Tamil Nadu Budget: Major Initiative To Convert Diesel Buses To CNG
The Tamil Nadu government has unveiled its 2025-26 budget, highlighting significant developments in the automobile sector. A key initiative involves transitioning all state-operated buses from diesel to compressed natural gas (CNG). This move aims to address environmental concerns and improve efficiency. The Tamil Nadu budget allocates INR 70 crore for this conversion, marking a substantial investment in sustainable public transport.
Currently, state transport corporations manage Tamil Nadu's government buses, which predominantly run on diesel. With rising pollution levels, alternatives like CNG are being considered. CNG engines utilise natural gas, offering a cleaner option compared to traditional fuels. This shift aligns with broader trends across India, where CNG usage is increasing due to its environmental benefits and cost-effectiveness.

Switching to CNG offers several advantages. It significantly reduces pollution and enhances mileage. Converting a standard vehicle to CNG can lead to notable savings. The Tamil Nadu government has previously experimented with CNG kits in a pilot project, demonstrating the feasibility of this transition. The current budget allocation will facilitate the installation of these kits in existing diesel buses.
The cost of converting a diesel bus to CNG ranges from INR 5.5 lakh to INR 6 lakh. Based on this estimate, over 1000 buses could undergo conversion with the allocated funds. However, specific details about which buses will receive the kits remain undisclosed. Further announcements are anticipated as the project progresses.

Converting to CNG is expected to boost bus mileage. Diesel buses currently achieve between 5.2 and 5.96 km per litre. With CNG kits, mileage could increase to between 6 and 6.98 km per litre. Additionally, CNG is more affordable than diesel, priced at INR 75 to INR 79 per kg.
Buses typically travel between 2000km and 7000km monthly, incurring substantial diesel costs. The government's initiative aims to curb these expenses while addressing public safety concerns regarding CNG kits. Ensuring safety remains a priority as the transition unfolds.
Projected Savings & Future Plans
The government anticipates saving INR 4 per km by converting diesel buses to CNG, making the project economically viable. This initiative reflects a commitment to sustainable transportation solutions and fiscal responsibility. While details about specific bus conversions are pending, the overall strategy promises long-term benefits for both the environment and public finances.
DriveSpark Thinks
Tamil Nadu's plan to convert state-run buses from diesel to CNG represents a forward-thinking approach to public transportation challenges. By investing in cleaner fuel alternatives, the government aims to reduce pollution and operational costs while enhancing service efficiency for commuters across the state.


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