The data only includes those meters for which Energy Sparks is receiving data. Some schools are in the process of installing or upgrading meters. These are not included in the totals. Also excluded are meters for which data is either no longer available, or is not yet available. So the total number of meters will be higher and is regularly changing. The vast majority of these meters are half-hourly AMR meters. Chart and data licensed under a CC-BY 4.0 licence.