"INTERPLAY" analyses, classifies and assesses legality of the (future) use of digital platforms in the electricity market, developing a holistic view of regulation (electricity grids), the electricity market (competition law) and data protection law on the matter. In doing so, INTERPLAY highlights opportunities and risks, but also legal limits and possible needs for specific regulation. Furthermore, a comparison with the development in the EU will help to (indirectly) verify the results and will perhaps lead to new insights. Thereby, INTERPLAY aims at clarifying the legal framework for digital platform providers, energy utilities and consumers (or prosumers) and identifying the possible need for political action.