Copper prices hit a record high earlier this year, and the gap between copper and aluminum costs remains wide. The copper-to-aluminum price ratio is currently around 4.2, meaning copper costs more than four times as much as aluminum for the same weight. That price difference is pushing manufacturers—from luxury carmakers to power grid operators—to redesign their products and use more aluminum instead of copper.
Both metals conduct electricity, but aluminum is cheaper and lighter. According to Reuters, aluminum costs roughly a quarter of copper but is only about 61% as conductive. That means an aluminum cable must be thicker to carry the same current. However, industry sources told Reuters that once the price ratio rises into the 3.5 to 4.0 range, the savings from switching start to outweigh the redesign costs. The market is now above that threshold, making the shift economically attractive.
Automakers Lead the Charge
For car manufacturers, weight is a second major incentive. Copper is about 3.3 times heavier than aluminum, so swapping materials can reduce vehicle weight and, for electric vehicles, potentially extend driving range. Ferrari told Reuters it began using aluminum wiring on its 296 model last year, cutting wiring weight by 15% to 20%. BMW said aluminum conductors have expanded to “a large number” of cables across both high- and low-voltage systems since the launch of its sixth-generation eDrive technology last year.
This trend is not limited to high-end sports cars. As copper prices stay elevated, more automakers are likely to follow suit, especially in the electric vehicle segment where every kilogram of weight savings can improve battery range. The shift is gradual—retooling production lines takes time—but the direction is clear.
Utilities and Appliance Makers Join In
The switch is also happening in other industries. Reuters reported that Energy Queensland, a grid operator in Australia, is replacing copper with aluminum across a 210,000-kilometer distribution network as equipment ages. Appliance and HVAC makers like Daikin are pursuing similar savings. For utilities, the cost advantage of aluminum is particularly compelling for long-distance power lines and distribution networks where weight and material costs matter.
The broader context is that global spending on power grids is expected to surge. French cable maker Nexans estimates the world could spend about €10 trillion on power grids by 2030. That sounds like an automatic tailwind for copper demand, but the shift to aluminum could change the equation. If the copper-to-aluminum ratio stays above the switching zone, utilities and original equipment manufacturers can rewrite cable specifications toward aluminum in parts of the network that don’t need copper’s top-end conductivity.
What It Means for Investors
For investors, this trend has implications for commodity markets and specific companies. The payoff from grid spending may show up differently than many expect: more aluminum content per project and weaker incremental copper intensity. Italian cable maker Prysmian says its mix is now about 40% aluminum by weight, up three percentage points over five years. That hints at a slow-but-steady shift in the inputs behind electrification.
Copper miners and aluminum producers will be affected differently. While copper demand is still strong for many applications, the substitution effect could cap price gains in the long run. Aluminum producers, on the other hand, may benefit from increased demand as more industries switch. However, the transition is gradual—redesigning components and getting regulatory approvals takes years, not months.
Investors should also watch the copper-to-aluminum price ratio. If it stays above 4.0, the substitution trend will likely accelerate. If copper prices fall, the incentive to switch diminishes. For now, the ratio remains favorable for aluminum, and companies like Ferrari, BMW, and Energy Queensland are already making the change.
For more on commodity price trends, see our coverage of Aluminum Prices Hit Four-Month Low as Strait of Hormuz Tensions Ease. And for broader market context, check Treasury Yields Edge Up as Oil Price Gains Stoke Inflation Concerns.
