Solid fuels are those fuels which are in the form of solid mass when they are stored or transported. All the solid fuels are either composed of carbon and hydrogen or their derivatives.

Some of the solid fuels include:

- Coal: Coal is a fossil fuel formed from the remains of plants that lived millions of years ago. It is used to generate electricity, power industrial processes, and heat homes and businesses.

- Wood: Wood is a solid fuel that is derived from trees. It can be burned in a fireplace, stove, or boiler to produce heat.

- Charcoal: Charcoal is a solid fuel that is made by burning wood in a limited oxygen environment. It is often used in grilling and camping.

- Peat: Peat is a solid fuel that is formed from partially decayed plant matter. It is used to generate electricity and heat homes in some countries.

- Coke: Coke is a solid fuel that is produced from the destructive distillation of coal. It is used in the production of steel and other metals.