IEC 62053-24:2014+A1:2016 applies only to newly manufactured transformer operated static var-hour meters of accuracy classes 0,5 S, and 1 S as well as direct connected static var-hour meters of accuracy class 1, for the measurement of alternating current electrical reactive energy in 50 Hz or 60 Hz networks and it applies to their type tests only. It uses a conventional definition of reactive energy where the reactive power and energy is calculated from the fundamental frequency components of the currents and voltages only. This consolidated version consists of the first edition (2014) and its amendment 1 (2016). Therefore, no need to order amendment in addition to this publication. The contents of the corrigendum of March 2018 have been included in this copy. Keywords: smart grid; smart meter; smart energy