This chapter relates to renewable energy disputes. ‘Renewable energies’ are understood in a broad sense as energy resources which are naturally replenished on a human timescale. The chapter focuses on wind and solar photovoltaics (solar PV) energy, describing typical project and contract structures, as well as challenges and disputes relating to their financing; development; construction; and operation, maintenance, and service. It pays special attention to questions relating to the individual contractual relationships between the project company, the project developer, the contractor(s), sub-contractors, and sub-suppliers. The chapter also contains a detailed, user-oriented analysis of the advantages and disadvantages relating to arbitrating commercial disputes in this sector.