Frontier Energy System and Power Engineering FESPE 1 Vol. 1, No. 2, July 2019, pp. xx-xx Study of Technical and Non-technical Factors in Energy Consumption on 20 kV Distribution Networks Mikael Abimanyu Putra Pamungkas 1 , Dwi Priharto 1 , Hari Putranto 1 1. Introduction Electrical energy is the primary energy to operate devices that needed electricity. Many industrial, housing, offices, and commercial devices require electricity. The development of industrial, housing, offices and commercial sectors increases the demand for electricity [1]–[4]. The massive electricity demand in the city area is caused by its industrial, office, housing, and commercial aspects. East Java is a province with significant electricity demand due to the development in those sectors. The electricity demand in East Java experiences a surplus. Currently, the demand reaches 2,800 MW and is predicted to reach 6,000 MV load. With the high development, electrical power needs to be increased to meet the demand. To meet the increasing demand, there are several factors to be considered, one being the power loss. Power loss can be seen in the various electricity network, from generation, transmission, and distribution. There are two types of power loss: technical and non-technical. Technical loss is a loss that occurred due to the impedance from the generation, transmission, and distribution devices so that consumers received less energy than what is sent by the generator [5]–[8]. The non-technical loss occurs due to non-technical issues such as errors from the reading of electric measuring devices, inappropriate calibration errors, electric theft and other errors outside of technical matters. The electrical energy in Indonesia is managed by the government, it is a state-owned enterprise that is engaged in the field of electricity supply. The operation is divided into various areas to manage the generation, transmission and load management, and distribution for consumers. However, there are separated into units for areas that are interconnected in Java-Bali. 2. Main Current Research The distribution section consists of several network service area as sub-units around Indonesia. This functions as a customer service and distribution electricity network [3], [9]–[11]. This system supervises district subunits. Then, the district serves to help manage the distribution network services closer to the consumers. APJ Pasuruan supervises several district units; they are Prigen, Pandaan, Bangil, Sukorejo, Pasuruan City, Gondangwetan, Grati, Probolinggo, and Kraksaan Districts. The electricity distribution network is divided into two, primary and secondary electricity distribution networks. The primary electricity distribution network is also called the medium voltage; it is a network that connects the main substation with distribution substation, usually uses distribution voltages of 6 kV, 7 kV, 12 kV, and 20 kV. The secondary electricity distribution network is also called the low voltage; it is a network that connects the distribution substation with consumers [4], [4], [9]. The primary electricity network is a three-phase while the secondary distribution network which is a single-phase and three-phase four-wire. In Indonesia, the universal voltage is 380/220 V. Authors Abstract 1 Department of Electrical Engineering Universitas Negeri Malang, Indonesia. Corresponding: Mikaelabimanyu@gmail.com This research aimed to find the technical and non-technical losses that occurred on the 20 kV Tawangrejo Feeder network by calculating the electricity losses after measurement and the calculated losses, made an application to calculate the losses, and determined the improvement alternative from the suitable electricity losses. Based on the data analysis, the conclusions were: Tawangrejo Feeder used mesh configuration with a three-phase four-wire construction model. The values of power and energy losses in total, technical, and non-technical were fluctuating, depended on the current value that was sent from the primary substation to the load. This power loss calculation application had a high accuracy because the error occurred at a maximum of 0.0021%. The most effective power loss improvement was replacing the conductor duct that reduces 56% of power and energy losses. Keywords The distribution network, Energy consumer, Technical losses, Power system