Many countries utilize their resources at optimal capacity in fostering countries’ economic growth without any concern on environmental impact. Even though the importance of environmental issue as one of the important aspects in sustainable development is fully understood, the economic growth still remained as the priority target. In Indonesia, industry is one of the important sectors both in term of its contribution to national output and national energy consumption. Based on Indonesian Statistic Bureau, industry is always at the top list of contributor of national energy consumption since 2000. This paper employs the decomposition analysis to calculate what factors contribute to the change in energy intensity. We also conduct a panel data analysis to investigate the determinants of energy intensity using firm level data. The result suggests that, even though the industrial sector’s energy intensity is higher than national level, it varied across sub sectors within the industry. Meanwhile, the econometric analysis suggests that wage, age, capital intensity and share of capital owned by private sector have positive impact on energy intensity, whereas size of firms, labor productivity and technology intensity has negative impact on energy intensity.