A system energy efficiency controller connected (105) to at least one of an energy generation device (101), an energy storage device (102), an energy utilization device (103) and an energy regeneration device (104) is disclosed for enabling energy utilization. Said system energy efficiency controller (105) cooperatively controls the input and output of a ubiquitous energy flow of at least one of the energy generation device (101), the energy storage device (102), the energy utilization device (103) and the energy regeneration device (104). Said ubiquitous energy flow includes at least one of an energy flow, a material flow, and an information flow. Also disclosed are an energy efficiency gain device, an energy efficiency matching station and a smart energy service system, which are connected with the controller (105). The present invention optimizes the entire process of energy utilization using the system energy efficiency controller (105), thus improving the system energy efficiency.