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latestOpenAPI 3.0.0BSD License2026-07-24228233924.5 KB
Elexon

Demand and Surplus Forecast Data (2-52 weeks ahead) Transmission System Demand

This endpoint provides the Transmission System Demand forecast received from NGESO. Data is available from 4pm each Thursday and will show values for the 2 to 52 weeks ahead. Expressed as an average MW value for each week. The forecast is based on historically metered generation output for Great Britain. This value INCLUDES transmission losses, but EXCLUDES Interconnector flows and demand from station. This API will provide a maximum data output range of 366 days.

get/gb/elexon/forecasts/tsdfw

Query parameters

publish_date_fromstring date-time required

Start date time for the request, referring to when the forecast was published. Ex: yyyy-mm-ddThh:mm:ss

publish_date_tostring date-time required

End date time for the request, referring to when the forecast was published. Ex: yyyy-mm-ddThh:mm:ss

limitinteger

Number of results to return per page.

offsetinteger

The initial index from which to return the results.

timezone'UTC' | 'Europe/Berlin' | 'Europe/London' | 'America/New_York' | 'America/Chicago' | 'America/Los_Angeles'

The timezone for the query and returned data. If not specified, the default timezone is shown in the information table.

Response

Success

countinteger required
nextstring uri nullable
previousstring uri nullable