The Energy Regulation Board (ERB) produces publicly-available annual reports of the performance of the Zambian interconnected power system (IPS) which include power quality (PQ) performance. Based on the reports covering the period 2015-2021, 1) identify the PQ parameters which are consistently being reported on; 13 2) plot the trends of compliance of performance on the identified PQ parameters for the identified period; [4 3) comment on the trends of compliance of performance on the identified PQ parameters for the identified period. [4