The European energy landscape has evolved to include the concept of energy communities in most countries. In order to fully benefit the entire value chain, from consumers to producers, particularly including renewables, integration with electricity markets should be considered and further explored. This paper presents the results of methods and simulations conducted within the scope of the TRADERES project, which aims to develop "New Markets Design & Models for 100% Renewable Power Systems". The focus is on the operational context of energy communities in Portugal, including integration with MIBEL (Iberian Electricity Market). The implemented methodology involves energy management of an energy community, considering available renewable-based generation, storage, and flexibility. The numerical case study consider actual bidding scenarios in MIBEL, with real bids and prices.