Kolkata Metro Rail Corporation has deployed a 4 MW/6.4 MWh battery energy storage system (BESS) to enhance operational resilience by providing immediate traction power support during grid failures, enabling trains to safely reach the nearest station.

The BESS also supports peak power management, power factor improvement, and overall energy efficiency. The solution integrates an in-house-designed and manufactured power-conversion system, an energy management system, and lithium-iron-phosphate battery racks.

The system was deployed on Kolkata Metro’s Blue Line by Bengaluru-based Delta Electronics India, a provider of power management and smart green solutions.

Niranjan Nayak, Managing Director at Delta Electronics India, said the project aligns with India’s National Program on Advanced Chemistry Cell Battery Storage, launched in 2021, which aims to strengthen energy storage infrastructure in public transport systems nationwide.

“Integrated at the central substation of the Blue Line, the newly operational system has been designed and delivered to enhance network preparedness against grid disturbances and power-related contingencies,” he said.

Delta also provides EV charging solutions for residential, commercial, workplace, public, and fleet charging sites.

Last June, the company signed a power purchase agreement to scale its renewable energy usage and decarbonize its operations.

Public transport systems in India are increasingly adopting clean energy solutions to power their operations. Several metros, railways, and rapid transit systems across the country have opted for rooftop solar to meet their power needs.

In November 2025, the National Capital Region Transport Corporation implemented an innovative ‘Solar on Track’ project at the Namo Bharat Depot in Duhai, Ghaziabad, where solar panels have been installed on the tracks. This was the first-of-its-kind initiative for any regional rapid transit or metro system in India.

In July last year, the Delhi Metro Rail Corporation invited bids to set up rooftop solar power projects with a capacity of 5 MW over its Phase-IV metro rail network.

Uttar Pradesh Metro Rail Corporation also invited bids to implement a 5 MW rooftop solar project for stations, depots, and other metro sites.