The electrolytic process used to smelt all commercial primary aluminum, invented simultaneously by Charles Hall and Paul Héroult in 1886 and essentially unchanged since. Alumina is dissolved in a molten bath of cryolite at approximately 960°C; a direct electrical current causes aluminum metal to deposit at the carbon cathode and be tapped off as liquid metal. Carbon anodes are consumed in the process, producing CO₂ — making anode replacement a continuous operational requirement and a primary source of direct emissions. The process requires approximately 13–15 MWh of electricity per tonne of aluminum produced, making power cost and source the single most important variable in primary aluminum economics. All efforts to decarbonise primary production — including ELYSIS and HalZero — are fundamentally attempts to replace or reform this process.

The LME (London Metal Exchange) aluminum price is the global benchmark spot and futures price for primary aluminum, quoted in US dollars per tonne. The actual transacted price is the LME price plus a regional physical delivery premium, which reflects local supply-demand conditions, logistics costs, and tariff structures. The two most important premiums for companies on this page are the US Midwest Premium — significantly elevated by Section 232 tariffs, currently adding several hundred dollars per tonne above LME for US domestic transactions — and the European Duty-Paid Premium. For investors, understanding both the LME price and the applicable regional premium is essential to modelling the realised revenue of any primary aluminum producer or US-focused fabricator.

Bauxite is the ore from which all commercial aluminum is derived — a reddish, clay-like mineral found primarily in tropical and subtropical regions. It is converted into alumina (aluminum oxide, Al₂O₃) through the Bayer Process: crushed bauxite is digested in hot caustic soda, filtered to remove impurities (red mud), and precipitated to recover aluminum hydroxide, which is then calcined into white alumina powder. The ratio is approximately 2–3 tonnes of bauxite per tonne of alumina, and approximately 2 tonnes of alumina per tonne of primary aluminum — meaning roughly 4–6 tonnes of bauxite per tonne of finished metal. Alumina is itself a traded commodity, and companies with integrated bauxite-alumina operations — Rio Tinto, Alcoa, Norsk Hydro, Chalco — capture more value chain margin than pure smelters buying alumina on the spot market.

The two primary forms of aluminum semi-fabricated product, produced by fundamentally different processes and serving different end markets. Rolled products are made by passing aluminum through a series of rolling mills to produce flat sheet, plate, or foil — the primary output of companies like Novelis, Constellium, and Kaiser Aluminum's rolling operations. Rolled sheet goes into beverage cans, automotive body panels, aerospace plate, and battery foil. Extrusions are made by forcing heated aluminum through a shaped die to produce long profiles of consistent cross-section — structural beams, window frames, automotive crash rails, heat sinks, and industrial shapes. Extrusion producers include Norsk Hydro Extrusions, Bonnell Aluminum (Tredegar), and Kaiser Aluminum's extrusion plants. The two segments have different demand drivers, margin structures, and competitive dynamics: rolled products are more capital intensive with longer qualification cycles, while extrusions are more fragmented and closely tied to construction and automotive volumes.

Aluminum is one of the most versatile and widely used metals in the energy transition, valued for its combination of light weight, corrosion resistance, strength, and recyclability. In electric vehicles, aluminum replaces steel across body structures, battery enclosures, crash management systems, and wheels, reducing vehicle weight and extending range — a typical EV contains 30–50% more aluminum by weight than an equivalent internal combustion vehicle. In renewable energy, aluminum is the dominant material in solar panel frames, wind turbine components, and transmission infrastructure. In grid storage and power distribution, aluminum conductors handle the majority of high-voltage transmission globally. Unlike some battery materials tied to a single chemistry, aluminum's role in the energy transition is broad and diversified across multiple sectors, making demand growth relatively robust to shifts in battery chemistry or technology preferences.

Aluminum production follows a three-stage value chain. First, bauxite ore is mined — primarily in Australia, Guinea, Brazil, and Indonesia — and refined into alumina through the Bayer Process, requiring approximately 2–3 tonnes of bauxite per tonne of alumina. Second, alumina is smelted into primary aluminum through the Hall-Héroult electrolysis process, requiring roughly 13–15 MWh of electricity per tonne of metal produced. Third, primary aluminum is fabricated into semi-finished products — rolled sheet and plate, extrusions, castings, and forgings — for sale to manufacturers. A parallel and growing stream is recycled aluminum: remelting scrap requires only about 5% of the energy of primary smelting, making recycled content a major cost and sustainability lever. The companies on this page represent every stage, from integrated miners like Rio Tinto, Alcoa, and Chalco through to pure downstream fabricators like Constellium and Kaiser Aluminum.

The global aluminum price is set on the LME and is the primary revenue driver for primary smelters — companies like Century Aluminum, Chalco, and Yunnan Aluminium have direct and highly leveraged exposure to LME movements. However, regional physical premiums — most importantly the US Midwest Premium and the European Duty-Paid Premium — are added on top of the LME price and reflect local supply-demand balances, logistics costs, and tariff structures. US Section 232 tariffs, currently at 50% on most aluminum imports, have significantly elevated the Midwest Premium, directly benefiting US domestic smelters. For downstream fabricators like Constellium and Kaiser Aluminum, the LME price is largely a pass-through cost managed via metal price lag mechanisms — their earnings are driven by fabrication premiums and end-market volumes. Integrated producers like Norsk Hydro and Rio Tinto sit across multiple stages, providing partial natural hedging between upstream and downstream businesses.

Aluminum is one of the most carbon-intensive metals to produce at the primary smelting stage — the Hall-Héroult process emits CO₂ both from the electricity consumed and from the carbon anodes consumed during electrolysis. The carbon intensity therefore depends overwhelmingly on power source: a coal-powered smelter (as is the case for most Chinese capacity) may emit 15–20 tonnes of CO₂ per tonne of aluminum, while a hydropower-powered smelter — as in Norway, Iceland, Canada, or Yunnan Province — can achieve below 4 tonnes of CO₂ per tonne. This creates a meaningful and growing "green premium": European industrial customers and EV manufacturers increasingly require certified low-carbon aluminum, and are willing to pay a premium for it. Norsk Hydro's Hydro CIRCAL and Hydro REDUXA products and Yunnan Aluminium's hydropower-sourced metal are the clearest commercial examples. Longer term, ELYSIS (inert anode) and Hydro's HalZero aim to eliminate smelting emissions entirely.