Saft’s Intensium ® Max 20P containerized Li-ion battery energy storage system turns braking trains into generators to save 10% on energy bills. SEPTA’s challenge The Southeastern Pennsylvania Transportation Authority (SEPTA) runs the public transport system for the US city of Philadelphia and the surrounding area, serving a population of 3.9 million. SEPTA was looking for a way to both make the most of its operating budget and boost its green credentials. SEPTA is located in the operating area of P JM, a regional transmission operator (RTO) that has opened its frequency regulation market to non-traditional resources. This prompted the decision to take an innovative approach that would use the world’s first system to capture the kinetic energy of braking trains and store it in a large-s

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