[en] Throughout Europe, network operators are initiating Data projects, aiming to improve their operational performance. For them, these projects represent both potential added value and new challenges.. The Data Working Group was initiated in 2017 by two members of Think Smartgrids, Cosmo Tech and DCbrain, with contributions from Accenture, Atos, SenX, Colombus Consulting, la CRE, L'ecole des Ponts Paristech, GE, Gimelec, Images et Reseaux, Nokia, RTE, Siemens, Strasbourg electricite Reseaux, Trialog and Yele. The objective is to try to provide answers to operational issues and questions of grid operators regarding these digital projects: - What should the data processing chain be and what are the technological issues associated with each of its stages? - What are the real capabilities of existing technologies? Machine Learning, Deep Learning, Artificial Intelligence, Blockchain...? - How can data aspects (production, security...) be better controlled? - How can the production value be enhanced? And how can the framework of the Proof of Concept (POC) be overcome? Nevertheless, all electricity grid operators, in France and Europe, have successfully launched tests and even industrial data processing projects. Some have even initiated technological partnerships with disruptive players. The objective of the Data Working Group is to become one of the forums for exchange and reflection on these topics. The approach used by the Data Working Group has already made it possible to compare the visions of various stakeholders in the sector: network operators, suppliers, associations, regulatory authorities/licensors, creating a link between Think Smartgrids and players in the European market. This first study aims to describe the state of use for operational data optimization purposes, how these use cases are managed, and the obstacles and solutions in the deployment of these use cases by assessing the perspectives of TSOs/RMGs, solution providers, and institutions. To this end, the Data Working Group conducted more than 20 interviews with various key stakeholders. Europe is a dynamic space where many players are involved in data projects. Some consortium projects are supported by the European Commission via the Horizon 2020 Research Framework Program (2014-2020), or within networks such as ENTSO-E (https://www.entsoe.eu/data/it-platforms/). Others are carried out by DSOs or TSOs concerning their own field of transformation. If, within the framework of this study, the actors consulted were rather geographically located in southern Europe, the panorama of Data projects carried by DSOs/TSOs in northern Europe makes it possible to complete the overall vision. It also includes some H2020 projects to which many European players contribute (DSO, TSO, vendors...)