Industrial wastes were identified as potential high temperature (up to 800 degrees C) TES materials for application in the Hybrid solar tower power plant with decoupled combined cycles (HSTPPDCC) scheme. These wastes can be categorized as follows: (1) Slags from the metallurgical industry, and (2) Coal power plant industry solid wastes. So primarily, the selection methodology of these identified wastes is presented. Then, updated data about the Moroccan generation of these wastes is exhibited and targeted local industries are identified. In the second part of this work, four Moroccan representative solid wastes were considered to validate the selection methodology, and they are namely: Induction furnace slags (IFS) gathered from a local metallurgical industry which were experimentally investigated in a previous work; and other three solid wastes gathered from the local coal power plant industry (i.e. Coal fly ashes (CFA), Coal bottom ashes (CBA), and Coal bottom clinker (CBC)). Finally, a laboratory experimental investigation was conducted only on these three later wastes in order to assess their TES potential up to 800 degrees C, as IFS was already investigated in a previous work and its obtained results were reported in this paper for comparison. Thus, their thermo-physical and chemical properties were evaluated, as well as their thermal stability up to 800 degrees C. The obtained results are promising as all the investigated materials demonstrated good thermal energy storage properties for application in solar tower power plant (up to 800 degrees C at least).