Imagine a future where the air is clean, the skies are clear, and our energy sources are as renewable as the sun and wind themselves. At the heart of this green transformation lies an unsung hero—aluminium. However, it might not always have captured the spotlight like more glamorous materials, this unassuming metal is quietly driving a revolution in renewable energy. Alternative and clean energy sources drive ongoing research and development in the aluminium industry, sparking process innovations.
From solar panels to wind turbines, aluminium has become an essential material in today's renewable energy landscape. Solar and wind energy have emerged as promising alternatives for powering aluminium smelting operations. However, their intermittent nature presents a challenge that can be addressed through advanced storage solutions, ensuring a steady and reliable energy supply. By adopting renewable energy sources, the aluminium industry reduces its carbon footprint and sets a precedent for sustainable practices. This move aligns with the global effort to combat climate change and supports a cleaner, greener future.
With the influx of low-carbon aluminium usage for a Net-Zero economy, international conglomerates are planning the construction of massive renewable energy projects. These projects predominantly focus on wind, hydro, and solar power sources. Recently, we've witnessed a significant increase in new renewable energy initiatives driven by the growing demand for low-carbon solutions. Energy companies are developing innovative methods to enhance regional power grids, ensuring a steady and reliable energy supply to support ongoing industrial activities.
However, it should also be noted that the aluminium industry is highly energy-intensive, and the conventional process of primary aluminium production releases 95 per cent more CO2 than the production of recycled aluminium. In response, many leading aluminium producers are exploring ways to make their operations greener and more sustainable. Research indicates that recycling post-consumer aluminium can save 90 million tonnes of CO2 and conserve 100,000 GWh of energy—equivalent to the Netherlands' annual electricity consumption.
Solar energy revolution powered by aluminium
Aluminium is driving innovation in the solar power sector. Solar panels made from aluminium are lightweight and offer excellent conductivity, reflectivity, strength, and durability. At the forefront of this shift is aluminium extrusion, a process in which aluminium alloys are shaped into custom profiles under high pressure. This technique imparts valuable characteristics such as corrosion resistance, lightweight durability, and superior conductivity, making aluminium ideal for diverse renewable energy applications. Aluminium alloys 6063, 6061, and 6005 are suitable for solar applications.
Solar power is currently the third-largest source of renewable electricity globally, following hydropower and wind, according to the International Energy Agency (2024). This achievement is primarily driven by solar panel manufacturers. According to Germany's Fraunhofer Institute for Solar Energy Systems, China produces 86 per cent of the world's solar panels annually, while Europe and North America each contribute approximately 2 per cent. Consequently, it's not surprising that six of the world's seven largest solar panel manufacturers are based in China.
As per AL Circle's report, China plays a significant role as a major global supplier of solar panels, with export data revealing a 34 per cent increase in solar panel exports during the first half of 2023. In this period, 114GW of solar panels were shipped worldwide, with half of the shipments directed to Europe, marking a substantial rise from the 85GW recorded in the corresponding period of the previous year. Some of the top solar power projects include -
- Dutch offshore solar company Solar Duck has developed floating photovoltaics using aluminium, taking advantage of its corrosion-resistant properties. The lightweight metal enables the structure to remain three meters above water without rusting or corroding due to moisture.
- Adani Group, one of the world's largest solar power producers, announced the construction of 10 GW of solar manufacturing capacity by 2027, with the new manufacturing capacity to be set up at Adani's Mundra Special Economic Zone in Gujarat.
- The Bui reservoir in Ghana now hosts Africa's largest floating solar photovoltaic (PV) project. This impressive milestone highlights Ghana's dedication to sustainable solutions and sets a benchmark for the region amid growing environmental challenges.
- The 531 megawatt (MW) Mendubim solar project, developed by Hydro Rein, Equinor, and Scatec, had officially began operations in Brazil, supplying electricity to the Alunorte Alumina refinery. Initiated in July 2022, this partnership quickly brought the project to fruition in less than two years.
Role of aluminium in the wind energy sector
Aluminium extruded products play a crucial role in wind energy, significantly enhancing turbine efficiency and performance. The use of lightweight aluminium alloys in wind turbine blades is becoming more widespread due to their excellent strength-to-weight ratio, enabling the design of larger, more efficient blades that capture greater wind energy. In addition, aluminium-extruded components are extensively used in turbine tower platforms, particularly offshore wind farms.
The material's corrosion resistance and durability make it ideal for harsh marine environments, ensuring the longevity and reliability of wind energy infrastructure. With India ranking as the world's fourth-largest country in installed onshore wind energy capacity, reaching 42.8 GW as of April 2023, using aluminium-extruded products is set to drive further advancements and innovation in the wind power sector. Some of the relevant projects developed under the wind energy sector are:
- Baotou Aluminum (Group) Co., Ltd., a leading large-scale aluminium smelting enterprise in China with ten facilities, has successfully installed the first wind turbine at its self-owned power plant. This installation transitions from a 1200 MW new energy project in Damaoqi to a renewable energy source. This action is in line with Baotou Aluminum's dual carbon goals, aimed at accelerating the company's transformation to a clean energy power supply for smelting.
- Hydro Rein is reportedly partnering with Pajala Almänning to develop a large-scale wind power project in response to the increasing demand for renewable power in northern Sweden. Hydro Rein and Pajala Almänning have signed a land lease agreement to develop wind power over 7,000 hectares in price area SE1.
Aluminium's part in hydropower infrastructure
Aluminium extrusion plays a vital role in advancing hydropower infrastructure by offering lightweight yet durable solutions for various components in hydroelectric projects. Turbine blades, for instance, benefit from aluminium extruded profiles, which provide the strength needed to endure the powerful forces of flowing water while maintaining a lightweight structure. Moreover, extruded aluminium profiles are integral to the construction of key structural frameworks within hydropower plants, including sluice gates, penstocks, and intake structures.
These profiles offer exceptional strength and corrosion resistance while remaining relatively lightweight. In summary, aluminium extrusion delivers the strength, corrosion resistance, and versatility essential for constructing and maintaining sustainable energy infrastructure within the hydropower sector. Different types of aluminium are used in wind turbines, including aluminium, bronze and aluminium honeycomb.
Building the green infrastructure with aluminium
With the growing emphasis on environmentally conscious and sustainable solutions across industries, architects increasingly seek green building techniques. Aluminium alloys are particularly valuable in this regard due to their unique properties. One of the most significant advantages of aluminium is its complete recyclability. Aluminum is 100 per cent recyclable and retains all its original qualities through recycling. Moreover, producing recycled aluminium uses up to 90 per cent less energy compared to extracting and processing aluminium ore.
Aluminum also excels in insulation. It can protect against cold temperatures up to four times more effectively than 10 cm thick brick or 20 cm thick stone barriers. Additionally, aluminium's ability to provide insulation while allowing sunlight and air into buildings makes it ideal for energy-efficient designs. For instance, the expansive glass facades on skyscrapers, supported by aluminium structures, are not only visually striking but also contribute to better energy efficiency. The lightweight nature and formability of aluminium enhance the overall construction process. It is easier to ship and work with and results in less waste, making the construction process more efficient. By opting for modern aluminium alloys, builders can achieve lower greenhouse gas emissions, reduced energy and water usage, and minimized waste sent to landfills.
The use of aluminium in the renewable energy sector is expected to grow in the coming years as the world transitions to cleaner energy sources. The International Aluminium Institute estimates that the demand for aluminium in the renewable energy sector will grow by 6 per cent annually between now and 2050. As the world increasingly turns to renewable energy sources like solar, wind, and hydropower, aluminium's unique properties—lightweight nature, durability, and complete recyclability—make it vital in advancing these technologies. The material's role in improving the efficiency of solar panels, enhancing wind turbine performance, and supporting robust hydropower infrastructure underscores its significance in the transition to a low-carbon future. The increase in global aluminium extrusion usage in 2023 is estimated to have been driven by the improved automotive industry and the growing renewable energy sector.
Moreover, aluminium's environmental benefits extend beyond its role in energy production. Its recyclability and energy-efficient manufacturing processes contribute significantly to reducing overall carbon emissions, aligning with global sustainability goals. As the demand for low-carbon solutions grows and international efforts to combat climate change intensify aluminium will continue to be a key player in building a cleaner, greener future. Through innovation and sustainable practices, the aluminium industry is meeting the present energy needs and paving the way for a more sustainable and resilient future.
