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1. During the transitional period until 1 January 2027, the ENTSO for Gas shall develop the 2026 Union-wide network development plan for hydrogen, with the full involvement of hydrogen transmission network operators and together with the ENNOH as soon as it is established. The 2026 Union-wide network development plan for hydrogen shall consist of two separate chapters, one for hydrogen and one for natural gas. The ENTSO for Gas shall without delay transfer to the ENNOH all the information, including data and analyses it collected during the preparation of the Union-wide network development plans for hydrogen by 1 January 2027.

2. The ENNOH shall develop the 2028 Union-wide network development plan for hydrogen pursuant to this Article and Article 60.

3. The ENNOH shall cooperate closely with the ENTSO for Electricity and the ENTSO for Gas to develop integrated Union-wide network development plans pursuant to Articles 32 and 60 of this Regulation and to Article 30 of Regulation (EU) 2019/943 respectively. That cooperation shall include in particular the following:

(a) the ENNOH, together with the ENTSO for Electricity and the ENTSO for Gas, shall develop a single set of joint scenarios for the ten-year network development plans pursuant to Article 12 of Regulation (EU) 2022/869;

(b) the ENNOH, the ENTSO for Electricity and the ENTSO for Gas, working together, shall each develop coordinated infrastructure gaps reports within the framework of the Union-wide ten-year network development plans pursuant to Article 13 of Regulation (EU) 2022/869;

(c) within six months of approval of the joint scenarios report pursuant to Article 12(6) of Regulation (EU) 2022/869 and every two years thereafter, the ENNOH shall publish the infrastructure gaps reports developed within the framework of the Union-wide ten-year network development plans;

(d) the ENNOH shall draft a single sector draft methodology for an energy system wide hydrogen cost-benefit analysis and a consistent and progressively integrated model together with the ENTSO for Electricity and the ENTSO for Gas pursuant to Article 11 of Regulation (EU) 2022/869, which shall be consistent with the methodologies developed both by the ENTSO for Electricity and the ENTSO for Gas pursuant to Article 11 of Regulation (EU) 2022/869 and shall provide transparency with regard to the most cost-efficient solutions across energy carriers, including non-infrastructure-based solutions;

(e) the methodologies referred to in point (d) of this paragraph shall be applied for the preparation of each subsequent Union-wide network development plan for hydrogen developed by the ENNOH pursuant to Article 60 of this Regulation;

(f) the ENNOH shall develop the joint scenarios, infrastructure gaps reports, the single sector draft methodology and the integrated model in accordance with Articles 11, 12 and 13 of Regulation (EU) 2022/869;

(g) where decisions need to be made to ensure system efficiency as defined in Article 2, point (4), of Directive (EU) 2023/1791 across energy-carriers the Commission shall ensure that the ENTSO for Electricity, the ENTSO for Gas and the ENNOH cooperate closely;

(h) the ENNOH, the ENTSO for Electricity and the ENTSO for Gas shall cooperate in an efficient, inclusive and transparent manner, they shall facilitate taking decisions by consensus and they shall develop the necessary working arrangements for the purpose of enabling such cooperation and ensuring their fair representation. The ENNOH, together with the ENTSO for Electricity and the ENTSO for Gas, may establish working groups to fulfil its obligations pursuant to the first subparagraph, points (a), (b) and (d) and shall ensure fair and equal representation of the hydrogen, electricity and gas sectors in the working groups.