Conclusions drawn from the studies performed during this reporting period are as follows: The PFB/AFB combined cycle commercial plant investigated will have a capital cost of $567/kw and a cost of electricity of 28.47 mils/kw-hr based on mid-1977 costs. Based on a trade-off study performed during this reporting period, it is concluded that the use of field assembled PFB combustors will be more economical than using shop assembled and rail-shipped units. Due to the reduced size of shop assembled combustors, the number of units used must be increased by a factor of five. A technical and economic comparison of various systems proposed for removal of PFB particulates from the gas entering the gas turbine indicates that two Aerodyne two-stage cyclones in series may be more appropriate for this application than systems based on either Ducon's Granular Bed Filter or Donaldson's Tan-Jet cyclones. However, further development effort is required to confirm the performance of these units and to establish the maximum permissible loading entering a gas turbine. With reasonable care in operations and the use of commercially available control methods, fugitive dust emissions from coal and sorbent handling and storage systems and solid waste disposal systems can be minimized. Water borne pollutants from coal pile runoff and leachates from waste disposal areas require additional study and special handling to insure that ground water contamination does not occur.