---
title: "Peak demand per day (ITSDO)"
method: GET
path: "/demand/peak"
tags: ["Demand"]
---

# Peak demand per day (ITSDO)

`GET /demand/peak`

This endpoint allows for retrieving peak ITSDO demand for each day from National Grid ESO.
Results are filtered by a range of Date parameters.
Results default to yesterday's peak if no parameters are supplied.
            
Date parameters must be provided in the exact format yyyy-MM-dd.

## Query parameters

- `from` string, date
- `to` string, date
- `format` 'json' | 'xml' | 'csv'

## Response `200`

Data retrieved

- InsightsApiModelsResponsesResponseWithMetadata1InsightsApiModelsResponsesDemandOutturnDemandOutturnPeak
  - `data` InsightsApiModelsResponsesDemandOutturnDemandOutturnPeak[], nullable
    - `publishTime` string, date-time, nullable
    - `startTime` string, date-time
    - `settlementDate` string, date
    - `settlementPeriod` integer
    - `initialTransmissionSystemDemandOutturn` integer
  - `metadata` InsightsApiModelsMetadataApiResponseSourceMetadata
    - `datasets` string[], nullable

## Other responses

- `400` — Error with query parameters - see response for details
- `429` — Too many requests
- `500` — Server error - please try again later

---

[API](https://skmtc.net/elexon/apis/bmrs-insights.md) · [All operations](https://skmtc.net/elexon/apis/bmrs-insights/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/elexon/bmrs-insights/versions/d94e9edb295e/schema)