ONS Brazil: EAR Daily Reservoir Stored Energy (Open Data)
Brazilian National Electric System Operator open data: daily Stored Energy (EAR, a proxy for reservoir fill level) per reservoir across the national hydropower system, in CSV/Excel and continuously updated since the 2000s.
dados.ons.org.br
At a glance
- Region
- Brazil (South America)
- Coverage
- Brazil
- Access
- Free
- Category
- Government
- Last updated
- 2026
What's inside
- reservoir storage
- hydropower
- time series
What you can do with it
Typical work that data of this type supports.
- 01
Storage tracking
Follow storage and releases through the season.
Because it has: reservoir storage
- 02
Change over time
See how lakes and wetlands have grown or shrunk.
- 03
Operations
Support release and supply decisions.
Where AI adds value
Ideas for machine learning and AI agents built on this kind of data.
- 01
Storage from space
Estimate volume from satellite water area and altimetry.
- 02
Release decisions
Optimise releases against inflow forecasts.
- 03
Shrinkage alerts
Detect water bodies that are drying or being encroached.
Machine access and documentation
Open API
CKAN data portal with dataset/resource API
Licence: Open data
Listed in our registry of open water APIs, which WaterDataGPT can query live.
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- UFRGS Large Scale Hydrology - South America Simulated River Discharge & Reservoir DatasetSouth America | Free
- Brazil ANA Flood MonitoringSouth America | Free
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