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1. The ENTSO for Gas shall elaborate network codes in the areas referred to in Article 71(1) and (2) upon a request addressed to it by the Commission in accordance with Article 71(9). The network code referred to in Article 71(2), first subparagraph, point (d), shall be developed jointly with the ENNOH.

2. The ENTSO for Gas may elaborate network codes in the areas set out in Article 71(1) and (2) with a view to achieving the objectives set out in Article 24, where those network codes do not relate to areas covered by a request addressed to it by the Commission. Those network codes shall be submitted to ACER for an opinion. That opinion shall be duly taken into account by the ENTSO for Gas.

3. The ENTSO for Gas shall adopt:

(a) common network operation tools to ensure the coordination of network operation in normal and emergency conditions, including a common incidents classification scale, and research plans;

(b) a non-binding Union-wide ten-year network development plan for natural gas referred to in Article 32 (the ‘Union-wide network development plan for natural gas’), including a European supply adequacy outlook, every two years;

(c) recommendations relating to the coordination of technical cooperation between Union and third-country transmission system operators;

(d) recommendations to transmission system operators on their technical cooperation with distribution system operators and hydrogen network operators;

(e) an annual work programme;

(f) an annual report;

(g) annual summer and winter supply outlooks;

(h) a gas quality monitoring report by 1 January 2025 and every two years thereafter, including developments of gas quality parameters, developments of the level and volume of hydrogen blended into the natural gas system, forecasts for the expected development of gas quality parameters and of the volume of hydrogen blended into the natural gas system, the impact of blending hydrogen on cross-border flows as well as information on cases related to differences in gas quality specifications or in specifications of blending levels and how such cases were settled, with a view to meeting the quality requirements of different end-use applications;

(i) an annual report including the quantity of renewable gas and low-carbon gas injected into the natural gas network. The gas quality monitoring report referred to in the first subparagraph, point (h) shall also cover the development for the areas listed in that point, as far as relevant for the distribution network, on the basis of information provided by the European entity for distribution system operators (the ‘EU DSO entity’) established pursuant to Article 52(1) of Regulation (EU) 2019/943 of the European Parliament and of the Council .

4. The European supply adequacy outlook referred to in paragraph 3, point (b), shall cover the overall adequacy of the natural gas system to supply current and planned demands for natural gas for the next five-year period as well as for the period between five and 10 years from the date of that outlook. The European supply adequacy outlook shall build on national supply outlooks prepared by each individual transmission system operator. The European supply adequacy outlook shall specifically provide for monitoring of progress on the annual production of sustainable biomethane. Where both the European supply adequacy outlook and the final updated integrated national energy and climate plans show that the annual production is not sufficiently progressing or that the natural gas consumption is not sufficiently decreasing in view of the available potential, the Commission may issue recommendations to the Member States, if necessary to achieve the objectives of the Energy Union, pursuant to Article 34 of Regulation (EU) 2018/1999. The Union-wide network development plan for natural gas shall include the modelling of the integrated network, including hydrogen networks, scenario development, a European supply adequacy outlook and an assessment of the resilience of the system. That plan shall promote the energy efficiency first principle and energy system integration.

5. The annual work programme referred to in paragraph 3, point (e), shall contain a list and description of the network codes to be prepared, a plan on the coordination of the operation of the network, and a list of research and development activities, to be realised in the course of that year, and an indicative calendar.

6. The network codes shall be developed for cross-border network issues and market integration issues and shall be without prejudice to the Member States’ right to establish national network codes which do not affect cross-border trade.

7. The ENTSO for Gas shall monitor and analyse the implementation of the network codes and the guidelines adopted by the Commission in accordance with Article 71(13) or Article 74, and their effect on the harmonisation of applicable rules aimed at facilitating market integration. The ENTSO for Gas shall report its findings to ACER and shall include the results of the analysis in the annual report referred to in paragraph 3, point (f), of this Article.

8. The ENTSO for Gas shall make available all information required by ACER to fulfil its tasks under Article 27(1).

9. ACER shall review national ten-year network development plans to assess their consistency with the Union-wide network development plan for natural gas. If ACER identifies inconsistencies between a national ten-year network development plan and the Union-wide network development plan for natural gas, it shall recommend amending the national ten-year network development plan or the Union-wide network development plan for natural gas as appropriate. If such national ten-year network development plan is elaborated in accordance with Article 55 of Directive (EU) 2024/1788, ACER shall recommend that the relevant regulatory authority amend the national ten-year network development plan in accordance with Article 55(5) of that Directive and inform the Commission thereof.

10. Upon request of the Commission, the ENTSO for Gas shall give its views to the Commission on the adoption of the guidelines as laid down in Article 74.

11. The ENTSO for Gas shall cooperate with the European Network of Transmission System Operators for Electricity (the ‘ENTSO for Electricity’) and with the ENNOH.