GTESS develops standards in the areas of energy management and energy management systems. GTESS standards are designated with “MSE” in the prefix, which refers to “Management System for Energy”— a tribute to the very first American National Standard developed and published by GTESS, ANSI/MSE 2000-2000 A Management System for Energy. The public links on this page provide access to public announcements on GTESS standards activities, a listing of ANSI-approved MSE Standards, information on how to request a formal interpretation of a current MSE Standard, along with information on how to contact GTESS.