Global aggregation recap
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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

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Global Aggregation - Recap

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Global aggregation recap

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

Global Aggregation - Recap

HH Meters

Generator Output

Tran Loss factors

Units delivered to BSP in

Each Jurisdiction

Difference

Readings

Meter data processing

Profiled Demand for NHH customers

Data Aggregation

HHM metered units

AUFs and EUFs

Meter data processing

Residual volume assigned to NIEES /ESBN using Error Supplier Units

Readings

Metered or profiled volumes are uplifted in DA to reflect distribution line losses

NHH Meters

(STS only)


Global aggregation recap

Global Aggregation - Recap

HH Meters

Generator Output

Tran Loss factors

Variance

Profiled Demand for NHH customers

Include DN LLFs

Units delivered to BSP in

Each Jurisdiction

Readings

Meter data processing

HHM metered units

Include DN LLFs

Data Aggregation

AUFs and EUFs

Meter data processing

Variance is ‘smeared’ across Suppliers, method to be determined through SEMO

Readings

Metered or profiled volumes are uplifted in DA to reflect distribution line losses (reports show both vols)


Global aggregation recap1

Global Aggregation - Recap

  • Causes of imbalance?

5


Global aggregation recap2

Global Aggregation - Recap

  • Causes of imbalance?

6


Global aggregation recap3

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 recap4

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 recap5

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 recap6

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 recap7

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

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 recap8

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 recap9

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 recap10

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 recap11

Global Aggregation - Recap

Current Design

Metered Generation Loss Adjusted

MGLF - NDLF

Error Supplier Unit

Metered Demand by Supplier Unit

16


Global aggregation recap12

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

Residual Meter Volume & Smearing

Metered Demand by Supplier Unit

17


Global aggregation recap13

Global Aggregation - Recap

  • 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 recap14

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 recap15

Global Aggregation - Recap

  • Version 2 used the following as paragraph 4.91;

  • Legal suggestion is to retain current 4.91, changing NDLFv’h to NDLFeh;


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Global Aggregation - Recap

  • 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

If no Error Supplier Unit is registered in Jurisdiction e in accordance with paragraph 2.59,


Global aggregation recap17

Global Aggregation - Recap

  • Paragraph 4.92C separated out to two sections to provide Net Demand Adjustment percentage for Suppliers.


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