Taking the performance evaluation of power systems as core, a new energy-saving management mode was proposed based on the routine and special evaluation for economic operation and energy-saving management of related systems and equipment. The technical reconstruction, maintenance, S&T planning and projects were proposed by means of current energy-consuming standard, identification and prediction of energy-saving potential. This mode integrated the science & technology management with the production management, such as operation, technical retrofit and maintenance. The solutions for several key supporting technologies were analyzed to build the energy-saving index system, technical standard system and information system. The scientific, complete and operational management system and technical supporting system were researched for the energy saving and consumption reduction of power generation groups. It laid a solid foundation to build the system of energy saving and consumption reduction.