Flexible access to the electrical grid 2026: what data centers and energy-intensive industry must do

Key data

If your company needs to connect to the electrical grid in an area where firm capacity is not available, as of August 11, 2026, there is a regulated way to do it: flexible access. The Resolution of July 31, 2026 from the CNMC develops the specific mechanisms already provided for in Circular 1/2024, and defines four permit typologies that determine the conditions and restrictions under which a large consumer or storage facility can connect.

The regulation is especially relevant for data centers, energy-intensive industries, and energy storage projects that have been blocked for months—or years—due to saturation of nodes in the transmission or distribution network.

What does this regulation establish?

The resolution develops in detail the flexible access regime to the electrical grid, differentiating four permit typologies included in its annexes:

Flexible access is activated when a consumer cannot obtain firm access due to lack of capacity at the node they want to connect to. In that case, the regulation allows connection under flexibility conditions: the consumer accepts operational restrictions (for example, reduction or interruption of supply during congestion moments) in exchange for being able to connect.

Key points of the regime:

• Permit holders can modify the typology of permit they have, always respecting the order of precedence established.
• Storage facilities in demand mode are obligated to process flexible access, without exception, both in distribution and transmission.
• Expressly excluded from flexible access: essential supplies, urban development projects with mandatory electrification degrees and security supplies.

Economic and operational impact

The impact of this regulation is not a direct fee or fine: it is a condition of market access. For companies that need to connect to the grid in congested areas, flexible access moves from being an informal option to being the only legally recognized and regulated path.

The concrete operational consequences are:

• Without flexible permit, there is no legal connection at nodes without firm capacity. Projects paralyzed due to lack of firm access now have a way forward, but with conditions.
• Flexible access implies accepting possible interruptions or reductions in supply during moments of network congestion, which requires planning operations with contingency margins.
• Storage facilities in demand mode can no longer operate in a gray area: they must process the permit, which involves an administrative procedure with the CNMC or the corresponding network operator.
• Holders who already have a permit type can change typology, which opens an optimization window for those with less favorable permits.

For data center projects or industrial plants with large electrical demands, the availability of this framework can unlock investments that were blocked by the inability to obtain firm access within required timeframes.

Who does it affect?

• Data centers seeking grid connection in areas with saturated nodes.
• Energy-intensive industries (steel, chemicals, mining, aluminum manufacturing, etc.) with large power demands at congested network points.
• Energy storage facilities in demand mode (batteries, pumped storage, etc.), which are obligated to process flexible access both on transmission and distribution networks.
• Promoters and developers of industrial projects who have requested or are processing grid access without obtaining firm response due to lack of capacity.
• Distribution and transmission network operators, who must apply the new regime in their processing procedures.

Outside the scope of this regulation:

• Essential supplies (hospitals, emergency services, etc.).
• Urban development projects with mandatory electrification degrees under urban planning regulations.
• Security supplies.

Practical example

A large-scale data center developer requests connection to a transmission network node. The network operator informs them that there is no firm capacity available at that node. Before this resolution, the project would be blocked indefinitely or would need to seek an alternative node.

With the new framework, the developer can request a flexible access permit (for example, Type I according to Annex I of the resolution) that allows them to connect under flexibility conditions: they accept that during network congestion moments their consumption can be reduced or interrupted. In return, they obtain legal connection and can start operations.

If firm capacity becomes available at that node in the future, the holder can modify their flexible permit toward a more favorable typology, respecting the order of precedence established by the regulation. This possibility of changing typology is an active permit management tool that energy teams should monitor.

In the case of a storage facility in demand mode (for example, a battery system connected to the distribution network), processing flexible access is no longer optional: it is an obligation as of August 11, 2026.

What should companies do now?

1. Review the status of your grid access requests: If you have pending firm access requests or denials due to lack of capacity, analyze whether you can convert them into flexible access requests under one of the four regulated typologies.
2. Evaluate the operational impact of flexible access: Flexible access implies accepting possible interruptions. Before requesting it, calculate how much a supply interruption would cost you and whether your operation can tolerate it with contingency measures.
3. If you have storage facilities in demand mode, process the permit: The obligation is immediate as of August 11, 2026. Failing to process it means operating without regulatory coverage.
4. Review existing permits and their typology: If you already have a flexible access permit, check whether the current typology is the most appropriate for your operation and whether you can change it to a more favorable one respecting the order of precedence.
5. Coordinate with the corresponding network operator (Red Eléctrica de España for transmission, corresponding distributor for distribution) to learn about the specific processing procedures under the new framework.
6. Consult with a specialist advisor in electrical regulation to determine which permit typology (Annexes I to IV) best suits your project and what flexibility conditions are acceptable.

Official source

Consult complete regulation at official source

Notice: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-17571