This report addresses a specific application for the Gulf States Utilities Company at the Roy S. Nelson site located at Westlake, Louisiana. This application consists of supplying synthetic gas produced from a coal gasification plant for use as fuel for a combustion turbine designated as Nelson Unit No. 7. This unit is intended to be integrated with an existing steam turbine, Nelson Unit No. 4, in a combined cycle mode. The proposed project is based on pressurized, fluidizing bed, coal gasification technology - a domestic technology developed under DOE sponsorship by Westinghouse. The process has been designed for application to power generation equipment. The technology has been successfully demonstrated at the Westinghouse pilot plant at Waltz Mill, Pennsylvania. The gasification unit has demonstrated the ability to process all types of coal without production of tars and oils, and produces gas with a heating value of approximately 300 Btu/scf. The proposed project builds upon the engineering and technical data available from the existing Nelson Unit No. 4, as well as Nelson Unit No. 7, a nominal 100-MW combustion turbine, capable of combusting coal-derived gas, that was recently placed in operation. The tangible results of this study are presented in this report: physical description in words, diagrams, and drawings of a proposed addition that would convert the GSU Nelson Station into an IGCC power plant; analysis of the financial consequences of making such a conversion; assessment of the availability to be expected from this new type of coal-burning power plant, and suggestions for maximizing that availability; documentation of the baseline environmental situation at the plant and listing of the additional permits deemed to be required in order to implement the recommended program. 48 figures, 51 tables.