The energy-related issues have become of paramount importance in recent years due to the exhaustion of fossil fuel resources, their price variations and political dependence on nations with role of energy providers. In addition, the changing in climate conditions requires reduction emissions of greenhouse gases. Therefore, this paper proposes and assesses the novel idea of using constructions as a unit of analysis for corpus-based discourse analysis in the energy field. This article will use a standard method in linguistics to quantitatively investigate academic writings from both a lexical and a stylistic perspective. The present research paper aims to add to the knowledge about energy issues by conducting a data-driven analysis of economic academic discourse, through three periods of time and using secondary data analysis. The findings suggest the evolution of the energy sector throughout time and they gave interesting and different insights into the content of the discourses and enabled better comparison of corpora.