Today, ACER publishes its report on trends in the European gas wholesale markets during the gas winter season (October 2024 to March 2025). The report also explores gas storage dynamics over the winter and offers an outlook for summer 2025. 

What trends did ACER monitoring find? 

European gas markets came under more pressure this winter due to higher demand and lower supply.

• Wholesale prices increased by 50% compared to last winter, though regional price variations narrowed.
• Gas consumption increased year-on-year, driven by colder weather than in the past two winters and exceptionally low wind generation. 
• Despite increased demand and the halt of Russian gas flows via Ukraine, gas networks avoided congestion thanks to full storages at the start of winter, expanded LNG infrastructure, and gas consumption remaining structurally lower than pre-crisis levels.
• Storage levels ended winter at 34% capacity, in line with pre-2022 norms but well below 2023-2024 levels. Significant injections will be needed before next winter.
• LNG imports rose seasonally but stayed below early winter 2023 levels. Later in the season, with European gas wholesale prices exceeding Asian spot LNG prices and new US liquification coming online, EU LNG imports hit record monthly highs.

Looking ahead 

To meet summer 2025 gas needs and refill EU gas storage to 90% by next winter, ACER estimates that pipeline flows must remain high and LNG imports will need to increase by 20% compared to summer 2024. 

Today, ACER publishes its report on the Czech gas transmission tariffs directed at the Energetický regulační úřad/Energy Regulatory Office (ERO), the Czech national regulatory authority.

The report assesses whether the proposed reference price methodology complies with the requirements of the EU binding Network Code on Harmonised Transmission Tariff structures. 

What is the proposed tariff methodology about?

The regulator proposes to:

• Adopt a capacity weighted distance methodology as the reference price methodology.
• Adjust the entry-exit split from the current 9-91% to 15-85%. 
• Reduce the discount applied to entry and exit points of storage facilities from 100% to 80%.

What are the key findings? 

After analysing the consultation document, ACER concludes that:

• The proposed methodology largely complies with the requirements of the network code.
• Most required information is provided, with the exception of the calculation and components of the cost allocation assessment. 
• The proposed commodity-based charge generally aligns with Article 4(3) of the tariff network code (which sets the rules for commodity-based tariffs). 

What does ACER recommend? 

ACER recommends that the national regulatory authority (ERO), when adopting its final decision:

• Consults on any benchmarking adjustments, respecting the two-month consultation period set in the tariff network code. If this timeframe cannot be met, ACER recommends that ERO provides the longest possible consultation period, anticipating the opening and closing dates to stakeholders and ACER.
• Justifies the results of the cost allocation assessment, providing an explanation on how the outcomes vary when different assumptions are used. This should help identify the most suitable methodologies for the transmission network.
• Justifies the use of an alternative pricing mechanism for the flow-based charge at interconnection points. For this purpose, ERO should demonstrate that there is a significant risk of volatility in cross-system flows that could impact the cost reflectivity of the flow-based charge.

See all ACER reports on national tariff consultation documents.

Today, ACER releases its report on the Lithuanian gas transmission tariffs directed at the Valstybinė Energetikos Reguliavimo Taryba (VERT), the national regulatory authority (NRA) of Lithuania.

The report assesses the compliance of the proposed reference price methodology (RPM) with the requirements of the Network Code on Harmonised Transmission Tariff structures. 

What is the proposed methodology about?

The Lithuanian regulator proposes to:

• Apply a postage stamp reference price methodology with flexible entry-exit splits, complemented by a 100% discount at entry points for domestic biomethane producers.
• Align entry tariffs with those of the neighbouring FinEstLat (Finland, Estonia and Latvia) zone.
• Simplify the existing tariff structure by abandoning the previously applied system based on multiple asset cost splits and differentiated tariffs.
• Use a flow-based charge (commodity-based tariff) with a fixed tariff level for the entire regulatory period.
• Offer a conditional product with limited allocability (i.e. the product can only be used to ship gas to pre-defined system points) at entry and exit points with non-EU countries.

What are the key findings? 

After analysing the consultation document, ACER concludes that:

• The proposed methodology meets the requirements on transparency, non-discrimination, and volume risk.
• Compliance with the requirements on cost-reflectivity, avoidance of cross-subsidisation, and prevention of cross-border trade distortions cannot be fully assessed, due to several design elements of the methodology.
• While the criteria for setting the flow-based charge are met, further clarification is needed on how the charge will be adjusted and reconciled. 
• Simplifying the tariff structure has made the methodology more understandable for system users.

What does ACER recommend? 

ACER recommends that the national regulator, when adopting its final decision:

• Provides a clear framework for the flow-based charge, preferably by recalculating its level annually.
• Ensures full compliance of non-EU entry and exit points with the network code. 
• Assesses regional networks and allocates their costs in a compliant way, in line with EU rules and ACER’s guidance.

See all ACER reports on national tariff consultation documents. 

The ACER report Unlocking flexibility: No-regret actions to remove barriers to demand response identifies persistent barriers to demand response and proposes 12 no-regret actions to remove them. 

The report is a roadmap and a call to action for policymakers, system operators, regulators, and market participants to act now. These actions will enhance flexibility, improve system efficiency, reduce consumer costs, and support the energy transition.

What are flexibility and demand-response?

Demand is the consumer side of the electricity market. Demand response is when consumers (or aggregators on their behalf) adjust their electricity consumption and generation in response to a change in the electricity market price (or a financial incentive) to increase/decrease/shift the timing of their electricity consumption. 

Power system flexibility is the electricity system’s ability to adjust to changing generation, consumption and grid conditions. Distributed energy resources, including demand response, energy storage, and distributed generation, play a key role in providing this flexibility.

Demand response supports more variable renewable generation and demand-side resources being added to the power grid. When consumers respond to price signals and actively participate in electricity markets, the benefits extend beyond them, helping to reduce price volatility for all consumers.

How is unlocking demand response linked to energy bills and the clean energy transition? 

Consumers have an important role to play in energy markets and the shift to cleaner energy. Enabling demand response supports this transition.

Recognising this, the first action of the European Commission’s Action Plan for Affordable Energy (February 2025) is to make electricity prices more affordable. 

One way to achieve this is by increasing flexibility in the power system. Greater demand response helps reduce price volatility and price spikes, makes it easier to integrate renewables, and increases overall system resilience.

What are ACER’s recommendations?

The ACER report sets out 12 concrete actions to remove the barriers to demand response, calling, for example, for:

• Stronger price signals through dynamic pricing and time-of-use tariffs to encourage consumer participation.
• Simplified market entry allowing aggregators and small players to provide flexibility services.
• Wider adoption of smart meters to enable real-time demand response.

ACER and the national regulatory authorities (NRAs) agree to follow the actions set out in the report and call on policymakers, Member States, system operators, and market players to similarly focus on these 12 actions.

Read more.

Today, ACER releases its report on the German gas transmission tariffs directed at the Bundesnetzagentur für Elektrizität, Gas, Telekommunikation, Post und Eisenbahnen (BNetzA), the national regulatory authority (NRA) of Germany.

The report assesses the compliance of the proposed reference price methodology (RPM) with the requirements of the Network Code on Harmonised Transmission Tariff structures (NC TAR). 

What is the proposed RPM about?

The German NRA proposes to:

• Apply a postage stamp RPM with uniform entry and exit tariffs.
• Use conditional products with discounted tariffs.
• Use non-transmission services, including metering at exit points (for both end-users and distribution networks) and alternative nomination procedures for gas deliveries.

What are the key findings? 

After analysing the consultation document, ACER concludes that: 

• The RPM complies with the requirements of the network code on transparency, non-discrimination and volume risk.
• Due to insufficient information on regional networks, ACER could not assess the compliance of the proposed tariffs with the principles of cost-reflectivity, avoidance of cross-subsidisation and prevention of cross-border trade distortions. 
• While the criteria for setting metering charges are met, ACER could not assess whether the proposed tariff methodologies for alternative nomination procedures comply with NC TAR principles.

What does ACER recommend? 

ACER recommends that the NRA, when adopting its final decision:

• Assess regional networks and allocate their costs in a compliant way, in line with EU rules and ACER’s guidance.
• Provide more clarity on how discounted tariffs for conditional products are calculated.

See all ACER reports on national tariff consultation documents. 

On 27 March 2025, ACER received the transmission system operators’ (TSOs’) proposal to amend the Harmonised Allocation Rules (HAR) for long-term electricity transmission rights.

To inform its decision-making process, ACER will open a public consultation on 24 April 2025.

Why change the rules?

The harmonised allocation rules apply to all long-term transmission rights allocations conducted within the European Union. They provide specifications for the auctioning of long-term transmission rights (including use and curtailment of long-term transmission rights, eligibility criteria, etc.) and go through a review process every two years. 

The TSOs’ proposal updates various elements of the HAR related to arrangements with market participants to consider upcoming market changes (e.g. introduction of 15 minutes market time unit in day-ahead) and recent incidents (e.g. single-day ahead market decoupling in June 2024).

What are the next steps? 

The public consultation will run until 22 May 2025. 

ACER will decide on this amendment by 29 September 2025. 

The Regulation on Wholesale Energy Market Integrity and Transparency (REMIT) is the EU framework that aims to prevent wholesale energy market abuse and support fair competition. The regulation was amended in 2024 to ensure the regulatory framework keeps pace with evolving market dynamics.

Now, ACER has updated its Questions & Answers (Q&As) on REMIT to incorporate the changes introduced in the amended regulation. 

The Q&A document (first published in 2011) summarises frequently asked questions about REMIT and their answers. It provides market participants and other stakeholders with information on REMIT definitions, market participant obligations, transaction reporting, and more.

What’s new in the updated Q&As?

This 30^th edition aims to align the document’s legal references with the revised regulation and clarify key concepts, including:

• new obligations for third-country market participants;

• order book reporting by organised marketplaces; and

• the expansion of REMIT’s scope to include new products (such as energy storage and hydrogen). 

The revised Q&As provide clearer explanations of reporting and compliance aspects, helping market participants to better understand the new requirements.

For additional questions about REMIT implementation and data reporting, stakeholders are encouraged to:

• check ACER guidance documents; or

• submit their queries via the REMIT query form.