Offshore wind energy is quickly expanding globally, driven by growing demand forrenewable energy and technological advances that enable larger, more efficient projects. Todate, its development has occurred predominantly in temperate regions, which already haveaccumulated experience and well-established guidelines for assessing the environmental andsocial impacts of these projects. However, the growing interest in expanding the sector intropical and subtropical regions requires adapting good practices to diverse and differentecological, social, and regulatory contexts. The objective of this Guide is to propose good practices for Environmental ImpactAssessment (EIA) processes in the offshore wind energy sector in tropical environments.The document offers guidance to improve the quality of environmental and social impactstudies and to strengthen decision-making on licensing, financing, and investment inthese projects. Harnessing energy resources in tropical environments poses specific socio-environmentalchallenges, due, among other factors, to the high biological diversity, the strong presenceof artisanal fishing, and still-evolving regulatory frameworks. The focus of this Guideon tropical environments does not imply a rigid geographical delimitation, but reflects theintention to recommend practices appropriate to the particularities of these environments.Another difference from existing technical guides is the integration, at each stage ofthe EIA, of Ecosystem-Based Management (EBM) principles, an approach aligned withthe objectives of international agendas focused on the ocean and biodiversity. The Guide is primarily aimed at staff from agencies responsible for conductingthe EIA process and consultants involved in preparing environmental and social assessments.However, it can also be useful for professionals from companies in sectors suchas energy and infrastructure, civil society organizations, legislators, oversight bodies,and researchers interested in the subject. The content can be used as a technical referencefor defining legal frameworks and regulations in countries where the offshore windsector is in its early stages. The preparation of the Guide involved extensive literature and documentary review oflegal frameworks and international guides, analysis of cases, and participatory developmentof the content through workshops and consultations with specialists, officials from EIAagencies, consultants, community representatives, and researchers from different Brazilianinstitutions. Although professionals who work primarily in Brazil were consulted, the Guideis international in scope, containing recommendations applicable to other tropical marineand coastal environments worldwide. The Guide provides practical recommendations supported by a solid conceptual foundationand grounded in scientific knowledge. The first three chapters present internationalguidelines for ocean protection (Chapter 1), guidelines to strengthen the relationship betweenproject-level EIA and its planning context (Chapter 2), and the role of public participationthroughout the EIA process (Chapter 3). The Guide addresses essential aspectsof current construction technologies for this type of project (Chapter 4), followed by thepresentation of causal chains linking planning, construction, operation, and decommissioningactivities to project aspects, environmental and social impacts, and mitigation measures(Chapter 5). The main steps of the EIA process are covered, with guidelines for scoping (Chapter6), establishing baselines, and predicting and determining the significance of impacts(Chapters 7 and 8). Impact mitigation measures are also presented (Chapter 9). A chapteris devoted to presenting the step-by-step process for assessing cumulative impacts as partof an Environmental Impact Study (Chapter 10). Finally, general guidelines for follow-upand recommendations for environmental and social monitoring are presented (Chapter 11).A glossary of the main terms used complements the Guide. We hope that this Guide will contribute to an offshore wind energy developmentmodel that effectively adheres EIA best practices, is fully aligned with global commitmentsto protect the ocean and biodiversity, and respects local communities. São Paulo, Austral autumn 2026