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This page gives you quick access to the registers, data standards and reporting services you may need alongside GEN. All links open external websites that are owned and maintained by the respective organisations.

Market participant registers

Resource	What you can do
ACER – European Register of Market Participants	Look up market participants registered under REMIT in the EU, including their ACER codes
Ofgem – GB REMIT Registration Database (public version)	Look up market participants registered under GB REMIT

Identification codes

Resource	What you can do
GLEIF – LEI Search	Look up or verify a counterparty's Legal Entity Identifier (LEI)
ENTSO-E – EIC Code Lists	Find approved Energy Identification Codes (EIC) and check a code with the check digit calculator
ENTSOG – Approved EIC Codes	Find EIC codes approved for the gas market

REMIT reporting

Resource	What you can do
ACER – REMIT Portal (ARIS)	Access ACER's REMIT Information System, notices and registers
ACER – Transaction Reporting User Manual (TRUM)	Check how each field of a REMIT transaction report should be filled in
ACER – Q&As on REMIT	Find ACER's answers to common REMIT questions
ACER – FAQs on fundamental data and inside information	Find guidance on reporting fundamental data and publishing inside information

Data standards

Resource	What you can do
Energy Traders Europe – Data Standards Overview	Find the industry data standards used for trade confirmations and reporting

Trade repositories

Resource	What you can do
REGIS-TR	Access the trade repository used for regulatory transaction reporting

Good to know

These links are provided for convenience only. Fidectus is not responsible for the content of external websites.
For questions about how GEN supports your regulatory reporting, please contact our Support team. We're happy to help.
Missing a link, or found one that no longer works? Let us know and we'll update this page.

Last reviewed: October 2026