Key words: capital structure determinants; renewable energy companies; leverage; trade-off theory; pecking order theory Purpose: The main purpose of this master thesis is to determine the factors that significantly influence the capital structure decisions in the global renewable energy sector during the period 2005-2013. Methodology: This study is implemented through a quantitative approach, using a panel data model, in which leverage is the dependent variable, controlled by a set of firm-specific, industry-specific, tax-related and macroeconomic independent variables. Theoretical The study is inspired by prior researches, which test capital structure Perspectives: determinants and whether the trade-off or the pecking order theory explai...