At the global level, humanity is faced with the problem of excessive consumption of energy resources. The challenges of the energy sector are complex: capitalizing on renewable energy sources, reducing energy consumption from fossil sources, increasing energy efficiency measures to reduce energy consumption, as well as reducing CO2 emissions. In recent years, energy efficiency is one way we have to contribute to maintaining the sustainability of the planet. Energy is an input like any other used in the production process, no doubt for this reason, what is sought with its efficient use is to produce more while spending less energy. Energy efficiency is generally based on the optimization of consumption, which involves the search for the lowest energy intensity, a "rational use of energy", through more efficient processes and means. The objective of the study is to analyze the opportunities offered by energy efficiency as well as intelligent solutions adapted to the conditions of the national economy. The hypothesis is formulated starting from the results presented in the literature analysis section and consists in the fact that one of the basic rules of the energy efficiency transition is the exploitation of renewable energy sources in new resources for other industries.