A novel fuel composition suitable for fueling fluid bed reactors has been discovered. The fuel composition comprises a mixture of a combustible base, a densifying component, and a binder. The fuel composition can be formed into a briquette that is stable in a fluid bed reactor. The amount of densifying component can be adjusted to produce briquettes that exhibit neutral density in the fluid bed. At neutral density the briquettes will mix throughout the fluid bed. If desired, higher levels of densifying component can be utilized to make briquettes that sink in the fluid bed such that they remain in the combustion zone of the fluid bed. The fuel compositions of the present invention allow the use of inexpensive fuels as the combustible base, such as waste petroleum coke and coal.