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Brazil has a predominantly renewable origin electricity generation matrix, with hydro generation accounting for about 69% of the supply. This paper promotes hydropower projects in Brazil environmental licensing procedure critical assessment, with the aim of identifying and assessing possible solutions to enhance the process, especially through Strategic Environmental Assessment (SEA) application to hydroelectric generation expansion planning processes. It was concluded that impact assessment has led to significant environmental improvements, as it is capable of preventing, controlling and compensating significant – and very often irreversible – environmental impacts, especially through projects optimization and environmental programs that were not initially foreseen in the EIA inclusion. However, as has been expounded throughout this study, there are still several gaps and limitations in the current process, both in power generation expansion planning aspect and project environmental impact assessment aspect. SEA application in the planning phase could contribute to facilitate and simplify hydroelectric plants licensing. Many currently compulsory stages that are carried out after the request for a prior license, such as the consultation made to involved entities and the area environmental diagnosis could already be commenced in the planning phase. [ABSTRACT FROM AUTHOR]