---
title: "Frequency"
method: GET
path: "/frequency"
tags: ["power"]
---

# Frequency

`GET /frequency`

## Request

- Base URL: `https://api.energy-charts.info` (the document declares no server; this is the origin it was published from)
- URL: `https://api.energy-charts.info/frequency`
- Auth: none declared
- TypeScript: <https://skmtc.dev/energy-charts/apis/energy-charts-api/docs/frequency/get.ts> (a function with typed inputs; its response is checked against the schema)

Returns the frequency measured at Fraunhofer ISE in Freiburg, Germany. Currently only the frequency in RG Continental Europe (formerly UCTE) is available. The data is available in 1 second timesteps from 1st of May 2022 onwards.
    


    

Response schema:
    

 ```json
{
  "unix_seconds": list[int],
  "data": list[float],
  "deprecated": bool
}
```

## Query parameters

- `region` string
- `start` string
- `end` string

## Response `200`

Successful Response

- FrequencyModel
  - `unix_seconds` integer[], nullable
  - `data` number[], required
  - `deprecated` boolean, required

## Other responses

- `422`: Validation Error

## Changes

- **2026-07-13** `229b4ee41576`: 1 breaking
  - for the `query` request parameter `region`, default value was changed from `UCTE` to `DE-Freiburg`
- **2025-05-06** `63bae0186e06`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/energy-charts/apis/energy-charts-api/changes/frequency/get.md)

---

[API](https://skmtc.dev/energy-charts/apis/energy-charts-api.md) - [All operations](https://skmtc.dev/energy-charts/apis/energy-charts-api/llms.txt) - [OpenAPI document](https://skmtc.dev/energy-charts/apis/energy-charts-api/revisions/523d3ec0fd82?raw)