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NHH (Non Half Hourly) Guidance
This page contains links to articles and guidance notes, providing supplementary
information for a number of processes and terms that apply to the Non Half
Hourly market. Each category provides links to further information to support
Parties that operate within this area of the market. This information should be
read in conjunction with the relevant section(s) of the Balancing and
Settlement Code (BSC) and/or Code Subsidiary Documents.
To navigate this page, either select a category below or scroll down the page:
Change of Agent
Change of Supplier
Data Estimation
SVA Data Catalogue
Energisation Status
Estimated
Annual Consumptions and Annualised Advances (EAC/AAs)
Market Domain Data
Meter Readings
Audit Trails
Performance Assurance Board
Settlement Reports
Supplier Meter Registration Service
Supplier Standing Data
Unmetered Supplies
Change of Agent
How to Set and/or Interpret Effective Dates on Supplier Agent
Termination/Cancellation
Master Registration Agreement (MRA) Working Procedure WP100 – ‘Termination/
Cancellation Dates on Agent Appointment’ – provides a framework for Suppliers
and Supplier Agents to appoint, terminate or cancel Supplier Agents. WP100
should be used for Agent cancellations where the Supplier cancels the
appointment prior to the first effective date of the appointment. Further
information on Supplier Agent Termination/Cancellation can be found in
ELEXON LINK – November 2004(73Kb)
.
Change of Supplier
Validation of D0300 Replacement Change of Supplier Reads
ELEXON LINK – February 2004(90Kb)
explains
the processes applied when a Non Half Hourly Data Collector (NHHDC) is asked to
withdraw a Change of Supplier (CoS) reading (D0086 – Notification of Change of
Supplier Readings) and replace it with a revised CoS reading (D0300 – Disputed
Readings on Change of Supplier).
Clarification of Calendar Day and Settlement Day Appointments
ELEXON LINK - December 2002(98Kb)
clarifies
the difference between calendar day appointments and Settlement Day
appointments.
Data Estimation
Procedures should be adopted for reading/estimating metering data following
planned on-site work on CVA Metering Equipment. When routine work is carried
out on-site, it is often necessary for the Meter Operator Agent (MOA) to inject
test units (kWhs) into the meters to check for accuracy and correct operation.
These test units have to be substituted with estimated values or the erroneous
data enters Settlement.
ELEXON LINK – January 2002(362Kb)
contains
an article on Data Estimation Following On-Site Work.
SVA Data Catalogue
Change of Supplier Reads using data flow D0086
Information can be found on: D0086 - Change of Supplier Reads: if the D0086 is
inaccurate it can create large estimated Annual Consumptions (EACs) and
Annualised Advances (AAs), which can affect the volumes of energy processed in
Settlement. Refer to
ELEXON LINK - June 2002(83Kb)
for
more information.
Use of ‘Check Data Collector Data – D0095’ Function
The quality of data that Supplier Meter Registration Agents (SMRAs) and Non
Half-Hourly Data Collectors (NHHDCs) send to Non Half Hourly Data Aggregators
(NHHDAs) is key to the accuracy of Settlement. D0095s are one of the controls
built in to the NHHDA Software Application, which is used to improve the
quality of data. More information is available in
ELEXON LINK – January 2003(64Kb)
.
ELEXON has produced more general guidance on D0095s, contained in
volume 1(187Kb)
and
volume 2(194Kb)
of the D0095 User Guide.
Energisation Status
Energisation Status refers to the status of a Metering System, either Energised
or De-energised. An ELEXON Energisation Project was established to assist in
the resolution of issues arising from the incorrect registration of the
Energisation Status of Metering Systems.
As part of the project,
ELEXON LINK – June 2003(72Kb)
was
accompanied by a
supplement(64Kb)
providing information and guidance to Suppliers on the processes and controls
surrounding the Energisation/De-energisation processes. Additional information
can be obtained from
ELEXON LINK – June 2002(83Kb)
and the Guidance Notes
Energisation Status Project – Supplier Guidance(81Kb)
and
Best Practice in using Energisation Status (62Kb)
.
Entry Process
The term Entry Process refers to the process of entering a Supplier Hub into
the BSC arrangements. A Supplier Hub is the collective term for a Supplier
together with its associated Party Agents. Further information on Entry
Processes is available from
ELEXON LINK – April 2004(61Kb)
.
Please note that on 16 March 2005 the Performance Assurance
Board (PAB) established a process to allow participants wishing to enter the
SVA arrangements to carry out a reduced level of Entry Process testing. This
applies to applicants that intend to implement a new Market Participant ID
(MPID) using existing approved systems and processes. For further information,
see
ELEXON LINK – March 2005(69Kb)
.
Estimated
Annual Consumptions and Annualised Advances (EAC/AAs)
An Estimated Annual Consumption (EAC) is an estimated rate of consumption that
is used in settlement until an Annualised Advance (AA) is calculated. The AA is
the rate of consumption for a Settlement Register over the period between two
meter readings. Annex S-1 of the BSC states that, by the time the final
reconciliation run (RF) takes place, a minimum of 97% of a Supplier ID’s energy
must be reported using actual, rather than estimated, data.
Achieving 97%
ELEXON LINK - November 2002(458Kb)
contains an article detailing the Settlement Process and advice on meeting the
97% standard. Information is also available from the Guidance Note
Advice to Suppliers trying to achieve 97% Annualised Advances at Final Reconciliation(194Kb)
.
Erroneous Large EACs and AAs
In order to ensure the high quality of NHH Settlement data and to meet the
Serial 1 standards (detailed in Annex S-1 of the BSC) for the percentage of
energy settled on AAs at the Third (R3) and Final Reconciliation (RF) runs,
Suppliers and their Agents need effective processes to address exceptions.
Information on resolving the root causes of erroneously large EACs and AAs in
Settlement is contained in
ELEXON LINK – April 2003(75Kb)
and in the Guidance Note
The Management and Resolution of Erroneous Excessive Consumption – Large EAC/AAs(116Kb)
.
Resolving exceptions from the EAC/AA Calculator is covered in
ELEXON LINK – May 2003(70Kb)
.
Market Domain Data
Market Domain Data (MDD) refers to items of data required to be passed from one
party to another by the Supplier Volume Allocation Agent (SVAA).
ELEXON LINK - March 2003(66Kb)
contains a procedure for requesting Meter Asset Provider (MAP) Role Codes in
MDD.
Meter Readings
Processing Meter Readings
All consumption related data received from customers by Suppliers must be sent
to the relevant Data Collector for processing as soon as practicable: this is a
BSC obligation and relates to consumption data from both Half Hourly and Non
Half Hourly customers.
ELEXON LINK – July 2003(68Kb)
provides
further information.
Metering
Systems Registration
Metering Systems should be registered with Settlement data (such as Meter
Timeswitch Code or Standard Settlement Configuration) relating to a ‘Metered’
Measurement Class. The effects of incorrect assignation of SVA Metering Systems
are detailed in
ELEXON LINK - July 2002(93Kb)
.
Audit Trails
Audit trails should be established to ensure that non-compliances with the Code
Subsidiary Documents can be tracked back to origin. Further information on
Audit trails in the NHH market can be found in
ELEXON LINK - March 2002(71Kb)
.
Performance
Assurance Board
The Performance Assurance Board (PAB) is a BSC Panel Committee which oversees
the use of the Performance Assurance Framework within the SVA market. Where
poor performance can impact the accuracy of Settlement, ELEXON and eventually
the PAB will work with a poor performer to raise its performance to acceptable
levels. Further information on the PAB is available from the Information Sheets
Overview of the Performance Assurance Board Escalation Process(50Kb)
and
Overview of ELEXON’s Error and Failure Resolution Process(52Kb)
,
and from the
Performance Assurance Framework section of the BSC (ELEXON) website.
Settlement Reports
Settlement Reports are issued to BSC Parties following each Reconciliation Run.
The reports detail the volumes of energy produced and consumed for each
Settlement Day and provide imbalance information. BSC Parties have requested
details of how credited energy volumes in the SAA-I014 Reports are calculated.
ELEXON LINK – September 2003(100Kb)
describes how credited energy volumes are calculated and details a number of
checks carried out by Suppliers to ensure calculations are correct.
Supplier
Meter Registration Service
The Supplier Meter Registration Service (SMRS) is the system used to register
SVA Metering Systems for a distributor. When Suppliers’ details change they are
obliged to update their registration details. Information on this obligation is
contained in
ELEXON LINK - January 2002(362Kb)
,
The SMRS refreshes are explained in
ELEXON LINK – October 2002(571Kb)
and
ELEXON LINK – August 2004(73Kb)
.
Supplier Standing Data
SVA Standing Data is any data held by the SVAA used to allocate correctly,
consumed energy to a Supplier. Information on these data can be found in
ELEXON LINK - December 2002(98Kb)
edition.
Unmetered Supplies
Unmetered Supplies relates to the supply of electricity to unmetered users such
as streetlights. Information relating to Unmetered Supplies is found in
ELEXON LINK – May 2003(70Kb)
edition and contains guidance on the processes for the recalculation of
Unmetered Supplies EACs following changes in inventory. Information is also
available from the Guidance Note
Clarification of BSC Party and Party Agent responsibilities for Unmetered Supplies(32Kb)
.
CP1080 - 'Supplier and LDSO Controls on UMS' - introduced in the
Supplier Volume Allocation (SVA) June 2005 Release a new process to be
carried out by UMSOs and Suppliers for the first time in November 2005.
For further information download the guidance note
Guidance for Supplier and LDSO Controls on Unmetered Supplies(41Kb)
.
Any questions should be directed to beth.brown@elexon.co.uk
or the ELEXON helpdesk at helpdesk@elexon.co.uk.