Skip to content

ONS Open Data

ONS has a lot of data available publicly. This data is available in various formats and can be accessed through flat files or APIs. The full list of available data is available at dados.ons.org.br.

Another useful place to get data is the ANEEL open data portal. It is available at dadosabertos.aneel.gov.br and might have complementary data to the ONS data.

Constrained-Off

Currently one of the main uses we have for the ONS data is to get information about constrained-off events. These events are when the ONS has to limit the active power output of some power plants due to some constraint in the system. This can be due to a variety of reasons, such as transmission line limitations, generation limitations, or even operational reasons.

There are two main types of data available for constrained-off events:

  • Site level: Data considering a site in ONS definition, which will group multiple SPEs (Power Plants) in a single site. There we can find the limitation events and it's reasons. Data is available in different links for wind sites and solar sites.
  • SPE level: Data for each SPE (Power Plant). This will add the resource values (wind speed or irradiance) but will loose the limitations events. Data is available in different links for wind SPEs and solar SPEs.

For both types of data, there are flat files for each month. The data is available in .csv, .xlsx, and .parquet formats, although parquer is more recent, not being available for all months.

A couple classes have been defined to help with the import of this data. You can find more information about them in