*Limitations of the Study*

The analyses carried out do not take into account the volumes of electricity generation from different sources in the countries studied, and thus, weights reflecting the variation in energy production potential between the countries studied as a derivative of differences in economic potential and wealth were not used. The latter two issues are taken into account in the panel study part of the article; however, the data on electricity production are calculated on a per capita basis. Further research is needed to find a model that would allow for extending the analysis to include aspects of differences in the volume of electricity generation potential between EU countries, which would provide a better background for considering the structure of sources used for electricity generation.

**Author Contributions:** Conceptualization, R.H., A.H., E.Z.-R., G.V.; methodology, R.H., A.H., E.Z.-R., G.V.; software, A.H., E.Z.-R.; validation, A.H., E.Z.-R.; formal analysis, A.H., E.Z.-R.; investigation, R.H., A.H., E.Z.-R., G.V.; resources, R.H., G.V.; writing—original draft preparation, R.H., A.H., E.Z.-R., G.V.; writing—review and editing, R.H., A.H., E.Z.-R., G.V.; visualization, R.H., A.H., E.Z.-R., G.V.; supervision, R.H., A.H., E.Z.-R., G.V.; project administration, R.H., A.H., E.Z.-R., G.V.; funding acquisition, R.H., A.H., E.Z.-R., G.V. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
