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The challenges of power quality are an emerging topic for the past couple ofyears due to massive changes occurring in low voltage distribution networks,being even more emphasized in the years marked by the novel COVID-19 diseaseaffecting people's behaviour and energy crisis increasing the awareness andneed of end-users energy independence. Both of these phenomena additionallystress the need for changes in distribution networks as the traditionalconsumption patterns of the end-users are significantly different. To overcomethese challenges it is necessary to develop tools and methods that will helpDistribution System Operators (DSOs). In this paper, we present a geographicinformation system (GIS)-based tool that, by using open source technologies,identifies and removes errors both in the GIS data, representing a distributionnetwork, and in the consumption data collected from the smart meters. Afterprocessing the initial data, a mathematical model of the network is created,and the impact of different electricity consumption scenarios on power quality(PQ) indicators voltage magnitude, voltage unbalance factor, and total voltageharmonic distortion are calculated. The results of simulations are visualisedusing a GIS tool, and based on the results, time periods that are most affectedby the change of end-users behaviour are detected. The potential of theend-users in the PQ improvement is investigated and an algorithm that shiftsconsumption to more adequate time periods is implemented. The results show thatthe pandemic negatively affect all analysed PQ indicators since the change inthe average value of PQ disturbances increased both during the hard andpost-lockdown period. The time-shifting of consumption shows significantpotential in how the end-users can not only reduce their own energy costs butcreate power quality benefits by reducing all relevant indicators.

A geographic information system-based modelling, analysing and  visualising of low voltage networks: The potential of demand time-shifting in  the power quality improvement