The shift to coastal renewables presents two linked challenges: sustaining project profitability and using limited grid export capacity efficiently. This thesis develops and applies a data-driven techno-economic framework for co-located floating photovoltaic (FPV) and offshore wind (OWT) hybrids. Using ERA5 irradiance, hub-height wind, and wave fields together with GEBCO bathymetry, the workflow models FPV and OWT hourly outputs, aggregates them to a hybrid series, and applies an export-capacity limit to quantify curtailment and grid utilization. A transparent site-selection scorecard—covering resource quality, solar–wind complementarity, depth/bathymetry, distance to port/grid, and constraints or policy risk—ensures two study nodes (in China and in Europe) are buildable and comparable.