The TRI5 Integrated Regional Energy Systems call module focusses on developing integrated system solutions, that are able to host high shares of renewables in the regional energy supply, by utilising flexibility and sector coupling options. Such solutions shall also help to increase the integration of renewables in the regional value chains as well as the resiliency and security in renewable energy supply. Specific emphasis will be on consortia of public and private companies, that are linked geographically and / or in a concrete integrated regional energy system context and are interested to develop integrated system solutions according to their own needs as active players in the energy system.