With worsening climate change worldwide, the use of coal energy must be reevaluated. Lessons from highly optimized experiences in developed countries, along with innovative statistical tools, are ready to be employed in the coal energy field. Leveraging these resources can enhance efficiency, reduce waste, and promote sustainable practices in coal utilization. This book provides a comprehensive overview of the coal energy industry in the 21st century. It includes six chapters organized into three sections on the past and future of coal energy, application of statistical tools, and application technologies. Chapters address such topics as the pros and cons of coal energy, current clean coal technologies, the application of statistical tools to improve productivity and effectiveness in the coal energy industry, utilization of waste coal fly ash, and more.