The book delves into the nascent field of renewable energy support law, with a focus on the European Union (EU). It critically interprets and analyses the rules and the legal system that govern the finance of renewable energy projects in the EU. The book scrutinises the different types of support schemes and elucidates how they work, what effects they generate, and how they have been applied in practice. It expounds the impact of EU secondary legislation on national renewable energy support policies, distinguishing three aspects: selection, design, and implementation of support schemes. For a complete comprehension of the field, the legal analysis is combined with law and economics analysis. Recent initiatives for the financing support of renewable energy projects at the EU level (EU Renewables Financing Mechanism, Hydrogen Bank, and ‘Auctions as a Service’) are also appraised and broader recommendations for the future consolidation and development of EU renewable energy support law are proposed. The book fills a gap in the study of the law governing the finance of renewable energy projects, and it is a valuable companion for jurists, both practitioners and academics, as well as for professionals and students who wish to decode the law of finance for renewable energy sources.