Delta Electronics India, a power management and smart green solutions provider, has successfully implemented a 6.4 MWh/4 MW battery energy storage system (BESS) for Metro Railway Kolkata at the Central station of the Blue Line. With this milestone, Kolkata Metro becomes India’s first underground metro railway to adopt a large-scale battery energy storage system to enhance operational resilience and energy efficiency.
The project was executed at a cost of INR 20 crore by Delta Electronics India and is expected to recover the investment cost in its lifetime of 13-15 years by energy saving due to power factor improvement and peak demand reduction. It will also supply backup power for tunnel ventilation and environment control systems. Furthermore, it enables Kolkata Metro to draw immediate traction power support during grid failures or power interruptions, allowing passenger-carrying trains to be safely hauled to the nearest station.
Niranjan Nayak, managing director, Delta Electronics India, said, “We are proud to support Kolkata Metro while demonstrating how our energy storage solutions play a vital role in strengthening India’s urban transport infrastructure, especially by strengthening reliability in underground metro operations where uninterrupted power supply is essential.”
The now-operational system has been designed and delivered to enhance network preparedness against grid disturbances and power-related contingencies.
“The fully integrated BESS combines high-efficiency power electronics with lithium iron phosphate battery technology to deliver rapid response during grid disturbances. In addition to emergency traction support, the system enables peak power management and power factor improvement, driving sustained operational efficiency,” said Rajesh Kaushal, vice president, Energy Infrastructure Business Group, Delta Electronics India. “All the critical components in this solution (power conversion system, energy management system and battery racks) are designed, developed and manufactured inhouse within Delta, giving us an edge over the design, quality, reliability and long-term sustainability of the solution for such critical applications.”
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