This book systematically analyzes the development status of the global hydropower industry in 2019. Taking the United States and China as typical countries, it sorts out the evolution trends of hydropower installed capacity and power generation in the two countries in the past ten years. It also analyzes hot issues in the global hydropower industry from aspects such as water costs, investment, employment, and industry. Unless otherwise specified, the Chinese statistical data in this book do not include data from the Hong Kong Special Administrative Region, the Macao Special Administrative Region and Taiwan Province. The data on installed hydropower capacity and power generation include pumped storage data. This book can be used as a reference for technical and managerial personnel engaged in the fields of renewable energy and water conservancy and hydropower engineering, as well as teachers and graduate students majoring in energy engineering, energy management, water conservancy and hydropower engineering, and public policy analysis in colleges and universities.