The Metropolitan Transport Corporation’s fleet has become substantially younger in three years, but the improvement has not yet eliminated an important weakness in Chennai’s bus system: 611 of its 4,153 buses were aged 10 years or more as of August 2026, exceeding the nine-year replacement criterion prescribed for most state transport corporations.
The figures, obtained under the Right to Information Act, show a sharp fall in the average age of the MTC fleet, from 9.61 years in 2023-24 to 4.98 years in August 2026. That change reflects a large increase in new bus inductions, particularly during 2025-26, when 1,347 buses were added. But the age profile also shows that fleet renewal is uneven across depots and that aggregate improvement does not mean the replacement backlog has disappeared.
For Chennai passengers, the distinction matters. A lower average fleet age can indicate better vehicle availability and improved operating conditions across the system, but the experience of a commuter depends on the buses assigned to particular routes and depots. The RTI data points to a fleet in transition, with newer vehicles entering the system while a significant group of older buses remains in service.
The MTC’s average fleet age was 9.04 years in 2022-23 and rose to 9.61 years in 2023-24. It then declined to 7.43 years in 2024-25, 5.07 years in 2025-26 and 4.98 years by August 2026. The change coincided with the fleet expanding from 3,407 buses in 2024-25 to 4,060 in 2025-26. Another 111 buses were inducted in the current financial year up to August.
The data contains a small difference in the reported fleet totals. The age-wise information places the fleet at 4,148 buses, while the MTC’s fleet-strength data records 4,153 buses across 35 depots. Of these, 3,933 were listed as scheduled services. The difference does not alter the broader pattern: the corporation has added vehicles at a pace that has substantially lowered the average age, but not uniformly across its operating network.
The number of older buses has nevertheless fallen. In May 2024, the MTC had 1,643 buses aged nine years or more. By August 2026, the number of buses aged 10 years or more had declined to 611. The two figures are not directly identical age bands, but together they show the scale of the change in the older end of the fleet while also highlighting the number of buses that remain beyond the prescribed service threshold.
The distribution across depots is particularly important. KK Nagar had the largest number of buses aged 10 years or more: 112 out of a depot fleet of 195. Its average fleet age was 7.1 years. Mandaveli had the highest average fleet age at 9.16 years, although it had 40 buses in the 10-years-and-above category. Adambakkam had an average fleet age of 7.74 years and 44 buses aged at least 10 years.
At the other end of the distribution, Kilambakkam had the youngest fleet, with an average age of 1.82 years. Ambattur followed at 2.96 years, while Kundrathur and Tambaram recorded average fleet ages of 3.08 years and 3.53 years respectively. These variations show why a corporation-wide average cannot by itself describe the quality or age of the service available to every passenger.
The institutional benchmark is also clear. In July 2021, the state government revised replacement norms for state transport corporations. Buses operated by corporations other than the State Express Transport Corporation are to be replaced after nine years of service or 12 lakh kilometres, whichever comes earlier. SETC buses have a shorter seven-year replacement criterion, or 12 lakh kilometres, whichever comes earlier.
On that basis, the 611 MTC buses aged 10 years or more have crossed the nine-year service criterion. The rule is a replacement norm rather than the same as an automatic withdrawal date, and the available material does not establish how many of these buses have also crossed the distance threshold. It does, however, establish that a sizeable portion of the fleet remains older than the service age used by the state for replacement planning.
A separate national threshold concerns scrappage. Ministry of Road Transport and Highways rules require public transport buses to be scrapped after 15 years in service. When the National Vehicle Scrappage Policy came into effect on 1 April 2023, the MTC had 529 buses that had crossed the 15-year mark. The current data supplied in the report does not state how many of those buses remain in operation or how the 15-year category has changed since then.
This distinction between replacement and scrappage is central to understanding the MTC’s position. A bus can be beyond the state’s preferred replacement age without having reached the national scrappage threshold. That creates a period in which the corporation may continue operating older vehicles while waiting for procurement, induction and depot preparation to catch up. The result is a fleet that can be younger on average even while older buses continue to serve passengers.
The MTC’s response is built around continued induction. A senior official told DT Next that older buses were being retired as new vehicles entered the fleet. The process is expected to gather pace through the induction of electric buses, adding a technology transition to the replacement programme.
Under Phase II of the World Bank-supported electric bus project, the MTC is acquiring 750 air-conditioned electric buses through a Gross Cost Contract. The report states that 130 have already been launched. KK Nagar depot is being converted into an electric bus depot and is expected to receive 130 buses, according to the MTC official. The corporation has also floated a tender for another 1,000 air-conditioned electric buses.
The numbers suggest that electrification is being used not only to change the propulsion system but also to reorganise the age structure of the fleet. However, the available information does not establish the schedule for retiring every older bus, the routes on which the new buses will operate, or whether the proposed electric bus additions will directly replace the 611 buses that have crossed the nine-year criterion. Those details will determine how quickly the improvement visible in the average age is translated into consistent service conditions across depots.
The depot-level figures also underline the administrative challenge. Fleet renewal is not simply a matter of purchasing buses. Vehicles must be allocated, depots must be equipped, charging or maintenance systems must be prepared for electric buses, and scheduled services must be maintained during the transition. The contrast between Kilambakkam’s 1.82-year average and Mandaveli’s 9.16-year average shows that induction is already producing very different operating profiles within the same corporation.
For Chennai’s public transport system, the immediate evidence is therefore mixed but significant. The MTC has reversed a period of fleet ageing and reduced its average fleet age by more than half from the 2023-24 level. It has also reduced the number of buses in the older age bands. At the same time, 611 buses remain at least 10 years old, and some depots have much older fleets than the corporation-wide average suggests.
The next test is whether the planned electric bus procurements and continuing inductions can close that gap without creating new differences between depots. The key milestones are the retirement of older vehicles, the conversion of KK Nagar depot, the delivery of the remaining buses under the 750-bus project and the outcome of the tender for 1,000 additional electric buses. Until those steps are completed, the MTC’s younger average fleet will remain an important improvement, but not a complete measure of fleet renewal.