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The Smart Energy Grid concept aims to exploit Information and Communication Technologies (ICT) towards making the energy sector more secure, reliable and efficient, while the electricity markets are rapidly becoming more liberalized with new business actors/models being introduced. In particular, passive energy consumers are being transformed into active energy prosumers (i.e. both producers and consumers), while energy aggregation/services companies are emerging as intermediaries in the so called "Internet of Energy" arena. Prosumers need to have their energy assets efficiently managed and participate in the market independently of their size and negotiating power, while aggregators aim at maximizing prosumers' benefits by representing them as a single big power entity in the wholesale energy market. This paper introduces the Virtual MicroGrid (VMG) concept, in which multiple energy prosumers are orchestrated into bigger associations towards optimizing the association's benefits. An innovative decision support system platform is presented showcasing that the management of aggregated energy resources can outperform state-of-the-art solutions that manage resources at the individual prosumer's level. The platform's implementation is based on virtualization techniques and a wide range of functionalities are described, tested and validated. Datasets from 37 real-life prosumers are used and results of various decision-making algorithms show that under different system operation contexts, dynamic formation of prosumers' groups (clusterings) can provide remarkable energy savings and monetary profits to the end users.

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