This thesis develops a citizen-facing platform prototype for Renewable Energy Communities (RECs). Existing REC geoportals, dashboards and simulation tools can already support renewable-energy potential assessment, spatial analysis, techno-economic simulation and scenario comparison. However, their outputs are often expressed through technical indicators such as self-consumption, self-sufficiency, renewable-energy coverage, energy surplus, installed capacity and carbon-emission reduction. These indicators are useful for planners and technical stakeholders, but they are not always directly understandable for ordinary citizens. The thesis addresses this gap by establishing a translation workflow from REC technical indicators to citizen-facing platform outputs. It uses the 58 indicators proposed by Mutani, Santantonio and Goulias (2020) as the source indicator framework.