The combination of high solar shares with high conversion efficiencies is one of the major advantages of solar gas turbine systems compared to other solar-fossil hybrid power plants. Pressurized air receivers are used in solar tower plants to heat the compressed air in the gas turbine to temperatures up to 1000°C. Therefore solar shares in the design case of 40% up to 90% can be realized and annual solar shares up to 30% can be achieved in base load. Using modern gas turbine systems in recuperation or combined cycle mode leads to conversion efficiencies of the solar heat from around 40% up to more than 50%. This is an important step towards cost reduction of solar thermal power. Together with the advantages of hybrid power plants-variable solar share, fully dispatchable power, 24 h operation without storage-solar gas turbine systems are expected to have a high potential for market introduction in the mid term view. In this paper the design and performance assessment of several prototype plants in the power levels of 1 MW, 5 MW and 15 MW are presented. Advanced software tools are used for design optimization and performance prediction of the solar tower gas turbine power plants. Detailed cost assumptions for the solarized gas turbine, the solar tower plant and further equipment as well as for operation and maintenance are presented. Intensive performance and economic analysis of the prototype plants for different locations and capacity factors are shown. The cost reduction potential through automation and remote operation is revealed.

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Achieving solar produced electricity at a reasonable price with large utility-size units is a worldwide goal. This can be achieved by high efficiency systems and hardware cost reduction. The ORMAT Brayton cycle solar hybrid gas turbine is a step in this direction. ORMAT took part in several solar projects in which it contributed to the “solarization” of the complete power block. This paper describes the main tasks involved in solarization, and includes experimental test results where helicopter turboshaft gas turbines were used. The paper reviews several solar projects and mainly the SOLGATE project during the years 2001–2003. During 2002–2003 the turbine was operated in Spain, combined with three volumetric receivers. The initial goal of achieving 800°C at the receiver outlet was achieved and is reported on below. The successful tests have encouraged the continuation of work using gas turbines of 10 MW and above, which has already commenced.