In April 2018, a new research project started at the THEMIS tower: the POLYPHEM project ("Small-Scale Solar Thermal Combined Cycle"). POLYPHEM is a Horizon 2020 project funded under the Energy programme (LCE-07-2016-2017 - Developing the next generation technologies of renewable electricity and heating/cooling). The consortium is coordinated by the CNRS-PROMES lab and implemented by a total of 9 partners from 4 EU member countries. The project will end in March 2022 and has a budget of 4,975 M€ (EC grant) over these 4 years. POLYPHEM aims at improving the flexibility and the performance of small-scale Concentrated Solar Power plants, thanks to a solar-driven micro gas-turbine technology. As a final result, the project will build a 60 kW prototype plant with a 1,3 MWh thermal storage unit and will validate this innovative power cycle in a relevant environment (TRL 5), at the Themis solar tower in Targassone.