Judicial appeal against electricity remuneration 2026-2031: what distributors and large consumers must do

Key data

Electricity and natural gas transport and distribution companies operate under regulated revenues set by the CNMC each period. Circular 9/2025, of 22 December 2025, established the methodology and financial remuneration rates applicable to the 2026-2031 regulatory period, amending the previous Circular 2/2019. Now, an administrative appeal filed before the Audiencia Nacional — identified as case 4/338/2026 — calls that methodology into question.

The CNMC resolution of 12 March 2026, published in the BOE on 23 March, formally summons interested parties so they may join the proceedings. Failing to act has consequences: those who do not join lose the ability to defend their position if the court modifies the remuneration rules for the next six years.

What does this regulation establish?

The resolution published on 23 March 2026 is not a new economic regulation: it is a procedural act. The CNMC notifies interested parties that an active judicial appeal exists against Circular 9/2025 and gives them the opportunity to join the proceedings before the Audiencia Nacional.

To understand the scope, it is necessary to know what the challenged regulation governs:

The financial remuneration rate is the parameter that determines what return regulated companies may obtain on their assets. A change in this rate — upward or downward — has a direct impact on the annual revenues of distributors and transporters over six years.

Economic and operational impact

The regulatory uncertainty generated by this appeal has immediate and medium-term practical consequences:

• Regulated revenues at risk: Electricity distribution and transport companies plan investments and financing based on the revenues recognised by the CNMC. If the Audiencia Nacional modifies or annuls Circular 9/2025, those revenues could change retroactively or for future years of the 2026-2031 period.
• Network access tariffs: Large industrial consumers pay network access charges whose level is linked, among other factors, to the remuneration recognised for distributors. A change in methodology could alter those charges.
• Compromised financial planning: Six years of uncertainty over the remuneration rate makes it difficult to take investment decisions in electricity and gas infrastructure.
• Cost of not joining the proceedings: Companies that do not join the proceedings will be unable to put forward their interests or appeal the judicial ruling if the outcome is detrimental to them.

Who is affected?

• Electricity transport companies: Directly affected by the financial remuneration rate set in Circular 9/2025 for the 2026-2031 period.
• Electricity distribution companies: Their regulated revenues depend on the challenged methodology. They are the most exposed to a potential annulment.
• Regasification, transport and natural gas distribution companies: Circular 9/2025 also regulates the remuneration of these activities, so the appeal equally affects them.
• Large industrial consumers: A modification of the remuneration methodology may have an impact on the network access charges these consumers pay on their electricity bills.
• Investors and financiers of energy infrastructure: Uncertainty over regulated revenues affects asset valuations and the financing conditions of projects in the sector.

Practical example

A medium-sized electricity distribution company has planned its 2026 budget and investment projections through to 2031 based on the financial remuneration rate set by Circular 9/2025. With appeal 4/338/2026 being processed before the Audiencia Nacional, that company faces two scenarios:

• If it does not join the proceedings: It will be unable to submit arguments or provide evidence on the economic impact that a modification of the methodology would entail. If the court rules in favour of the appellant and reduces the remuneration rate, the company will not have been able to defend its position and will have to accept the outcome without having participated.
• If it joins as an interested party: It will be able to present its view on how Circular 9/2025 affects its business, defend the current methodology or, where appropriate, propose adjustments that protect its interests. This is particularly relevant if the company has significant regulated assets whose valuation depends on the remuneration rate for the 2026-2031 period.

The same reasoning applies to a large industrial consumer paying network access charges: joining the proceedings allows it to argue before the court which remuneration methodology is most favourable to the competitiveness of its business.

What should companies do now?

1. Assess whether they qualify as an interested party: Determine whether the company is a distributor, transporter or large energy consumer whose economic or regulatory situation would be affected by a modification of Circular 9/2025. If the answer is yes, there is a basis for joining the proceedings.
2. Consult with legal counsel specialised in energy law: The deadline to join administrative appeal 4/338/2026 before the Audiencia Nacional is a procedural deadline. Missing it means losing the opportunity to participate. It is urgent to verify the specific deadline with a specialist lawyer.
3. Analyse the economic impact of possible scenarios: Quantify what an upward or downward modification of the financial remuneration rate for the 2026-2031 period would mean for the company's revenues or costs. This analysis is necessary both to decide whether to join the proceedings and to prepare submissions.
4. Review financial and investment planning: Incorporate the regulatory uncertainty scenario into financial models. Investment decisions in infrastructure that depend on regulated revenues for the 2026-2031 period must account for the risk that the methodology may be modified.
5. Monitor the progress of the judicial proceedings: Whether or not it has joined, the company must follow the progress of appeal 4/338/2026 before the Audiencia Nacional, as any interim order or final judgment may have immediate effects on sector remuneration.

Official source

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, please consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-6782