The report first provides an overview of existing indices and objectives and then presents power quality data gathered by the working group from several different countries across a number of monitoring points over a number of years.The WG recommendations are given. Concerning harmonics, flicker and voltage unbalance, site and system indices and objectives are given for planning levels and for future voltage characteristics at HV and EHV. Concerning voltage dips and interruptions, indices are given with reference to various standards for enabling performance to be assessed and reported in a consistent manner.