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Generating Plant Demand Margin
Please note that
BM Unit registration data moved to the
ELEXON Portal on 1 September 2010. Information and guidance about BM Units
will remain on ELEXON.co.uk. This data will temporarily remain here until the new
site goes live later this month at which point you will only be able to access it
by logging into the Portal.
Click here to register for the Portal now. Please contact
communications@elexon.co.uk if you have any questions.
You can download files that contain Generating Plant Demand Margin data on this page.
Each BM Unit will have provided Output Usable data which provides a forecast of how much generation capacity will be available. This is compared against the forecasted National Demand, and the difference between them is the "Generating Plant Demand Margin". Formal definitions of these terms can be found in the Glossary and Definitions section of the Grid Code.
To view Generating Plant Demand Margin data please select a file type by using the drop down menu below.
The following types of Generating Plant Demand Margin information are available.
- 2-14 Days ahead: The daily peak half hour MW value of Generating Plant Demand Margin for each day from the 2nd to the 14th day following the current Operational Day. The six previous files will be available for download.
- 2-52 Weeks ahead: The weekly peak half hour MW value for the peak Settlement Period for each week from the 2nd to the 52nd week following the current week. The three previous files will be available for download.
You can request any historical Generating Plant Demand Margin data since 30 September 2002 that is no longer displayed here by contacting the BSC Service Desk on 0870 010 6950, or emailing bscservicedesk@logica.com. You should also contact the Service Desk if you have any difficulty in viewing the data displayed here.
"Surplus" data, previously labelled "National Margin based on OC2", can be found on the Balancing Mechanism Reporting System (BMRS) website.
Please note that from 18 July 2003 the numbers included in the calculation of this data assume a zero MW transfer across the Interconnectors. For example, on the French Interconnector, the actual transfer could be anything between 2,000MW import to Great Britain and 2,000MW export from Great Britain. Prior to this date a 2,000MW import to Great Britain had been assumed.