---
title: "Evolution of the one-year demand forecast over time  (NDFW, TSDFW)"
method: GET
path: "/forecast/demand/weekly/evolution"
tags: ["Demand Forecast"]
---

# Evolution of the one-year demand forecast over time  (NDFW, TSDFW)

`GET /forecast/demand/weekly/evolution`

This endpoint provides all weekly demand forecasts over time for a given forecast Year and Week

## Query parameters

- `forecastYear` integer, required
- `forecastWeek` integer, required
- `format` 'json' | 'xml' | 'csv'

## Response `200`

Data retrieved

- InsightsApiModelsResponsesResponseWithMetadata1InsightsApiModelsResponsesDemandForecastDemandForecastWeekly
  - `data` InsightsApiModelsResponsesDemandForecastDemandForecastWeekly[], nullable
    - `publishTime` string, date-time, nullable
    - `transmissionSystemDemand` integer
    - `nationalDemand` integer, nullable
    - `forecastWeek` integer
    - `forecastYear` integer
    - `weekStartDate` string, date
  - `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)