An assessment of modular integrated gasification combined cycle (IGCC) power plants, based on Texaco entrained flow gasification, having a nominal capacity of 100 megawatts was conducted by Foster Wheeler. The scope of this study consisted of developing preliminary designs and relative economics for five modular IGCC power plant configurations in an effort to compare the use of air or oxygen as the oxidant for coal gasification and high temperature or low temperature processes for gas cleanup. Conceptual designs were prepared based on non-confidential information, estimated capital and operating costs, and determined the cost of electricity for five different modular IGCC plant configurations. In all five plant configurations, the same gas turbine, which is commercially available for conventional fuels, was used. It was assumed that this commercially available gas turbine could be modified without additional cost impact to accept the hot low BTU fuel gas produced from air gasification with high temperature cleanup. 16 refs.