Abstract
<jats:p>Marine Spatial Planning (MSP) is a key instrument for advancing sustainable ocean governance in Europe, yet the spatial distribution of socioeconomic benefits and trade-offs remains poorly understood. This study addresses this gap by applying and extending the Spatial Economic Benefit Analysis (SEBA) framework to evaluate the socioeconomic footprint of offshore wind energy and capture fisheries in France, with a focus on the North Atlantic–Western Channel (NAMO) region. Methodologically, a mixed-methods approach is used, integrating publicly available data, industry disclosures, and spatial analysis to produce regional-scale economic maps of employment, firm participation, infrastructure, and financial performance. The study also presents an interactive, updatable visualization platform that enhances SEBA, by enabling continuous data integration and dynamic exploration, strengthening its relevance for public policy and stakeholder engagement. Results show that offshore wind energy generates spatially concentrated yet internationally distributed economic benefits, characterized by transnational value chains and uneven regional participation. In contrast, fisheries exhibit highly localized benefits but increasing structural vulnerability, reflected in fleet decline, employment contraction, and financial dependence. These findings reveal a persistent asymmetry in benefit distribution within MSP, with implications for spatial equity and sectoral inclusion. By advancing SEBA as a scalable and decision-support tool, this research aims to contribute to a more transparent, data-driven MSP and to support the transition toward a more inclusive and sustainable blue economy.</jats:p>