Due to an increase of renewables in the electricity mix in Europe in the last years, balancing services being provided by small aggregators is getting increasingly important. The aim of this thesis is to qualitatively analyze different market accesses in Europe for small flexibility based FCR providers. For the analysis, five different countries were chosen: Switzerland, Belgium, Germany, Portugal and Spain. For the market access analysis for FCR services of the different countries, the prequalification process of each of them was explained and later compared. Out of the five countries compared, the one that appears to have less entry barriers is Switzerland, followed by Belgium and then by Germany. In addition to the qualitative analysis, a case study was developed, presenting the pilot project between the German start-up KOENA tec and it partners. In this project, industrial coffee machines are aggregated to provide FCR services to the grid, thanks to KOENA tec’s smart plug that can control the power output of the coffee machine. In this sense a simulation of the prequalification test was performed to determine the number of coffee machines that should be used to pass this test and provide 50kW of services to the grid. This was done through data analysis of the power profile of a coffee machine. The results show that a minimum of 278 coffee machines need to be aggregated to be able to provide 50kW of balancing services to the grid by using the specified coffee machines. ; Objectius de Desenvolupament Sostenible::9 - Indústria, Innovació i Infraestructura ; Objectius de Desenvolupament Sostenible::12 - Producció i Consum Responsables ; Objectius de Desenvolupament Sostenible::7 - Energia Assequible i No Contaminant