---
title: "Historic view of the earliest forecasted demand (NDF, TSDF)"
method: GET
path: "/forecast/demand/day-ahead/earliest"
tags: ["Demand Forecast"]
---

# Historic view of the earliest forecasted demand (NDF, TSDF)

`GET /forecast/demand/day-ahead/earliest`

This endpoint allows for retrieving earliest day-ahead demand forecast data from National Grid ESO.
Results are filtered by settlement time, and only the earliest published forecast for each settlement period is shown.

## Query parameters

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

## Response `200`

Data retrieved

- InsightsApiModelsResponsesResponseWithMetadata1InsightsApiModelsResponsesDemandForecastDemandForecastDayAhead
  - `data` InsightsApiModelsResponsesDemandForecastDemandForecastDayAhead[], nullable
    - `publishTime` string, date-time, nullable
    - `transmissionSystemDemand` integer
    - `nationalDemand` integer, nullable
    - `startTime` string, date-time
    - `settlementDate` string, date
    - `settlementPeriod` integer
    - `boundary` string, nullable
  - `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)