To reach the project objectives a screening of the potential of various technologies that may be important for future energy generation and/or storage was made.. To assess the systems in the wide context, some Key Performance Indicators (KPIs) were defined, including thermodynamic, environmental, technical and resources indicators. Several technologies were initially analyzed with the use of these KPIs and simplified calculations to get the overview of the potential and to enable choosing technologies for further studies. For detailed analysis a few were chosen, including systems that are based on renewable energy to produce electricity, heat, or gaseous fuels. Detailed mathematical models of these systems were built in order to calculate most important evaluation indices and to optimize their operation. These models served also as input to economic analysis, evaluating the profitability of the solutions on the current market and showing the size of incentives that has to be introduced, if they are not yet profitable. Also, the environmental assessment of the chosen technologies was made with the use of Life Cycle Assessment (LCA), which is a tool that enables evaluation of the technologies from an environmental point of view (including their influence e.g. on human health, greenhouse effect, etc.) in a very wide context (e.g. from cradle to grave). Finally, a projection of the potential presence and its consequences of the proposed technologies in the future energy mix was made. The analysis was conducted for the case of Spain. The results of the project were presented in scientific conferences and papers for scientific journals were prepared. Moreover, posters were presented during European Researchers Night organized at IMDEA Energy Institute.