Corruption in the energy sector may take many forms from petty corruption in meter reading and billing to grand corruption in procurement processes and contract administration. In the hydropower sector, specific corruption risks are associated at all stages of the project cycle from the early stage of selection of electricity options and hydropower sites to the contracting, construction, operation, maintenance and rehabilitation or decommissioning phases of the project. Six key actors are identified that can jointly engage in efforts against corruption in this sector, including international donors, export credit agencies and commercial banks, national governments, civil society, private sector companies as well as intergovernmental systems and international legal systems. Their respective role to combat corruption is explained in this expert answer.