Washed coal is coal that has undergone a cleaning process to remove impurities such as ash, sulfur, and other minerals. This process enhances the coal's quality, making it more efficient for burning and reducing harmful emissions when used as fuel. The washing process typically involves water and various chemicals to separate the unwanted materials from the coal. The primary benefit of washed coal is its higher energy content compared to unwashed coal, which means it produces more heat and requires less quantity for the same energy output. This makes washed coal a preferred choice for power plants and industries that rely on coal for energy production.