This paper tries to analyze after the energy crisis of recent years how energy policy in the sector of the European Union has developed after the Treaty of Lisbon and what role the principle of solidarity has played in this sector. The role of jurisprudence is once again definitive, evolutionary, precise and clear to give new ideas for thought and criticism in the energy sector. Regulatory developments on the subject after the conflict of the Russian Federation in Ukraine paves the way for a broad discussion as well as a basis for the development of energy protection and security in the sector of the European Union for new generations.