Aluminium: power contracts upstream, alloy discipline downstream

Smelting is a power contract with a plant attached

Reducing alumina electrolytically consumes electricity continuously, and the cell line cannot simply be switched off without severe damage, so smelters are located where long-term power is secure and competitively priced. That places them near hydro, nuclear or dedicated generation, often under contracts running for decades. It also makes them acutely exposed to electricity market reform, grid charges and emissions policy. When a smelter closes, it is almost never because the equipment failed; it is because the power arrangement that justified building it no longer exists on acceptable terms. Reading that power agreement tells an investor more than any tour of the potrooms.

Recycled metal changed the industry's centre of gravity

Remelting aluminium requires a small fraction of the energy that primary production does, so secondary producers can operate close to their customers and respond to demand rather than running flat out. The constraint is alloy control: mixed scrap accumulates elements that cannot be removed economically, so sorted streams and reliable analysis determine which alloys can be produced. This has made scrap sorting technology and supply arrangements genuinely strategic, and it explains why downstream users are increasingly asked to design for alloy separability rather than just for weight. It has also turned proximity to a dependable scrap catchment into a location factor in its own right, much as power availability is upstream.

Extrusion lives on dies, billet and press availability

An extruder heats a billet and forces it through a die, so capacity is set by press size and by how quickly dies can be changed and profiles run. Dies are relatively inexpensive compared with moulds in other processes, which encourages bespoke profiles, but each new die needs trialling and correction before it runs to tolerance. Billet is bought at a metal reference plus a regional premium that moves independently, so extruders quote metal separately from conversion. Buyers who negotiate only the conversion element have negotiated the smaller number. Die development terms deserve as much attention in negotiation as the conversion rate itself.

Rolled products serve customers who audit everything

Sheet, plate and foil go into packaging, transport, building and aerospace, each with distinct expectations. Can stock demands consistent gauge and formability at high speed; aerospace plate demands documented alloy chemistry, mechanical properties and full traceability; foil demands pinhole control and surface cleanliness. Rolling mills are capital-heavy and reward long campaigns of similar gauge and alloy, which conflicts with customers wanting variety. The commercial art is holding a product portfolio that keeps the mill loaded without accepting so much variety that campaign efficiency collapses. Buyers in these segments should establish early whether their alloy and gauge fit an existing campaign or would need one created for them.

Where the chain is fragile

Upstream fragility is energy and policy: a change in power pricing or emissions treatment can render a smelter uncompetitive while the plant is still perfectly serviceable. Downstream fragility is different, resting on construction and vehicle demand cycles, on the regional premium moving against contracted positions, and on trade measures that periodically reshape import flows. Both ends share exposure to alloy specification changes as customers pursue recyclability. Anyone assessing an aluminium business should first establish where in the chain it sits, then examine the exposure that actually applies there. Applying upstream reasoning to a downstream extruder produces confident conclusions that are simply wrong.

Frequently asked questions

Why is aluminium priced as metal plus a premium plus conversion?

Because the three elements move for different reasons. The metal reference reflects a global exchange-traded price. The regional premium reflects the cost of getting physical metal to a particular location, including freight, duties and local supply balance, and can move sharply on its own. Conversion covers the extruder's or roller's processing, tooling and overhead. Separating them lets both parties hedge or index what they can, and prevents a supplier carrying metal risk it has no way to manage.

Is recycled aluminium suitable for our application?

Usually, provided the alloy specification can be met. Remelted metal is chemically the same element, and the question is whether accumulated alloying and residual elements sit within the range your application allows. Casting alloys tolerate more variation than wrought alloys, and some demanding aerospace or bright-surface applications require tightly controlled chemistry. Specify the alloy and any element limits explicitly, ask for chemical analysis per batch, and test a production quantity before committing a design.

What determines the lead time on a custom extruded profile?

Die manufacture and correction come first, since a new profile rarely runs to tolerance on the initial trial and may need several iterations. After that, lead time depends on press availability for the required size and on billet supply in the specified alloy. Anodising or powder coating adds another step and often another supplier. Ask the extruder to quote die development separately from production, and to state how many trial attempts are included before further charges apply.