This open access book explores the complementarity of hydropower with new energy sources such as solar and wind in the global energy transition. It analyzes the technological advantages, environmental impacts, and economic potential of combining hydropower and new energy sources, while examining the related policies and market mechanisms. Through a multidimensional approach, the book demonstrates the importance of this energy integration in improving energy system efficiency, reducing carbon emissions, and promoting sustainable development. Starting with the challenges and strategies of technology integration, the book will explore the role of smart grid management and energy storage technologies in this context, providing quantitative and qualitative assessments of the ecosystem and socio-economic impacts of such energy synergies. Valuable knowledge and practical guidance for energy researchers, policy makers and professionals in the field of sustainable development.