In Today’s world Power energy efficient monitoring system is most important. Power electronics based Power energy efficient monitoring system used here The PEEMS includes batteries and a digitally controlled single-phase voltage source inverter (VSI), which can be controlled as a current source or a voltage source depending on the status of the ac grid and the user’s preference. The PEEMS guarantees that the critical loads are powered when the ac grid fails; in which case, the VSI is controlled as a voltage source. It also accomplishes peak power control by supplying battery power to the local loads while they are powered by the ac grid if the loads get large. The electricity cost savings done by peak shaving are estimated. We are using microcontroller based power efficiency circuit that can be controller power and show the windows screen power unit and total load how much power using day to day. A RMS value and current transformer using and average value count to load that is simple way to show the power.Atmega328 circuit and Mosfet-IRZ-44 and 100k resistor load circuit and 16x2 lcd screen. 16Mhz frequency of power. In order to provide power to critical loads when the ac grid fails, the EMS detects grid failure and acts as a voltage source for the critical loads. In this mode of operation, The disturbance in the voltage waveform is noticeable when the EMS reconnects the ac grid to the loads as. There is also an inrush current into the diode rectifier because the dc voltage of the rectifier had sagged some during islanding mode. Note that the ac voltage produced by the EMS during the islanding mode is slightly smaller (about 7%) than the ac grid voltage.