This study presents an assessment of Indonesia's energy security performance through measurement of its energy security index for the selected years of 2008-2013. This study conceptualizes energy security as consisting of five dimensions: availability, affordability, accessibility, acceptability and efficiency. These dimensions are selected through a review of energy security concepts that are widely used in previous publications. The dimensions are composed into 14 indicators used to assess energy security. This study analyzed 71 countries to assess the energy security performance. The indicators were normalized using the min - max method and weighted based on principal component analysis or equal weighting. Based on the analysis, Indonesia's energy security performance shows an increasing trend between 2008 and 2013; this increase was due to the improvements of the availability, affordability and accessibility dimensions. The average value of Indonesia's energy security index throughout the selected years is 0.473. The ESI result from 71 countries shows that Indonesia ranks 55. (C) 2016 Elsevier Ltd. All rights reserved.