Global Aggregation - Recap
 What is Global Aggregation?
 Process of providing an aggregation for all registered Suppliers
 Includes aggregation of Host Suppliers
 Current implementation means Host Supplier calculated by difference
 Error Supplier Unit in the SEM
 Not just Host Supplier volumes but also other errors included
2
Global Aggregation - Recap
HH Meters
Tran Loss
factors
Readings
Meter data
processing
Data
Aggregation
AUFs and
EUFs
Meter data
processing
Difference
Profiled
Demand
for NHH
customers
Units
delivered to
BSP in
Each
Jurisdiction
HHM
metered
units
Residual volume assigned to NIEES /ESBN
using Error Supplier Units
Readings
NHH Meters
(STS only)
Generator
Output
Metered or profiled volumes are uplifted in DA to reflect
distribution line losses
Global Aggregation - Recap
HH Meters
Readings
Meter data
processing
Profiled
Demand
for NHH
customers
Include DN
LLFs
Data
Aggregation
HHM
metered
units
AUFs and
EUFs
Include DN
LLFs
Meter data
processing
Readings
Tran Loss
factors
Variance
Units
delivered to
BSP in
Each
Jurisdiction
Generator
Output
Variance is ‘smeared’ across Suppliers,
method to be determined through SEMO
Metered or profiled volumes are uplifted in DA to reflect
distribution line losses (reports show both vols)
Global Aggregation - Recap
 Causes of imbalance?
Physical inaccuracy
Back door supplies
Interconnector losses
Meter errors
Meter errors
Umetered embedded generation
Theft
Line losses
Transformer losses
Power Stations &
interconnectors
Transmission Network
Distribution Networks
Customers
(end users)
5
Global Aggregation - Recap
 Causes of imbalance?
Data Errors
Station aggregation rules
TLAFs
Power Stations &
interconnectors
DLAFs
Transmission Network
Distribution Networks
Umetered Supply
Profiles
Energisation Status
Customers
(end users)
6
Global Aggregation - Recap
 Causes of imbalance?
 Elexon experience of Global Aggregation;
 Incorrect profiles of non-interval meters considered chief contributor;
 Modification 34_09 developed with a view to smearing residual volume
across all suppliers, taking account of each suppliers share of non-interval
metered consumers;
7
Global Aggregation - Recap
 Mod 34.09 raised by ESB CS
 Mod proposed separation of SU into Interval SU and Non-Interval SU
 Raised at Mods Meeting 24 (29.09.09)
 Mods Panel recommended setting up Working Group to explore further
 Terms of reference for Working Group circulated, Nov 2009
8
Global Aggregation - Recap
 Working Group 1, held on 19th November 2009.
 Presentations & Discussion –
 ESB CS suggested assigning ESU to non-competing Party under the Code;
 MDPs presented on impact on systems;
Actions –
 SEMO & RA to meet to further develop options;
 ESB CS & NIE to provide estimation of error;
 Mods Panel to decide if impact assessments should be sought;
9
Global Aggregation - Recap
 SEMO & RA met December 1st to develop options paper;
 Four options written up and circulated –
 Option A – recovered through SEMO balancing cost;
 Option B – smear across Suppliers based on annual factors;
 Option C – smear across Supplier based on monthly factors;
 Option D – as set out in modification proposal;
10
Global Aggregation - Recap
 Working Group 2, held on 23rd February 2010.
 Presentations & Discussion –
 Suppliers presented on magnitude of actual error;
 SEMO & MDPs presented results of impact assessments;
 MRSO proposed option E, further enhancement on option C;
 Actions –
 SEMO & MDPs to meet to further review options D and E;
 SEMO to impact assess options A+ and E;
11
Global Aggregation - Recap
 Meeting between MRSO, NIE T&D and SEMO took place on March 5th;
 Further review of Options D and E;
 Option E confirmed as
 Aggregation for Supplier Units as normal;
 Inclusion of a % value for each Trading Period;
 % value will indicate at a MW level the proportion of the aggregation that is
made up of non-interval metering;
12
Global Aggregation - Recap
 Working Group 3, held on 27th April 2010.
 Presentations & Discussion –
SEMO presented on MDP meetings and further impact assessments;
 EirGrid presented on TUoS impacts;
 Actions –
SEMO to issue consultation on options A+ and E;
TSO to review implementation of Option A for TUoS;
13
Global Aggregation - Recap
 Consultation document issued on June 17th;
 Participants asked to express preference between Option A+ and Option E;
 Responses welcomed on discarded options B, C and D;
 Nine responses received to Consultation
 Five responses favoured Option E (2 Participants, 3 service providers)
 Three responses favoured Option A+
 One response recommended either option
14
Global Aggregation - Recap
 Working Group 4, held on 26th August 2010.
 Presentations & Discussion –
 Recap and review of consultation responses;
 Full impact assessment on SEMO systems is approx 1200 hours or €210 K
Noted flexibility in Option E to allow for implementation in one jurisdiction
ahead of the other;
 Stressed importance of decision;
Consensus reached on recommendation of Option E;
15
Global Aggregation - Recap
Current Design
Metered Generation
Loss Adjusted
MGLF - NDLF
Metered Demand by
Supplier Unit
16
Error Supplier Unit
Global Aggregation - Recap
Option E Design
Metered Generation
Loss Adjusted
MGLF - NDLF
Error Supplier Unit
Metered Demand by
Supplier Unit
Metered Generation
Loss Adjusted
MGLF - NDLF
Metered Demand by
Supplier Unit
17
Residual Meter
Volume & Smearing
Global Aggregation - Recap

 NDvh 1  NIEPvh
 NDvh NIEPvh 


NDAvh  REVLFeh RMVIPy 

1

RMVIPy


 ANINDeh  
AINDeh



 After calculation of residual error volume;
 Allocated across all Suppliers in the SEM;
 Residual Meter Volume Interval Proportion – sets how much of the error
volume is allocated based on a Suppliers interval metered customers;
 Non-Interval Energy Proportion – advises what portion of the aggregated
Metered Demand is based on non-interval metered customers;
Global Aggregation - Recap
 Version 2 of modification before Committee today;
 Meeting with subgroup of Participants to review detail;
 Further discussions with RAs on Version 2;
 A number of changes are proposed for legal drafting;
 Intent of the modification is not impacted by proposed changes;
Global Aggregation - Recap
 Version 2 used the following as paragraph 4.91;
NDLFv' h   MGLFuh  MDLFvh NIJIeh
u ine
v in e
 Legal suggestion is to retain current 4.91, changing NDLFv’h to NDLFeh;
NDLFeh 
 (MGuh)   (MDvh)  NIJIeh
u in e
v in e
  ( MGuh)  NIJIeh


  u in e
  ( MGuh)   ( MGLFuh)   ( MDLFvh)   ( MDvh)   

MGuh
u
v
v
 u
 


e uine


Global Aggregation - Recap
NDLFeh   MGLFuh  MDLFvh NIJIeh
u ine
v ine
 Paragraph 7.12 updated also;
 Creation of NDLFeh allows the value to be allocated to either the Error
Supplier Unit or the Residual Error Volume
 Paragraph 4.91A
 Paragraph 4.91 B
NDLFv ' h  NDLFeh
If no Error Supplier Unit is registered in
Jurisdiction e in accordance with paragraph
2.59,
REVLFeh  NDLFeh
Global Aggregation - Recap

 NDvh 1  NIEPvh
 NDvh NIEPvh 


NDAvh  REVLFeh RMVIPy 

1

RMVIPy





AINDeh
ANINDeh





 Paragraph 4.92C separated out to two sections to provide Net Demand
Adjustment percentage for Suppliers.
 NDvh  1  NIEPvh
 NDvh  NIEPvh


NDAFvh  RMVIPy 

1

RMVIPy


 ANINDeh 
AINDeh




NDAvh  REVLFeh  NDAFvh