en2015-08-18 17:29 PM CESThttp://inspire.ec.europa.eu/codelist/ElectricityAppurtenanceTypeValue/primaryMeter:1http://inspire.ec.europa.eu/codelist/ElectricityAppurtenanceTypeValue/primaryMeterPrimary meter.Primary meters are installed if commercial customers elect to have power delivered at distribution voltages, such as 12.5 kV. Residential customers are generally billed for kilowatt hours (kWH) used. Commercial and industrial customers may additionally be billed for demand charges and power factor charges.