BM Units

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Where can I get more information on BM Units?

You can read more about BM Units on the Balancing Mechanism Units page of the ELEXON website, and in the BM Units Guidance. See Section K of the BSC for information on the Classification and Registration of BM Units and Metering Systems. BSCP15 outlines the processes for Registering, De-registering and transferring ownership of CVA and […]

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What happens if I breach my GC/DC values?

During each Season, we run checks on all BM Units to see if they have breached their GC or DC values. For any BM Units that have, we send the Party an email asking them to re-declare their values accordingly. Any Party that breaches should re-declare their values as soon as possible, otherwise they risk […]

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What could be the impact of re-declaring GC/DC?

If you re-declare GC or DC then this may result in a change of the BM Unit’s P/C Flag. If the BM Unit is a part of a Trading Unit, then the Flag of all the BM Units in the Trading Unit may be affected. This would affect which Energy Account the BM Unit’s Metered […]

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How do I declare GC/DC values?

Seasonal declarations are done using form BSCP15/4.3, and mid-Season re-declarations are done using form BSCP15/4.4.  These forms can be found here. Download the appropriate form in Word format to populate. The completed forms should be sent to the Central Registration Agent (CRA) either by email to or by fax to 0870 833 5601. You need to be […]

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When is the deadline for submitting the next Season’s GC/DC values?

The deadline for submitting a Season’s GC/DC values is ten Working Days before the start of the season. If you miss the deadline, your current values will be carried over. However, you can still change your values with a mid-Season re-submission, but you will only be able to increase the values in magnitude, except for […]

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