Section K: Classification and Registration of Metering Systems and BM Units |
Simple Guide |
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Section K of the BSC deals with the classification and registration of
Metering Systems,
BM Units and
Trading Units. The main issues covered include:
identifying the Parties that are responsible for Imports and/or Exports of energy at Boundary Points;
registering the Metering Systems that measure Imports and Exports of energy in the names of the Parties responsible for them;
registering Primary BM Units and assigning Primary BM Units to Trading Units;
registering the Metering Systems at Systems Connection Points in the names of the Parties responsible for them;
the approval of Line Loss Factors by the Panel;
the process to be followed in the event that a Supplier Fails; and
registering Secondary BM Units.
References to BM Unit in the remainder of this document shall be to a Primary BM Unit unless stated otherwise.
Responsibility for Imports and Exports
The BSC sets down rules for identifying Parties that are responsible for Imports and/or Exports of electricity on to or off the Total System over a Boundary Point. Where both Imports and Exports take place at a Boundary Point these must be separately identified and cannot be measured as a single net figure. If more than one Party Imports and/or Exports at a single Boundary Point the Imports and/or Exports of each must be separately identified.
Except for Generating Units in Combined Cycle Gas Turbine (CCGT) Modules, flows to or from any Generating Unit considered a Licensable Generating Plant are combined with flows to or from its unit transformer (if it has one) and the combined flow is considered a single, separate Export or Import and is identified and metered accordingly.
Where the Exports or Imports of electricity from or to an Offshore Power Park Module are associated with a single Balancing Mechanism (BM) Unit then those flows can be considered as a single Export or Import. Metering Equipment to measure these flows can be installed at any location permitted by the appropriate Code of Practice. The point at which the Metering Equipment is installed is then considered to be a deemed Boundary Point, provided that appropriate accuracy compensation is applied to the meter readings as required by that Code of Practice.
Typically a Party is considered to be responsible for an Export if they generate electricity at a Generating Plant. Where the Generating Plant is Exemptable (see below), the party has the option of appointing a third party to be responsible for the Exports at that plant. Broadly speaking generators tend to be Parties that are responsible for Exports.
Typically a Party is considered to be responsible for an Import if they supply electricity to premises. Broadly speaking, Suppliers tend to be Parties that are responsible for Imports. In the case of most Imports to Generating Plant registered under the BSC, the party responsible for the Import is the Party that holds the Generation Licence.
A Party cannot begin the Export or Import of electricity on to or off the Total System over a Boundary Point until it has:
ensured that Metering Equipment is in place to measure the amounts of any Exports and (separately) Imports that they are responsible for (Section L contains details about the requirements of Metering Equipment);
registered the corresponding Metering Systems;
established and registered BM Units;
assigned each BM Unit to a Trading Unit.
In addition the Party responsible for Imports or Exports must ensure that it has in place any necessary Connection Agreements.
Systems Connection Points
Systems Connection Points are
Grid Supply Points and
Distribution Systems Connection Points. A
Distribution Systems Operator is responsible for each
Grid Supply Point and for each
Distribution Systems Connection Point. (
BSCP20 and
BSCP25 set out the process for
Distribution System Operators to agree between themselves which one of them will be nominated as responsible for each
Distribution Systems Connection Point.) Parties responsible for
Systems Connection Points are required to ensure that
Metering Equipment is in place at the
Systems Connection Point to measure the amount of
electricity flowing between the systems and are required to register the corresponding
Metering Systems.
The National Electricity Transmission System Operator (NETSO) and Distribution System Operators are required to inform the Central Registration Agent (CRA) of the location of each Transmission System Boundary Point, Systems Connection Point and Distribution Interconnector Boundary Point. New boundary and/or connection points must not be energised until Elexon has confirmed that a party has undertaken the necessary registrations required in relation to that boundary and/or connection point as outlined above and that applicable Aggregation Rules have been submitted in the case of a Systems Connection Point.
Exemptable Generating Plant
Generating Plant is 'Exemptable' where the company generating electricity at the plant is, or would be if they had no other Generating Plant, exempt from the requirement to hold a Generation Licence.
Where the Party responsible for the BM Unit seeks to take advantage of the additional provisions applying to Exemptable plant, Elexon is required to verify whether or not the plant is Exemptable.
Metering Systems are composed of the commissioned Metering Equipment:
installed to measure Imports and Exports at the Boundary Points associated with the Site for which a Party is responsible; or
installed to measure Imports and Exports a at Interconnector Boundary Points; or
installed to measure flows of electricity at Systems Connection Points at a Site; or
measuring Imports and Exports at a Metering Point, where the Metering System is registered in a Supplier Meter Registration Service (SMRS).
In relation to an Unmetered Supply, the Metering System is the Equivalent Meter or Profiled Unmetered Supply, used to calculate Imports and Exports for which a Party is responsible at a Metering Point.
Typically one Metering System measures Imports and/or Exports at a single Site however the Party responsible has the option to register more than one Metering System in relation to a Site (this option does not exist for Metering Systems registered in SMRS or for Unmetered Supplies). The same Metering Equipment can also be used to measure Imports and/or Exports for which another Party is responsible at the same Site (although in this case, the Metering Equipment would constitute two Metering Systems). A Metering System in SMRS may be used to measure Imports and/or Exports for more than one Supplier under Shared SVA Meter Arrangements as detailed below.
Line Loss Factors are an adjustment factor applied to the readings from a Metering System or group of Metering Systems to adjust for losses on the Distribution Systems and to calculate the associated amount of energy at the Transmission System Boundary.
Licensed Distribution System Operators submit
Line Loss Factors to Elexon annually. The
Licensed Distribution System Operators must calculate the
Line Loss Factors in accordance with an LLF methodology that is compliant with a set of LLF methodology principles set out in
BSCP128 (Production, Submission, Audit and Approval of Line Loss Factors). Each year, the LLF methodology is reviewed by Elexon and is subject to approval by the
Panel.
The Licensed Distribution System Operators must calculate Line Loss Factors in accordance with the approved LLF methodology. Each year, Elexon carry out an audit of the Line Loss Factors as to their compliance with the applicable approved LLF methodology and other requirements of the BSC. In addition Elexon checks that the Licensed Distribution System Operators assign the correct Line Loss Factor Class to its Metering Systems.
Where the non-compliance(s) in the LLF methodology or the Line Loss Factors are not resolved within the specified BSCP timescales, default Line Loss Factors are applied.
Approved
Line Loss Factors, other than
Site Specific Line Loss Factors, may not be revised during the year and the applicable values (whether approved or default) are published on the
BSC Website.
Establishment of Group GSPs
Grid Supply Points are comprised in a Group of GSPs and are referred to as those by which the relevant GSP Group was established as at 1 August 2003. The Panel may determine a revision of the Grid Supply Points comprised in a Group of GSPs in several situations including when there is a new Grid Supply Point, an existing one is decommissioned, as a result of Distribution System developments, as well as at its discretion.
The
Panel must take into account several things when revising in this way, namely geographic factors relating to
Daily Profile Coefficients, the size of the GSP in relation to
GSP Group Correction Factors and the effect of
Boundary Point proximity on the usefulness to the NETSO of
Physical Notifications and
Bid-Offer Pairs submitted in relation to
Supplier BM Units. The
Panel is required to consult with the
Authority, the NETSO, the
Distribution System Operators of the relevant
GSP Groups and all
Suppliers before making any revision in accordance with
BSCP25.
Metering System Registration
A Metering System can either be registered in (CMRS) or (SMRS), (but cannot be registered in both at the same time).
For the avoidance of doubt, the registration of a Supplier’s responsibility for a Metering System takes place in the Central Switching Service (CSS) under the Retail Energy Code (REC). The registration (existence) of the Metering System is recorded in SMRS. SMRS syncs with the CSS via the Electricity Retail Data Service (ERDs) that Licensed Distribution System Operators (LDSOs) provide under the REC.
The following Metering Systems must be registered in CMRS:
Metering Systems for Plant and/or Apparatus directly connected to the Transmission System;
Metering Systems measuring Imports and/or Exports from Licensable Generating Plant (i.e. Generating Plant that is not Exemptable);
Metering Systems measuring Imports and/or Exports for an Interconnector;
any other Metering Systems where the Party applies and the Panel agrees that they should be registered in CMRS;
Metering Systems associated with System Connection Points.
Parties responsible for Exemptable Generating Plant can choose to register their Metering Systems in CMRS and / or to have them registered in SMRS.
The CRA registers
Metering Systems in
CMRS.
BSCP20 specifies the procedures for doing this. In order for
Metering System registrations in
CMRS to become effective certain requirements have to be fulfilled, for example the
Metering Equipment must have been installed and commissioned in accordance with the rules in
Section L of the BSC and a
CVA Meter Operator Agent must have been appointed and registered for the
Metering System in accordance with the rules in
Section J of the BSC. A
Metering System registration becomes effective in
CMRS on the later of the date specified by the
Party applying to register the
Metering System, and the date when the registration requirements have been met and the
Registrant's
Party Registration Data has been registered (as specified in
Section A of the BSC).
Metering System registrations must be kept up-to-date and the
Registrant must notify the CRA or
Central Data Collection Agent (
CDCA) (as specified in
BSCP20) of any change in registration details.
There can only be one Registrant of a CVA Metering System at any one time. The Registrant of a CVA registered Metering System will continue to be the Registrant unless:
the Plant and/or Apparatus associated with the Metering System is disconnected and the Metering System is de-registered;
(where this is allowed) the Metering System becomes registered in SMRS; or
the Registrant withdraws from the registration and another Party becomes responsible for the registration.
Where responsibility for the registration changes ((c) above), the new
Party must comply with the registration requirements and the old
Party cannot stop being responsible for the
Metering System until the new
Party's registration of that
Metering System becomes effective.
BSCP20 sets out further details for the change of registration process.
Where a
Metering System is not (or may not be) registered in
CMRS, it must be registered in the CSS under the REC and thereby in
SMRS. Only a
Supplier can register a
Metering System in CSS/
SMRS. Where a
Supplier intends to supply
Import Active Energy or receive
Export Active Energy from a
Third Party Generator measured by a
Metering System that is (or will be) registered in
SMRS, the
Supplier must provide the
Supplier Meter Registration Agent (
SMRA) with certain information.
Annex K-1 sets out further requirements for
SMRAs in relation to
SMRS. For an
SVA Metering System that contains
Half Hourly Metering Equipment, two or more
Supplier IDs can make a
Shared SVA Meter Arrangement where they are all responsible for
Active Energy Exports or
Imports being measured by that
Metering System.
BSCP550 and
Party Service Line 100 set out further rules for making a
Shared SVA Meter Arrangement. Certain requirements have to be met in order to make a
Shared SVA Meter Arrangement, including one of the
Supplier IDs being nominated as a
Primary Supplier and the submission of an
Allocation Schedule by
Gate Closure. Under a
Shared SVA Meter Arrangement, all
Supplier IDs register the
Metering System in CSS and a different
SVA Metering System number is assigned to each
Supplier. The
Primary Supplier is responsible for ensuring that other registration requirements in relation to that
Shared SVA Metering System are met, for example appointing a single SVA
Meter Operation Agent and
Data Collector (the rules for which are contained in
Section J) and ensuring the
Secondary Supplier ID(s) have access to the data recorded by the
Metering Equipment associated with that
Metering System. Each
Supplier must maintain and update the data for which it is responsible within
SMRS.
BSCP68 sets out the procedures to be followed in the event that a
Party wishes to transfer the registration of a
Metering System from
CMRS to
SMRS (or vice-versa) if that
Metering System is eligible to be registered in either of the registration systems.
Configuration of Primary BM Units
BM Units comprise Plant and/or Apparatus for whose Imports or Exports a Party is responsible.
The configuration of BM Units must either meet the criteria for the configuration of a BM Unit or be an exception to it to be considered as a single BM Unit. The following configurations are classified as exceptions to the criteria for the configuration of a BM Unit and may be registered as a single BM Unit:
Combined Cycle Gas Turbine (CCGT) Modules or Power Park Modules with Metering Systems registered in CMRS;
the station transformer of a Generating Plant whose Metering Systems are registered in CMRS;
premises which are directly connected to the Transmission System at a single Boundary Point;
premises which are directly connected to the Transmission System at more than one Boundary Point, provided that the total Imports to the Plant and/or Apparatus are equal to or less than size of a Small Power Station as defined in the Grid Code (size applicable to both Imports and Exports);
an Interconnector BM Unit (see below);
a Base BM Unit or an Additional BM Unit (see below);
a Combined Offshore BM Unit (with the agreement of the NETSO); and
an Offshore Power Park Module or Combined Offshore BM unit together with any related Plant and Apparatus used to Import electricity to the Offshore Power Park Module or Combined Offshore BM Unit connected to the Transmission System at separate Boundary Points.
The criteria for the configuration of a BM Unit is as follows:
only one Party is responsible for the Imports and/or Exports from or to the Plant and/or Apparatus registered in CMRS (another Party may be responsible for an SMRS registered connection as in point (d));
the Imports and/or Exports relating to the BM Unit are capable of being controlled independently of any other Imports and/or Exports which do not relate to the BM Unit;
the quantities of electricity Imported and/or Exported in relation to that BM Unit in any Settlement Period are or will be submitted to the Settlement Administration Agent (SAA) for Settlement separately from any quantities of Imported and/or Exported electricity from Plant and/or Apparatus not comprised in the BM Unit;
the BM Unit does not contain Plant and/or Apparatus whose Imports and Exports are measured by both CVA and SVA Metering Systems except where:
1. the Registered Capacity of the Boundary Point measured by the Metering System(s) registered in SMRS is equal to or less than the limit determined by the Panel;
2. the Plant and Apparatus cannot Export through the Metering System registered in SMRS; and
3. there are measures in place to prevent instantaneous flow-through of electricity:
i. from the Metering System registered in CMRS to the Metering System registered in SMRS; and/or
ii. between different Systems such as the Transmission System and the Distribution System or between different Distribution Systems; and
Plant and Apparatus with a Registered Capacity of less than or equal to the size of a Small Power Station (as defined in the Grid Code) may be aggregated up to the size of a Small Power Station (size applicable to both Imports and Exports) within a single BM Unit. A BM Unit comprised of Plant and Apparatus with a Registered Capacity of greater than the size of a Small Power Station must be the smallest aggregation of the Plant and Apparatus for which the requirements mentioned in (a) to (c) would be met.
If the configuration of Plant and Apparatus does not meet all the criteria above or is not an exception to that criteria, the configuration of the BM Units may be referred to the Panel for decision. A copy of the Panel's determination is held by Elexon.
The same Plant and Apparatus cannot be contained in more than one BM Unit except in the following scenarios:
where all or part of the Import to the Plant and Apparatus is metered by Metering System(s) registered in both CMRS and SMRS. This may be a single Metering System registered in both SMRS and CMRS and a single Boundary Point or separate Metering Systems at separate Boundary Points. The BM Units may be registered by the same or different Parties; or
Where a Party is responsible for both the Imports to and the Exports from Plant and Apparatus, it cannot register separate BM Units for the Import to and Export from the same Plant and Apparatus measured by the same Metering System.
The registration of the BM Units must be updated if there are changes to the configuration of Plant and Apparatus comprised in those BM Units.
A BM Unit which is composed of Contract for Difference (CFD) Assets can only be composed of the CFD Assets specified in the Contract for Difference relating to that BM Unit and are not allowed to include any other Plant or Apparatus.
A BM Unit (other than a Supplier BM Unit or Interconnector BM Unit) comprised of EII Assets cannot be comprised of any Plant or Apparatus that are not EII Assets and/or EII Assets with a different Exemption Proportion.
Registration of Primary BM Units
Each Party that has responsibility for Imports and/or Exports must ensure that the Plant and/or Apparatus which gives rise to those Imports and/or Exports is comprised in registered BM Units.
BSCP15 contains the procedural steps for registering and reconfiguring
BM Units that are associated with
Metering Systems registered in
CMRS. The CRA administers this registration process. There are a number of pre-requisites to such a
BM Unit registration becoming effective, including the notification of
Generation Capacity (GC) and/or
Demand Capacity (DC) amounts for the
BM Unit, submission of
Aggregation Rules for the
BM Unit (as per
Section R) and the allocation of a
Credit Assessment Load Factor (CALF) value (as per
Section M).
BM Unit registrations become effective on the later of the date specified by the
Party registering the
BM Unit and the date on which all of the pre-requisite conditions have been satisfied.
BM Unit registrations must be kept up-to-date and the
Lead Party for the
BM Unit must notify the CRA of any change in registration details.
Each Supplier is automatically registered as having certain BM Units. This registration is irrespective of whether or not the Supplier has registered any SVA Metering Systems. The Supplier is automatically registered in respect of each of its Supplier IDs as having one BM Unit per GSP Group. These BM Units are known as Base BM Units. A Supplier holding one Supplier ID cannot cancel or withdraw from the registration of a Base BM Unit relating to that Supplier ID for as long as they are a Supplier, but may if they hold more than one Supplier ID and the Base BM Unit relates to an additional Supplier as long as the Supplier has no registered SVA Metering Systems with the additional Supplier ID in any GSP Group. Following the cancellation and withdrawal, the Supplier shall no longer hold the additional Supplier ID.
A
Supplier may also apply to register further
BM Units associated with a
GSP Group. These
BM Units are known as
Additional BM Units. As with
BM Units associated with
Central Volume Allocation (CVA) registered
Metering Systems, the process for the registration and validation of
Additional BM Units is specified in
BSCP15.
A
Supplier can assign the
Plant and/or
Apparatus associated with any of its
SVA Metering Systems in a
GSP Group to an
Additional BM Unit (for that
GSP Group) (subject to certain conditions set down in
Section S of the BSC). Any of a
Supplier's
SVA Metering Systems in a
GSP Group that are not associated with an
Additional BM Unit will be associated with its
Base BM Unit for that
GSP Group.
The previous three paragraphs shall apply on a Supplier ID basis and its provisions construed accordingly.
Where a Supplier is the Registrant of an SVA Metering System associated with Contract for Difference (CFD) assets, the Supplier is responsible for the registration of an associated Additional Supplier BM Unit, and for ensuring only the relevant CFD assets are assigned to such BM Units.
Where it is not known which Supplier will take responsibility for Metering Systems associated with a generator with a CFD, Elexon will register Additional BM Units for a set of Suppliers. The set will be based on a list maintained by Elexon which identifies Active Power Purchasing Suppliers in each GSP Group, along with any other Qualified Half Hourly Supplier that has requested to be included on that list.
Should Elexon receive notice from the
EMR Settlement Services Provider with respect to
CFD Assets regarding the registration or deregistration of
Additional BM Units in a
GSP Group Elexon will register or deregister (as appropriate) such
Additional BM Units in accordance with
Section K of the BSC.
Demand Capacity ("DC"), Generation Capacity ("GC"), Production and Consumption
The Lead Party of a BM Unit is required to notify its estimate of the most positive and most negative value of BM Unit Metered Volume (in MWh) for that BM Unit in any Settlement Period in a BSC Season. These estimates must be notified first when the BM Unit is registered, and subsequently at least 10 Working Days in advance of each BSC Season. The CRA divides the BM Unit Metered Volumes by the Settlement Period Duration (SPD) to convert the MWh value into a MW GC or DC. If no GC or DC declaration is made by the Lead Party in advance of the next BSC Season, the latest GC and DC values from the preceding BSC Season will be used. Where no preceding BSC Season values are available, the values shall be zero.
The estimates must also be re-notified within a
BSC Season if at any time the
Lead Party becomes aware, or ought reasonably to have become aware, that the previously submitted estimates are going to be (or have been) exceeded by certain tolerances published on the
BSC Website by Elexon. In addition, the
Lead Party of a
Supplier BM Unit may, up to twice in each
BSC Season, notify increases in its previous estimate of the most negative value of
BM Unit Metered Volume for the
BM Unit. The NETSO can ask the
Panel to review any estimates submitted by Lead Parties. The procedural steps for the notification of these values are specified in
BSCP15.
If the Lead Party of a BM Unit in GC or DC breach believes that the replacement GC and/or DC value is incorrect, they have the option to challenge it and propose an alternative GC and/or DC value. Guidance for the challenge process is also provided in the Generation Capacity (GC) and Demand Capacity (DC) Estimation Methodology and Challenge Guidance.
The Panel, or its delegated Panel Committee, can review and amend the current DC and GC tolerance limits as it sees fit. Any proposed changes to DC and GC tolerance limits will be issued to BSC Parties for consultation. Following the end of the consultation, the results of the consultation will be presented to the Panel or its delegated Panel Committee and a decision will be made whether to change the DC/GC tolerance limits or not. Elexon will notify BSC Parties of any amended values, as well as the date from which they will be effective. Elexon will publish the new values on the BSC Website with their Effective From Date.
New values will be effective from the beginning of the next BSC Season, so long as there are at least 20 Working Days between the date of the Panel’s decision and the start of the next BSC Season. Otherwise the new values will become effective from the beginning of the following BSC Season.
The GC for a BM Unit is the notified estimate of the most positive BM Unit Metered Volume, divided by the duration of each Settlement Period (i.e. half an hour). The DC for a BM Unit is the notified estimate of the most negative BM Unit Metered Volume, again, divided by half an hour.
If the GC plus the DC for a BM Unit is greater than zero, the Relevant Capacity of that BM Unit is GC. Otherwise the Relevant Capacity of the BM Unit is DC.
A BM Unit is classified as a Production BM Unit if the sum of Relevant Capacities of the BM Units in the Trading Unit to which it belongs is greater than zero. Otherwise the BM Unit is classified as a Consumption BM Unit. The Production or Consumption status of a BM Unit is recalculated whenever the configuration of the Trading Unit to which the BM Unit belongs changes, and whenever the DC or GC of the BM Units within the Trading Units change.
For an Exempt Export BM Unit or a Storage BM Unit which belongs to a Sole Trading Unit, the Lead Party can determine its Production/Consumption status. An Exempt Export BM Unit is a BM Unit comprising CVA registered Metering Systems associated with Exemptable Generating Plant, whilst a Storage BM Unit is a BM Unit consisting solely of Storage Modules.
Changes in BM Unit Registration
The configuration of a
BM Unit can change if the
Party responsible for
Plant and/or
Apparatus comprised in a
BM Unit registers different
BM Units comprising those
Plant and/or
Apparatus.
BSCP15 contains procedural steps relating to such changes.
Certain charges are calculated on the basis of
BM Unit Metered Volumes and these charges are detailed in
Section T.
Credit Qualifying BM Units
Credit Qualifying BM Units are treated differently in the Credit Calculation (see
Section M for more details). A
BM Unit is credit qualifying if it meets the following criteria:
It submits Final Physical Notification (FPN) data to the NETSO; and
It is not an Interconnector BM Unit; and
It is one of the following:
A Trading Unit is a group of one or more BM Units. BM Units in a Trading Unit are afforded net treatment in their use of the Transmission System. This means that if demand in the Trading Unit is met directly by generation in the Trading Unit (or vice versa) only the net of the two will be traded over the system.
For each GSP Group, there is a unique Base Trading Unit that comprises all Supplier BM Units and all participating Exempt Export BM Units in the relevant GSP Group. Exempt Export BM Units are allocated automatically to the Base Trading Unit upon registration; however, they can opt out of the Base Trading Unit if they wish. Supplier BM Units cannot opt out of the Base Trading Unit.
The CRA administers the
Trading Unit registration process and the steps are explained in
BSCP31.
The relevant Interconnected System Operator is required to have in place Metering Equipment and register Metering Systems for measuring Imports and Exports at the Interconnector Boundary Point(s) associated with an Interconnector. The Interconnected System Operator is either the NETSO or a distribution company (if the interconnection is to the Transmission System it is the NETSO, if the interconnection is to a Distribution System it is the distribution company).
An Interconnector Error Administrator (IEA) and Interconnector Administrator (IA) must be appointed by the Interconnected System Operator and registered in the Central Registration Service (CRS) prior to a new Interconnector being energised.
No Party may Import or Export across an Interconnector Boundary Point unless an IEA has been appointed and registered in CRS.
Neither the IEA nor the IA may withdraw its consent to act as such (and the Interconnected System Operator cannot terminate their appointment) until another Party has been appointed to act in its place.
If there is no IEA in place at any given time or the company appointed as IEA stops being a
Party (or their registration is removed by the
Panel as per the rules in
Section H of the BSC), the
Interconnected System Operator must within 30 days either appoint itself as IEA or de-energise the
Interconnector (subject to the approval of the
Panel, and the
Authority or
Secretary of State as appropriate). Prior to the expiry of the 30 days, the
Interconnected System Operator must assume the responsibilities of the IEA.
If there is no IA in place at any given time or the person appointed as IA stops being a Party or the IA is in Default or the Interconnected System Operator becomes the IEA by default, the BM Unit Metered Volumes for the Interconnector BM Units of relevant Interconnector Users are set to zero. Note that this rule does not apply to the BM Unit Metered Volumes of the IEA's Interconnector BM Units.
If there is no IA in place at any given time or the company appointed as IA stops being a
Party or the IA is in
Default or the
Interconnected System Operator becomes the IEA, the
BM Unit Metered Volumes for the
Interconnector BM Units of relevant
Interconnector Users are set to zero. As a consequence, the application of the
Settlement rules in
Section T will mean that the
Interconnector Metered Volume will be attributed to the
BM Units of the IEA.
The IEA is automatically allocated two Interconnector BM Units (one Production BM Unit and one Consumption BM Unit). Any Trading Party can apply to register Interconnector BM Units in relation to an Interconnector, by following the normal BM Unit registration process. However, the requirement to associate Metering Systems with such BM Units does not apply. Such Interconnector BM Unit registration cannot become effective until the Interconnected System Operator has registered the related Metering Systems for the Interconnector, and an IA and IEA are registered. Each Party that registers Interconnector BM Units is allocated a Production BM Unit and a Consumption BM Unit in relation to that Interconnector.
For the purposes of identifying the Relevant Capacity of BM Units, for Production Interconnector BM Units the DC is always zero and for Consumption Interconnector BM Units the GC is always zero.
An Interconnector BM Unit that is associated with an Interconnector that has Boundary Points at more than one Site can only be a Sole Trading Unit and cannot form Trading Units with other BM Units.
Section K describes the process to be followed for re-allocating responsibility for
Imports and/or
Exports of any
Metering System in the event that a
Supplier fails and/or goes out of business.
If a Supplier is failing, a Replacement Supplier may be appointed (either a Supplier of Last Resort, directed by the Authority, or a Transferee where a Trade Sale has taken place). The Affected BM Units for which the Replacement Supplier is to become responsible are identified (either in the direction appointing a Supplier of Last Resort or in the transfer notice, as applicable). The Replacement Supplier is then treated as being responsible for the Imports and/or Exports associated with those Affected BM Units, as the Registrant for the Metering Systems associated with those Affected BM Units and is subject to rights and/or obligations and benefits and/or liabilities connected with those Metering Systems and Imports and/or Exports, in respect of Settlement Periods arising on or after the time when the Replacement Supplier is appointed. It should be noted that the Replacement Supplier is treated as being responsible, even though it may not be registered as being responsible in the relevant registration systems. The equivalent responsibilities of the failing Supplier end in relation to such Settlement Periods going forward. The appointment of the Replacement Supplier takes effect, in the case of a Supplier of Last Resort, from 00.00 hours on the Appointment Day, and in the case of a Transferee, from the time and date specified in the transfer notice.
Any contract notifications for which the
failing Supplier is a
Contract Trading Party (in the case of
Metered Volume Reallocations, only those where the
failing Supplier is the
Subsidiary Party) shall continue to apply for the purposes of
Settlement under
Section T.
Metered Volume Reallocations where the
failing Supplier is the
Lead Party cease to have effect.
The CRA is required to establish BM Units for which the Replacement Supplier is registered as Lead Party in the central systems, which are the same as the Affected BM Units. These registrations are known as Replacement BM Units. Each Replacement Supplier BM Unit will have the same attributes as the Affected BM Units that they are essentially replacing. However the Lead Party may change those attributes in the future, subject to the normal BSC procedures and processes for changing such attributes. The Replacement Supplier BM Unit registration is treated as being effective from the time of appointment of the Replacement Supplier. Once the Replacement Supplier BM Unit has been registered, any further rights and/or liabilities arising in relation to the Affected BM Unit which it has replaced are allocated to the Replacement Supplier BM Unit.
The
Replacement Supplier (where there is more than one replacement
Supplier appointed) must, within 3 months of its appointment, effect the registration of the
Metering Systems associated with the
Replacement Supplier BM Units and the appointment of
Party Agents in relation to those
Metering Systems (as per
Section J) and take any other steps required to comply with other parts of the BSC in relation to the registration of those
Metering Systems.
Configuration and Registration of Secondary BM Units
Secondary BM Units comprise Plant and/or Apparatus with which the Virtual Lead Party of the Secondary BM Unit may provide Balancing Services. Secondary BM Units must have the following characteristics:
Secondary BM Unit must only comprise Plant and Apparatus measured by Half Hourly SVA Metering Systems within the same GSP Group; and
Half Hourly SVA Metering System can only be allocated to one Secondary BM Unit.
The Virtual Lead Party of the Secondary BM Unit can determine the Secondary BM Unit’s Production/Consumption Status.
BSCP15 contains the procedural steps for registering
Secondary BM Units. The CRA administers this registration process.
Annex K-1 – Supplier Meter Registration Service
Annex K-1 sets out the obligations that
LDSOs, in their capacity as
SMRAs, must fulfil regarding provision of an
SMRS. It does this either directly or by reference to other parts of the BSC or
BSCP501. The
SMRS obligations include:
A description of the service to be provided under the BSC, including service availability and terms;
Entry requirements regarding the obligation to deliver, and right to receive, an SMRS;
The minimum service levels that SMRAs must meet and the associated liquidated damages payable to Suppliers, Data Aggregators and Elexon if they do not (except in specified circumstances of SMRA Force Majeure);
Obligations regarding the accuracy and provision of SMRS data; and
How LDSOs may levy charges on Suppliers, Data Aggregators and Elexon for providing additional related services.
Annex K-2 – Trading Unit Applications
Annex K-2 contains the requirement for each Trading Unit application to specify the class of Trading Unit that it is, and contains information on the different classes of Trading Units.
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