FLEXITRANSTORE project shall develop a next generation of Flexible Energy Grid (FEG), which provides the technical basis to support the valorisation of flexibility services, enhancing the existing European Internal Energy Market (IEM). This FEG addresses the capability of a power system to maintain continuous service in the face of rapid and large swings in supply or demand, whatever the cause. Thus, a wholesale market infrastructure and new business models within this integrated FEG should be upgraded to network players, incentivize new ones to join, while demonstrating new business perspectives for cross border resources management and energy trading. The strategic objectives of FLEXITRANSTORE are: to enhance and accelerate the integration of renewables into European energy systems and to increase cross border electricity flows across Europe. Flexibility is one of the keys to meeting these strategic objectives. A range of state-of-the-art ICT technologies / control improvements will be exploited to enhance the flexibility of this novel energy grid while increasing the utility of the existing infrastructure by integrating storage and demand response management. From a market perspective, state-of-the-art ICT technologies / control improvements will be applied to develop an enhanced market model on an integrated platform, for flexibility services and to support cross border auctioning and trading of energy. The FEG components and the digital market infrastructure will be deployed in 8 Demonstrations which will take place in 6 countries (Greece, Bulgaria, Cyprus, Slovenia, Belgium, Spain), focusing on illustrating specific functions and serving real needs and existing challenges.