Metlen Energy & Metals PLC (Metlen) is a diversified company that carries out business activities, including mining and metallurgy; energy related; and engineering, procurement and construction (EPC), and gas trading. The company produces alumina, aluminum, and bauxite. Metlen also generates and distributes electricity and supplies natural gas. It also offers construction, operation, maintenance and management of natural gas facilities, pipelines, networks, and other related infrastructure.

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The R&D arm of Metlen focuses on advancing its research and development (R&D) through significant investments in the circular economy, digitization, and innovative waste utilization methods. The company strives to contribute to sustainable industrial practices by participating in over 25 European research programs, which support efficient green technologies and the development of new methods for utilizing bauxite residues. Additionally, it plans to enhance recycling efforts, particularly in liquid waste management within its production processes, and operates three Biological Sewage Treatment Plants for urban wastewater. The Innovation Department, especially its Research and Sustainable Development (RSD) section, plays a crucial role in these initiatives, participating in 24 EU and Greek co-funded research programs aimed at producing useful materials from bauxite residues and improving hazardous waste processing. Protergia, powered by Metlen, focuses on promoting sustainable energy consumption and enhancing energy efficiency through digital technology solutions. The company strives to reduce energy costs, greenhouse gas emissions, and energy billing by participating in European research programs like DIGITISE and ECLIPSE, which aim to empower consumers and improve energy applications. These initiatives reflect Metlen's commitment to smart energy solutions and continuous innovation in the energy sector. In FY2023, the company incurred expenses of EUR63.0 million, which as a percentage of revenue stood at 1.1%.