In cloud computing environment, power consumption is a critical factor for data centers. Effective power consumption control can improve significantly benefit for providers. In this paper, we derive from CloudNFV architecture, an open platform for implementing Network Functions Virtualization based on cloud computing and Software Defined Networking, to obtain an optimal power control strategy toward reducing CO ₂ emissions and maximize total utility of active resources. We propose a consolidation function for determining the On/Off strategy of each server and use live migration method to rearrange virtual machines in active resource components. The efficiency of our proposed model is demonstrated on the simulation environment.