NIS2 Recital 17

Member States should be able to decide that entities identified before the entry into force of this Directive as operators of essential services in accordance with Directive (EU) 2016/1148 are to be considered to be essential entities.

NIS2 is a Directive: the binding obligations live in each Member State's transposing national law, and this is the EU Directive text those laws implement.

Source text: EUR-Lex, Official Journal HTML (CELEX 32022L2555). The parser was validated against the anchor articles verified in REP-08.