Spain: Key Regulatory Developments in the Energy Sector in the Second Quarter of 2025

During the second quarter of 2025, the energy sector’s regulatory framework was marked by an unprecedented event: the April 28 blackout, considered one of the most serious incidents in recent years in the peninsular electricity system. This event triggered intense regulatory activity aimed at strengthening resilience, ensuring security of supply, and adapting the system to the new demands of the energy market.

In this article, we review the main regulatory developments approved between April and June 2025, both in the electricity and natural gas sectors.

Urgent measures after the blackout: Royal Decree-Law 7/2025

Royal Decree-Law 7/2025 , approved on June 24, introduces a set of measures structured around three axes: voltage control, storage, and system flexibility. Among other measures, it highlights:

• Strengthening supervision by the CNMC and the system operator.
• Enabling storage infrastructure as public utility facilities.
• Reduction of administrative deadlines for repowering or hybridized facilities.
• Promotion of figures such as the self-consumption manager and the independent aggregator.
• Regulatory adaptations for the electrification of air conditioning, mobility, and industry.

Technical resolutions to improve system operation

Multiple resolutions have been approved that have a direct impact on the daily operation of the electrical system, including:

• The CNMC Resolution of June 12, 2025 , which regulates a new voltage control service with zonal markets for additional reactive capacity.
• The Resolution of March 28, 2025 , which implements the settlement of deviations with quarter-hourly resolution (15 minutes), in line with the European framework.
• The Resolution of April 2 , which establishes the method for submitting dynamic information on electric charging points, in compliance with the Climate Change Law.

Advances in the regulation of natural gas

In parallel, significant changes have taken place in the gas system, with the aim of adapting to the new European framework and facilitating the integration of renewable gases:

• Circular 2/2025 : new conditions for access and capacity allocation, with a focus on biomethane and hydrogen.
• Circular 5/2025 : development of the Regulatory Cost Information System in distribution.
• Circular 3/2025: Update of incentives for the technical manager of the system.

In addition, tolls and compensation for the 2026 gas year have been approved.

New lines of aid: investment, storage and circular economy

The second quarter also saw the activation of new grants under the Recovery, Transformation, and Resilience Plan:

• Royal Decree 534/2025: €931 million for strategic projects in the electricity transmission network.
• Order TED/535/2025 : aid for innovative storage projects (stand-alone, thermal, pumped and hybrid).
• Order TED/542/2025 : promoting the circular economy of renewable capital goods (Renocicla Program).

Finally, several public consultations and regulatory projects currently underway stand out, such as the review of gas remuneration methodologies and energy planning linked to efficiency, mobility, and networks.

By Marimón Abogados, Spain, a Transatlantic Law International Affiliated Firm.

For further information or for any assistance please contact spain@transatlanticlaw.com

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