An EIC number, or Energy Identification Code, is a 16-character alphanumeric identifier used across the European electricity and gas markets to identify companies, power plants, transmission lines, metering points, and market zones involved in cross-border energy activity. The scheme is managed by the European Network of Transmission System Operators for Electricity (ENTSO-E) and exists so that electronic data exchange between market participants, grid operators, and regulators stays reliable across national borders.1ENTSO-e. Energy Identification Codes (EICs) If you trade wholesale energy in the EU, operate a generation asset, or fall under REMIT reporting duties, you need one.
What an EIC Number Looks Like
Every EIC follows the same fixed 16-character format, built for automated processing:2ENTSO-e. The Energy Identification Coding Scheme (EIC) Reference Manual Version 5.4
- Characters 1–2: the Local Issuing Office (LIO) that granted the code.
- Character 3: the object type, a single letter indicating what the code represents.
- Characters 4–15: a 12-character string of digits, uppercase letters, or minus signs that uniquely identifies the party or asset.
- Character 16: a check character calculated from the preceding 15 using a weighted modulo-37 algorithm, so data-entry errors are caught during electronic transmission.
An example: 11XRWENET12345-2. The “11” is the LIO, “X” flags it as a party (a legal entity), “RWENET12345-” is the unique identifier, and “2” is the check character. Once assigned, the 12-character identifier block does not change meaning over time.
Which Type of Code You Need
The object-type letter in position three tells the system what the code refers to. The one most applicants request is X, for a party — any legal entity active in the market, such as a trading company, supplier, or transmission operator. Other types cover areas and bidding zones (Y), generation and storage assets (W), measurement points (Z), substations (A), tielines (T), and physical locations (V).3ENTSO-e. ENTSO-E Code Lists A company operating multiple wind farms would hold one party code for itself and separate resource-object codes for each generation unit.
You also have to choose between an international and a local code. A company operating across multiple countries or market areas should apply for an international EIC; one international code is enough to participate across the entire European internal energy market. A company whose operations sit within a single area should apply for a local code instead. Codes for physical assets — generation units, substations, and the like — are currently only issued as local codes, even when the asset sits on a cross-border interconnection.4ENTSO-E. Energy Identification Coding (EIC) – Short Guide and FAQ Picking the wrong type on the form can force you to reapply.
Documents to Gather Before You Apply
An EIC is tied to a verified legal entity, so the LIO will ask for corporate identification. Expect to provide an excerpt of the national trading register together with a VAT identification number or another unique identifier such as a Legal Entity Identifier (LEI) or company registration number.5ENTSO-e. The Energy Identification Coding Scheme (EIC) Reference Manual Version 5.5 Under the scheme’s definitions, a “party” is a legal entity that holds one of these identifiers.
You also need your registered business address and contact details for a designated representative. Every field must match your official corporate registration exactly. Mismatches with tax authority records are among the most common reasons applications are rejected or delayed.
If two participants share the same VAT number, which some countries permit, one of the codes must be designated as the EIC Parent. Otherwise the second one will not be accepted.5ENTSO-e. The Energy Identification Coding Scheme (EIC) Reference Manual Version 5.5
How to Apply
Applications go to the Local Issuing Office responsible for the country where your entity is registered, or where the physical asset is located. ENTSO-E publishes a full list of LIOs with their websites and contact emails on the central EIC page.1ENTSO-e. Energy Identification Codes (EICs) If you cannot work out which office is the right one, questions can go to ENTSO-E’s Central Issuing Office at cio-admin@entsoe.eu.
The process is straightforward. Download the EIC request form from the relevant LIO’s website, complete it with your corporate details and specify the type of code you need (international or local, and the object category), then submit it by email or through the LIO’s online portal.6National Energy System Operator. LIO for EIC Codes The LIO validates your information against national trading registers. Once approved, the new code is published both on the LIO’s own website and in the Central Issuing Office’s registry, and you receive it by email. Processing times vary. Some offices turn applications around within days; others take longer when workloads are heavy.
One point that catches newcomers off guard: an EIC is purely an identification scheme. Holding one does not grant any right or authorization to trade energy.6National Energy System Operator. LIO for EIC Codes The licenses and market registrations required by your national regulator still apply separately.
Why Most Companies Need One: REMIT
The practical driver behind most EIC applications is the EU’s Regulation on Wholesale Energy Market Integrity and Transparency (REMIT). REMIT requires market participants to report trade data and fundamental data to the Agency for the Cooperation of Energy Regulators (ACER), and EIC codes are the standard identifiers used throughout those reports. All electronic formats for REMIT reporting in gas markets rely on EICs, and the codes serve as the primary identifier for market participants, network points, delivery zones, and reporting entities.7Europex. Wholesale Energy Market Integrity and Transparency (REMIT)
An EIC is mandatory for market participant registration under ACER Decision 1/2012. Failing to provide a valid type-X code during registration is itself a breach of REMIT Article 9.8ENTSOG. EICs and REMIT ACER’s data collection system, ARIS, validates incoming reports, and transaction reports containing inactive or unaccepted EICs are flagged as violations of the validation rules.9ACER. List of Accepted EICs ACER has warned that a single record with an inconsistent market participant identifier can cause the rejection of the entire report, not just the problematic line.
Penalties for REMIT breaches, including those linked to EIC failures, are set nationally, so the specific fine depends on the member state. The operational fallout can hit sooner than any regulator’s letter: if your reports are systematically rejected because of an invalid EIC, ACER and national regulators have no reference for whom the data belongs to, and untraceable trades are exactly the pattern REMIT surveillance is designed to flag.
Keeping the Code Active
An EIC has no routine expiration date and no periodic renewal requirement. It is designed to remain stable over time. What you are responsible for is telling your LIO whenever the information tied to the code changes — a company name change, a new registered address, a shift in corporate structure. The LIO is required to remind participants of this obligation.2ENTSO-e. The Energy Identification Coding Scheme (EIC) Reference Manual Version 5.4
Serious rule violations can trigger revocation. The LIO or CIO issues a written notice demanding a remedy within 30 calendar days. If the problem is not fixed, the code is suspended, and another 30 days without resolution leads to full revocation.2ENTSO-e. The Energy Identification Coding Scheme (EIC) Reference Manual Version 5.4 Losing an active EIC while you still have reporting obligations would put you in immediate breach of REMIT, which is why update requests and LIO correspondence are worth treating as high-priority mail.