This report focuses on the need for Latin America and the Caribbean (LAC) to find energy sources that emit little or no carbon, looking at the viability of hydroelectric power as a low-carbon energy source in a changing climate. It provides general information on hydropower in LAC and guides on two advanced water and energy resource planning tools that allow users to address freshwater management challenges and allocate limited water resources, with full integration of supply-demand questions, water quality and ecological considerations.