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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteAluminium is the practical near-term alternative to copper in selected applications; carbon-nanotube conductors are promising for specialized, weight-sensitive uses but are not a drop-in replacement for bulk power wiring. The International Energy Agency’s 2025 outlook finds that existing and announced projects would meet about 70% of projected copper demand in 2035 under its Stated Policies Scenario. That implies a potential mined-supply gap of about 30% against that scenario’s demand—not a guarantee that buyers will be unable to obtain copper, and not evidence that the world is running out of the metal.
What a projected copper gap does—and does not—mean
The IEA’s 2025 outlook compares projected demand with supply from existing and announced mining projects. Its roughly 30% 2035 gap for copper in the Stated Policies Scenario is a warning about the project pipeline, not a prediction that exactly 30% of copper users will go without metal. The outcome depends on new mines and processing, recycling, efficiency, substitution, prices and demand.
This is a supply-development problem, not geological exhaustion. Mines take years to permit, finance, build and ramp up. Ore grades, water availability, energy costs and political or regulatory delays can also constrain output. Higher prices may encourage new production and scrap recovery, make substitutes more attractive, or curb demand; in practice, pressure may show up as price volatility, regional premiums, longer lead times or delayed projects rather than a uniform physical shortage. The IEA identifies copper as a major exception among energy-transition minerals where announced projects fall materially short of projected 2035 requirements in its analysis of copper supply and demand.
Demand is tied to grid expansion, renewable generation and storage, electric vehicles and charging, building electrification, industrial equipment, data centers and electronics. But copper intensity varies sharply: a high-voltage overhead line, a compact motor, an underground cable and a circuit board do not have the same requirements or substitution options. Copper remains hard to displace because it combines high electrical and thermal conductivity with ductility, corrosion resistance, manufacturability and well-established joining practices. The IEA discusses these roles in its overview of mineral requirements for clean-energy technologies.
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How aluminium compares with copper
Aluminium is already widely used in overhead power lines and also appears in some power cables, automotive systems, busbars and battery components. It is not a speculative material waiting for a breakthrough. Its lower density can make a conductor lighter, and its lower material cost can be attractive in suitable designs. But the comparison depends on the whole installation, not just the price of a kilogram of metal.
| Material or product | Electrical conductivity | Density | What the figures mean |
|---|---|---|---|
| Copper | 58 MS/m | 9.0 g/cm³ | DexMat’s August 2025 Galvorn data sheet comparison; figures are not a universal specification for every conductor product. |
| Aluminium | 33 MS/m | 2.7 g/cm³ | DexMat’s August 2025 comparison; alloy and finished-conductor properties vary. |
| Galvorn aligned CNT fiber | 10 MS/m | 1.6 g/cm³ | DexMat product data, not a figure for every carbon-nanotube material or cable assembly. |
Source for the table: DexMat’s August 2025 Galvorn data sheet. Conductivity in MS/m is a volume-based comparison: it describes conductivity per cross-sectional area. Aluminium’s lower conductivity means a larger cross-section is generally needed than copper for comparable resistance. Because aluminium is much lighter, the resulting conductor may still weigh less, but the extra volume can affect cable trays, conduits, clearances, bending radius, connectors, switchgear and installation work.
Where aluminium is most useful
- Overhead transmission and distribution: Aluminium is established, and lower weight helps on long spans. Composite-core designs can also improve line capacity or sag performance.
- Large cables and busbars: A larger conductor may be practical where there is room and the system can be designed for suitable terminals and thermal conditions.
- New vehicles and battery systems: Designers can account for conductor size and connector requirements from the outset. Aluminium already has uses in vehicle wiring and battery components, though electrochemical compatibility constrains which battery parts can use it.
- Some data-center power distribution: Stationary installations may accommodate aluminium busways or conductors, subject to space, thermal design, facility standards and joint reliability.
Why aluminium needs careful engineering
- Joints and oxide: Aluminium forms an electrically insulating oxide layer. Rated terminals, proper preparation and compatible connectors are essential.
- Creep and thermal expansion: Sustained heat and mechanical loading can affect contact pressure, so connections must be designed for the material’s behavior over time.
- Galvanic corrosion: Direct copper-aluminium contact in damp conditions can cause corrosion; suitable bimetallic connectors and environmental protection are needed.
- Space and installation: A copper cable cannot simply be swapped for an aluminium one of the same dimensions. Conductor size, insulation, supports, termination and thermal design may all change.
- Codes and retrofit constraints: Building wiring has demanding safety and installation requirements. Large conductors may be appropriate in some settings, while small branch circuits or retrofits can be unsuitable or uneconomic.
Aluminium is therefore strongest in applications designed around it, especially overhead lines and larger conductors. Copper often remains preferable where space is tight, small or highly flexible conductors are needed, compact connections matter, or existing equipment and certification are built around copper. A lower metal price does not automatically mean a lower installed-system cost.
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What carbon-nanotube conductors can do today
“Carbon-nanotube conductor” can mean a yarn, aligned fiber, film, tape, metal composite or structural reinforcement. These are different products. A measurement on an individual nanotube does not establish the price, durability, joining performance or manufacturability of a finished cable.
Galvorn, a commercial aligned-CNT material from DexMat, provides a concrete example. Its August 2025 data sheet reports 10 MS/m conductivity and a density of 1.6 g/cm³, compared with 58 MS/m and 9.0 g/cm³ for copper. DexMat says Galvorn’s conductivity by volume is about one-sixth of copper’s and one-third of aluminium’s in its product FAQ. A CNT fiber can look competitive on conductivity per unit mass because it is so light, while still requiring much more cross-sectional area to carry current at a given resistance. Those are different engineering comparisons.
Potentially good fits for CNT materials
- Aerospace and aviation: Lower mass, flexibility, strength and shielding can be valuable enough to justify a higher-cost material. DexMat describes these potential uses in its aerospace cable overview.
- EMI shielding: CNT films or braids may reduce shielding mass. DexMat reports a demonstration in which a CNT cable assembly was more than 50% lighter than a comparable copper-braid assembly; that is a company-reported, application-specific demonstration, not a general performance guarantee. See its EMI-shielding application page.
- Signal and data cables: Some designs may value flexibility, low mass or corrosion resistance more than minimum DC resistance. DexMat reported an October 2025 Ethernet cable demonstration using a 500-micrometer CNT yarn and said the replaced copper wire was more than 80% lighter. This is a company demonstration, not proof that CNT cable generally outperforms copper Ethernet cable. See DexMat’s demonstration report.
- Composite overhead conductors: CNT material may work as a reinforcement rather than as the main conductor. DexMat and Prysmian are developing aluminium–CNT transmission cables in which CNT material replaces steel or carbon-fiber reinforcement. The development is described at DexMat’s energy-transmission page; it does not establish broad commercial deployment.
In the composite-conductor approach, the CNT’s role is to support mechanical performance while aluminium carries current. That could help address weight, strength or sag constraints without replacing the current-carrying metal altogether.
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Why CNTs are not a bulk-copper replacement
For conventional power wiring, today’s CNT products face several barriers at once:
- Lower conductivity by volume: The published Galvorn figure is well below both copper and aluminium. A bigger cross-section may be incompatible with compact equipment and existing infrastructure.
- Scale and cost: Producing long, uniform, aligned conductor material at commodity scale and price is difficult. DexMat announced a 20-fold production-capacity increase in January 2024, but that company announcement does not show copper-like global production volumes or prices: DexMat’s announcement.
- Terminations and integration: A cable also needs reliable terminals, splices, insulation and shielding, and compatibility with manufacturing equipment. DexMat’s film product page describes integration using copper ferrules or electroplating, illustrating that metal interfaces may still be part of a CNT assembly: Galvorn film details.
- Qualification and service life: Utilities and industrial buyers require evidence for ampacity, thermal aging, short-circuit performance, fatigue, environmental exposure, repairability and connector reliability. A promising material still has to qualify as a complete system.
- Application-specific economics: CNT materials make the strongest case where weight, strength, flexibility, corrosion resistance or shielding are valuable enough to outweigh higher material and integration costs. They are a poor fit for low-cost bulk distribution when copper-like conductivity per volume is required.
DexMat’s figures are vendor-published product data, useful for understanding its material but not independent validation across all CNT products. Product form and measurement basis matter: a fiber, film, yarn and finished cable should not be treated as interchangeable.
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Which conductor fits which application?
| Application | Most established fit | Where alternatives may help | Main constraint |
|---|---|---|---|
| Overhead transmission | Aluminium conductors | Composite cores, including CNT-reinforced development designs, may improve mechanical performance. | Line design, sag, clearances, qualification and corridor constraints. |
| Underground distribution | Copper or application-specific aluminium | Aluminium can suit larger conductors and planned installations. | Conduit space, joints, thermal design and installation requirements. |
| Building wiring | Copper is common, especially for smaller conductors | Aluminium may suit selected large conductors where code and termination requirements are met. | Safety rules, connectors, retrofit conditions and physical space. |
| EV harnesses and busbars | Copper, with aluminium already used in some designs | Aluminium can reduce mass in redesigned systems; CNTs may suit specialized flexible or weight-critical connections. | Packaging, current, connector reliability and vehicle-specific qualification. |
| Battery current collectors | Material choice depends on electrode chemistry; aluminium is already used on the positive side of lithium-ion cells. | Further substitution depends on electrochemical compatibility and manufacturing process. | Cell chemistry and production requirements. |
| Data-center power distribution | Copper or aluminium, depending on system design | Aluminium may suit stationary busways and conductors; CNT signal cables are a separate, specialized possibility. | Space, thermal limits, connectors and facility standards. |
| Aerospace wiring and EMI shielding | Copper is established | CNT fibers, films or braids may offer weight, flexibility or shielding advantages. | Cost, qualification and finished-assembly performance. |
| Motors and transformers | Copper is often favored where compactness and conductivity per volume matter | Aluminium is possible in some designs. | Size, heat, winding and connection design. |
| Flexible electronics and specialized cables | Depends on the current, geometry and service environment | CNT films or yarns may suit low-mass, flexible or multifunctional designs. | Resistance, contacts, durability and product-specific qualification. |
This is a qualitative application guide, not a universal ranking. The choice depends on the required current and resistance, dimensions, mass, thermal limits, mechanical loading, service life, joining method and cost of failure.
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What else can ease pressure on copper?
Material substitution is only one part of the response. The IEA’s outlook points to a combination of new supply and demand-side measures, including recycling, material efficiency, substitution and innovation.
- Upgrade conductor and grid design: Advanced aluminium and composite-core lines can increase capacity on existing routes, where thermal limits, sag, tower strength or permitting make building new corridors difficult.
- Use efficient transmission where appropriate: The IEA identifies broader HVDC use as one way grid design can reduce combined copper and aluminium requirements in modeled scenarios. The benefit depends on the system and route, not on a universal replacement rule.
- Recover more scrap: Copper is recyclable, but collection, sorting and contamination limit recovery. Much of the metal is tied up in long-lived buildings, vehicles, cables and machinery, so recycling cannot instantly supply all additional demand during electrification.
- Reduce material intensity: More efficient motors and transformers, higher-voltage distribution, better power electronics, reuse of existing corridors and improved load factors can deliver services with less conductor material.
- Build mines and processing capacity: Substitution does not remove the need for copper investment where copper remains the best technical or economic choice.
Aluminium substitution also shifts some demand toward aluminium, whose production is energy-intensive and has its own power, emissions and supply-chain constraints. No single material removes the need to evaluate the whole supply system.
How to judge a conductor substitution
Comparing materials by conductivity alone can produce the wrong answer. Engineers and buyers should assess the finished system against the same requirements:
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- Resistance and ampacity at the required current, including thermal and short-circuit limits.
- Cross-sectional area, mass per length, allowable bend radius and available installation space.
- Mechanical strength, sag, creep, vibration and flex life.
- Connector, splice and termination reliability, including corrosion and maintenance.
- Fire behavior, environmental exposure, expected service life, repairability and recyclability.
- Total installed cost: material, cable, connectors, tooling, labor, qualification, maintenance and the consequences of downtime or failure.
- Supply availability, supplier diversity, standards compatibility and ability to scale on the project’s timeline.
For CNT products in particular, ask whether the quoted property applies to a nanotube, yarn, film, composite or finished cable; whether conductivity is stated by volume or by mass; and whether performance has been demonstrated in the intended assembly. For aluminium, confirm conductor alloy and rating, terminal compatibility, installation requirements and applicable local standards. Compare new-build designs separately from retrofits: redesigning a new aircraft or data center is much easier than changing legacy equipment.
Verdict: aluminium first, CNTs for selected niches
Aluminium is the credible near- and medium-term substitute where a larger conductor and redesigned connections are acceptable, especially in overhead transmission and some large cables, busbars and vehicle systems. Carbon nanotubes may earn a place in applications that reward low mass, flexibility, strength, shielding or structural integration, but current product data does not support treating CNT fibers as an imminent, cost-effective replacement for bulk copper power wiring. The likeliest response to copper supply pressure is a mix of selective aluminium substitution, efficiency, recycling, improved grid design and new copper supply—not one miracle conductor.
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