Lazarus, Ian JosephKanyinda, Kabuya2021-08-182021-08-182021-03https://hdl.handle.net/10321/3645Submitted for the fulfilment of the requirement for Master of Engineering in Industrial Engineering, Durban University of Technology, Durban, South Africa, 2021.Improving energy use in a commercial building has become the subject of great importance in organizations worldwide. Improving energy usage refers to the efforts to reduce energy consumption. Reducing energy consumption in commercial buildings can be accomplished through continuous supervision using appropriate managerial techniques. Commercial companies are required to use energy more efficiently and participate in energy improvement. This study seeks to improve electrical energy consumption in commercial buildings by Analysing the electrical data consumption and identifying the factors that contribute to high consumption using Six Sigma DMAIC (Define-Measure- Analyse-Improve-Control) problem solving methodology. A case study was used to validate the DMAIC framework. Two years of electrical consumption data of a case study done from January 2018 to December 2019 was collected and analysed. The study revealed an average increment in energy consumption of 3.9 %. The outcomes using statistical Pareto chart showed that the boiler is the highest significant energy user in the building with 38.3% due; followed by the kitchen with 24.2 %, followed by DB A and lifts with 20,1 % and the rest with 17.37 %. After the campaign of DMAIC, there was a reduction of 6 % in boiler consumption which was 2.3 % reduction of total consumption of the month for the building. Therefore, the study successfully demonstrates how Six Sigma DMAIC methodology can be applied to improve electrical consumption in a commercial building and reduce its related costs.107 penCommercial buildingSix Sigma DMAICElectrical consumptionEnergy usageSustainable buildings--South AfricaEnergy consumptionBuilding--Energy consumptionElectric power--ConservationSix sigma (Quality control standard)Electric power consumptionThesishttps://doi.org/10.51415/10321/3645