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Project Aguayo II, Pumped Storage Power Plant (1000 MW)

One of the largest Pumped and Storage Plant of Europe

REPSOL has awarded IDOM the PMC services (FEED stage) for the Spain Landmark Project Aguayo II PSP (1000 MW). Project is being developed by the Renewables branch of REPSOL (Spain’s largest Oil & Gas utility). It will be the largest Pumped and Storage Plant in operation in Spain and one of the largest of Europe.

REPSOL already operates in the same Site existing Aguayo I PSP (340 MW) with both powerhouse and waterways above ground. Aguayo II will share with Aguayo I already existing Upper reservoir (Mediajo reservoir) and Lower reservoir (Alsa dam) but it will be built as a brand new totally underground facility with two independent waterways (2×1780 m), a powerhouse cavern (126x29x50 m), a transformer cavern (120x17x17 m) and 4×250 MW pump-turbine motor-generator sets (Francis vertical, fixed speed).

Aguayo II PSP is the flagship project of REPSOL Renewables and Low Carbon generation strategy, and it is one of the most relevant within Spain’s Renewables deployment plan.

With this new contract, our our Energy area and its Hydropower Team reinforces its position as a global player in the Hydropower business, especially in the thriving Pumped and Storage Plants, which are paramount to ensure proper stabilization and control of the electrical Grids as a response to the challenging operation scenarios imposed by the full-scale deployment of green energies worldwide.


February 21, 2022

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Scope of works

- Conceptual engineering and Feasibility study (FEL 2)
- Design for Authorization
- Design for Tender
- Procurement technical support
- PMC services (FEED stage)
- Permitting support.