A year ago everything indicated that Asturias was going to become the new Spanish energy storage hub. But these plans, which were going to help integrate renewables, alleviate the grid and attract industry, collided with reality. Today, the panorama is very different. Not only has the region paralyzed new storage facilities, but an official report has just confirmed a more worrying diagnosis: Asturias is saturated with energy, but does not know where to put it. In short, the central area’s electrical grid is at its limit.
The CNMC uncovers the problem. The trigger It is an apparently technical conflict between EDP (Hidrocantábrico Distribución) and Red Eléctrica de España for access to the Carrió substation. As local media have reportedthe distributor requested to replace two transformers to increase its capacity from 513 MW to 665 MW, but REE rejected it, arguing that the network could not supply so much simultaneous demand.
This rejection took the case to the National Markets and Competition Commission (CNMC), which issued a resolution with a forceful message: the transport network in the central zone is saturated, it cannot grant new permits, there is “relevant overcapacity” and there is a “risk to the security of supply in the event of a simple failure, in the summer season.”
Furthermore, the commission itself recognizes that the case dates back to 2007, when the separation between distribution and transportation occurred and assets were transferred to REE without documenting the guaranteed access capacities. As the official report explains, for years REE and EDP operated “as always”, but with opposite interpretations about how much capacity was really assured for the Asturian network.
What does it mean to be saturated? Although it may seem like a technical concept, the CNMC has detailed in its report a more precise image of what is happening. To begin with, saturation means that the network cannot grant even one more access. The regulator detects a “total saturation of capacity, without the possibility of granting new access or connection permissions.” This means that no new industries, no renewable parks and no storage projects can connect: the grid is literally full.
Added to this blockage is another underlying problem. The central Asturias network does not meet the minimum legal criterion known as N-1, which requires guaranteeing supply even if a key component fails. However, the CNMC itself confirms that this requirement is not met: If a transformer or main line falls, there is no alternative path capable of absorbing the energy, making any incident a potential risk.
The situation is even more delicate according to the data. The regulator’s report indicates that two large electro-intensive consumers already absorb 686 MW, to which we must add the 200 MW that EDP needs to feed the distribution network. In total, more than 800 MW connected. The problem is that the safe capacity in summer – when the lines perform worse due to high temperatures – is 754 MW. In other words: there is more connected power than the network can safely support.
And the room for maneuver is practically non-existent. According to the CNMC, if Cardoso’s 400/220 kV transformer failed, the entire area would be supplied only by a 220 kV line that does not support current consumption in summer. In practical terms, this means that any simple failure could trigger a real supply problem in the middle of the summer season.
The point is that there is energy, but it cannot be moved. The paradox is evident: Asturias wants more renewables, it wants batteries, it wants to electrify its industry and it wants to attract new strategic projects. But all this growth requires a robust electrical grid with margin. And right now, that margin does not exist.
Carrió’s transformers could handle more power, yes, but that is unimportant if the lines that connect them are already at their limit. Even the future conversion to gas of the Aboño thermal power plant —designated by the Principality as future relief— does not solve the current problem, because the bottleneck is in transportation, not in generation.
How did we get here? In addition to the historical conflict between REE and EDP, a chain of factors have aggravated the situation. One of the most decisive is the increase in power assigned to some large industrial consumers. In 2022, Red Eléctrica granted an electro-intensive customer an increase of 132 MW, reaching 450 MW of power between Carrió and Tabiella. The regulator clarifies that this decision did not violate the regulations, but it does highlight the lack of coordination with EDP, which was not informed and saw how the capacity margin of the area was exhausted practically at once.
Added to this problem is another longer-term problem. As El Comercio remembersthe necessary reinforcements for the central network have been planned for more than 20 years, but were never executed. The result is that Asturias faces industrial electrification and the growth expected for the coming years with a network that has not been updated at the pace of demand.
The evolution of the local generation. The situation is complicated as cogeneration, a key technology for producing electricity and heat near industrial centers, has collapsed. According to figures published by El ComercioAsturias has lost 82% of cogeneration production in six years. This implies less energy generated at source and, therefore, more need to bring electricity from outside through a network that is already saturated. The economic and environmental impact is also notable: 60 million euros less industrial turnover and 230,000 additional tons of CO₂.
And now what? The Asturian Government insists that the problem will be resolved with the 400 kV central ringa gigantic infrastructure included in the energy planning for 2030. This ring will double the electric transportation capacity in the metropolitan area and will allow it to absorb the planned industrial growth.
For its part, Red Eléctrica you already have authorization for the new Cardoso substation, key to that ring, with an investment of 26.5 million euros. However, the CNMC warns that the problem is immediate, not five years from now. That is why it has opened an information file and has requested urgent measures from the Ministry and the Principality. The opposition, especially Asturias Forumcriticizes that the Government “looks the other way” while the network is “on the verge of collapse.”
A bottleneck. The point is that Asturias has energy, an industry that seeks to become electrified, renewable projects and companies willing to invest. However, it does not have enough network to move that energy. The big obstacle is not in the plants or the batteries: it is in the cables, transformers and lines that connect the entire system.
The region is trapped in an energy bottleneck that threatens its industrial development and security of supply. And although the solution is planned, its execution will make the difference between moving towards a modern energy model or being blocked due to a lack of capacity to continue growing.
Image | Unsplash
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