Energy storage once again took center stage in the Official State Gazette (BOE) during August. After a July in which batteries appeared in 42% of renewable energy applications, the summer month confirmed that BESS systems are no longer considered an isolated complement, but rather a structural component of new energy developments.
The main indicator was administrative progress. During August, nine storage projects totaling 327.6 MW simultaneously received both the prior administrative authorization (AAP) and the construction administrative authorization (AAC) .
The figure includes eight hybrid installations with existing photovoltaic plants and the independent BESS Solórzano project in Cantabria. In the first group, the dominant pattern was the repetition of virtually identical modules around the same evacuation infrastructure.
Altarejos displays four twin blocks
The clearest example appeared in Altarejos, Cuenca. There, the Aitana, Aspe, Bañuela, and Turbón storage modules were developed, each with 21.69 MW associated with existing solar plants.
The four projects total 86.76 MW BESS and share the same architecture: battery modules of identical power, hybridized with photovoltaic parks of around 49 MW and connected to the infrastructure of the Altarejos complex.
The Administration had consolidated the processing of the four applications, although the authorizations were published through individual resolutions. The Official State Gazette (BOE) also indicates that each system has an energy capacity of 43.38 MWh and a duration of two hours. The Aitana resolution confirms that the joint concession from the AAP and the AAC was granted through a single act to expedite the procedure.
The scheme allows for the replication of engineering, equipment, and administrative documentation. Rather than four completely different developments, Altarejos functions as a platform made up of twin blocks that leverage existing solar plants and evacuation networks.
In Cuenca, the Covatillas 3 Hybridization project , promoted by Planta Solar OPDE 25, was added to this cluster. The project received AAP and AAC approvals to install 43.9 MW of batteries alongside an existing 48.118 MW photovoltaic plant in Castillejo de Iniesta. This authorization brings the total approved BESS capacity in the province for the month to 130.66 MW .
Seville replicates the model around its solar plants
The same modular approach was repeated in Seville. Between Los Molares, Alcalá de Guadaíra, and Utrera, four projects received authorization to incorporate 147.17 MW of batteries into existing photovoltaic plants.
Three of the modules have exactly the same power: BESS Afrodita, BESS GES and Don Rodrigo II each have 39.6 MW .
BESS Afrodita will be hybridized with a 46.2 MW solar plant in Los Molares. The resolution published on August 18 granted it both prior authorization and construction authorization.
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The following day, the Official State Gazette (BOE) published the preliminary report for BESS GES , also 39.6 MW and associated with a 46.2 MW photovoltaic plant in Alcalá de Guadaíra. The project file almost exactly replicates the configuration of Afrodita.
The third block, with a capacity of 39.6 MW, corresponds to Don Rodrigo II , in Utrera, which will be integrated with an existing 45.6 MW solar plant. This authorization completes a series of three identical modules that feed into the grid near the Don Rodrigo substation.
They were joined by Bianor , linked to Bruc, with another 28.37 MW along with a 33 MW photovoltaic plant in Utrera.
The result consolidates a storage corridor along the Alcalá de Guadaíra–Utrera axis. This concentration is not solely due to land availability: the projects leverage existing solar plants, access permits, and evacuation networks, reducing some of the risk associated with building entirely new facilities.
Solórzano obtains the necessary permits, but encounters difficulties with expropriation.
Bess Development 6 obtained the AAP and the AAC to build BESS Solórzano , an independent facility of 49.738 MW and 199.52 MWh located between Solórzano and Ruesga, in Cantabria.
The project will consist of 145 battery blocks and will connect to the Red Eléctrica 220 kV Solórzano substation. However, the Administration did not grant the requested declaration of public utility. The Official State Gazette (BOE) resolution explains that Article 54 of the Electricity Sector Law considers pumped hydro storage for expropriation purposes, but does not include other energy storage technologies.
The distinction has practical consequences. Solórzano has permission to build, but the DUP does not grant it the power to expropriate the necessary land and rights. The developer will have to secure control of the land and easements through private agreements.
The case thus serves as a test case for stand-alone storage. Batteries can pass environmental assessments and obtain energy permits, but they encounter an additional barrier when they need to resort to expropriation.
More than 320 MW and an increasingly defined pattern
The August figures show two different speeds. Hybrid systems are progressing through repeatable blocks, associated with already developed plants and nodes. Independent projects, on the other hand, must find other ways to address land availability when they cannot benefit from public utility permits.
Of the 327.6 MW BESS authorized during the month , 277.83 MW correspond to hybrid installations with photovoltaics and 49.74 MW to independent storage.
Altarejos contributes 86.76 MW through four identical modules; Cuenca adds another 43.9 MW with Covatillas 3; and Seville concentrates 147.17 MW around four solar plants. Solórzano completes the picture and, at the same time, reveals the outstanding regulatory issue.
August thus confirmed that energy storage is no longer progressing project by project. The new scale is being built through series: the same power outputs, replicable designs, and shared infrastructure. Batteries have ceased to be an accessory for renewable energy generation and have become one of the main drivers of reorganization and increased value in solar portfolios.