This presentation discusses how desktop analyses of energy reduction programs may overestimate savings and return on investment. It uses a case study of an energy management project with Jardine Motors Group to illustrate this. Monitoring of the site found actual energy usage and potential savings were lower than projected. As a result, the realized return on investment and payback period were longer than the desktop analysis suggested. The presentation emphasizes the importance of considering operational realities and not just energy data in projecting savings.