Section S – Supplier Volume Allocation
and its associated Annexes set out the rules by which Primary Supplier BM Unit Metered Volume
s are determined from a combination of Half Hourly (HH) and Non Half Hourly (NHH) Metering System
s. It describes the obligations on Supplier
s to provide data and to ensure that Supplier Agent
s (i.e. certain Party Agent
s - principally Meter Operator Agent
s (MOAs), Half Hourly Data Collector
s (HHDCs), Half Hourly Data Aggregator
s (HHDAs), Non Half Hourly Data Collector
s (NHHDCs) and Non Half Hourly Data Aggregator
s (NHHDAs)) undertake the requirements defined for them.
Section S also sets out the rules and provisions by which Suppliers, Virtual Lead Parties (VLPs) and Asset Metering Virtual Lead Parties (AMVLP), shall notify to the Supplier Volume Allocation Agent (SVAA) which Metering Systems should be treated as belonging to a Secondary BM Unit, with regards to VLPs and AMVLP’s, or a Primary Additional BM Unit, with regards to Suppliers, for the purposes of providing TERRE or BM Balancing Services.
Section S: Annex S-2
defines the detailed Supplier Volume Allocation
(SVA) Rules for determining Primary Supplier BM Unit Metered Volume
s, and Section S: Annex 1
defines Performance Level
s with which Supplier
s and their Supplier Agent
s must comply, together with a Menu of Supplier Charges
(also known as Liquidated Damages within the Code Subsidiary Document
s) in the event that they do not.
A Supplier ID is a reference by which a Supplier is uniquely identified, for SVA purposes, in the Central Switching Service (CSS) under the Retail Energy Code (REC) and the relevant Supplier Meter Registration Service (SMRS) under the BSC. A Supplier may hold no more than three Supplier IDs unless the additional Supplier IDs are held pursuant to a transfer or a request for additional Supplier IDs is granted by the Panel. The responsibilities of Suppliers and Supplier Agents, Primary Supplier BM Units, Supplier Volume Allocation rules apply separately to each Supplier ID.
Supplier IDs can be transferred between Suppliers. The Supplier transferring the Supplier Id must give notice in writing to Elexon. The notification includes information concerning the transfer and must be signed by both Suppliers. Requests received before 12:00 can take effect (at the earliest) from the following day (effective at midnight, start of day), whilst requests received after 12:00 can take effect (at the earliest) from the day after the following day. Elexon sends a copy of this notice to the Authority, each Party and the Central Registration Agent (CRA).
From the time and date the ID transfer is to take place the ID Transferee becomes responsible (and the ID Transferor ceases to be responsible) for all Imports and Exports for the relevant Primary BM Units, the registration of all relevant Metering Systems, Plant and Apparatus, the associated Supplier Agent appointments and the Trading Charges and BSCCo Charges. The ID Transfer’s obligations and liabilities in respect of dates before the transfer date (e.g. from Reconciliation Runs) remain unchanged. The ID transferral shall not affect Energy Contract Volume Notifications (ECVNs), Metered Volume Reallocation Notifications (MVRNs) or the contractual arrangements between the Transferor/Transferee and their Party Agents.
Following the transfer of Supplier ID, the CRA shall establish a Transferee Primary BM Unit for each Relevant Primary BM Unit with the same attributes (e.g. Demand Capacity/Generation Capacity and Production/Consumption Status). This will be as if it was registered by the ID Transferee on the ID Transfer Date and the corresponding Primary BM Unit cancelled by the ID Transferor on that date. The Primary BM Unit Metered Volumes shall be transferred between the Primary BM Units as long as they were submitted before the ID Transfer Date. Data and rights relating to the Relevant Primary BM Units automatically are reassigned from the ID Transfer Date provided this is legally possible.
The ID Transferee shall have a right to access records, information and data as required and the ID Transferor shall take all reasonable steps to cooperate. With regards to transfer of Plant or Apparatus, which are subject to Shared SVA Meter Arrangement, the ID Transferee shall be bound by the Allocation Schedule and status prior to the transfer.
Responsibilities of Suppliers and Supplier Agents
must appoint Supplier Agent
s in accordance with Section J
and, for SVA MOAs, the REC. The Supplier
will be responsible for all actions taken or not taken by the Supplier Agent
s it appoints, in relation to Metering System
s for which that agent is appointed. Each Supplier
must record the Supplier Agent
s appointed to each SVA Metering System
in the relevant SMRS
For NHH Systems that are compliant with the Smart Metering Equipment Technical Specifications (SMETS), the Supplier shall establish and maintain and provide Meter Technical Details (MTDs) to enable the NHHDC to process data in accordance with SVA Rules. On registering a Smart compliant meter, the Supplier shall provide the meter configuration details to the MOA, who will then provide additional asset specific details and forward the full MTDs to the NHHDC.
HHDCs are responsible principally for collecting and validating Metered Data and providing SVA Metering System data to the relevant Data Aggregators. NHHDCs are additionally responsible for calculating and providing Annualised Advance (AA) and Estimated Annual Consumption (EAC) data using Daily Profile Coefficients provided by the SVAA. When a Supplier appoints a Data Collector for a Metering System for which it is responsible, it must send the Data Collector information concerning the Metering System, which is registered in the relevant SMRS. The Supplier should also send any Customer-own reads to the Data Collector, except where the Supplier has good reason to believe that it is invalid.
HHDAs are responsible for calculating and providing to the SVAA SVA Metering System
data, for each Supplier
that appointed it, aggregated by GSP Group
and Consumption Component Class
, and also any Additional BM Unit
data and for receiving Line Loss Factor
s from the BSC Website
and applying them. Where applicable, HHDAs must provide metered data to an EMR Settlement Services Provider
NHHDAs are responsible for providing to the SVAA, for each Supplier that appointed it, AA and EAC data aggregated by GSP Group, Profile Class, Standard Settlement Configuration and Line Loss Factor Class. For all Metering System for which they are responsible, Suppliers must send the relevant Data Aggregator information held in the relevant SMRS concerning the Metering System. HHDAs and NHHDAs are also responsible for maintaining standing data.
NHHDAs may be required to provide the relevant Licensed Distribution System Operator
) with EAC data and Metering System
details in accordance with Section S: Annex S-2
Meter Administrators, also appointed by Suppliers, are responsible for calculating deemed metered volumes for HH Unmetered Supplies and providing that data to the relevant HHDC.
When a Supplier registers a new Metering System in CSS it must allocate the Metering System to a Profile Class and Standard Settlement Configuration in SMRS, in accordance with BSCP501. For existing Metering Systems it must ensure that the Metering System continues to be allocated to the correct Profile Class. Suppliers are required to co-operate with the Profile Administrator in the provision of customers to contribute to the load research sample.
With respect to SVA and SMETS compliant NHH Metering Systems, Suppliers are obliged to hold the MTDs and, in the case of NHH Metering Systems, the valid Metered Data obtained during the preceding 40 months for each relevant Settlement Register. In addition, the Supplier shall hold the latest values of the EAC and the AA.
A Supplier who treats a NHH Metering System as Long Term Vacant must keep auditable records of its compliance and provide the Metering System details to the LDSO as requested.
Provision of Data to a CM Settlement Services Provider
Suppliers shall ensure that, if requested to do so by a Customer or generator with Capacity Market (CM) assets subject to Capacity Agreement, its HHDA provides metered data relating to that SVA Metering System to the CM Settlement Services Provider.
The performance of Supplier
s and Supplier Agent
s in respect of the requirements of Section S
affects the allocation of volumes for all Supplier
s. Accordingly Supplier
s are obliged to ensure that they and their Supplier Agent
s meet certain Performance Level
s. The Supplier
is required to provide information to the Performance Assurance Board
(PAB) to demonstrate that it and each of its Supplier Agent
s are discharging their responsibilities to the Performance Level
s, as defined in Section S: Annex S-1
In the event of any failure to comply with the Performance Level
s, Section S: Annex S-1
also sets out a Menu of Supplier Charges
for which the Supplier
is liable. A number of events of Supplier Force Majeure
are defined, which exempt the Supplier
from the liability to pay charges.
Functions of BSC Agents in relation to Supplier Volume Allocation
must (in accordance with the relevant provisions of the BSC and Code Subsidiary Document
s (including BSCP508
)) provide a supplier volume allocation service in accordance with the SVA Rules contained in Section S: Annex S-2
, provide a daily profile production service and provide a Market Domain Data
(MDD) service to the electricity
market. MDD comprises information required by Supplier
s and Supplier Agent
s, and includes information necessary for the SVA Rules, such as details of GSP Group
s, Profile Class
es, Standard Settlement Class
Configurations and Time Pattern Regime
The SVAA should provide data to the NETSO and Distribution System Operators for the purposes of calculating transmission and distribution use of system charges respectively, and to the SAA for the provision of Relevant EMR Settlement Data to an EMR Settlement Services Provider. Additionally the SVAA must perform related services if requested by the Panel, including the provision of a contingency plan and disaster recovery service, and the provision of a helpdesk service.
The Profile Administrator
creates and maintains a load research sample, provides Regression Coefficients
and Group Average Annual Consumption
s for a number of Profile Class
es to Parties, the SVAA
, Supplier Agent
s and to Elexon. In the event that Elexon provides the Profile Administration Services
usually provided by the Profile Administrator
, as provided for in Section C
of the Code
, references to the Profile Administrator
should be construed as references to Elexon.
The Teleswitch Agent monitors radio messages sent to teleswitched SVA Metering Systems and provides data on switching times to the SVAA. The Teleswitch Agent must also report to the SVAA any known or suspected failures in the monitoring and provision of messages.
Functions of Other Agents in relation to Supplier Volume Allocation
, in its capacity as a Supplier Meter Registration Agent
), is responsible for establishing, operating and maintaining (either directly or by procuring) a Supplier Meter Registration Service
) for SVA Metering System
s and associated data, in accordance with the REC, Section K
, (including Annex K-1) the Supplier Volume Allocation Rules
Each SMRA shall ensure that the data it is responsible for is accurate and complete, and that its SMRS enables only one Supplier to be registered as responsible for Imports at a Metering System for a particular Settlement Day.
Primary Supplier BM Units
HHDAs must be Qualified, as covered in Section J
. HHDAs may be Qualified to aggregate data from Metering System
s provided by HHDCs to provide metered consumption values (known as BM Unit
) for one or more Primary Supplier BM Unit
s (i.e. a Primary Base BM Unit
and Primary Additional BM Unit
s) in each GSP Group
. However, HHDAs can be Qualified to provide only metered consumption values (known as Supplier
) for only one Primary Supplier BM Unit
totalled for the Supplier
(i.e. a Primary Base BM Unit
only) in each GSP Group
This provides compatibility for systems of HHDAs that complied with the Pooling & Settlement Agreement but which do not have the functionality to allocate consumption into Primary Additional BM Units as well as Primary Base BM Units.
Where a Supplier
registers a Primary Additional BM Unit
(in accordance with Section K
), the Primary Additional BM Unit
may comprise one or more HH Metering System
s and/or one or more sets of NHH Metering System
s in the same GSP Group
, each set comprising all the NHH Metering System
s registered to that Supplier
having the same Profile Class
and Standard Settlement Configuration
. The Supplier
must inform the relevant HHDAs and NHHDAs accordingly.
Supplier Volume Allocation Rules
All clauses in Section S: Annex S-2
are treated as being part of Section S
and have effect, even if not specifically referenced by Section S
or any other section of the BSC. Supplier
s and Supplier Agent
s are required to provide data to the SVAA
in accordance with the SVA Rules and BSCP508
. The SVA Rules set out in Section S: Annex S-2
(a) the provision of SVA Metering System information from the relevant SMRS to Suppliers and Supplier Agents;
(b) provision of standing data to the SVAA by Suppliers, Supplier Agents, LDSOs and others;
(c) provision of periodic data to the SVAA by Data Aggregators, the Temperature Provider and the Teleswitch Agent;
(d) the calculations performed by Data Collectors and Data Aggregators on behalf of Suppliers;
(e) the principal functions of the SVAA, including deriving profile data, distributing Daily Profile Coefficients to NHHDCs; determining uncorrected import and export volumes; applying GSP Group Correction Factors; and determining the half hourly energy volumes for each Supplier BM Unit and providing these to the Settlement Administration Agent (SAA).
SVA Metering System Balancing Services Register
Where a Supplier, VLP or AMVLP has registered one or more BM Units (in accordance with Section K) and intends to offer Balancing Services, the Lead Party of that BM Unit is obligated to notify the SVAA of the Metering Systems they intend to use in their BM Unit(s) via MSID Pair allocations.
An ‘MSID Pair’ means one Import Metering System and, where applicable, one Export Metering System situated at a single Boundary Point for the purposes of the providing Replacement Reserve (RR) or Balancing Mechanism (BM) services. To clarify a MSID Pair must contain a HH Import Metering System but does not always have to have to contain a HH Export Metering System.
Similarly an AMVLP will register it’s “behind the boundary point” metering asset(s) with the SVAA, which will in turn generate “AMSID Pairs” for valid assets. These AMSID Pairs can then be registered against Secondary BM Unit(s) for either Asset Metering or Asset Differencing. Note that a second AMVLP may allocate the same AMSID Pair to a Secondary BM Unit.
For the avoidance of doubt a HH Metering System within a MSID Pair may not be allocated to more than one MSID Pair and a MSID Pair may not be allocated to more than one BM Unit that offers Balancing Services for any given time.
Once MSID Pair Allocation is received, the SVAA shall validate and notify the Lead Party whether the allocation was successful or not. Where it confirms the relevant allocation (in accordance with Section S), the SVAA shall record the relevant data in the SVA Metering System Balancing Services Register. If the HH Metering System is already allocated to another BM Unit that offers Balancing Services, the SVAA will confirm the most recent allocation and notify the previous SVA Metering System Balancing Service Register registrant of the loss of MSID Pair Allocation.
In respect of a Primary BM Unit, upon being informed that a HH Metering System will no longer be allocated to that Primary BM Unit for the purposes of providing Balancing Services in Settlement, it is the responsibility of the Supplier of that Primary BM Unit to ensure that such HH Metering System is not subsequently used for any inappropriate Balancing Services activity.
Where the SVAA confirms a VLP MSID Pair or a AMVLP Pair, allocation for a Secondary BM Unit it shall:
(a) procure MSID Standing Data in accordance with Annex S-2; and
(b) store MSID Standing Data in the SVA Metering System Balancing Services Register.
MSID Standing Data means in relation to each Metering System:
(a) the GSP Group in which the Metering System is located;
(b) the Supplier ID of the Supplier that has registered the Metering System in CSS (in accordance with Section K); and
(c) the HHDA appointed in relation to that Metering System.
must be Qualified, as covered in Section J
. Each LDSO
must determine whether any supply of electricity
connected to its Distribution System
(s) or its Associated Distribution System
(s) that does not have a SVA Metering System
is to be treated as an Unmetered Supply
. It will not determine that a supply could be treated as unmetered unless installing metering is either infeasible or would cost an amount disproportionate to the supply.
If the LDSO decides that a supply should be unmetered, it decides whether that supply should be either:
(a) Profiled Unmetered, in which case the supply is assigned an EAC which, in combination with the appropriate profile, is used to determine the estimated consumption of that supply; or
(b) use Equivalent Meter
ing, where half-hourly consumption values are calculated by using a technique that complies with BSCP520
that governs such calculations.
If a supply is to be treated as unmetered, the LDSO will issue the customer with an Unmetered Supply Certificate which will state whether the Unmetered Supply to which it relates is an Equivalent Unmetered Supply or a Profiled Unmetered Supply.
An LDSO when carrying out the above functions relating to Unmetered Supply may be referred to as an Unmetered Supplies Operator (UMSO).
Demand Disconnection Events
The Host LDSO is required to inform any embedded LDSO when it becomes aware of a Demand Disconnection Event that affects the Embedded Distribution System.
Following the cessation of a Demand Disconnection event the impacted DSOs have to identify the affected SVA Metering Systems that were energised and registered but were not subject to a voluntary reduction in consumption as a result of the event.
The DSO then informs the appropriate Data Collectors and Data Aggregators of the identified MSIDs and the start and end times (in Co-Ordinated Universal Time (UTC)) of the disconnection event within 5 Business Days, updating this information where necessary.
Within 25 Business Days of the Demand Disconnection Event the NETSO has to inform the SVAA of the MSID and the estimated volume of Non-BM STOR Metering systems that were subject to an instruction. The providers of Non-BM STOR have to co-operate with the NETSO in providing this data.
Within one Business Day the SVAA takes the data from the NETSO (above) and provides it to the appropriate Data Collectors and Data Aggregators and provides amendments as necessary.
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