Aluminium—long known as the “metal of the future”—is undergoing a transformation as industries worldwide race to cut emissions. Today, it is being redefined as green aluminium, a low-carbon alternative produced through renewable energy, efficient technologies, and circular economy systems. As one of the most widely used materials in packaging, buildings, mobility, and renewable energy infrastructure, aluminium is central to global sustainability pathways. But the challenge is enormous: primary aluminium production accounts for nearly 3% of global CO₂ emissions, making the decarbonisation of this sector essential.
The bulk of aluminium’s emissions come from energy. The Hall-Heroult smelting process alone consumes about 85% of the industry’s electricity, historically around 17 MWh per tonne but now closer to 13 MWh in modern plants. What matters most, however, is the power source. Coal-based smelting can emit 15–20 tonnes of CO₂ per tonne of aluminium, while renewable-powered smelting can reduce this to as little as 0–2 tonnes. With India’s aluminium industry still heavily dependent on coal, shifting the electricity mix toward clean power is the single biggest lever for decarbonisation.
India’s Path to Green Aluminium
India, the world’s second-largest aluminium producer, places the sector at the heart of its 2070 Net Zero commitment. Domestic producers are pursuing multiple strategies: improving smelter efficiency, increasing renewable power procurement, strengthening scrap collection, and adopting global standards for traceability and environmental reporting. These steps are equally important for maintaining access to export markets shaped by carbon-based trade rules such as the EU’s Carbon Border Adjustment Mechanism (CBAM).
Technological innovation is expected to accelerate progress. Inert anode technology, which emits oxygen instead of CO₂, could dramatically cut process emissions. Advances in anode and cathode materials can lengthen equipment life and reduce carbon use, while energy recovery systems can capture waste heat and boost efficiency across the value chain.
Recycling: Aluminium’s Biggest Climate Advantage
Recycling offers the most immediate sustainability gains. Secondary aluminium production uses 95% less energy and emits more than 90% less CO₂ than primary smelting. India’s recycling sector, however, remains fragmented and largely informal. Strengthening urban mining networks, formalising scrap logistics, investing in state-of-the-art remelting facilities, and standardising alloy labelling can unlock a robust circular economy. Mandating minimum recycled content in cans, automobiles, and construction materials would drive large-scale demand.
Policy, Markets, and the Push for Low-Carbon Tonnes
The global marketplace is increasingly demanding verified low-carbon materials. Yet “low-carbon aluminium” labels vary widely in scope—whether they include mining, which grid factors they use, and how emissions are reported. While the Aluminium Stewardship Initiative (ASI) certifies responsible practices, it does not set a universal CO₂ benchmark. India will need clear, comparable, third-party-verified carbon accounting rules to maintain competitiveness in carbon-regulated markets.
Domestically, the transition can be accelerated by enabling smelters to access 24/7 clean electricity—hydropower where available, supplemented by wind, solar, and green open-access power purchase agreements. Government procurement could mandate “low-carbon aluminium first,” while supporting pilot projects on inert anodes, electric calcination, and carbon capture for alumina refining. Aligning NITI Aayog’s net-zero investment framework with these technologies would unlock long-term capital for clean energy and recycling infrastructure.
A Strategic Opportunity for India
Aluminium demand in India could rise by 40% by mid-century as electric mobility, renewables, and urban development expand. With abundant sunlight, rapidly growing renewable capacity, a strong manufacturing base, and a large untapped scrap stream, India is well positioned to become Asia’s hub for green aluminium.
A sector once seen as hard to decarbonise can become a model of climate-smart growth—powered by clean electricity, circularity, and credible carbon accounting. The world will continue to be built with aluminium; the real question is whether it will be built with green aluminium, and whether countries like India will seize the opportunity fast enough.
