The approach proposed in this paper emphasizes the methodology of examining the possibility of increasing energy efficiency in the case of industry, such as a petrochemical complex, which is at the same time marked as the major pollutant of the environment. The improved cleaner production methodology was used based on the conditions and needs of the major Serbian petrochemical company. This paper presents results obtained by steam system optimization and modifications. The implemented measures lead to a decrease in total energy consumption by 6% and a decrease in greenhouse gas emissions by 9 t CO(2)e.