Only a few modifications will be required to start a vehicle using CNG laced with 10 per cent hydrogen. However, experts say significant changes in the engine will be mandatory for vehicles using fuel with a blending over 10 per cent. Some leading automobile and three-wheeler manufacturers are expected to come out with modified engines that could run on a maximum of 30 per cent blend of hydrogen.

IOC is already testing hydrogen blended CNG at its Faridabad Research and Development Centre. The new green fuel was being tested on three-wheelers, light commercial vehicles, and minibuses.