Within OEN a data base of the main energy indicators at the national level, including primary energy, final energy and electricity intensity indicators, by economic sectors and industrial branches has been carried out and further developed.The paper presents the evolution of final energy and electric energy intensity of the manufacturing industry in Romania and of its representative branches. The analysis underlines the fact that the evolution differed from one branch to another. Thus, in the energy intensive industries, energy intensity has diminished. In the manufacturing industry, energy intensity has diminished due to a certain diminishing in the share of the activities in the energy intensive industries and a decrease in energy intensity in the food industry and other branches that have lower energy intensity.