Storage Revenue Index
Storage Revenue Index: what storage earns in Spain
How much real storage assets earn in Spain, market by market.
Key figures
Pure pumped hydro
120nominal k€/MW·yr
Last 12 complete months (Jul 2025 – Jun 2026) for the 7 pure pumped hydro plants participating in ancillary services (3,198 MW of turbine capacity), across all markets.
Standalone batteries
130nominal k€/MW·yr
Last 12 complete months (Jul 2025 – Jun 2026) for the 3 standalone batteries in a regulation zone (10.6 MW of discharge capacity), across all markets.
Monthly revenues
Storage fleet-wide revenues by month
By asset
Every asset and market agent, one scale
Hourly operation
The fleet, hour by hour
Methodology
How it is calculated
Methodology · aFRR backcast
Despite not having full visibility over aFRR participation, estimating proportionally to regulation zone reservations provides a fair representation
Methodology
From regulation zone capacity to an individual asset
Hour by hour
Granular backcast: hourly fleet-wide award against capacity distributed from the regulation zone
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Methodology · fleets
What each fleet includes
Sources
REE · ESIOS (I90, liquicomun, programming units) and OMIE (day-ahead, intraday auctions, continuous).
Data
From 1 Jan 2023 to 8 Jul 2026
Recalculated monthly
Asset-level operation is available in Energy Tracker™.
Notice
An estimate produced by Optimize Energy from published market data. It is not each participant’s settlement, and it is information, not investment, financial or trading advice.
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