Non-linear loads are one of the important factors that affect the quality of electric power to consumers. This load is a harmonic source that can reduce the quality of electric power. Non-linear load is generally a semiconductor component, where this load requires a current that is not fixed in the time period. UMY E2 building has a lot of energy saving equipment used such as LED lights, air conditioners (AC) that use VRF technology, computers and other electronic components which are included in non-linear load types. The research method used is a quantitative method. In this study, measurements were taken at the Sub Distribution Panel of E2 building and it was found that there was a maximum neutral current of 112.22 A due to unbalance, the value of Total Harmonic Distortion voltage on the R phase was 5.11%, the average S phase was 5.11 % and the T phase are on average 5.01%, and the value of the Total Harmonic Distortion of the minimum current in the R phase is 7.03%, the S phase is 6.25%, and the T phase is 6.75%. Voltage and current THD values do not comply with the IEEE 192-2014 standard. Based on the results of research and data analysis, to reduce harmonic planning is done to install a single tuned passive filter on E2 building