Delta Electronics India has announced the successful deployment of a 6.4 MWh/4 MW Battery Energy Storage System (BESS) at the Central Sub-station of Metro Railway Kolkata’s Blue Line corridor, marking a key technological advancement in India’s mass rapid transit infrastructure. With the commissioning completed recently, the Kolkata Metro has become the first underground metro network in the country to integrate a large-scale battery storage solution, aimed at improving energy efficiency and operational resilience.
The newly commissioned BESS has been designed to strengthen network security by providing backup power support in the event of grid disturbances or sudden outages. The system ensures that passenger-loaded trains can be safely hauled to the nearest station during power interruptions, while also maintaining critical systems like tunnel ventilation and environmental control. This ability is expected to significantly enhance commuter safety and reduce operational risk.
Speaking on the occasion, Niranjan Nayak, Managing Director of Delta Electronics India, said the deployment reflects the company’s vision of enabling reliable, energy-efficient power solutions for vital public infrastructure. He underscored the importance of uninterrupted power supply in underground metro operations, where any disruption can have serious safety and operational implications.
The system uses advanced lithium iron phosphate battery technology paired with high-efficiency power electronics. According to Rajesh Kaushal, Vice-President, Energy Infrastructure Business Group at Delta Electronics India, the fully integrated solution combines in-house designed and manufactured power conversion systems, energy management systems, and battery racks — ensuring high quality, performance, and long-term sustainability.
In addition to emergency backup power, the BESS also provides peak demand management and power factor improvements, contributing to overall energy efficiency and reduced operational costs over its life cycle. The project is aligned with the National Programme on Advanced Chemistry Cell (ACC) Battery Storage, which aims to scale energy storage infrastructure across India in support of sustainable urban mobility.
By commissioning this system, Kolkata Metro sets a new standard for the adoption of battery storage technology in rail transit networks nationwide, while reinforcing Delta Electronics India’s leadership in delivering safety-critical, energy-resilient solutions to urban transport systems.
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