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

Key data

Electricity and natural gas distribution and transmission companies face an open judicial front that directly affects their regulated revenues for the next six years. The CNMC published on 23 March 2026 a summons to interested parties in contentious-administrative appeal 4/330/2026, filed before the Audiencia Nacional against Circular 9/2025, of 22 December.

That circular amended Circular 2/2019, of 12 November, which established the methodology for calculating the financial remuneration rate for electricity transmission and distribution, regasification, and gas transmission. It also set the rate applicable to the 2026-2031 regulatory period. Now, a judicial appeal calls the entire remuneration framework into question.

What does this regulation establish?

The resolution published by the CNMC is not a substantive regulation: it is a procedural summons. Its purpose is to notify all persons and entities with a legitimate interest that judicial proceedings are underway and that they have a deadline to appear before the Audiencia Nacional.

The appeal has a dual purpose:

• To challenge the methodology for calculating the financial remuneration rate established in Circular 9/2025 for electricity transmission and distribution, regasification, and natural gas transmission and distribution activities.
• To challenge the specific financial remuneration rate set for the regulatory period 2026-2031 applicable to electricity transmission, system operation, and distribution.

Circular 9/2025 amended Circular 2/2019, which was the previous reference regulation for calculating these rates. The appeal challenges both the method and the numerical result applied to the new regulatory cycle.

Economic and operational impact

The financial remuneration rate is the parameter that determines how much regulated companies are paid for their network assets. A judicial modification of this rate — or of the methodology underpinning it — has direct consequences on the regulated revenues of distributors and carriers over six years.

The possible scenarios are:

• If the appeal is dismissed: Circular 9/2025 and the 2026-2031 rate become final. Companies can plan their regulated revenues for the period with certainty.
• If the appeal is partially upheld: the Audiencia Nacional could order the CNMC to recalculate the rate or amend the methodology, generating uncertainty over future revenues and possible retroactive adjustments.
• If Circular 9/2025 is annulled: the regulated revenues for the 2026-2031 period would be left without a firm legal basis, with a direct impact on the financial planning of the affected companies and an indirect effect on the tariffs paid by industrial and domestic consumers.

For industrial consumers with contracts linked to regulated tariffs, any alteration to network remuneration may translate into changes in access tolls and in the final cost of energy.

Who is affected?

• Electricity transmission companies (including system operation)
• Electricity distribution companies
• Regasification companies
• Natural gas transmission companies
• Natural gas distribution companies
• Industrial consumers with exposure to regulated electricity and gas tariffs
• Legal and financial advisors to the above companies, who must assess the advisability of appearing in the proceedings

Practical example

An electricity distribution company that has planned its regulated revenues for the 2026-2031 period using the rate set by Circular 9/2025 as a reference now faces legal uncertainty over that calculation basis.

If that company has a direct interest in maintaining the rate — because it considers it adequate to cover its capital costs — or in having it amended — because it considers it insufficient — the summons published by the CNMC opens the door for it to appear as an interested party in contentious-administrative appeal 4/330/2026 before the Audiencia Nacional.

Failing to appear means losing the ability to influence the outcome of the proceedings and to defend its position before the court. The deadline to appear is that established in the summons published on 23 March 2026. Allowing that deadline to pass without acting closes the door to procedural participation.

What should companies do now?

1. Assess whether they have a legitimate interest in contentious-administrative appeal 4/330/2026: any company whose regulated remuneration or energy costs depend on Circular 9/2025 must analyse its position.
2. Consult with legal advisors specialised in energy law to determine whether it is advisable to appear as an interested party before the Audiencia Nacional within the summons deadline.
3. Review financial planning for 2026-2031 incorporating the regulatory uncertainty scenario: regulated revenues based on Circular 9/2025 could be judicially modified.
4. Monitor the progress of the proceedings before the Audiencia Nacional to anticipate possible interim orders or judgments that may alter the current financial remuneration rate.
5. Industrial consumers: review contracts and exposure to regulated tolls, and include revision clauses if new energy contracts are negotiated during the processing of the appeal.

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-2026-6783