Last Update
13. May 2026
FAQ: Inside Information
Common questions on identifying and publishing inside information under REMIT.
ACER Inside Information Access Point Entry
The ACER Inside Information Access Portal is a central hub for EU energy market transparency, ensuring all critical events and changes in the wholesale energy market are reported, accessible, and monitored in accordance with REMIT rules. It reduces fragmentation by replacing multiple national publication points with one EU-wide system.
Definition & disclosure of inside information
What counts as “information”?
- Under REMIT, “information” also covers planned or unplanned changes in capacity or output at facilities related to production, storage, consumption, transmission, and LNG.
Inside information criteria
- Precise in nature
- Not publicly available
- Related to wholesale energy products
- Would significantly affect prices if public
Disclosure requirements
- ACER expects inside information to be disclosed through an Inside Information Platform (IIP).
- Publication on a website or social media can supplement but does not replace IIP disclosure.
How the Assets are determined?
- An Asset in the energy market refers to a physical or organizational unit involved in energy generation, storage, transmission, or distribution, such as power plants, solar farms, wind turbines, storage facilities, or network infrastructure.
- The EIC Code (Energy Identification Code) is a unique identifier assigned to each asset, such as a power plant or wind farm. This code ensures that the asset can be clearly identified and linked to relevant data for reporting and market transparency purposes. It includes the EIC W, T or Z code of the facility that is unavailable.
In case of an asset being unavailable (e.g., during an outage), the EIC Code of the affected asset must be identified at the most granular level. For example, if a production unit is made up of multiple sub-units, the EIC of the relevant sub-unit should be reported.
What is an EIC Code and what types exist?
- An EIC Code (Energy Identification Code) is a unique identifier used in the energy sector to clearly mark various participants and facilities in the energy market. The EIC code helps identify market participants, energy generation plants and transport systems.
- For asset identification, only the W, T and Z codes are allowed:
- W-Code
Used for generation units, such as power plants or wind farms. Identifies the energy source that produces electricity or other forms of energy. - T-Code
Used for transmission units that transport energy through networks, such as power lines or gas pipelines. - Z-Code
Used for other market participants, such as consumers or market platforms — also for non-functional entities that do not directly perform generation or transport functions.
- W-Code
When should the EIC code of an individual wind turbine be used, and when should the EIC code of the entire wind farm be used for reporting Inside Information?
- Use the individual wind turbine’s EIC code if the failure of that turbine significantly impacts the market (e.g. a high-capacity turbine).
- Use the entire wind farm’s EIC code if the failure affects the whole farm or its total generation capacity.
This applies when all turbines are affected, or the failure impacts total generation capacity, allowing for an aggregated report.
If I operate multiple solar parks, can I submit an aggregated report, or do I need to report each park separately?
- If you operate multiple solar parks, the general rule is that each individual solar park should be reported separately as a distinct Asset. Each solar park typically has its own EIC code, and reporting must be done for each park based on its specific data, such as availability, capacity, and any unavailability or inside information.
- However, if the individual parks do not have significant market relevance on their own, but the aggregated capacity of all the parks collectively has a market impact (for example, if the combined capacity of the solar parks is large enough to influence the market), you may choose to report the aggregated capacity as a single Virtual Power Plant (VPP) with a single EIC code.
In this case, the VPP can be treated as one asset for reporting purposes. This is particularly useful when the total capacity of the parks is market-relevant, but the individual parks do not individually affect the market.
Summary:
- Separate reporting is required for each solar park if each park has its own EIC code and is market-relevant.
- Aggregated reporting can be used if the combined capacity of the parks is market-relevant, and you can treat the group of parks as a single VPP asset with one EIC code.
See Question § 4.1.18 REMIT Frequently Asked Questions (FAQs): On REMIT fundamental data and inside information collection (V8 – 26 March 2026)
What is the Minimum Facility Capacity for Reporting Inside Information?
- ACER has not defined a specific minimum value in megawatts for when information about a facility must be reported. Instead, ACER provides general guidelines.
- The agency requires that information about a facility must be reported if it constitutes “Inside Information” – that is, if it could potentially have a significant impact on the prices of related wholesale energy products.
- However, ACER provides factors to consider when assessing the relevance of information, such as the size of the event, the market situation, and other relevant market variables. The responsibility for determining whether information must be reported lies with the market participant, who must assess the likelihood of a significant price movement based on the information.
For more information please see:
§3.3.4
Information is deemed to constitute inside information only if, were it made public, it would be likely to have a significant effect on the prices of related wholesale energy product. Based on the condition of a significant price effect, the Agency narrowed the wide notion of information down to the information that is crucial enough to have the potential to significantly affect the prices of wholesale energy products, and therefore to information that is relevant for trading.
The assessment of the likelihood of price effect has to be performed by a market participant on a case by-case basis.
The market participant should take into consideration the anticipated effect of the information in light of the nature of the information, as well as the specificities of the market and the market situation at the time of the assessment.
A non-exhaustive list of factors that are typically relevant for this assessment are provided below:
- the characteristics of the market (size, timeframe, market design, liquidity, type of participants etc.);
- the size of the event;
- the already published information on supply or demand situation;
- availability and unavailability of transmission facilities, storage or network constraints;
- the time of day (e.g. weekday/weekend, office hours/out of office hours);
- the existence of announcements on non-regular events (for example, the commissioning of new power plant, the re-commissioning of mothballed power plant, etc.);
- TSO announcements related to the system (imbalances, security of supply, technical constrains etc.); and
- any other market variables likely to affect the price of the related wholesale energy product in the given circumstances (e.g. weather conditions, CO2, fuel prices, news on political and geopolitical developments etc.).
What is the Minimum Facility Capacity for ACER REMIT Reporting?
Which Type of Event should be selected when reporting the unavailability of an electricity storage unit?
For electricity storage units, the Type of Event “Other unavailability” should be used.
This option applies when the standard values – ‘production’, ‘consumption’, or ‘transmission unavailability’ – do not accurately describe the event.
See FAQs on REMIT fundamental data and inside information V9, Question 5.1.4
Note: This FAQ collection has been compiled from various sources and reflects our understanding. It is provided for informational purposes only and is not legally binding. We do not take any legal responsibility for the accuracy or completeness of the information. For legal or regulatory matters, please consult a professional.