Topic Notes: Types of Fuels

Every energy system we rely on — from transport to electricity generation — begins with a fuel. A fuel is simply a substance that stores chemical energy, which can be released and converted into useful forms such as heat, motion, or electricity. Different fuels vary in how much energy they provide, how cleanly they burn, how easy they are to store, and how sustainably they can be produced.

In this topic, we explore the major categories of fuels, how they work at a chemical level, and the advantages and limitations of each. Understanding these differences helps us evaluate which fuels are suitable for particular applications and how our energy choices impact society and the environment.