Harbin Electric Corporation has developed intelligent power island operation and maintenance systems based on its extensive experience in equipment design, production, and operation and maintenance. With more precise, widely applicable, and timely algorithms to provide effective feedback on equipment operating status, these systems achieve energy saving and emission reduction and optimal control objectives under various operating conditions of the main equipment. They are suitable for various power generation fields, including wind power, hydropower, biomass, and thermal power. It has been successfully applied at many power plants, including the Dehui Biomass Power Plant, the Fuyuan Xifeng Power Plant, the Three Gorges Power Plant, and the Datang Leizhou Power Plant.