Atlantic ports are evolving into energy hubs in which wind, photovoltaic, marine and hydrogen technologies are integrated into electrical grids not originally designed for them, while enabling opportunities of new energy markets within port boundaries. The deployment of these technologies requires both suitable technological solutions and regulatory-legislative frameworks that enable their effective integration into ports’ power systems. This paper partly condenses results of the ENEPORTS project (Interreg Atlantic Area) into a practice-oriented methodology that port authorities and operators can follow when planning renewable hybrid systems. The methodology covers grid access, grid codes, feasibility studies, power quality assessment, protection systems’ coordination, market models, grid-integration challenges and operational considerations such as digitalisation, energy management systems (EMS), flexibility and internal energy markets. Data from current and projected demands of three port areas were used to model and study the feasibility and operational conditions of these hybrid systems, complemented by an analysis of case studies from other European ports. The methodology has been validated with real port ecosystems in Ferrol–San Cibrao, Granadilla and Douro–Leixões. The results provide a reusable roadmap to accelerate renewable hybrid system deployment while safeguarding grid stability and power supply quality in port areas.