v1
latestOpenAPI 3.0.0BSD License2026-07-24228233924.5 KBDemand and Surplus Forecast Data (2-14 days ahead) Transmission System
This end point provides the Transmission System forecast. Data is available from 9am on current day and will show values for the 2 to 14 days ahead. Expressed as an average MW value for each Settlement period. The Transmission System Demand Forecast is based on historically metered generation output for Great Britain. This value INCLUDES Interconnector flows and demand from station transformers and pumped storage units. Specific publish time filters may be supplied, otherwise this will retrieve the latest published forecast.
Query parameters
Start date time for the request, referring to when the forecast was published. Ex: yyyy-mm-ddThh:mm:ss
End date time for the request, referring to when the forecast was published. Ex: yyyy-mm-ddThh:mm:ss
Number of results to return per page.
The initial index from which to return the results.
The timezone for the query and returned data. If not specified, the default timezone is shown in the information table.
Response
Success