Known Limitations

API limitations

The Public Data API enforces certain limits to maintain performance, ensure stability, and prevent misuse.

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API rate limiting

• The API allows up to 30 requests per minute (approximately 1 request every 2 seconds). If you exceed this limit, the API will return a 429 Too Many Requests error with the following response:

  {
      "error_key": "throttled",
      "error_message": "Too Many Requests"
  }
  

• Downloads of historic files via the API and WebUI are limited to 1,000 files at a time.

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Geographic rate limiting

For security reasons, certain regions may be blocked from accessing *.ercot.com sites. Currently, regions outside the United States of America are restricted.

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Available Data Date Range

API data downloads are available beginning from the product's initial active date in the system, which is 12/11/2023 for most products or later for newly added ones. For detailed dates by product, see the Release Notes.

Data before the initial active date is accessible exclusively as historic file downloads and is retained for at least 7 years.

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