This group was active from 2021-2023 with the goal of advising the Agency on on REMIT policy matters, including compliance with the obligation on market participants to disclose inside information. The group also advised the Agency on other EU regulations impacting energy trading and market functioning regulation on energy markets, including financial market regulation and finally, on the REMIT Regulation more broadly in order to develop proposals for any future review.​

The REMIT expert group was composed of the following members (in alphabetical order):

• Mr Aviv Handler
• Mr Bernhard Walter
• Ms Camilla Berg
• Mr Cosimo Compidoglio
• Ms Giulia Migueles-Pereyra
• Mr Karl-Peter Horstmann
• Ms Ksenia Poplavskaya
• Mr Matti Sohlman
• Ms Nadja Keranen
• Mr Piotr Krawczak
• Mr Simon Dides
• Mr Nikolaj Nabo Andersen (observer for ENTSO-E)
• Mr Mark Csete (observer for ENTSO-E)
• Ms Kathrine Stannov (observer for ENTSOG)
• Ms Viktoria Medvedeva-Tšernobrivaja (observer for ENTSOG)
• Ms Violeta Sliskovic

The SO Regulation provides the rules and standards to ensure the required level of operational security, frequency, quality and efficient use of the interconnected system and resources. The SO Regulation entered into force on 14 September 2017. ​

Click here for information on the incident on the power system separation of Iberia from Continental Europe on 24 July 2021.

Click here for in​​​​​formation on the continental Europe electricity system separation (​8th January 2021) incident.​​

Click here for information on the incident in the Polish power system on 17 May 2021.

The SO Regulation applies to significant grid users that are further characterised as (new or existing):

• power generating modules classified as type B, C and D

• transmission connected demand facilities

• transmission connected closed distribution systems     

• demand facilities, closed distribution systems and third parties in case they provide demand response directly to the TSO

• high-voltage direct current (HVDC) systems, as well as,

• providers of redispatching of power generating modules or demand facilities by means of aggregation and providers of active power reserve.

The network code provides a minimum degree of harmonisation and leaves certain details to further implementation p​rocedures at regional level. This also applies to terms and conditions, as well as to methodologies, in connection to:

• key organisational requirements, roles and responsibilities related to data exchange and operational security

• methodology for building the common grid models

• methodology for coordinating operational security analysis.​​

The SO Regulation defines obligations for TSOs, regulatory authorities and ACER on the development and approval of terms and conditions and methodologies, as well as describing their adoption process. These rules contribute to ensuring security, facilitating the establishment and functioning of the Union's internal electricity market and the integration of renewable energy sources, as well as allowing a more efficient usage of the network and increasing competition for the benefit of consumers.

Terms and conditions and methodologies can be subject to the approval of:

• All regulatory authorities

• Regulatory authorities of a specific region

• Individually at the Member states' level

The TSOs' proposal should be consulted upon and submitted to the relevant regulatory authorities for approval. The proposal should contain a timescale for implementation and expected impact on the Regulation's objectives.

The NRAs involved should take decisions within six months after receiving the proposal. In case of disagreement, the regulatory authorities can request an amendment, allowing TSOs two more months for adjustments and additional two months for the regulatory authorities to approve the revised proposal. If the NRAs do not reach a unanimous agreement, or if they jointly request so, ACER can adopt a decision within six months from the referral.

Once the terms and conditions or methodologies are adopted, they can be amended after the request of the relevant TSO or NRA. In this case, the proposals for adjustments should be submitted for consultation and undergo a new approval procedure.

The implementation tabl​e​ provides more details on the latest updates.

Methodology for Coordinating Operational Security Analysis (CSAM)

The Coordinating Operational Security Analysis Methodology (CSAM) guarantees the safe execution of operational activities within the European Union's power system by outlining provisions and requirements for all Transmission System Operators (TSOs) and Regional Coordination Centres (RCCs) to:

• Facilitate effective coordination of system operation and operational planning.
• Ensure transparency and reliability of information regarding transmission system operation.
• Promote efficient operation of the electricity transmission system across the Union.

Approved CSAM

First ACER Decision​

On 19 June 2019 ACER adopted the first Decision No 07/2019 on CSAM. This Decision took into consideration inputs received in an ACER public consultation (which ran from 25 January until 18 February 2019).

This Decision allowed 18 months (i.e. until 18 December 2020) for TSOs to develop detailed rules to:

• Include remedial actions in individual grid models (Article 21).
• Coordinate cross-border relevant network elements (XNEs) and remedial actions (XRAs) in overlapping zones (Article 27).
• Share costs for XNEs and XRAs in overlapping zones (Inter-CCR) (Article 27).

In January 2023, ACER published a Corrigendum to correct a typographical error in Annex I of Decision No 07/2019.

Amendments to CSAM

First amendment: Following a public consultation (in summer 2020) organised by ENTSO-E (on behalf of all TSOs), ENTSO-E submitted a proposal to ACER to amend the CSAM in December 2020. In June 2021, with its Decision  No 07/2021, ACER amended the CSAM.

Second amendment: In early summer 2023, ENTSO-E (on behalf of all TSOs) ran a public consultation to consult on new amendments to CSAM. In November 2023, ENTSO-E submitted to ACER its proposal to amend the methodology.

ACER amended the CSAM on 13 May 2024 with its Decision No 07/2024.

Methodology for assessing the relevance of assets for outage coordination​

All TSOs must develop a proposal for a methodology at least per synchronous area, evaluating the relevance of outage coordination's assets (RAOCM) and submit it to all the regulatory authorities for approval and to ACER for information.

Action 1: In September 2018, all TSOs submitted the proposal for RAOCM to all the regulatory authorities and to ACER.

Action 2: In December 2018, all regulatory authorities requested ACER to adopt a decision on the Proposal.

Action 3: From 25 January to 18 February 2019 ACER conducted a formal public consultation in order to obtain a wider view from stakeholders.

Action 4: In Spring 2019, ACER engaged with TSOs and NRAs and informed them about the decision.

Action 5: In June 2019, ACER adopted a decision on the proposal for RAOCM.

The RAOCM is expected to be implemented within three months after ACER's decision.

Related documents

Approved proposal for coordinating operational security analysis​

Methodology for regional operational security coordination - CORE Region​

All CORE TSOs must develop a proposal for a methodology for regional operational security coordination (ROSC) and submit it to all CORE regulatory authorities for approval. The methodology should aim at the regional standardisation of operational security analysis for Austria, Belgium, Croatia, Czech Republic, France, Germany, Hungary, Luxembourg, Netherlands, Poland, Romania, Slovakia and Slovenia (the CORE region).

Action 1: In December 2019, all CORE TSOs submitted the proposal for the ROSC to all regulatory authorities.

Action 2: In June 2020, all CORE regulatory authorities requested ACER to adopt a decision on the proposal.

Action 3: In September 2020, ACER conducted a formal public consultation in order to obtain a wider view from stakeholders.

Action 4: From July to October 2020, ACER engaged with TSOs and NRAs and informed them about the decision.

Action 5: In December 2020, ACER adopted a decision on the Methodology for Regional Operational Security Coordination for the Core Capacity Calculation Region.

The ROSC is expected to be implemented in two steps. Find more details on these steps within the approved methodology.

Related documents

Approved Core ROSC

CORE TSOs' proposal

Explanatory document

RAs letter for referral ​​

Core ROSC​ Non-Paper​​

Methodology for regional operational security coordination - SEE Region

All SEE TSOs must develop a proposal for a methodology for regional operational security coordination (ROSC) and submit it to all SEE regulatory authorities for approval. The methodology should aim at the regional standardisation of operational security analysis for Bulgaria, Greece and Romania (the SEE region).

Action 1: In December 2019, all SEE TSOs submitted the proposal for the ROSC to all regulatory authorities.

Action 2: In October 2020, all SEE regulatory authorities requested ACER to adopt a decision on the proposal.

Action 3: In October 2020, ACER engaged with TSOs and NRAs and informed them about the decision.

Action 4: In December 2020, ACER adopted a decision on the Methodology for Regional Operational Security Coordination for the SEE Capacity Calculation Region.

The ROSC is expected to be implemented in two steps. Find more details on these steps within the approved methodology.

Related documents 

Approved SEE ROSC

SEE TSOs' proposal

RAs letter for referral

RAs Non​- Paper

With the adoption of its Greening Action Plan 2021-2022, ACER pledges to reduce its own carbon footprint as an organisation.

ACER’s desire to become greener and more digital as an organisation is not surprising for an EU Agency that plays such a pivotal role in the delivery of Europe’s ambition to be climate neutral by 2050.

Decarbonising the energy sector is a core pillar of the European Green Deal. Europe’s decarbonisation goals relies on integrated European energy markets. This lies at the heart of ACER’s work. Safe and sustainable energy is in turn a key enabler of a competitive and climate-neutral EU economy.

What’s in the ACER Greening Action Plan 2021-2022?

ACER has adopted its first Greening Action Plan identifying 17 concrete actions that aim to reduce the Agency’s carbon footprint in the course of 2021 and 2022, with a strong cross-departmental effort.

This commitment shows ACER’s readiness to implement concrete greening actions, and to support the efforts of its staff and members embracing innovation and sustainable ways of working.

ACER actions fall into six thematic action domains, inspired by the European Commission’s Feasibility and Scoping Study for the Commission to Become Climate Neutral by 2030:

• Design sustainable buildings and working space;
• Optimise energy consumption and systems for buildings;
• Reconsider air travel and promote sustainable travel modes;
• Reduce commuting emissions for transport and mobility;
• Reduce GreenHouse Gas (GHG) emissions from purchase and consumption;
• Manage and communicate for other sources of emissions.

The Agency was invited by its Administrative Board to prepare its first Greening Action Plan for 2021-2022.

ACER’s Greening Action Plan details the current state of play as well as the planned actions of the Agency factoring in the available resources.

Read more on the ACER Greening Action Plan (2021-2022).