The plant and receiver performances of the 10 MWe Solar Thermal Central Receiver Pilot Plant located in Barstow, California, are evaluated based on measured and calculated data. An extended data base is used to update the receiver performance reported in March 1983. Full and part load results and trends in receiver performance when operating at varying outlet temperatures and pressures are provided. The plant and receiver performances are compared to design predictions. Data are included for both points in time and average values of performance.