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 [email protected] 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?

Please note that the deadline for submitting a Season’s GC/DC values for the current season is listed on the Generation and Demand Capacity web page.
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When should I declare GC/DC values?

Initial Registration: When you register a BM Unit, you will register its GC and DC values for that Season as part of that process. Seasonal Declarations: You will need to declare your values for each subsequent Season before they start, with the deadline being ten Working Days before the Season begins. If you do not […]
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What is the Transfer of Supplier ID process

This process transfers a Supplier ID from one Supplier to another. Each Supplier ID will have 14 Base BM Units attached to it, and possibly some Additional BM Units. All of these are transferred across as part of this process. If a Party transfers their last Supplier ID, then they will also need to deregister […]
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What is the Change of BM Unit Lead Party

This process transfers a CVA BM Unit from one Party to another. All the other details with the BM Unit, such as parameters (e.g. GC/DC and CALF values), Metering Technical Details (MTDs), Aggregation Rules and Metering Dispensations, are transferred across to the new Party unchanged. However, any Metered Volume Reallocation Notifications (MVRNs) will be end-dated […]
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How do I transfer ownership of BM Units?

If you decide to change the ownership of a BM Unit, you will either follow the Change of BM Unit Lead Party (CoBLP) process for a Central Volume Allocation (CVA) BM Unit, or a Transfer of Supplier ID for Supplier Volume Allocation (SVA) BM Units. These generally require a 30 Working Day lead time, but […]
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How do I register BM Units?

The BM Unit Registration process is described in BSCP15 ‘BM Unit Registration’, which covers the procedures and timescales for registering BM Units. Registering a BM Unit requires a lead time of 30 Working Days, and you will normally need to speak to National Grid before this process begins, so you should leave plenty of time […]
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