GME informs market participants that, as of today, with the publication on GME’s website, the updated versions of the following Technical Rules will enter into force: Technical Rules no. 03 rev 02 MLF, no. 09 rev 02 MLF, and no. 01 rev 01 MLT. These Technical Rules have been amended in order to enable the DSO Unareti S.p.A. to offer voltage/reactive power control services on Forward Flexibility Markets (MLT-Flex).

In this regard, it is worth noting that, with its Resolution 140/2026/R/EEL of 28 April 2026, ARERA approved the new draft Regulation of the MindFlex project of the DSO Unareti S.p.A. for the June–December 2026 period. This draft Regulation enables the DSO to procure voltage/reactive power control services on the MLT-Flex.

Following to the news of 11 May 2026, to allow interested parties to test the new features concerning the supply of reactive power services (included among the products to be auctioned on 26 May session), GME will organise blank test sessions according to the following procedure and timetable.

Blank test timetable.

Blank tests will take place on GME’s test platform (available at https://prove-mindflex.ipex.it/FlexWa/Login.aspx), on 21 May according to the following timetable:

1. Sitting for submission of bids/offers: from 10:00 to 15:00;
2. Determination of results and their notification to market participants: within 17:00.

The tests will be open to all BSPs authorised by UNARETI S.P.A. and GME. Before the tests, the BSPs may obtain the credentials for access to the test platform by writing to proveme@mercatoelettrico.org. If there are BSPS that have not yet been authorised but have expressed interest in taking part in the tests, their requests will be assessed jointly by GME and UNARETI S.p.A.

Further details about the tests will be available on the test platform.

The transactions carried out during the tests will not be binding and will not give rise to any obligation. For any queries, please write to: proveme@mercatoelettrico.org.

Having received a request of activation of a trading session of the MLT-Flex from the DSO Unareti S.p.A., GME informs Market Participants, under art. 23, para. 23.2 of the MLF Regulations, that:

1. the trading session will be held on 26/05/2026;
2. the preliminary information about the MLT-Flex session, necessary for carrying out the trades, will be made available in the MLF information system on 25/05/2026;
3. the sitting for submission of offers will be opened at 10:00 on 26/05/2026;
4. the sitting for submission of offers will be closed at 15:00 on 26/05/2026;
5. the preliminary results of the session will be communicated and published in the MLF information system within 14:00 on 27/05/2026;
6. the final results of the session, after the technical validation of offers by the DSO, will be communicated and published within 12:00 on 28/05/2026.

Further to the press release issued by the Market Coupling Steering Committee (MCSC) on 7 May 2026 – implementing ACER’s “Harmonised Maximum and Minimum Clearing Price Methodology for the Single Day-Ahead Coupling”, introduced under art. 41, para. 1, of Commission Regulation (EU) 2015/1222 (CACM Regulation) – GME informs market participants that, as of the MGP session of 28 May 2026 (flow date: 29 May 2026), the minimum technical limit of bids/offers in the MGP will be reduced by 100 EUR/MWh and set at -600 EUR/MWh.

In this regard, with a view to implementing the above provisions as of the aforementioned MGP session (flow date: 29 My 2026), the updated version of Technical Rule no. 20 MPE (Technical Rule no. 20 rev. 04 MPE on “Technical limits of bids/offers in the MGP, MI, and MSD”) will also enter into force.

To support market participants, the following version of Technical Rule no. 20 rev. 04 MPE, entering into force on 27 May 2026, is made available below solely for information purposes.

1. Technical Rule no. 20 rev. 04 MPE

On 30 April 2026, Terna (Transmission System Operator) has issued a notice (https://www.terna.it/it/sistema-elettrico/pubblicazioni/news-operatori/dettaglio/fcr-modifiche-mercati-dal-3-giugno-2026-piano-prove-11-22-maggio-2026), communicating the time window of its own blank tests concerning the changes to be made in view of the introduction of the FCR on 3 June 2026, in compliance with Testo Integrato del Dispacciamento Elettrico (TIDE – Integrated Text of Electricity Dispatching Rules – Annex A to ARERA Resolution 345/2023, as amended and supplemented by subsequent resolutions and, lastly, Resolution 51/2026). Further to the above-mentioned notice, GME informs that it will organise special blank test sessions with market participants, in order to enable them to test the new features of the IPEX platform.

GME’s blank test sessions will be held in May, in the periods from 11 to 15, and from 18 to 22, according to the following schedule.

Schedule for the sessions from Monday to Friday on flow day D+1:

1. MGP
   1. Preliminary information: 09:30
   2. Closing of the sitting: 11:00
   3. Results: 12:00
2. IDA1
   1. Closing of the sitting: 14:00
   2. Results: 14:30
3. FCR Results
   1. Margin flows and feasibility intervals as a result of the FCR: 15:30
4. MSD1
   1. Closing of the sitting: 16:00
   2. Results: 18:00

Additional details about the test procedure and schedule will be posted on the homepage of GME’s test platform, available at https://proveipex.ipex.it.

The web addresses of the platforms are as follows:

IPEX Interface: https://proveipex.ipex.it

MGP Web Service: https://proveipex.ipex.it/EuWs/service.asmx

MSD Web Service: https://proveipex.ipex.it/EuWsMSD/service.asmx

XBID Platform: https://provelts-pn.ipex.it/LTSWeb

XBID API: https://provelts-pn.ipex.it/LTSWebAPI/swagger/index.html

Nomination Platform: https://provens.ipex.it/NsWeb/home

Nomination Platform Web Service: https://provens.ipex.it/NSWs/Service.asmx

All market participants wishing to take part in the tests may access the test platforms by using the same credentials as those for access to the live platforms.

For any queries concerning the tests and the operation of the platforms, please write to GME at the following e-mail address: proveME@mercatoelettrico.org.

Please note that the data entered by market participants during the blank tests will not be used for operational purposes.

Following the news published on 20 March 2026, Participants are hereby informed that, following the merger between Banca Popolare di Sondrio S.p.A. and BPER Banca S.p.A., as of today April 20^th, 2026, BPER Banca S.p.A. will take over Banca Popolare di Sondrio S.p.A. as the institution selected for GME’s treasury services.

Hence, in order to ensure the correct process of payments and posting of cash deposits on GME’s markets and platforms, the new bank account details, available on GME’s website, are as follows:

BPER Banca S.p.A.

Payment of fees due on MTEE, RTEE, P-GO, MCIC and the PCEIBAN: IT55M0538703231000049347903SWIFT: BPMOIT22XXX

Payment of the amount due for the transactions concluded on ME, PCE, MLF and MGAS as well as payment for fees due on ME, MGAS, PGAS and MLFIBAN: IT32N0538703231000049347904SWIFT: BPMOIT22XXX

Cash deposit posted on ME, PCE e MGASIBAN: IT09O0538703231000049347905SWIFT: BPMOIT22XXX

Cash deposit posted and the payment of the amount due to the net creditors on MTEEIBAN: IT83P0538703231000049347906SWIFT: BPMOIT22XXX

Cash deposit posted on P-GO and the payment of the amount due to the net creditors on M-GOIBAN: IT37R0538703231000049347908SWIFT: BPMOIT22XXX

Cash deposit posted and the payment of the amount due to the net creditors on MCICIBAN: IT44I0538703231000049347910SWIFT: BPMOIT22XXX

As far as the submission of bank guarantees and/or related updates is concerned, the address of the bank in charge of GME's treasury services, available on GME’s website, is as follows:

SWIFT Code for sending the swift 799 message: BPMOIT22XXX

1. for the submission of documents in original with handwritten signature

BPER Banca S.p.A.Viale Cesare Pavese 336, 00144 - RomaTo the Attn.: Ufficio Key Client Large Corporate

1. for the submission of documents issued and signed digitally

BPER PEC: keyclientGME.bper@pec.gruppobper.it

Please also be informed that, together with the abovementioned changes, the new versions of the TEE, GO, and CIC Technical Rules, adapted accordingly, enter into force today with their publication on GME’s website, as indicated below.

1. DTF 01 MTEE
2. DTF 03 P-GO
3. DTF 03 MCIC

The updated versions of the Technical Rule n. 01 MTEE, 03 P-GO e 03 MCIC (i.e. DTF n. 01 Rev. 06 MTEE, DTF n. 03 Rev. 05 P-GO e DTF n. 03 Rev. 04 MCIC) replace the previous versions published on GME’s website.

For any further information, please contact us at mesettlement@mercatoelettrico.org.

GME informs market participants that, as of today, the option that is available in the Electricity Market Information System (SIME) and that enables market participants, in the cases referred to in the Integrated Text of the Electricity Market Rules, to enter data about the margins of the units that they have available will be extended also to holders of units “delegated” by the relevant BRPs.

Hence, as of today, with the publication on GME’s website, the updated version of Technical Rule no. 08 MPE (Technical Rule no. 08 rev. 5 MPE, “Methods for calculating the margins for the purposes of the MGP and MI by GME in the event of non-receipt”), will also enter into force.

Starting from 15 October 2025, GME will make available a new channel for accessing its market data (published in the “Results” section of its website www.mercatoelettrico.org): an API (Application Programming Interface) Service.

The new channel will initially operate alongside the current FTPS channel, which will remain active during for a further transitional period only for already registered users.

The final decommissioning of the FTPS channel will be announced well in advance to allow interested users, already registered with the FTPS, to migrate to the new system in a gradual and smooth way.

To request authorisation for data access via the API Service, the applicant must submit the documents listed at the following link, in accordance with the procedures and within the timeframes indicated in the API User Manual.

All interested users are invited to consult the API Service access procedure and related technical documents, available at this link.

For queries about the authorisation procedure, please contact SupportoAPI@mercatoelettrico.org.

To receive technical-IT support, please contact Sistemi@mercatoelettrico.org.

Following some reports received by telephone and email to Gestore dei Mercati Energetici S.p.A. ("GME"), it seems that these telephone calls are made by a supposed "GME Office" and/or so-called GME operators, regarding proposals to change the electricity and/or gas supplier due to increases in cost of energy, not properly specified, or problems in the current supply, which were followed, in some cases, by emails with similar content.

It should be remembered that GME is completely unrelated to the event mentioned above. We would like to clearly state that we do not provide, in any way, commercial services such as those described above. Furthermore, we do not use communication methods with our clients such as those outlined above.

When in doubt, we always suggest to make sure of the above by contacting your current electricity and/or gas supplier according to the contact methods made available by the same. In any case, we suggest to avoid any possible follow up about proposals such as those highlighted above, in order not to face any unpleasant inconveniences.