How El Niño Is Hitting Copper From Two Sides at Once

One climate event is doing two opposite things to the world’s copper supply at once. In South America it is drowning mines under record rainfall. In the African Copper Belt it is draining the reservoirs that generate the electricity those mines run on.

That is not two separate supply problems. It is a single, compounding shock landing on a market that was already stretched thin, and the regions involved are not marginal players.

South America and the African Copper Belt together account for roughly half of global copper output. This El Niño is tracking toward historic intensity: the U.S. Climate Prediction Center (CPC) now places greater than 90% odds on a very strong event persisting through the northern hemisphere fall and winter of 2026-27, and roughly 69% odds on an October-December peak of historic strength. The market has noticed. LME cash copper settled at $14,540 per tonne in early September 2026, up roughly 30% year-on-year.

What follows here maps the structure of the disruption rather than just cataloguing the damage. Understand the two-mechanism setup, read the conflicting market-balance signals correctly, and track what producers are actually doing, and you will be better placed to judge whether current prices reflect the supply risk or have run ahead of it.

A climate event engineered to hit copper from both sides

El Niño does not disrupt the weather uniformly. It reshapes global precipitation patterns in region-specific ways, which is precisely why the same event can produce flooding in one copper geography and drought in another. The mechanism is opposite, but the outcome for supply is the same: production comes offline.

That geographic split is what makes this cycle analytically different from a straightforward weather disruption. This is not a single region having a bad year. It is two of the world’s three most important copper regions being hit simultaneously through unrelated channels.

Copper is not the only market repricing under this pressure cycle; commodity market volatility driven by the 2026 El Niño event is reshaping agricultural, energy, and metals pricing across multiple geographies simultaneously, which complicates any single-commodity supply narrative.

The two mechanisms break down cleanly:

• South America (Chile and Peru): Excess rainfall, flooding, landslides, and port closures directly halting or slowing mine operations and logistics.
• African Copper Belt (Zambia and DRC): Drought draining hydroelectric reservoirs, cutting the electricity that hydro-dependent mines rely on to operate.

The intensity trajectory raises the stakes further. CPC’s updated data suggests this event is not fading into the second half of 2026 but potentially strengthening, with that roughly 69% probability of an October-December peak at a three-month relative Niño-3.4 index (RONI) of +2.5°C or above, a threshold that would rank the event among the strongest in recorded observation.

CPC’s ENSO diagnostic discussion details the sea surface temperature anomaly data and RONI methodology underpinning the greater than 90% probability assessment, providing the primary observational basis for intensity forecasts that copper supply models now need to treat as a standing input rather than a scenario.

The most important number here is not about this event at all. It is about every event that follows it.

Wood Mackenzie’s structural revision Wood Mackenzie estimates that baseline annual mine-supply disruption assumptions need to rise from 5% to 6%, permanently removing an estimated 250,000-300,000 tonnes from the market every year because of increasingly volatile weather.

That revision tells you climate volatility is no longer a tail risk to be discounted in supply models. It is a permanent structural headwind that belongs in any forward assessment of copper supply, this cycle and beyond.

South America underwater, Africa in the dark

The two regional stories, read in sequence, reinforce the point rather than restating it.

In Chile, the world’s leading copper producer, some regions received more rain in a single day than they typically see in an entire year. The human and economic toll has been severe: at least 10 fatalities and potentially hundreds of millions of dollars in losses. Sections of the Pan-American Highway closed under landslides and flooding, and the Huasco and Coquimbo export ports shut temporarily because of hazardous sea conditions.

The production numbers followed. Cochilco, the Chilean Copper Commission, cut its national 2026 forecast to 5.27 million tonnes, a 2.6% decline from 2025 and roughly 30,000 tonnes below its May projection.

State-owned Codelco went further, formally withdrawing its 1.34 million-tonne production target on 13 August 2026, abandoning the 1.331-1.357 million tonne range it had set only in March.

Peru presents a different risk profile. The government declared a 60-day state of emergency on 2 July 2026 covering 796 districts, yet core mining operations have so far avoided direct production hits. The pressure there is on the logistics chain, ore transport, materials delivery, and shipping schedules, which is the more relevant risk to watch: production intact, but the routes to move it under strain.

The African Copper Belt’s power calculus

The African story runs on electricity, not water for processing. Mines across Zambia and the Democratic Republic of Congo (DRC) draw heavily on hydroelectric power, so when drought lowers reservoir levels, the shortfall arrives as blackouts rather than as a shortage of process water. Zambia is currently experiencing widespread national outages.

The clearest evidence of what that means sits at the operator level. Ivanhoe and Zijin cut Kamoa-Kakula’s 2026 guidance from roughly 600,000 tonnes to 290,000-330,000 tonnes of copper anode, a near-halving driven by power supply issues, hydrological constraints, and earlier seismic activity, with the operation drawing about half its electricity from the DRC’s hydro-dependent grid.

CMOC Group told a different story. Its TFM and KFM mines rely on the same hydro-vulnerable grid, yet CMOC held guidance at 760,000-820,000 tonnes, reported H1 2026 output of roughly 388,000 tonnes (up around 10% year-on-year), and declared no force majeure, leaning on waste heat recovery and diesel reserves.

The gap between the two is not luck. It is contingency infrastructure, built before the drought arrived. JCHX Mining’s heavy diesel pre-stocking for its DRC operations reflects the same short-term logic. That divergence tells you the African power crisis is not a uniform catastrophe but a function of preparation, which means producer-level exposure matters far more than any regional headline.

The gap between CMOC’s maintained guidance and Kamoa-Kakula’s near-halved output illustrates precisely what climate resilience frameworks are designed to capture: the difference in outcomes between operations that modelled weather scenarios in advance and those that did not.

What the market data actually shows about concentrate tightness

Here the signals contradict each other, and the contradiction is the story.

On paper, the refined copper market is not short. The International Copper Study Group (ICSG) revised its 2026 forecast in April from an expected 150,000-tonne deficit to a projected surplus of roughly 96,000 tonnes. Q1 2026 preliminary data showed an apparent global refined oversupply of about 396,000 tonnes, up sharply from around 135,000 tonnes in Q1 2025.

Now the other signal. At the raw materials stage, availability is acutely tight.

The concentrate stress signal Spot treatment charges (TC) for imported copper concentrates plunged to -$146.15 per tonne for the week ending 17 July 2026. Treatment charges are what smelters earn to process concentrate into metal, so a deeply negative figure means smelters are effectively paying for the raw material, a sign of severe scarcity at that stage.

Both things are true at once. There is enough refined metal on paper, and the pipeline feeding it is under genuine strain. Refined production growth is slowing to just 0.9% in 2026, down from 3.4% in 2025, which narrows the buffer between adequate and short.

The concentrate supply shortage feeding those deeply negative treatment charges is not a new phenomenon triggered purely by El Niño; it reflects a multi-year structural undersupply of mine-stage raw material that weather disruptions are now accelerating rather than creating.

The price data sits alongside that tension:

• LME cash copper: $14,540 per tonne (early September 2026)
• Three-month price: approximately $14,448 per tonne
• LME warehouse stocks: approximately 234,000 tonnes
• Year-to-date average: approximately $12,947 per tonne, up 30% on the 2025 average

What this tells you is to be cautious with headline deficit-or-surplus narratives. The refined surplus is real, but so is the concentrate tightness, and El Niño disruptions landing through the second half of 2026 will test whether that raw-material pipeline can absorb any more pressure without cracking.

How producers are bridging the gap between diesel and decade-long infrastructure

The response is real, but the timelines tell the story. What producers can deploy now buys months. What actually fixes the structural problem takes years.

Diesel generation is the dominant immediate fallback, expensive to run and understood by operators as a bridge, not a cure. CMOC’s diesel reserves and JCHX Mining’s pre-stocking are the clearest examples of that short-term logic in action.

The three-tier response horizon looks like this:

1. Immediate (months): Diesel-powered generation. High operating cost, deployed now. Example: CMOC diesel reserves, JCHX Mining pre-stocking.
2. Medium-term (years): Self-generated renewables. Example: CMOC integrating photovoltaic solar into long-range planning, no confirmed commissioning date.
3. Long-term (2028-2029): New dedicated hydropower. Example: Tengyuan Cobalt’s planned 100 MW station, not expected online until 2028-2029.

That final line matters most. If new hydropower capacity does not arrive until 2028-2029, then this El Niño cycle, and quite possibly the next one, will play out in full before African Copper Belt producers can break their dependence on the very grids failing them now. Diesel is not a temporary anomaly in that cost structure. It is a feature of the near-term economics.

What history says about the recovery curve

The 2015-2016 El Niño offers the closest comparison. Massive storms flooded northern Chile’s Atacama and southern Peru, curtailing or halting activity at major operations, and the disruption was sharp but temporary.

In total, those events knocked out roughly 90,000 tonnes of copper output, about 0.5% of global supply at the time. IMF and Dallas Fed research put the immediate hit to output growth at approximately -0.2 percentage points, with production normalising within weeks to months once weather stabilised and infrastructure was repaired.

One difference changes how that precedent should be read. With Wood Mackenzie’s baseline disruption assumption now revised up to 6%, the market’s capacity to absorb a temporary shock is lower than it was in 2015-2016. The same weather event lands on a thinner cushion.

What this cycle changes for copper supply reliability

Strip away the individual events and one conclusion holds. This is not a weather disruption layered onto a healthy market. It is a stress test exposing structural weaknesses that will outlast the weather itself.

The combined flood risk in South America and power risk in Africa reveals something more durable than any single event: copper mining’s geographic concentration in climate-vulnerable regions is itself a supply-chain risk. That vulnerability does not disappear when this El Niño fades.

Supply chain disruption risks in copper extend across logistics, port operations, and refinery throughput in ways that aggregate weather-driven shocks with pre-existing structural fragilities, and that combined exposure is what makes Wood Mackenzie’s revised baseline disruption assumption analytically significant.

The near-term picture is not softening either. CPC’s roughly 69% odds on a historic-intensity October-December peak suggest the disruption window may be widening rather than closing, with Chile’s forecast already trimmed to 5.27 million tonnes and LME warehouse stocks sitting at just 234,000 tonnes.

For monitoring how this develops, four indicators do the heavy lifting:

• CPC RONI index updates: Confirm or downgrade the historic-intensity peak probability.
• Cochilco monthly production reports: Track whether Chilean output falls further than the 5.27Mt forecast.
• LME warehouse stock movements: Falling stocks signal tightening ahead of price moves.
• Spot TC trends: A further slide below -$146.15 signals the concentrate pipeline tightening again.

For anyone with copper exposure through equities, commodities, or supply-chain positions, the October-December CPC update is the single most important near-term data point. A confirmed historic-intensity peak would remove any early ceiling on disruption and stretch the supply-pressure timeline into 2027.

The structural takeaway Wood Mackenzie’s revised 6% disruption baseline permanently removes an estimated 250,000-300,000 tonnes per year. That is the part of this story that stays after the rain stops and the reservoirs refill.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results. Financial projections are subject to market conditions and various risk factors, and forward-looking statements are speculative and subject to change based on market developments.