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Electrical distribution is the last stage in the delivery of electricity to consumers. The distribution system conveys electricity from the transmission network to consumers through distribution transformers. It is the feeblest tie in the power sector value chain, and the most opened to the critical observation of its users. While power generation sub-sector is struggling to meet up with increasing demands, the distribution sub-sector has been reeling under losses [1]. Power system losses are wasteful energies due to internal or external factors that are dissipated in the system. Radial distribution system has only one source of power for group of electricity consumers. Its network leaves the substation and passes through the network area with no usual connection to any other supply [2]. No matter how carefully the power system is designed, losses are inevitable. Therefore, evaluation of these losses is of paramount importance. If there is a genuine baseline for computation of these losses, utilities can take steps to limit or minimise them, and this will lead to gross reduction in the cost of operations and consequently, gross reduction in the cost of electricity to consumers. Aggregate Technical and Commercial (AT & C) losses is the appropriate index used in a situation where the system is associated with losses which occur due to various reasons [3], [4]. AT & C losses are the difference between energy injected into the system and the energy for which payment is made. It is the aggregate of the Transmission and Distribution (T and D) losses and loss due to nonrealization of payable demand [5]. In Nigeria, as contained in [6], the concept is referred to as Aggregate Technical, Commercial and Collection (ATC & C) losses. ATC & C losses were adopted by Nigerian Electricity Regulatory Commission (NERC) during the Nigerian Electricity Distribution Companies privatisation in the year 2013 as one of the criteria for identifying the most preferred bidders. That is, the buyers with the most aggressive but feasible ATC & C loss reduction trajectory over a 5-year period were considered. Notwithstanding, it is hoped that in this paper, various feeders in the network area and their nomenclatures will be identified, energy import and export points of the network area will be established and a methodology for evaluating losses of the network under study using the index ATC & C losses will be developed. Abstract: Radial system is the most common type of distribution system in developing countries of the world with inherent losses along the line. Aggregate Technical, Commercial and Collection (ATC & C) Losses as an index to indicate losses in the power system is trendy as it provides clear picture of both energy and revenue loss conditions. This paper presents a pragmatic feeder-wise methodology for establishing Aggregate Technical, Commercial and Collection (ATC & C) losses in a typical Nigerian distribution system. The case chosen for this study is an area covered by Life Camp Area Office of Abuja Electricity Distribution Company (AEDC) of Nigeria. The analysis was achieved through extensive field survey and critical study of the schematic diagram of the network area. This study, of course, serves as a working tool to seasoned fieldworkers and utilities when appraising distribution system losses.

Methodology for Evaluation of Aggregate Technical, Commercial and Collection (ATC & C) Losses in a Typical Radial Distribution System