1. By 10 months after the entering into force of this Regulation all TSOs shall jointly develop a proposal for a common grid model methodology. The proposal shall be subject to consultation in accordance with Article 12.
2. The common grid model methodology shall enable a common grid model to be established. It shall contain at least the following items:
(a)
a definition of scenarios in accordance with Article 18;
(b)
a definition of individual grid models in accordance with Article 19;
(c)
a description of the process for merging individual grid models to form the common grid model.