IntroductionThis dataset contains data captured from remote Power Quality logging devices currently available across 450 UK Power Network sites*. A weekly 95th percentile value per harmonic is calculated and the highest value of each harmonic amongst all weeks, over a period of 12 months (also applicable to THD) is shown. Methodological Approach Power Quality data is collected from meters on a 10-minute basis and stored in a database.  95th percentile statistics are calculated on a weekly basis and used to generate the harmonics report.Year-week is the ISO 8601 year and week number. Quality Control Statement The data is provided "as is". Assurance Statement Harmonic data is periodically extracted and reviewed prior to publication. Other Download dataset information: Metadata (JSON) Definitions of key terms related to this dataset can be found in the Open Data Portal Glossary: https://ukpowernetworks.opendatasoft.com/pages/glossary/To view this data please register and login.