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Chennai is on the brink of a clean mobility revolution. The Tamil Nadu Chief Minister, MK Stalin inaugurated over 120 electric buses on June 30—marking the city’s first major deployment of zero-emission buses. This will be the first time that the city bus operator- Metropolitan Transport Corporation (MTC) will operate e-buses! These 120 e-buses, all being non-AC, have been rolled out as part of a larger plan to electrify the fleet, with total of 625 buses expected to be introduced later this year in Phase 1. In Phase 2, which is slated for next year, another 600 are expected, taking the total to 1250 e-buses.
For a metropolis that moves lakhs of people daily, this is not just a fleet upgrade, it is a powerful signal that Tamil Nadu is serious about decarbonising transport and building climate-resilient cities.
Transport: A Key Lever in Tamil Nadu’s Climate Action
One of the key reasons why this move to go electric is a milestone for the state, is that transport is one of the growing contributors to greenhouse gases in rapidly urbanising state of Tamil Nadu. As per data from the recent report Tamil Nadu’s Greenhouse Gas Inventory and Pathways for Net-Zero Transition, GHG emissions from the transport sector in Tamil Nadu almost tripled between 2005 and 2019, from 10 million tonnes of carbon dioxide equivalent (MtCO2Eq) to 27 MtCO2Eq. The report also found that the share of transport sector emissions in the overall emissions has grown from 12% to 19% in the same period.
The situation is likely to have not improved post 2019 as well, as data from the official Vahan dashboard shows that EV adoption is still in the nascent stages in Tamil Nadu.
This slow uptake makes electrifying state-operated public transport fleets an important and high-leverage opportunity. With direct control over these fleets, the government has led by example. This one move has also enabled the broader EV ecosystem, including charging infrastructure, maintenance networks, and local manufacturing, to scale up!
How things will pan out from July onwards
MTC currently operates 3420 buses in the Chennai Metropolitan Region. As per estimates from other Indian cities, each bus running on diesel, emits tail pipe carbon emissions to the tune of 755 gm CO2 per kilometre. While public buses still generate lower emissions per passenger-kilometre compared to private vehicles like cars and two-wheelers, the absolute emissions from diesel buses remain detrimental to the environment, especially considering the daily operations of thousands of kilometres.
As per MTC’s current plans, the incoming e-buses will be introduced in phases. Initially these e-buses will be new additions to the fleet and will not be replacing the diesel buses. This will help in expanding the service of MTC to more parts of the city.
By doing so, MTC will nudge more people to choose public transport over personnel vehicles. This shift will help bring down not just tail-pipe emissions from private vehicles but also ease the everyday issue of traffic congestion. After all, a single bus that carries about 50 passengers can replace nearly 30 cars on the road. What’s more, buses take up less than 2% of the total road length, but serve over 30–40% of all urban commuters. So, every new bus added to the fleet doesn’t just clean up the air—it also frees up road space, making the city move better and breathe easier.
Additionally, MTC is exploring retrofitting older diesel buses with Compressed Natural Gas (CNG) technology. This parallel move will further lower tailpipe emissions from the remaining conventional fleet, ensuring that even non-electric buses contribute to a cleaner urban environment.
In subsequent phases, these electric buses will begin replacing ageing diesel buses, leading to a gradual but sustained reduction in the carbon emission intensity of Chennai’s public transport system. This strategy balances both immediate service expansion and long-term decarbonisation.
Funding Support | Electric Buses |
KfW | 500 |
World Bank- GCC based buses for MTC | 625 |
World Bank- GCC based buses for MTC | 600 |
KfW Phase 3 | 750 |
KfW Phase 4 | 650 |
KfW Phase 5 | 100 |
From Policy to Practice: Tamil Nadu Walks the Talk
In 2023, Tamil Nadu launched its updated EV policy, setting a clear goal, to make at least 30% of all buses run by State Transport Undertakings (STUs) electric by 2030.
The policy has stated that ‘The STUs run a large share of public buses in Tamil Nadu. The government will switch to electric buses in a phased manner and aim to make 30% of the fleet electric by 2030’
The current rollout of e-buses is a direct reflection of this commitment. With a total fleet of 20,508 buses across eight STUs, including MTC, the State Express Transport Corporation (SETC), and Tamil Nadu State Transport Corporation (TNSTC) divisions in Coimbatore, Madurai, Tirunelveli and others, the state would need to procure over 6,100 electric buses in the next five years to meet this goal.
While this target is ambitious, the state is already making decisive moves. Tamil Nadu has begun procurement of total of 2500+ e-buses through World Bank-supported Gross Cost Contract (GCC) models and KfW funding. Officials have also indicated that based on lessons from this initial tranche, the state will continue expanding the fleet by 500 to 750 buses annually. This steady, phased approach allows the state to scale up capacity on e-bus operations, while building on operational experience.
Beyond its state goals, this effort also contributes meaningfully to India’s national EV30@30 ambition, which aims to electrify 40% of all buses by 2030.
But in 2024–25, only 3% of all new buses sold in the country were electric. That’s just 3,400 e-buses, compared to more than one lakh diesel buses. In this situation, every effort, including that of Tamil Nadu is a step in the right direction.
Along with buying new buses, the state is also investing in depots and charging stations. This ensures the system is ready to support the growing e-bus fleet.
Through it all, ITDP India has been providing technical support to the state, helping shape procurement plans and training programmes. With the right support and strong leadership, Tamil Nadu is building a path that other states can follow to make public transport clean, efficient, and future-ready.



Written by Donita Jose, Senior Associate, Communications, with inputs from Sooraj EM, Deputy Manager, Transport Systems and Electric Mobility
Edited by Aangi Shah, Senior Associate, Communications