Heavy distillate fuels are well suited to gas turbine operation for industrial and marine service. The heavy distillate fuels significantly broaden the economic application potential of gas turbines. The fuel, the required fuel handling techniques, and the engine modifications required for dependable operation and long life are discussed.Industrial gas turbine fuel specifications are designed to indicate suitable fuels for specific climates and anticipated duty cycles. Specific fuel properties causing reduced gas turbine life, increased smoke levels, or decreased reliability must be controlled. Many of the flight fuel requirements are not needed for the industrial gas turbines; however, there are other properties which must be specified.