Praça, IsabelMorais, H.Ramos, CarlosVale, ZitaKhodr, H. M.2013-04-162013-04-162008978-1-4244-1905-0978-1-4244-1906-71932-5517http://hdl.handle.net/10400.22/1364Distributed energy resources will provide a significant amount of the electricity generation and will be a normal profitable business. In the new decentralized grid, customers will be among the many decentralized players and may even help to co-produce the required energy services such as demand-side management and load shedding. So, they will gain the opportunity to be more active market players. The aggregation of DG plants gives place to a new concept: the Virtual Power Producer (VPP). VPPs can reinforce the importance of these generation technologies making them valuable in electricity markets. In this paper we propose the improvement of MASCEM, a multi-agent simulation tool to study negotiations in electricity spot markets based on different market mechanisms and behavior strategies, in order to take account of decentralized players such as VPP.engSustainable developmentDecision-makingDistributed generationElectricity marketsIntelligent agents coalitionsVirtual power porducersconference object2013-04-1210.1109/PES.2008.4596710