Material Insights · Understanding the Material World

Aluminium and Energy-intensive industry

Primary aluminium is one of the most electricity-intensive industrial products, at about 15 MWh per tonne with power typically about 40% of cost, so electricity prices decide where smelters run and when they shut.

Aluminium (commodity) and Energy-intensive industry (energy): 5 relationships.

How they are linked

1. Power intensity of smelting

Physical flow · Strong · Electricity → aluminium smelting

Aluminium is made by passing a large direct current through alumina dissolved in molten salt, so electricity is a raw material of the process, not just a utility.

  • about 15 MWh electricity needed per tonne of primary aluminium
  • about 40% typical share of electricity in smelter production costs
  • about 40 times energy needed to make aluminium compared with copper

This intensity is why smelters cluster beside cheap hydro, coal or gas power and sign long contracts or build captive plants. It also makes aluminium the metal most exposed to energy prices among the base metals.

Sources: ING Think

2. Power price shocks curtail smelting

Cost and price · Asymmetric · Dear power cuts aluminium output

Smelters on market-linked power contracts lose money quickly when electricity prices spike, so they curtail pot lines, which removes metal from the market.

  • about 1.4 Mt European smelting capacity suspended by the end of 2022
  • about 2% that capacity as a share of the global total
  • 60 kt a year curtailed French capacity restarting in 2023

The 2022 energy crisis showed the link runs mainly one way: high power prices shut capacity fast, while restarts are slow, as with Aluminium Dunkerque's restart of 60 kt a year of curtailed capacity, expected to reach full output only by end-May 2023. Smelters with captive or long-term fixed-price power are much less exposed. These figures date from early 2023.

Sources: ING Think

3. Part of the sector

Physical flow · Direct · Aluminium smelting sits inside energy-intensive industry

Aluminium smelting is one of the core energy-intensive industries alongside steel, cement, ammonia and chlor-alkali, so this link reflects aluminium being one of the sector's products rather than a separate input.

Read this link as membership: demand, power costs and climate rules for energy-intensive industry apply directly to aluminium smelters, the most energy-intensive base metal producers. The physical use of aluminium by the other members of the sector is small by comparison.

Sources: ING Think

4. Price link: electricity cost

Cost and price · Weak · Both ways

Electricity is the largest cost in smelting, but most smelters buy power on long fixed contracts or generate it themselves, so a US industrial power price index barely moves with world aluminium.

  • -0.11 monthly change correlation
  • 0.19 12-month change correlation
  • 0.30 fitted elasticity

The near-zero monthly link, with a best fit at a five-month lag, shows that power cost works through capacity decisions over years rather than through monthly price moves. Regional shocks such as Europe's in 2022 act through curtailments, which this US index does not capture.

Sources: ING Think; Material Insights (World Bank, FRED, IMF data)

5. Indian emission intensity targets

Policy · High in India · Carbon rules for heavy industry cover aluminium

India's carbon credit trading scheme sets emission intensity targets sector by sector for energy-intensive industry, and aluminium smelters were among the first covered.

  • about 5.8% emission intensity cut required for aluminium against a 2023-24 baseline
  • 2025-26 to 2026-27 first compliance period
  • 282 industrial units covered across aluminium, cement, pulp and paper and chlor-alkali

Smelters run by Vedanta, Hindalco, Nalco and Balco are covered; plants that beat their target earn tradable credits, while those that miss must buy credits to cover the shortfall or face environmental compensation set by the Central Pollution Control Board. About 96% of Indian smelters rely on captive coal power, so meeting the target depends largely on changing the power source.

Sources: ETV Bharat; Grantham Research Institute, LSE; Drishti IAS

For investors

Key learnings

  1. At about 15 MWh per tonne and around 40% of cost, power is the deciding factor in smelter competitiveness.
  2. High power prices cut supply quickly, as Europe's 1.4 Mt of suspended capacity by the end of 2022 showed, while restarts are slow, so power shocks tend to support aluminium prices.
  3. India's carbon credit scheme now prices emission intensity for smelters from 2025-26, adding a cost for coal-powered capacity and a credit for cleaner plants.

What to track

  • Industrial power prices in Europe and smelter curtailments: Signals supply cuts or restarts outside Asia (Monthly · power exchanges, company statements)
  • Smelter cost curve and power cost per tonne: Shows which plants are at risk at a given aluminium price (Quarterly · industry analysts, company results)
  • Indian carbon credit prices and smelter compliance: Adds or removes cost for Indian producers (Annual · Bureau of Energy Efficiency)

For policymakers

Key learnings

  1. Aluminium smelting is among the most electricity-intensive large industries, so power tariffs and supply reliability decide whether a country keeps its smelters.
  2. Europe had suspended about 1.4 Mt of capacity by the end of 2022 when power prices spiked, a warning for any policy that leaves heavy industry exposed to spot power.
  3. India's targets of about 5.8% lower emission intensity for aluminium by 2026-27 start a path that will require cleaner power for smelters.

What to track

  • Emission intensity of Indian smelters against targets: Shows whether the carbon credit scheme is changing practice (Annual · Bureau of Energy Efficiency, MoEFCC)
  • Industrial power tariffs and captive generation rules: Sets smelter competitiveness (As revised · CERC, state commissions)
  • Primary aluminium output: Shows response to power and carbon costs (Monthly · Ministry of Mines)

India

India's smelters, run by Vedanta, Hindalco, Nalco and Balco, are among the first plants covered by emission intensity targets under the carbon credit trading scheme, with about a 5.8% cut required for aluminium from a 2023-24 baseline.

Sources

  1. Aluminium smelter shutdowns threaten Europe's green transition, ING Think (2023)
  2. Price correlation, Material Insights, Material Insights (World Bank, FRED, IMF data)
  3. India notifies first emission intensity targets for carbon-intensive sectors, ETV Bharat (2025)
  4. Decarbonising the aluminium sector in India, Grantham Research Institute, LSE (2026)
  5. Greenhouse Gas Emission Intensity (GEI) Target Rules, 2025, Drishti IAS (2025)