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Spain has authorized construction of the Los Guájares pumped-storage hydroelectric plant in Granada, but the authorization does not mean construction has begun or that the facility is operating. The BOE resolution, dated 16 September 2026 and published on 28 October, grants the project developer prior administrative authorization and authorization to construct the plant and its grid-evacuation infrastructure.
The authorized design specifies 356.93 MW of turbine capacity, 363.99 MW of pumping capacity and 1.47 GWh of stored energy. Those figures describe different things: MW is power, while GWh is energy. The project is designed for up to six hours of continuous turbine operation at its specified conditions.
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What has Spain approved?
The authorization is for Hidroeléctrica Los Guájares, SLU to construct the reversible hydroelectric plant and its associated power-evacuation infrastructure. The BOE authorization is dated 16 September 2026 and was published on 28 October. MITECO announced the decision on 28 October in its project announcement.
This is a construction authorization, not confirmation that work is underway, finished or generating electricity. The BOE requires compliance with the project’s environmental conditions and other applicable permits. The official materials cited here do not give a confirmed construction start, completion date or commercial operation date.
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How will the Los Guájares pumped-storage plant work?
Pumped storage stores electricity by moving water uphill and releases that water later through turbines to generate electricity. Los Guájares will use the existing Rules reservoir as its lower reservoir and a newly built upper basin on the hillside.
When electricity is available for storage, the plant will use pumps to move water from the lower reservoir to the upper basin. When power is needed, water will flow back downhill through pressure conduits and drive reversible turbines. The authorized design places two vertical-axis Francis turbine units in an underground cavern. The plant’s maximum gross head—the vertical difference used in the hydraulic design—is 638 metres.
What do the plant’s capacity figures mean?
The approved figures distinguish generating power, pumping demand and stored energy. The plant is designed to generate at roughly 357 MW, but that power rating is not the amount of energy it stores.
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| Measure | Authorized figure | What it means |
|---|---|---|
| Turbine capacity | 356.93 MW | Maximum specified generating power |
| Pumping capacity | 363.99 MW | Specified power demand while pumping water uphill |
| Stored energy | 1.47 GWh | Energy storage capacity |
| Maximum continuous turbine operation | 6 hours | Specified maximum period of continuous generation |
| Total turbine flow | 66.24 m³/s | Specified combined flow through the turbines |
| Total pumping flow | 50.30 m³/s | Specified combined flow while pumping |
In practical terms, the design pairs nearly 357 MW of generating power with 1.47 GWh of storage and specifies up to six continuous hours of turbine operation. Actual output and duration depend on operating conditions; the figures should not be read as a promise of constant generation in all circumstances. MITECO describes the facility as having 1.47 GWh of storage in its announcement, while the detailed operating specifications appear in the BOE resolution.
Where will the plant and grid connection be?
The final authorization names Vélez de Benaudalla, El Pinar and Los Guájares, in Granada. The upper basin is planned with a capacity of 1.4 hm³, and the existing Rules reservoir serves as the lower basin.
To connect the plant to the grid, the authorized 220 kV evacuation line will run from the plant’s substation to the Mizán substation. Its authorized route is 6,662 metres long and includes 25 supports. MITECO describes the line as passing through Vélez de Benaudalla, El Pinar and Los Guájares.
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The earlier environmental assessment describes a project footprint that also names Padul. That assessment-area reference is distinct from the municipalities named in the final 2026 authorization for the plant and line. The 2025 environmental impact statement was issued on 12 August 2025 and published on 23 August 2025.
What environmental and permitting conditions remain?
The 2025 environmental impact statement set out the assessment scope, consultation process and environmental conditions. It also makes clear that the environmental assessment does not replace other approvals required by law. The 2026 construction authorization incorporates compliance with the environmental conditions, alongside other applicable permits.
Accordingly, the authorization establishes permission to construct under stated conditions; it does not establish that every subsequent requirement has been completed or that site work has started. Project status should be described as authorized, rather than under construction or operational, unless a later official update confirms a change.
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How much public support has the project received?
MITECO says the Institute for the Diversification and Saving of Energy (IDAE) granted the project €23 million under the second call for innovative pumped-storage energy projects in Spain’s Recovery, Transformation and Resilience Plan. This is the amount and program reported by MITECO; it should not be treated as the total project cost.
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MITECO also cites Spain’s National Integrated Energy and Climate Plan target of 22.5 GW of installed storage capacity by 2030. That is a planned target, not a statement of storage capacity already installed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When will the Los Guájares plant be operational?
No confirmed construction start, completion or commercial operation date is provided in the official materials cited here. The authorization itself is not a schedule, and an administrative deadline should not be treated as a forecast opening date.
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For a useful status check, look for a subsequent official announcement or BOE notice that confirms construction progress or an operating date. Until then, the accurate description is that Spain has authorized construction of the project.
Frequently Asked Questions
What is the difference between pumped storage and a conventional hydroelectric plant?
Pumped storage is designed to cycle water between reservoirs: it consumes electricity to pump water uphill and later generates electricity as the water returns downhill. The cited project documents describe this two-reservoir arrangement for Los Guájares; they do not provide a comparison with any particular conventional plant.
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Does the €23 million grant mean the plant will cost €23 million to build?
No. MITECO reports a €23 million IDAE grant under a national support program, not a total construction budget. The official materials cited here do not state the project’s overall cost.
Why does the environmental assessment mention Padul if the final authorization lists three municipalities?
The environmental statement’s project description names Vélez de Benaudalla, El Pinar, Los Guájares and Padul, while the 2026 authorization names the first three for the authorized plant and line. These references serve different purposes: one describes the assessment footprint and the other the municipalities specified in the final authorization.
