Abstract: As we know a world is now going towards a green energy, every sector is trying to adopt a green energy as soon as possible. A transportation sector has a big opportunity to implement a green energy so many of countries tries to make a vehicle which operate by green energy like Electric, NG (Natural Gas) etc. But every technology has limited operating capacity and also issues which have a complex solution. In electric vehicle has some issues which have a limited solution also an availability of electric sources like charging station available everywhere and also charging time is more than gasoline vehicle consequences vehicle manufacturing companies make a CNG two vehicle which is easy to available and on spot utilise, In this paper we compare both system as per different researcher and tries to understand which system is better for future green technology.

Keywords: Introduction, Basic Principle, Availability of Fuel, Hybrid Vehicle

| DOI: 10.17148/IARJSET.2025.12309