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
Plant by plant
One week, asset by asset
The asset map, each asset’s characteristics and its hourly operation have their own page.
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 28 Jul 2026
Updated daily: the I3 every day, the I90 as REE publishes it
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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