AMAX Extractive R and D manufactured, on a pilot-plant scale, two 250-gallon lots of clean and ultra-clean coal-water slurry fuel for DOE programs to develop coal-fueled direct-fired gas turbines. Both lots were prepared from high-volatile bituminous coal ground to pass 44 micrometers. The first lot, containing 1.95% ash, represented fuel manufactured with available coal cleaning technology. Advanced chemical coal cleaning technology was employed to prepare the second lot of ultra-clean coal-water mixture containing 0.4% ash. A conceptual design study was made for a coal processing plant to produce 1.7 million tons per year of ultra-clean coal-water mixture fueling a 500-MW gas-turbine generating station. The capital cost was estimated to be $227 million and the production cost was projected to be $5.16 per million Btu. Additional work is needed to refine these costs and to develop relationships between cost and fuel quality. 25 references, 17 figures, 17 tables.