E100 fuel gets govt nod, paving way for cars running on 100% ethanol

E100 is a fuel containing nearly 100 per cent ethanol. E20 contains 20 per cent ethanol and 80 per cent petrol. E85 is a much higher blend, with about 85 per cent ethanol. The main difference is the amount of ethanol in each fuel and the type of vehicle that can use it.

The new rules place E100 alongside E85 in fuel, emissions and testing provisions. Vehicles designed for these blends are called flex-fuel vehicles. They can operate on different proportions of ethanol and petrol, rather than relying on one fixed blend.

E20 petrol is already available, and India has achieved its 20 per cent blending target ahead of the original 2030 timeline. However, ordinary petrol cars, including E20 vehicles, cannot use E85 or E100 unless specifically designed and certified for them.

The Ministry of Road Transport and Highways amended the Central Motor Vehicles Rules, 1989, to formally include E100 alongside E85. This creates an official regulatory path for vehicles using very high ethanol blends. It matters because manufacturers can now develop and certify such vehicles under clearly defined rules.

The amendments expand references to E85 so they also cover E100. They update fuel specifications, emission-related tables and vehicle-testing requirements. An explanatory note states that E85 and E100 are only for flex-fuel vehicles designed by original equipment manufacturers and certified for those fuels.

The rules also raise the gross vehicle weight limit from 3,000 kilograms to 3,500 kilograms. The final notification followed a public consultation, after draft rules were published in April for 30 days to invite objections and suggestions.

No exact number of E100-capable vehicles currently on the road is provided. The article identifies the Wagon R Flex Fuel, launched by Maruti Suzuki India in June 2026, as India’s first flex-fuel passenger vehicle. It can run on blends from E20 to E100, but that does not establish a national vehicle count.

E100 is not a universal replacement for petrol in existing cars. Fuels containing more than 20 per cent ethanol and up to 100 per cent ethanol are intended only for vehicles designed and certified to use them. Certification and vehicle compatibility are therefore essential.

Conventional petrol cars, including cars designed for E20, are not allowed to use E85 or E100 under the revised framework. The approval creates a route for compatible vehicles, while keeping high-ethanol fuels restricted to suitable models.

Flex-fuel vehicles are vehicles designed to operate on different proportions of ethanol and petrol. This gives them a wider fuel range than conventional petrol cars. In the article’s framework, the range can include higher blends such as E85 and E100.

The key mechanism is compatibility by design and certification. Original equipment manufacturers develop vehicles for specified ethanol blends, then certify them for use. A vehicle approved for a range from E20 to E100 can use fuels across that range, while a conventional petrol car cannot automatically do so.

Maruti Suzuki India’s Wagon R Flex Fuel illustrates the concept. Launched in June 2026, it is described as India’s first flex-fuel passenger vehicle and can run on blends from E20 to E100. Toyota, Tata Motors and Hyundai are also developing such vehicles for India.

Maruti Suzuki India launched the Wagon R Flex Fuel in June 2026. The vehicle is described as India’s first flex-fuel passenger vehicle and can run on blends ranging from E20 to E100. Toyota Motor Corporation, Tata Motors and Hyundai Motor Company are also developing flex-fuel vehicles for the Indian market.

The new approval gives manufacturers a formal regulatory framework for vehicles using higher ethanol blends. E100 is now included in rules covering fuel specifications, vehicle emissions and testing procedures. Manufacturers can therefore develop vehicles against recognised requirements rather than operating outside the existing framework.

The approval does not make every car compatible with E100. Vehicles must be specifically designed and certified by their original equipment manufacturers. As the government promotes alternative fuels, the framework supports manufacturers preparing to introduce higher-blend and flex-fuel models.

If E100 vehicles become widely used, India could replace more petroleum fuel with ethanol. The government says reducing dependence on imported crude oil is a key objective of its ethanol-blending programme. Imported crude oil is identified as a major contributor to the country’s current-account deficit.

The policy also aims to cut emissions. E100 vehicles would use fuel containing nearly 100 per cent ethanol, but only in vehicles designed and certified for it. The regulatory change supports this possibility by allowing manufacturers to develop higher-blend vehicles and by adding E100 to emissions and testing rules.

The scale of the effect remains uncertain because the article does not provide forecasts for E100 adoption or import reductions. It reports nearly 2,000 crore litres of ethanol production capacity and annual tenders exceeding 11 billion litres for E20, showing the wider programme’s existing scale.

The source does not describe how ethanol is produced or blended. In established fuel practice, ethanol is commonly made by fermenting sugars or starches from plant material, then separating and purifying the alcohol. It is blended with petrol in measured proportions, such as 20 per cent ethanol in E20 or nearly 100 per cent in E100.

The blend name indicates the ethanol share. E20 contains 20 per cent ethanol and 80 per cent petrol. E85 contains about 85 per cent ethanol, while E100 contains nearly 100 per cent ethanol. High blends require vehicles specifically designed and certified for them.

Using more ethanol can reduce the amount of petroleum fuel needed for transport. That can lower dependence on imported crude oil, a key government objective. India has nearly 2,000 crore litres of ethanol production capacity and has achieved its E20 target ahead of schedule.