---
title: "Initial Transmission System Outturn data"
method: GET
path: "/gb/elexon/system/itsdo"
tags: ["Elexon"]
---

# Initial Transmission System Outturn data

`GET /gb/elexon/system/itsdo`

## Request

- Base URL: `https://api.modoenergy.com/pub/v1`
- URL: `https://api.modoenergy.com/pub/v1/gb/elexon/system/itsdo`
- Auth: one of:
  - API key in header `X-Token`
  - none

The endpoint provides data showing the Transmission System Initial Demand outturn.

## 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` ElexonITSDO[], required
    - `dataset` string
    - `publishTime` string, date-time
    - `startTime` string, date-time
    - `settlementDate` string, date
    - `settlementPeriod` integer
    - `demand` integer

## Other responses

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

---

[API](https://skmtc.dev/modoenergy/apis/modo-energy-api.md) - [All operations](https://skmtc.dev/modoenergy/apis/modo-energy-api/llms.txt) - [OpenAPI document](https://skmtc.dev/modoenergy/apis/modo-energy-api/revisions/7d9d1bd6ee06?raw)