Athens Metro: Energy recovery system tested on Line 1

Athens' urban rail operator has initiated trials of a novel energy recovery system on Line 1 of the metro, a pioneering effort within Greece's railway infrastructure aimed at enhancing energy efficiency and advancing sustainable public transport. This initiative marks the first deployment of such technology on a Greek rail network, according to officials involved in the project. The energy recovery system, introduced by STASY, the entity responsible for operating Athens' rail services, functions by capturing kinetic energy produced during train braking. This energy is then converted into electricity and redirected back into the power grid. The implementation began in mid-July at the traction substation located in Neo Faliro, with a second unit set to become active soon at the Iraklio substation. According to estimates from the authorities, this system is projected to recover approximately 4,500 megawatt-hours of electricity each year along Line 1, commonly referred to as the Green Line or the ISAP electric railway. This amount constitutes roughly 12.5% of the line’s total annual electricity usage and is anticipated to lead to substantial reductions in operational expenses. In addition to installing the energy recovery systems, the project encompasses the modernization of the traction substations at both Neo Faliro and Iraklio. These upgrades aim to enhance the reliability of the power supply and mitigate issues stemming from outdated infrastructure. Funded under Greece’s ESPA development program, the project carries a budget of €4.1 million and is being executed by Siemens Mobility. The completion date is slated before the end of December 2026, adhering to the established contractual timeline. The introduction of the energy recovery system aligns with broader goals to promote environmental sustainability within the transportation sector. By harnessing previously wasted energy, the system contributes to lowering carbon emissions associated with metro operations. This approach not only supports national objectives toward renewable energy integration but also sets a precedent for other transit systems considering similar technologies. The project's timeline indicates that the initial phase commenced in July, focusing on the Neo Faliro substation. With the upcoming activation of the Iraklio installation, the scope of the energy recovery initiative expands across key points of the metro network. Each phase involves meticulous calibration and monitoring to ensure optimal performance and seamless integration with existing electrical infrastructure. Key stakeholders involved include STASY, which oversees the day-to-day operations of the metro system, and Siemens Mobility, providing technical expertise and engineering solutions. Collaboration between these entities ensures that the technological advancements meet both current operational demands and future expansion possibilities. Background information reveals that Line 1, serving as one of the primary arteries of Athens' public transport, faces increasing pressure to adopt more efficient practices due to rising passenger numbers and environmental concerns. The energy recovery system addresses these challenges by offering a practical solution to reduce dependency on conventional power sources while maintaining service quality. As the trial progresses, continuous assessments will determine the effectiveness of the system in real-world conditions. Feedback gathered from this phase will inform potential expansions or modifications to the technology, ensuring its adaptability to different segments of the metro network. The successful implementation of this system could influence policy decisions regarding energy management in other sectors, demonstrating the viability of integrating advanced technologies into public infrastructure projects. As the project moves forward, attention will remain focused on achieving the stated objectives within the designated timeframe and budget constraints.