This study observes the factors affecting the changes of energy intensity in Indonesia and five selected Association of South East Asian Nations (ASEAN) countries during the period (1971-2016) particularly measuring its impact during 1997 financial crisis. By employing the Logaritmic Mean Divisia Index, this study summaries that the changes in energy intensity in the ASEAN-6 economies was a result of the changes within industry energy intensity (intensity effect). The intensity effects also provide a proxy measure of energy efficiency activity at the sectoral level. Overall, the general direction of the intensity effect in all ASEAN countries is downward. | Examining the driving forces affecting energy intensity during financial crisis Evidence from ASEAN-6 countries -