---
title: "Half-hourly generation outturn by fuel type"
method: GET
path: "/gb/elexon/system/fuelhh"
tags: ["Elexon"]
---

# Half-hourly generation outturn by fuel type

`GET /gb/elexon/system/fuelhh`

This endpoint provides the half-hourly generation outturn (Generation By Fuel type) to give our users an indication of the generation outturn for Great Britain. The data is aggregated by Fuel Type category and updated at 30-minute intervals with average MW values over 30 minutes for each category.

## Query parameters

- `publish_date_from` string, date-time, required
- `publish_date_to` string, date-time, required
- `limit` integer
- `offset` integer
- `timezone` 'UTC' | 'Europe/Berlin' | 'Europe/London' | 'America/New_York' | 'America/Chicago' | 'America/Los_Angeles'

## Response `200`

Success

- object
  - `count` integer, required
  - `next` string, uri, nullable
  - `previous` string, uri, nullable
  - `results` ElexonFUELHH[], required
    - `dataset` string
    - `publishTime` string, date-time
    - `startTime` string, date-time
    - `settlementDate` string, date
    - `settlementPeriod` integer
    - `fuelType` string
    - `generation` integer

## Other responses

- `400` — Bad Request
- `401` — Unauthorized
- `403` — Forbidden
- `404` — Not Found
- `429` — Too Many Requests

---

[API](https://skmtc.net/modoenergy/apis/modo-energy-api.md) · [All operations](https://skmtc.net/modoenergy/apis/modo-energy-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/modoenergy/modo-energy-api/revisions/6c4b83d3fc12/schema)