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Energy efficiency is a very current topic, both locally and internationally. It follows that methodologies to improve efficiency are also gaining importance. In the context of the local utility Eskom, Demand Side Management and improved Energy Efficiency in particular have been identified as major components of the campaign to reduce the negative impacts of the current constraints in generation and transmission capacities. Manual methodologies, however, are time-consuming, error-prone and require highly skilled manpower. This paper describes the development of an energy auditing tool to assist in improving the energy auditing process together with a methodology for calculating the usage-profiles of the various loads. The theoretical results are also presented.