I-SEM FAQs

Below are questions and answers raised by Market Participants in relation to I-SEM. As additional questions arise they, together with their answers, will be posted below.

Date Where Raised
02.11.16 IGG
Question 1
At the May 2016 IGG , the ESB Networks I-SEM Programme asked Suppliers if they could start thinking about Market Trials and what sort of data Suppliers and TSO are interested in getting from the Retail Market when ESB Networks is providing data to the Wholesale Market.
Answer 1
Unscripted Phase of the Market Trials & the RoI Retail Market For the I-SEM Market Trials Unscripted phase, our intention for RoI Suppliers and Eirgrid TSO is to make available: • For Suppliers; the 341,59x series of messages and 342 message for the Supplier’s own generators. • For Eirgrid TSO; the 341,59x series of messages and 342 messages including those GUs and SUs that are moved during market Trials so that MRSO becomes their MDP for Market Trials Naturally this means that if you want to get these messages from the Market Trials then you will need to have a test EMMA that is available for the duration of the Unscripted Market Trials phase.
Date Where Raised
11.01.17 IGG
Question 2
ESB Networks I-SEM Programme is considering drafting a new Market Trials WP12 to accommodate Participant GU registration changes being requested specifically for Market Trials.

Would you see any need for this and would you use it?

Answer 2
Based on Supplier feedback , ESB Networks I-SEM Programme is planning on bringing a DR to the Retail Market in Q2/2017 to allow for arrangements specifically for Market Trial, for each of WP12 & WP14

Supplementary Information from ESB Networks I-SEM Programme

All Retail Market Suppliers may wish to participate in the I-SEM Project’s Market Trial.

If that Supplier wants to have different De Minimis NPGEN arrangements reflected in the data that MRSO aggregate for Market Trials as against that which is aggregated as business as normal , then they will need a way to communicate that to the ESB Networks I-SEM programme team (WP14 is the mechanism for Production)

The Supplier may want to have their Retail Market test EMMA hooked up to get the Retail Market Messages that will flow from the Market Trials test environment (viz 59x and 34x series of messages)

If the Supplier needs a different WP12 arrangement for Participant Generators for the Market Trials than that which is catered for as business as normal, then they will need a way to communicate that to the ESB Networks I-SEM programme team (WP12 is the mechanism for Production)

Therefore, when Suppliers are working through your Registration requirements for I-SEM project’s Market Trials you can consider the information above, and if you find you need to set up something different for Market Trials than what is in Live Production, you will be able to let us know and we will reflect these changes.

Date Where Raised
11.01.17 IGG
Question 3
Can ESBN provide clarity as to whether they will be able to accommodate a situation whereby a Generation Unit is registered with one supplier in SEM but with another supplier in ISEM? Will the systems be able to accommodate the varying parties during the resettlement period until SEM is completely shut down?
Answer 3
It will be possible to accommodate a situation whereby a Non Participant Generation Unit is registered with one supplier in SEM up until the final resettlement of the SEM and with another supplier in ISEM.
Date Where Raised
11.01.17 IGG
Question 4
SEM-O have proposed that there would be a freeze on market registration for 3 months before ISEM go-live.

Is it likely this freeze would extend to the registration of export arrangements for Non Participant Generators?

Answer 4
This will not impact on the Non Participant Generators as this is a Retail Market function and at the moment ring-fenced from any I-SEM changes.

However if this was to change we would inform the Retail Market through the usual Supplier forum, the IGG.

Date Where Raised
08.03.17 IGG
Question 5
Can ESBN reaffirm that for I-SEM Go-Live, No Changes are indicated to the Harmonised Retail Market Schema or the COBL?
Answer 5
ESBN can confirm that for I-SEM Go-Live, No Changes are indicated to the Harmonised Retail Market Schema or the COBL.
Date Where Raised
08.03.17 IGG
Question 6
Will a schema change be needed as a result of the Supplier Charging Decision?
Answer 6
Yes , it is likely that there will be a Retail Market Schema change needed to facilitate the Supplier Charging decision however this will be a future change which would occur no earlier than January 2020.

Background

On 16 February 2017 the SEM Committee published a decision on the appropriate basis for the levying of supplier charges in I-SEM. This followed a consultation paper on the matter which was published on 3 October 2016. In the consultation paper three potential bases on which supplier charges could be levied on suppliers in I-SEM were discussed: Net Demand; Non-Negative Net Demand; and Gross Demand.

SEM Committee Decision (precis from SEM-17-010)

(a) SEMC instructs both SEMO and the MDPs to implement, as an interim solution, the necessary systems to allow the Net Demand approach to be available for I-SEM Go-Live

(b) The SEMC considers that the arguments in favour of the Gross Demand approach have considerable merit and on this basis, is minded to transition to a Gross Demand approach as the enduring approach to the levying of supplier charges. Pending a final decision on the enduring approach, the SEMC is requesting SEMO and the MDPs to ensure that their systems also have the capability to provide for a transition to a Gross Demand approach for supplier charges. The SEMC will determine the enduring approach to the basis for supplier charges at a later date, and will also set out the conditions under which a transition, which would occur no earlier than January 2020, could take place.

Full document can be found at this path http://semcommittee.us13.list-manage.com/track/click?u=35760ee9da0c8ccdadfbaa4c8&id=85f8531af1&e=8a04b83e35

Date Where Raised
10.03.17 Email Query from Supplier 10.03.2017
Question 7
We have a question in relation to MCR1182 2.1.2. MPD 15 Section 3.6 (page 8)

viz :  Where Distribution Connected Participant Generators have Price Effecting Generation they will not be sent 342 messages from MRSO, instead, that export data would be available to the participant via the EirGrid website

Our understanding is that this data has not been available on the Eirgrid website since Jul 14. Can you advise if Eirgrid intend to make their data available via their website going forward? We would support the provision of this data via Eirgrid as it would provide an independent data source.

Answer 7
This item is Out of Scope for ESB Networks I-SEM Programme

Eirgrid is the MDP responsible for the provision of this data ; The Supplier would need to contact Eirgrid directly in relation to this query.

Date Where Raised
12.07.2017 Supplier Email Query
Question 8

We have reviewed the ESB document entitled “Impact of I-SEM on the RoI Retail Market – Discussion Document DR1182”.  We understand the proposed changes to Market Messages 595 and 596 are described in MPD 16 2.1 (Data Aggregation) and MPD 15 (Data Aggregation) in Discussion Document DR1182.  As we are only involved in the supply of electricity to QH and NQH customers and not involved in any power generation activities, we do not believe these changes are relevant to ourselves.  Is our understanding correct?

Answer 8

No changes are indicated to the Harmonised Retail Market Schema or the COBL, and no market messages are changing as a result of I-SEM

The ESB Networks I-SEM Programme is unable to comment on the impact of the I-SEM on any individual Supplier.

Date Where Raised
11.07.2017 Supplier Email Query
Question 9
Our query is around a Gemserv survey ; we were under the impression there was little change to retail market messages as a result of ISEM. We haven’t planned for amending any of our systems, just wondering should we be?
Answer 9
You are correct; there is no change to any Retail Market Message.

Please refer to the ESB Networks I-SEM Programme presentations at the IGG; here is the path to the most recent presentation for the IGG meeting that was held on the 26th June 2017 viz.
https://rmdsie.files.wordpress.com/2017/06/esb-networks-i-sem-programme-presentation-to-the-igg-28th-june-2017-ver-1.pdf

Slide #2 outlines our High Level Understanding and as you will see there are no changes to any of the Retail Market Messages viz ‘No Changes are indicated to the Harmonised Retail Market Schema or the COBL’
.

Date Where Raised
27.07.2017 Supplier Informal Query
Question 10
Will there be a change to MM341 , MM342, or MM 596 or MM597 as a result of the I-SEM Trading Day changing from 06:00-06:00 in the SEM to 23:00-23:00 in the I-SEM?
Answer 10
No, there will be no change to MM341, MM342, MM596 or MM597 as a result of changes in the Trading Day in the I-SEM.

These messages currently contain data based on a calendar day and this will not be changing.

Date Where Raised
27.07.2017 Supplier Informal Query
Question 11
Will there be a change to MM341 or MM342 or MM596 or MM597 for New Registration or De Registration of a Unit in the I-SEM as a result of the I-SEM Trading Day changing from 06:00-06:00 in the SEM to 23:00-23:00 in the I-SEM?
Answer 11
No, there will be no change to MM341, MM342, MM596 or MM597 for New Registration or De Registration of a Unit in the I-SEM as a result of the I-SEM Trading Day changing from 06:00-06:00 in the SEM to 23:00-23:00 in the I-SEM : Message 341 , 342, 596 and 597 data is based on a calendar day and this will not be changing.

For information: MM590 is a Wholesale Market Message and NOT a Retail Market message and is sent to SEM-O from MRSO. In the I-SEM, when this contains data for a Unit that is undergoing a New Registration or De Registration event then the data for that Unit will be changing to reflect the changes in the length of the Trading Day in the I-SEM. However this change will not impact on the Retail Market. This is reflected in our Retail Market Change Request MCR1182 ; see embedded doc ‘Impact of the I-SEM on the Retail Market in Ireland’ Section 1.3 Items not considered in detail in this document, paragraph B. Here is the path to MCR1182 viz. https://rmdsie.files.wordpress.com/2017/05/mcr1182-impact-of-i-sem-on-the-retail-market-in-roi.pdf.

Date Where Raised
10.08.2017 Supplier Email Query
Question 12
Will there be an increase in the amount of data contained in 595 Market Messages and the quantity of 596 Market Messages
Answer 12
We understand that Suppliers are free to register more than one SU with SEM-O in the SEM and that this facility will continue to be possible in the I-SEM. Should a Supplier register an additional SU with SEM-O , naturally this will increase the amount of MM591, MM595 and MM596 that will be generated in the Retail Market for that Supplier. Likewise should a Supplier De-Register an SU and therefore reduce the amount of SUs that they have registered with SEM-O then that would reduce the amount of MM591, MM595 and MM596 that will be generated in the Retail Market for that Supplier. Should a Supplier have more than one SU registered with SEM-O then that Supplier has the ability , subject to certain constraints (see MPD20*) , to move an MPRN in the Retail Market between 2 of their registered SUs , should they so choose, and for their own commercial reasons. Naturally such a move would impact the volumes contained in the various MM591, MM595 and MM596 , up or downwards, depending on the direction of the move.  *See MPD20 on the RMDS website at this path viz https://rmdsie.files.wordpress.com/2015/07/mpd-20-change-of-ssac-and-or-supplier-unit.pdf.