The significant increase of fluctuating renewables leads to great challenges for the power grids and for the power suppliers: the flexibility of their power plants has to rise to be sufficiently competitive. For thermal power plants the integration of thermal energy storages (TES) seems to be a promising approach. Therefore the so called sandTES technology, an active particle based TES system, is introduced. In a second step it is used to demonstrate the flexibility enhancement via TES integration. Thereby a novel concept for integrating this type of TES is presented and afterwards discussed. The results give an overview about the chances and restrictions of this implementation concept.

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