PortGRID is a feasibility study, funded by the German Federal Ministry for Digital and Transport (BMDV), that explores how inland port energy infrastructures can support shipping electrification while integrating renewable energy efficiently. The study examines smart grids, energy storage and intelligent load management. With regard to methodology and data, the mixed-method approach includes site visits, stakeholder interviews and operational data analysis. Technical modeling and simulations assess renewable integration and grid stability. Regulatory and economic feasibility is evaluated. PortGRID will inform research on smart grids and guide policies for sustainable, resilient and competitive inland ports.