At the Coal Power Plant the Electrostatic Precipitator (ESP) functions as a catcher of fine dust that is in the exhaust ducts from coal combustion. It is known that the ash attached to the electrode which has an electric charge is difficult to drop using a vibrator, by using the Power Off Rapping (POR) method, which is to temporarily turn off the electric charge on the electrode; the ash attached to the electrode plate will be more easy to miss. This research is a quantitative research that aims to determine the effect of the ESP operating method on energy consumption, determine the energy consumption ratio of each current setting, determine the dust capture efficiency ratio of each current setting and find energy saving opportunities using the following data analysis techniques. The energy consumption calculation used is only the energy consumption of the rectifier transformer on the electrostatic precipitator excluding hopper heaters, box heaters and rappers. After getting the test results from the current setting simulation, it can be concluded that the current setting of 20% is the most optimal setting in accordance with Ministry of Environment and Forestry Regulation No. 15 of 2019 the threshold limit for particulate exhaust gases at coal fired power plants is 100 mg/Nm³ where the dust reading value is 80.15 mg/m³. By using a current setting of 20%, a savings of 38.97% can be made for the operating method without POR and 41.88% for the POR operating method. If the difference in energy consumption is converted to rupiah by using the electricity tariff for large industrial groups (I-4/TT) of IDR 996.74/kWh, then the savings in electricity costs in 1 month of operation are IDR 176,802,877 without the POR method and IDR 189,988,881 with the POR method.