The Ekt's - Virtual Infrastructure Green meteR is a set of scripts for estimating, in real time, and with appropriate assumptions, the power savings a virtualization/cloud computing infrastructure achieved in comparison to an non-virtualized equivalent system. E-vigr can calculate power consumption savings over XEN and VMWARE based virtual infrastructures, independently of specific h/w vendors. It applies real time power metering of the physical servers, comprising the virtual/cloud infrastructure, virtualized infrastructure platform information, a projected power consumption of virtualized servers, based on collected performance metrics.