1. Introduction.- Solar Thermal Power Plants — Where are we coming from, where are we bound to?.- 2. Results of CRS-Plants.- The Central Receiver System (CRS) of the SSPS — Project: Subsystem and System Performances.- Results of CESA — 1 Plant.- Concept and Operating Experiences with EURELIOS — The 1 MW Helioelectric Power Plant of the European Communities.- Results and Evaluation of the 1 MW Solar Thermal Electric Power Plant at Nio.- Themis Evaluation Report.- Three Years of Test and Operation at Solar One.- 3. New Projects.- Commercialization of Solar Central Receiver Technology.- Solar Central Receiver Technology Advancement for Electric Utility Applications.- Themis 20 – 60 MW Projects.- GAST — Status of Work: Tests in Almeria, System Analysis- and Future Prospects.- Central Receiver Facility at The Weizmann Institute of Science.- Electric Power Generation Study for the Dominian Republic.- Preparations for an International 30 MW(el) CRS — Power Plant Study.- 4. Technologies.- 4.1 Concentrating Systems.- Heliostat Selection Code to Obtain Certain Peak Power Level (An Artificial Intelligence Approach).- Analysis of GAST Heliostat Image Measurements in Almeria.- 4.2 Receivers.- IEA/SSPS Sodium Cavity and External Receiver Performance Comparison.- Non-Steady Thermodynamic Behavior of Sodium Cooled Receivers — Results of Calculations and Measurements.- Evaluation of Advanced Sodium Receiver Losses.- Themis Receiver: Thermal Losses and Performance.- The Solar Thermal Test Facility.- 4.3 Systems — Measurements and Evaluation Techniques.- Analysis of the Main Foreseeable Operation Transients of a Gas-Cooled Solar Power Plant in a Previous Design Stage of the Project.- Examination of the Heliostat Field and Advanced Sodium Receiver (ASR) of the IEA-SSPSCentral Receiver System.- Examination of the Heliostat Field and Molten Salt Primary Loop.- The Up-Keeping of Themis Primary and Secondary Loop: Power Consumption and Procedures Optimization.- 5. Workshop on “Plants”.- Results of the Session 5.1.- Systems, Performances, Thermal Inertia Capacities and Technologies.- Compared Performance of Central Receiver Plants.- High Flux Experiment at SSPS.- NIO Receiver System.- Themis Annual Energy Estimate.- Calculations of Design Points on CRS-Plants — Application to SSPS-CRS Heliostat Field.- Results of the Session 5.2.- Methods of Measurement — Evaluation Techniques.- Evaluation and Qualification of the HFD Bar During the ASR High Flux Experiment.- Solar Flux Measurement — Methods Tested in Themis.- Measuring System VISIR for Data Acquisition of Emitted and Reflected Radiation in the Visible (VIS) and Infrared (IR) Range.- Development and Test of Measuring Absorber Device with Gas Gap Cooling for Measurement of the Effective Radiation Absorptance of Hot Surfaces.- Themis Collector System Performance Simulation.- Results of the Session 5.3.- Problems of Mass Production.- Performance of NIO Heliostat.- Status and Results of Heliostat Development at MBB.- Field Control System Description and Evaluation Results of the ASINEL — GAST Testseries Heliostats.- Results of the Sessions 5.4 (Market Possibilities and Future Prospects) and 7.5 (Systems and Economics) are presented on page 981.- Comparison of Solar Thermal and Photovoltaic Electricity Generation.- Site Evaluation for STCRPP in the Swiss Alps.- Technical and Economic Possibilities for Solar Power Plants in Austria.- Solar Tower Plants — An Option for the Mediterranean Region.- Results of the Panel Discussion on “Solar Thermal Plants”.- Index of Authors.