Solar-Powered Metro: Bengaluru's Namma Metro Blue Line Aims for Net-Zero Energy

Summary Box: A study by the Indian Institute of Science (IISc) has found that Bengaluru's upcoming Namma Metro Blue Line can potentially operate entirely on solar energy on a net annual basis. The study, conducted in collaboration with the Bangalore Metro Rail Corporation Limited (BMRCL) and supported by HSBC, suggests that the 55-km Blue Line corridor can achieve full annual energy self-sufficiency through large-scale solar photovoltaic (PV) integration.

What is the Potential of Solar Power in Metro Rail Systems?

The study, titled 'Assessing the Potential of Directly Using Solar Power to Run the Operations of Blue Line of Namma Metro', was conducted by the IISc Sustainable Transportation Lab in collaboration with BMRCL and supported by HSBC under its Corporate Social Responsibility (CSR) programme. The researchers modelled the Blue Line's traction power requirements, solar resource mapping across BMRCL properties, and analysis of train operations under different scenarios. According to the findings, an installed solar capacity of 83.3 MWp would be sufficient to meet the corridor's annual energy demand of 152 GWh under full-scale operations involving 21 trains running at two-minute intervals.

Key Provisions / Legal Framework

The report has already been submitted to BMRCL for consideration. The study was led by Prof. Ashish Verma of IISc's Department of Civil Engineering, along with a team of researchers from multiple departments. Conducted between August 2025 and March 2026, the research included modelling of the Blue Line's traction power requirements, solar resource mapping across BMRCL properties, and analysis of train operations under different scenarios.

• ▸The study represents the first corridor-scale techno-economic analysis in India examining direct integration of solar power into a metro rail traction system.
• ▸The report noted that BMRCL could immediately install up to 30 MWp of rooftop solar capacity without making any modifications to the existing traction infrastructure.
• ▸This alone could offset around 36% of the Blue Line's total traction energy demand.

The Numbers That Matter

According to the findings, an installed solar capacity of 83.3 MWp would be sufficient to meet the corridor's annual energy demand of 152 GWh under full-scale operations involving 21 trains running at two-minute intervals. Researchers estimated that BMRCL-owned properties, including station rooftops, elevated viaduct parapets, station canopies, and depot rooftops, can accommodate between 79 MWp and 89 MWp of solar installations.

• ▸The study underlined the role of regenerative braking, which can recover around 29% of traction energy.
• ▸When combined with rooftop solar generation, nearly 61% of the Blue Line's total traction energy demand could be offset.
• ▸Apart from financial savings, the report emphasised significant environmental benefits. Phase 1 alone could prevent the emission of more than 44,500 tonnes of carbon dioxide annually, equivalent to removing nearly 19,000 petrol cars from Bengaluru's roads.

Significance and What Changes Now

The study demonstrates that metro rail systems can evolve into net-zero energy transport systems using their own physical infrastructure. Prof. Ashish Verma said the study demonstrates that metro rail systems can evolve into net-zero energy transport systems using their own physical infrastructure. He described the Blue Line project as “ready-to-tender infrastructure investment” with long-term economic and environmental returns, and urged BMRCL and the Karnataka government to move towards pilot implementation without delay.

CATEGORY: national TAGS: solar-energy, metro-rail, sustainable-transportation, bengaluru, india SOURCE: The Hindu