The purpose of this publication divided into two parts is to interpret one of the most difficult provisions of the European Union treaties contained in the second subparagraph of Article 194(2) of the Treaty on the Functioning of the European Union introducing national energy sovereignty. Reference to Article 192(2)(c) in the second subparagraph of Article 194(2) shall be understood as meaning that if, when adopting measures in the environmental field, the energy objectives (Article 194[1]) do not prevail over the environmental ones (Article 191) and at least one of the conditions required for national energy sovereignty is met (the second subparagraph of Article 194[2]), then Article 192(2)(c) shall be invoked as the Treaty basis (unanimity of the Council). Only in the event that none of the three alternative conditions required for energy sovereignty are met and the energy goals prevail over the environmental ones, the ordinary legislative procedure provided for in the first subparagraph of Article 194(2) shall be followed. The “communitarisation” of energy sovereignty merely involves taking the energy solidarity into consideration (Article 194[1]) and adopting measures appropriate to the economic situation on an ad hoc basis (Article 122[1]) whilst taking into account the Declaration on Article 194 of the Treaty on the Functioning of the European Union, which by referring to two treaty provisions strengthens the energy independence of Member States during a crisis within the meaning of Article 347 to such extent that in practice it necessitates at least a revision of the ‘Fit for 55’ package proposed by the European Commission. In accordance with the second subparagraph of Article 194(2) in conjunction with Article 194(1) the energy transformation shall take place on a national and not the EU level whilst at the same time taking into consideration the energy solidarity principle enshrined in the EU treaties, which has been rejected by Germany before the Court of Justice of the European Union (Germany v. Poland, C-848/19 P) in order to increase EU’s reliance on the supplies of Russian gas. The ‘Fit for 55’ package completely ignores these provisions despite the fact that according to some of the legislative proposals contained therein such regulations are applicable. Not only the Polish literature lacks publications on the Treaty basis of conclusions included in the ‘Fit for 55’ package.