Copper vs Aluminum: Data Center Demand

The short answer: aluminum is the bigger metal by tonnage (74 vs 29 million tonnes), and copper costs about 4.5 times as much per tonne, so a year of copper is worth $426 billion against $240 billion for aluminum at the latest prices. Data centers take about 1% of aluminum and under 2% of copper. For the same electrical resistance, an aluminum wire weighs about half as much as copper and its metal costs about 11% of the copper wire's, but it needs 1.6 times the cross-section.

Educational only, not financial advice. Every structural figure carries its source, listed at the end. The wire comparison is our own calculation from standard handbook values, shown below. The snapshot table and the chart are refreshed about every six hours.

A snapshot, not a live quote: Yahoo Finance daily prices, each asset's latest bar dated (UTC) Copper 6 Oct 2026, Aluminum 6 Oct 2026. Refreshed about every six hours and last computed on 6 Oct 2026 at 20:25 UTC. Each price is the latest daily bar and each return runs to it. Price changes only, in US dollars, without dividends or fees. Futures are continuous front-month contracts, so a contract roll can show as a small step. Volatility is the standard deviation of daily moves over the past year, annualized. The highest close is from monthly history, not the intraday record. Not financial advice.

Sources and years are listed at the end. Copper and aluminum are priced in different units; the snapshot table converts copper to dollars per tonne so the two can be compared. The aluminum price is the COMEX futures contract and may differ from the London Metal Exchange price.

Replacing copper wire with aluminum wire that carries the same current is a trade between size, weight and price. This is the calculation, with standard handbook values:

The metal is only part of the cost. A fatter aluminum conductor needs larger conduits and connectors, and aluminum has a different thermal expansion and a surface oxide, so connections are designed differently. This is why aluminum is common in overhead transmission lines and power cable, and why copper stays in tight spaces and many connections.

• Primary aluminum 74 Mt
• Refined copper 29 Mt

U.S. Geological Survey, Mineral Commodity Summaries 2026. Aluminum is smelter production; copper is refinery production.

• Copper by 2030 (IEA, as reported) more than 0.5 Mt
• Aluminum at its peak (Wood Mackenzie) 0.6 to 0.9 Mt

Different publishers and different definitions. Wood Mackenzie says total system-level metals use, with the grid and on-site generation, is three to four times the volume inside the data center itself.

A line chart of what $10,000 invested five years ago would be worth today. The values are in the table above.

$10,000 invested five years ago would be worth: Copper: $15,222; Aluminum: $11,767. Price changes only, without dividends or fees.

Futures prices only, without fees. The aluminum series is the COMEX contract and its history can be shorter than five years, in which case that column and line are blank.

• Aluminum is the bigger metal by weight, and value depends on the price ratio. 74 against 29 million tonnes, but copper costs about 4.5 times as much per tonne, so a year of copper is worth $426 billion against $240 billion for aluminum.
• Data centers are a small customer for both. About 1% of aluminum output and under 2% of refined copper.
• They do different jobs inside the building. Aluminum is mostly cooling hardware and racking. Copper is the wiring and power distribution.
• The grid matters more than the building. Wood Mackenzie says the system-level use of metals, including transmission and on-site generation, is three to four times the volume inside the data center.
• Substitution runs both ways. High copper prices push designers toward aluminum for cable, while thermal and space limits can push back toward copper. The latest price ratio is the signal to watch.

For data centers, copper and aluminum are partners and rivals. Aluminum is the cheaper, lighter metal and the larger market by tonnage, and it dominates cooling and racking inside the building. Copper is the better conductor and carries the power, and each tonne of it costs several times as much. Each takes only a percent or two of world supply, and the bigger demand is in the grid around the building, where Wood Mackenzie sees three to four times the metal. When copper gets expensive relative to aluminum, cable and equipment designers look at switching, so the ratio in the snapshot table is worth a glance. Neither metal is mainly an AI story yet, and the snapshot table shows how each has traded, which is history, not a forecast.

See also Copper vs Silver, AI vs EVs and How AI Drives Metal Demand.

Do data centers use more copper or aluminum?

By the published estimates they are close, and both are small. Wood Mackenzie puts aluminum demand inside data centers at a peak of 0.6 to 0.9 million tonnes a year, and the IEA expects data centers to use more than half a million tonnes of copper a year by 2030. Against world output that is about 1% of the 74 million tonnes of primary aluminum and under 2% of the 29 million tonnes of refined copper. The two metals do different jobs: aluminum goes mostly into cooling and racking, copper into power wiring.

Can aluminum replace copper in data centers?

Partly. The US Geological Survey notes that aluminum substitutes for copper in power cable and electrical equipment, and that copper can also replace aluminum in electrical and heat-exchange uses. Aluminum conducts about 61% as well as copper, so a wire carrying the same current needs about 1.6 times the cross-section, but it weighs about half as much. Connectors, tight spaces and safety standards often keep copper in place.

How much cheaper is aluminum than copper?

Per tonne aluminum costs a fraction of copper, and the latest ratio is printed in this page's table. For the same electrical resistance an aluminum conductor weighs about 0.49 times as much as the copper one, so its metal cost is roughly the price ratio times 0.49, usually a small fraction of the copper conductor's metal cost. The metal is only part of the installed cost.

What is aluminum used for inside a data center?

Wood Mackenzie estimates that cooling systems take about 55% of the aluminum used inside data centers and racking and enclosures about 25%. The rest includes busbars, structural framing and other equipment. Aluminum's low weight, corrosion resistance and thermal conductivity suit heat sinks and cooling hardware.

Where does the world's aluminum come from?

China produced about 45 of the world's 74 million tonnes of primary aluminum in 2025, roughly 61%, according to the US Geological Survey. India made 4.2 million tonnes, Russia 3.9, Canada 3.3 and the United Arab Emirates 2.7. The United States produced 0.66 million tonnes and imposed a 50% tariff on most aluminum imports in 2025.

Which is the bigger market, copper or aluminum?

Aluminum is bigger by volume, about 74 million tonnes of primary metal against 29 million tonnes of refined copper in 2025. Which is bigger by value depends on the price ratio, because each tonne of copper costs several times as much as a tonne of aluminum. This page prints the value of each year's output at the latest price in its table.

Structural figures last checked on 5 October 2026.

• Aluminum smelter output, producers, tariffs, substitution: U.S. Geological Survey, Mineral Commodity Summaries 2026, Aluminum (February 2026).
• Copper output, producers, substitution: U.S. Geological Survey, Mineral Commodity Summaries 2026, Copper (February 2026).
• Aluminum inside data centers (0.6 to 0.9 million tonnes at peak, 55% cooling, 25% racking) and the system-level multiple of three to four: Wood Mackenzie, data centre metals demand isn't an asset story, it's a grid story (16 June 2026).
• Copper data center demand (more than half a million tonnes a year by 2030): IEA, as reported by U.S. Global Investors (December 2025).
• Conductivity and density: standard engineering handbook values, with copper's 100% defined by the International Annealed Copper Standard. Aluminum conductor alloys are about 61% of that, and densities are 2.70 and 8.96 g per cubic centimeter. The same-wire comparison is our calculation.
• Prices, returns, volatility and the chart: computed from Yahoo Finance daily prices (a snapshot refreshed about every six hours), as noted under the snapshot table.

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