Development and Implementation of a Flexibility Platform for Active System Management at Both Transmission and Distribution Level in Greece  
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3 Energoinfo Group, N. Ninkovica 3, 11090 Belgade, Serbia; [EMAIL_ADDRESS] (4 Independent Power Transmission Operator (IPTO), Dryrachioun 89 & Kifsson, 10443 Athens, Greece; [EMAIL_ADDRESS] (D.M. ); 20 [EMAIL_ADDRESS] (G.F.)  
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1 Core Department, National and Kapodistrian University of Athens (NKUA), Euripus Complex, 34400 Pashna Euboca, Greece; [EMAIL_ADDRESS] (M.Z. ); [PERSON]DRESS] (F.Z. ); [EMAIL_ADDRESS] (T.LM.) 2  
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* The establishment of common market architecture for Europe that requires standardizing products and basic requirements for grid services [4; 5; 6; 7]. * The establishment of common IT architecture and IT interfaces that offer open architecture of interactions between various platforms and allow competition in any market across Europe [8]. * The proposal and implementation of scalable solutions verified by large-scale demonstrators [9] that test distinctive use cases. Greece is one of the demonstrator countries in the southern region cluster. In Greece, since 1 November 2020, the target model for the balancing market has been adopted [10]. Currently, the balancing market in Greece consists of the balancing capacity market, the balancing energy market, and the imbalance settlements according to the target model structure [11; 12]. The day-ahead required pool system, which started in 2005, was superseded by the new market design. This central dispatching model substituted unit-based involvement for portfolio-based participation in the scheduling process and dispatching bids [13; 14]. The system's safety depends on the balancing market because it has both economic [15; 16; 17] and physical impacts [18; 19; 20]. The unit-based/central dispatching structure is the basis of the balancing market in Greece. According to an optimization algorithm, the system operator in Greece determines the lowest-priced bids and sends related orders to each production unit chosen to provide each service [21; 22]. Especially in the early stages, the capability of providing balancing services according to the operator's expectations is ensured. The necessary orders are then given as needed to the entities that offer balancing services. The current balancing uses three separate markets: the market for balancing capacity, the market for balancing energy, and the market for settling imbalances [12; 23]. The three primary balancing capacity products that the market design has specified are the manual upward and downward manual Frequency Restoration Reserve (mFRR), upward and downward automatic Frequency Restoration Reserve (aFRR), and upward and downward frequency containment reserve (FCR) [12; 13; 22; 23]. All entities that can deliver balancing services are obliged to submit market bids, whose amount has been determined by the system operator (SO). When manual Frequency Restoration Reserve (mFRR) activation is necessary for upward or downward movement, the operator can make this determination in almost real-time and subsequently sends the corresponding orders that derive from the cost bids with the lowest price [23]. Entities that can deliver aFRR in real-time receive automatic orders to preserve the system's balance and ensure its secure operation [24]. In order to help facilitate the energy transition, the EU finances projects that aim to provide a solution to the flexibility challenge.