The Energy Technology List (ETL) is a scheme featuring over 8,000 independently verified and accredited energy efficient products across 62 sub-technology groups, backed by the Department for Energy Security and Net Zero (DESNZ). The ETLhelps contribute to net zero goals by increasing access to stringently tested. Purchasers can use the ETLto source and compare independently verified and accredited energy-saving equipment: 1. find out more and browse. At the request of users and purchasers from the Energy Technology List (ETL), we have worked with NBS to map the 140 ETLproduct categories against the UNICLASS codes: 1. Manufacturers and suppliers of energy-saving technology can apply to have their products listed on the ETLfor free: 1. find out more and register your.