The GPDER+ project aims to research and develop a SCADA/DMS system dedicated to Predictive Management of the Distribution Network (high and medium voltage) and a Demand Response Management System (DRMS) platform that allows the implementation of new business models for the Management of Distributed Energy Resources (DER) operated by different entities (e.g., aggregators, marketers, consumer cooperatives). The platforms to be developed will be prepared to deal with the specificities of Distribution Networks, namely a high integration of renewable sources and flexible resources. To this end, the technical functional and non-functional requirements necessary for the integration of flexibility into the electricity market and system operation will be taken into account, providing the Distribution Network Operator with greater capacity for monitoring and predictive control of the electricity network and the integration of new business models based on the sale of flexibility to the Distribution Network Operator. The innovative and differentiating character of the GPDER+ solution stems from the proposed development logic – Predictive Management of Distribution Networks, taking into account the modeling of uncertainty associated with renewable energy sources, ensuring interoperability between the Distribution Network Operator's systems and new business models dedicated to the management of distributed electrical resources. Replicability is also a critical objective in the design of solutions, demonstrating the fundamental importance of adopting IEC standards, developing computational applications for networks with reduced monitoring of measurements at transformer stations, and integrating different types of DER (namely distributed storage). The aim is to revisit EFACEC's SCADA/DMS solution, providing it with greater robustness and scalability to the system, new functionalities at the core module level, and applications for network operation. A DRMS platform will also be developed for two business models in active consumption management: a) a cooperative made up of normal and special low-voltage consumers, adding flexibility at the transformer station level; b) a marketer essentially aimed at industrial customers and buildings connected to high and medium voltage.