Modern power grids are moving away from centralised, infrastructure-heavy transmission system operators (TSOs) towards distribution system operators (DSOs) that are flexible and more capable of managing diverse renewable energy sources. DSOs require new ways of managing the increased number of producers, end users and more volatile power distribution systems of the future. The EU-funded PlatOne project is using blockchain technology to build a platform to meet the needs of modern DSO power systems, including data management. The platform is built with existing regulations in mind, and will allow small power producers to be easily certified so that they can sell excess energy back to the grid. The platform will also incorporate an open-market system to link with traditional TSOs.