Electro-fuels are an emerging class of carbon-neutral bio-fuels considered to be one of the most effective alternative routes for a viable carbon-free road transport system. Electro-fuels are made by storing electrical energy from renewable sources in the chemical bonds of liquid or gas fuels. The most common electro-fuels include butanol, octanol, biodiesel, and hydrogen. Other examples are other alcohols and carbon-containing gasses such as methane and butane. This flourishing breed of alternative fuel can play a key role in decarbonising the environment in the long-run. It also has an extensive capacity to convert electrical energy into chemical energy that can be distributed by existing transportation fuel infrastructure. These eco-friendly alternative fuel types can also be stored and used for future use.