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Multi-User Multiple Input Multiple Output(MU-MIMO)systems require larger number of antennas at base station,serving greater number of terminals,with enormous gains in the form of spectral and energy efficiency.The energy efficiency of MU-MIMO system depends on data rate and overall power consumption of the system.In this work,we have optimized the energy efficiency by using zero forced linear pre-coding schemes during downlink and uplink.We have proposed an improved power consumption mod-el(for single cell and multi-cell environments)that con-siders the power required for liner processing,power amplifier and circuit components at user terminals and the base stations.This model provides considerable improvement in the results.