The integrated energy management system for the mail operations and buildings  is aimed at addressing aspects that contribute to the high energy consumption of the Post Office buildings. The approach to the  system emphasises on effectiveness and efficiency as tools that are capable of managing energy use in buildings. The South African Post Office’s study on “Measuring effectiveness and efficiency in mail operations and buildings: An integrated energy management system approach” was  used to determine the scope and benchmarking of the energy management system for mail operations and buildings.This study follows up  on  the  assembly of quantifiable data that will enable identification of opportunities on effective and efficient energy usage. Historical data on 27 mail centres was collected to determine the baseline and tracking trends of energy usage within buildings.  A survey was sent to employees occupying  the  mail centres to determine their behaviour towards energy usage. The implementation of the system will focus  on  high energy using buildings (mail centres) and later phased out to other buildings such as depots and retail outlets.  This continual improvement system will guide the efficiency and effectiveness indicators through measurable tools which will focus on occupation and utilization of energy in buildings.