In the context of REED project, in line with the European data strategy, we define a Data Management Plan (DMP) to manage the data collected, processed and generated by the project. Contributing to appropriate data management throughout the project is the aim of REED's DMP. It explains what data will be produced by the project, how datasets will be handled and stored, if and how they can be utilised or made available for reuse and verification, and how they will be curated and maintained. The DMP has been defined early, by month 4, and documented in this Deliverable D2.1. The objective of the DMP is to guarantee the data sharing functionalities for all stakeholders while managing the data under the FAIR principles: the digital assets must be Findable, Accessible, Interoperable and Reusable. One of the main work packages in REED is WP5, which ensures data is not only collected, exploited and shared correctly between stakeholders in a secure and reliable way, but also made accessible as a service to generate strategic value through the REED platform. Assuring that data on the REED platform is transferred in a regulated way to maintain data owner autonomy and agency over data, this DMP will be continuously updated to be in line with the work in WP5 on how to use the standardised framework provided by the IDSA and GAIA-X for secure and sovereign data sharing. The REED’s DMP is a public, live document that is evolving throughout the REED project duration. During the project the DMP will be continuously updated in case any change occurs in the consortium policies, and by the end of the project duration the final version of the DMP will be released.