report incorporates declining Indonesian coal exports, rising China coal-power demand, global aluminum shutdowns, and Indonesian nickel quota gaps into a supply-demand framework, concluding that coal and aluminum are relatively tighter.

• Policy analysisIndonesia resource policy and quota tracking

  Track the impact of RKAB, DMO, HPM, export taxes, and windfall taxes on supply and costs.

  The report emphasizes that Indonesian authorities have a clear revenue-increase intent, but execution speed is slower; policy pathways will affect coal exports, nickel ore supply, and HPAL raw material costs.

• Price and cost analysisCost support and price-range assessment

  Infer price support levels and upside by considering input costs, marginal supply, inventories, and seasonal demand.

  The report argues that the new HPM mechanism lifts nickel feed costs and supports nickel prices around US$18,000, while aluminum prices are supported by global shortage and may push LME aluminum above USD4,000/t.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• Coal

  Benefits from Indonesian quota uncertainty, better-than-expected China demand, and relatively low inventories.

  Strengths

  Seaborne low-to-mid calorific-value coal supply is tightening, while China coal power and coal-chemicals demand are stronger than expected; summer restocking provides support.

  Weaknesses

  Indonesia may raise quotas, and higher hydro and renewable utilization may restrain coal demand.

  Comparison

  Compared with prior years, Indonesian policy on the supply side and seaborne coal tightness are more pronounced in 2026.

  Risks

  Weak power demand, limited coal price pass-through, rising fuel costs, and faster renewable-energy substitution.

• Nickel

  The new HPM price mechanism and sulfur shortages provide cost support for nickel.

  Strengths

  HPAL feed costs are rising, short-term supply may tighten through MHP curtailments, and stronger EV demand could add upside risk.

  Weaknesses

  RKAB quotas may increase, and imports from the Philippines plus inventories can partly fill the gap, though structural pressure from capacity expansion remains in the long term.

  Comparison

  Compared with coal and aluminum, nickel’s trajectory depends more on policy implementation and supply discipline, giving it lower certainty.

  Risks

  Excessive capacity expansion, supply expansion from technology upgrades, weak stainless-steel and battery demand, and EV supply-chain disruptions.

• Aluminum

  Global supply tightness supports aluminum prices, while Indonesian capacity expansion still needs close monitoring of power and execution risks.

  Strengths

  Large-scale overseas cutbacks, limited new capacity, China export demand supported by overseas gaps, and upside room for LME aluminum.

  Weaknesses

  Chinese property, photovoltaic and auto demand is slowing at the margin, and Indonesian projects may face power constraints.

  Comparison

  Aluminum benefits more from tightness at the smelting end than alumina does; alumina is pressured by China supply surplus.

  Risks

  Weak property and infrastructure demand, weaker export order book, slower-than-expected renewable installations, and changes in policy or power constraints.

• Alumina

  Loose supply keeps prices under pressure, but low-cost producers still have earnings resilience.

  Strengths

  Nanshan Aluminium International has 4mtpa alumina capacity in Indonesia and a bauxite cost advantage.

  Weaknesses

  China alumina is expected to have a roughly 4mt surplus in 2026 as new capacity keeps coming online.

  Comparison

  In contrast to primary aluminum supply shortage, alumina is structurally more surplus-oriented.

  Risks

  If Guinea bauxite quota policy is enforced more strictly, costs and prices may rise.

Key data

• Indonesian coal exports to ChinaEstimated year-on-year decline of about 10-30mt in 2026China coal experts and traders believe this will tighten coastal low-to-mid calorific-value coal supply.
• Original RKAB target for Indonesian coal600mnGiven ICI 3-4 prices are up 25-30% year-to-date, the government may allow higher quotas.
• China QHD5500 price outlookRMB750-850/t, with summer peaks possibly above RMB900/tTraders expect around RMB750/t, while coal experts estimate around RMB800-850/t.
• China coal power generation2026 first-quarter year-on-year growth of 3.7%Coal consumption outperformed expectations; coal-chemicals demand rose by about 10%.
• Current Indonesian nickel RKAB quota260-270m wmtExperts estimate nickel ore demand at around 300m wmt, leaving a gap of 30-40m wmt.
• Nickel price support levelUS$18,000The new HPM mechanism raises laterite ore costs and supports the nickel price.
• Expected MHP curtailmentAbout 40% in May-June 2026Drivers include sulfur shortages and rising sulfur prices.
• Alamtri Minerals aluminum smelting capacity500ktpaCommercial operations began in December 2025; all 372 reduction pots are expected to be running by October 2026.
• Expected Indonesian aluminum smelting capacityCurrently around 1.75mtpa, around 4mtpa by 2028, potentially around 6mtpa by 2030ADMR’s outlook is broadly in line with UBS expectations.
• Global primary aluminum supply-demandAround 1.5mt shortage in 2026EOverseas cutbacks of about 3.6-4.0mt, with limited new builds and restarts.
• LME aluminum price expectationCould break through USD4,000/t in 2026Expert view; SHFE aluminum expected in the RMB24,000-29,000/t range.
• China alumina supply-demandAround 4mt surplus in 2026Increasing capacity and additional inflows under Middle East smelter disruption are keeping alumina prices under pressure.

Impact & implications

The report implies that key pricing drivers for resource commodities in 2026 are not only on the demand side, but also on policy constraints, export availability, cost curves, and overseas supply shocks. For coal, uncertainty around Indonesian exports and China summer restocking can lift price floors; for nickel, HPM and sulfur shortages raise cost support, while quota increases could ease tightness; for aluminum, global shortages and overseas supply gaps support upside, while alumina surplus may shift profits further toward the electrolytic aluminum segment.

Risks

• Coal demand weaker than expected, especially in the power segment.
• Stricter electricity pricing regulation may limit downstream transmission of coal cost changes.
• Higher hydro and renewable utilization may substitute coal consumption.
• Uncertainty around Indonesian coal quotas, DMO, export taxes, windfall taxes, or oil-and-gas-style regulatory mechanisms.
• Nickel supply may remain oversupplied due to capacity expansion and technology upgrades.
• Weaker-than-expected stainless steel, battery, or EV demand would weigh on nickel prices.
• Aluminum demand may weaken due to slowdowns in property, infrastructure, export orders, and photovoltaic installations.
• Indonesian aluminum projects may face power constraints and execution delays.
• Persistent alumina supply surplus may continue to pressure prices.

What to watch

• The approval pace and final scale of Indonesian coal RKAB quotas in June-July 2026.
• Whether Indonesian coal DMO rises from 25% to 30%, and its actual impact on export volumes.
• Whether Indonesia introduces a coal export tax, windfall tax, or oil-and-gas-style regulatory mechanisms.
• China coastal coal inventories, the intensity of summer restocking, and hydro and renewable output.
• Whether QHD5500 can hold above RMB750-850/t and break through RMB900/t in summer.
• Whether Indonesian nickel RKAB increases in July 2026 and how the 30-40m wmt gap is filled.
• Whether the new HPM mechanism actually lifts laterite ore transaction prices and HPAL costs.
• Sulfur prices and supply, and whether MHP curtailment reaches around 40%.
• The ramp-up progress of Alamtri Minerals’ smelting pots and whether full-load costs can reach about US$2k/t.
• Global aluminum cutbacks, new Indonesian capacity, power constraints, and changes in China export orders.
• The enforcement intensity of Guinea bauxite quota policy and its impact on alumina prices.