How to Register on Greece's Central Digital Procurement Platform and Get Your Unique Supplier Identifier (2026)

Supplier registration in Greece has become a pressing compliance priority for every business that wants to bid on, or win, a Greek public contract in 2026. The country’s e-procurement infrastructure, centred on the Promitheus platform, now requires bidders to hold a verified account and, at the award stage, to provide a unique supplier identifier to the contracting authority. Whether you are a Greek company with an existing AFM, an EU‑based supplier entering the market for the first time, or a third‑country contractor bidding on a defence or energy project, the registration workflow and document requirements differ significantly.

This guide walks through every step, from opening a Promitheus account to sharing your identifier after contract award, and explains how the process connects to Greece’s B2G e‑invoicing obligations under the myDATA framework.

Quick Summary, Who Must Register and Why It Matters

Any economic operator that intends to participate in a Greek public procurement procedure conducted through the national e-procurement system must hold an active, verified supplier account on Promitheus. While procurement registration in Greece is not always a pre‑condition for submitting an expression of interest, it is a mandatory requirement for electronic bid submission above the EU thresholds, and the unique supplier identifier must be available at the point of contract award.

Industry observers expect the practical effect to be straightforward: bidders who delay registration risk being unable to submit compliant tenders or, worse, losing an award because verification was not completed in time. The recommended approach is to register well before you need to bid. The TL;DR checklist for any supplier considering a Greek public tender is as follows:

• Obtain an AFM. Greek tax identification number, essential for all supplier types. (See our guide on how to get an AFM in Greece.)
• Prepare corporate documents. Company registry extract (GEMI for Greek entities), articles of association, authorised signatory details, and VAT certificate.
• Register on Promitheus. Create a user account, link your company, upload documents, and submit for verification.
• Retrieve your unique supplier identifier. Once verified, your identifier is generated and must be shared with contracting authorities at award.
• Set up B2G e‑invoicing. Connect to myDATA and ensure your invoices carry the required MARK authentication code.

What Is Greece’s Central Digital Procurement Platform (Promitheus / NEPPS / ESIDIS)?

The term “central digital platform” is used in several jurisdictions, notably the United Kingdom introduced its own Central Digital Platform under the Procurement Act 2023, which went live in phases from April 2026. In Greece, however, the equivalent system is the National Electronic Public Procurement System (NEPPS), universally known by its brand name Promitheus. Operated under the supervision of the General Secretariat of Commerce and Consumer Protection, Promitheus is the authoritative portal for e-procurement in Greece and handles everything from tender publication to electronic bid submission and contract management.

Understanding the platform architecture is important because bidders often encounter multiple sub‑system names. Promitheus is the umbrella; within it, specific modules handle distinct functions. For the purposes of supplier registration in Greece, the relevant module is ESIDIS (the electronic tendering sub‑system), through which bids are submitted and supplier profiles are managed.

Promitheus vs NEPPS vs ESIDIS, A Short Glossary

• NEPPS (Εθνικό Σύστημα Ηλεκτρονικών Δημοσίων Συμβάσεων). The formal legal name of the national e‑procurement system, established under Greek law transposing EU Directives 2014/24/EU and 2014/25/EU.
• Promitheus (Προμηθεύς). The operational brand and web portal at portal.eprocurement.gov.gr. All supplier registration, tender searches, and bid submissions happen here.
• ESIDIS (ΕΣΗΔΗΣ). The Electronic System for Public Procurement, the specific tendering sub‑system within Promitheus where suppliers interact with live procurement procedures.
• KIMDIS (ΚΗΜΔΗΣ). The Central Electronic Public Contracts Registry, used primarily by contracting authorities for publication obligations rather than by suppliers.

EU procurement rules continue to apply in Greece. The Greek procurement framework implements Directives 2014/24/EU and 2014/25/EU, and all above‑threshold procedures must comply with EU notification, standstill, and remedies requirements alongside the domestic Promitheus workflow.

Who Needs a Unique Supplier Identifier in Greece, Categories and Edge Cases

The unique supplier identifier is the system‑generated reference that links a verified supplier profile on Promitheus to a specific procurement procedure and, ultimately, to the awarded contract. Every economic operator that wins a public contract must hold one. The table below breaks down the obligation by entity type.

Edge cases include joint ventures (where each consortium member must be individually registered), sub‑contractors who may need registration depending on the tender rules, and suppliers participating in framework agreements, where the identifier is typically required when a call‑off results in a binding contract. Public‑private partnership (PPP) concessionaires are also subject to Promitheus registration obligations for the procurement elements of PPP procedures.

Before You Start, Documents, Tax and Identity Checks

A significant proportion of registration delays stem from incomplete or incorrectly formatted supporting documents. Before you access the Promitheus portal, assemble the following items. The exact requirements differ slightly for Greek, EU, and third‑country suppliers, but the core package is consistent.

• AFM (Αριθμός Φορολογικού Μητρώου). Your Greek tax identification number. Foreign suppliers without an existing AFM must apply through the local tax office (DOY) for non‑residents. Our step‑by‑step guide on how to get an AFM in Greece covers the process in detail.
• TaxisNet credentials. These are the online tax‑system login credentials issued by the Independent Authority for Public Revenue (AADE). Greek entities already have them; foreign entities obtain them after AFM registration.
• Company registry extract. For Greek entities, this is a current extract from GEMI (General Commercial Registry). EU suppliers should provide the equivalent national registry certificate (e.g., Companies House extract, Handelsregister, etc.).
• Articles of association / certificate of incorporation. A certified copy, ideally with an apostille or consular legalisation for third‑country entities, and an official Greek translation by a certified translator.
• Authorised signatory documentation. Board resolution or equivalent corporate authority document confirming who is authorised to submit tenders and sign contracts on behalf of the entity.
• Power of attorney (if applicable). Foreign suppliers often appoint a Greek‑based representative or legal adviser to handle Promitheus registration and bid submissions. The POA must be notarised and, for third‑country entities, apostilled.
• VAT registration certificate. For EU suppliers, the EU VAT number is sufficient. Third‑country suppliers may need to provide their domestic tax registration equivalent.
• Criminal record clearance. Some procurement procedures require confirmation that directors and key personnel have no relevant criminal convictions. See our guide on how to get police clearance in Greece for the process.

For anyone establishing a broader commercial presence alongside the procurement registration, how to start a business in Greece as a foreigner covers company formation, tax, and regulatory prerequisites. Suppliers who have previously completed a general supplier registration process in other jurisdictions will find the Greek workflow conceptually similar but operationally distinct.

Supplier Registration in Greece: Step‑by‑Step for Greek Suppliers on Promitheus

The domestic registration path on Promitheus is the most streamlined option, designed for Greek entities that already hold an AFM and TaxisNet credentials. The process is conducted entirely online through the Promitheus portal.

Step 1, Create a Personal User Account

Navigate to the Promitheus portal at portal.eprocurement.gov.gr and select the supplier registration option. You will be prompted to create a personal user account using your TaxisNet credentials for identity verification. This step authenticates the individual who will administer the supplier profile. Complete the personal details form, name, contact details, national ID or passport number, and set a secure password.

Step 2, Register Your Company and Assign the Company Administrator

Once your personal account is verified, you can link your company to the platform. Enter the company’s AFM, legal name as it appears in GEMI, and principal business address. The system will cross‑reference the AFM against the AADE (tax authority) database. Designate the company administrator, typically the legal representative or an authorised officer, who will manage all procurement activity on behalf of the entity.

Step 3, Upload Supporting Documents

Upload the documents listed in the preparation checklist above. The Promitheus portal accepts PDF format, and each document category has a dedicated upload field. Ensure that the GEMI extract is current (generally issued within the preceding three months) and that the authorised signatory documentation matches the details entered in the company profile. Missing or expired documents are the single most common cause of verification failure.

Step 4, Submit for Verification and Await Confirmation

After uploading, submit the profile for verification. The Promitheus support team reviews the submission, cross‑checks the AFM, and validates the uploaded documents. For Greek companies with complete and correctly formatted submissions, verification typically takes between one and five working days. You will receive an email notification when your profile is approved, or a rejection notice specifying which documents need correction.

Once verified, your account is fully active. You can search for published tenders, download tender documents, and submit electronic bids through ESIDIS. Your unique supplier identifier is generated upon verification and is visible in your account dashboard.

If you encounter issues during registration, the Promitheus helpdesk can be reached at support@eprocurement.gov.gr. Response times vary, but escalation is possible through the contact details published on the official gov.gr public contracts guidance page.

Step‑by‑Step: How to Register on Promitheus as a Foreign or Third‑Country Supplier

Foreign suppliers, whether based in the EU or in a third country, follow a dedicated registration path on Promitheus. The platform provides a specific foreigner registration interface accessible at the portal’s foreign registration endpoint. If the direct URL is unavailable or returns a session error, contact support@eprocurement.gov.gr to request the current live link.

Step 1, Access the Foreigner Registration Form

From the Promitheus portal homepage, locate the foreigner registration section. EU suppliers and third‑country (non‑EU) suppliers are routed through slightly different paths. EU suppliers with a valid EU VAT number will enter their VAT identifier, which the system cross‑references against the VIES database. Third‑country suppliers without an EU VAT number must provide their domestic tax identification and may be prompted to supply additional verification documentation.

Step 2, Complete the Entity Details

Enter the legal name of your entity exactly as it appears on the certificate of incorporation. Select the correct country code from the drop‑down menu, an apparently minor step that generates a disproportionate number of errors when suppliers select the wrong jurisdiction or use abbreviated names. Enter the registered office address, contact details, and the name and role of the authorised representative.

Step 3, Upload Translated and Apostilled Documents

Foreign suppliers must upload the same core documents as Greek suppliers, with two additional requirements. First, all documents not in Greek must be accompanied by a certified Greek translation. Second, documents originating from countries that are parties to the Hague Apostille Convention must carry an apostille; documents from non‑Convention countries require consular legalisation through the Greek consulate in the supplier’s home country. Common uploads include the certificate of incorporation (with apostille), a board resolution appointing the signatory, and a notarised power of attorney if a Greek representative will manage the account.

Step 4, Identity Verification and Manual Review

Unlike the largely automated verification for Greek suppliers, foreign registrations undergo a manual review. The Promitheus team may request additional clarification, for example, confirmation that the entity is authorised to trade in Greece, or verification of the signatory’s identity through a video call or notarised ID copy. This manual step is where most delays occur. EU suppliers can generally expect verification within five to fifteen working days. Third‑country suppliers should allow ten to thirty working days, and bidders targeting a specific tender should begin the registration process at least six weeks before the submission deadline.

Step 5, Account Activation and Identifier Generation

Upon successful verification, the foreign supplier’s account is activated and the unique supplier identifier is generated. The identifier functions identically to the one assigned to Greek entities and must be provided to the contracting authority at the contract‑award stage. Foreign suppliers should note their identifier and store it securely alongside their Promitheus login credentials.

Getting Your Unique Supplier Identifier, What It Looks Like and How to Share It

The unique supplier identifier in Greece is a system‑generated alphanumeric reference tied to your verified Promitheus profile. It is not a public‑facing number like a VAT registration; rather, it serves as an internal reference within the e-procurement ecosystem that links your entity to specific procurement procedures and awarded contracts.

You can retrieve your identifier at any time by logging into your Promitheus account and navigating to the profile or dashboard section. When a contracting authority notifies you of a contract award, you will typically be asked to confirm your identifier as part of the award‑stage documentation. Some contracting authorities include the identifier field in their own award notification templates; others expect the supplier to provide it proactively.

A practical tip for bidders: prepare a standard email template that includes your entity name, AFM, Promitheus registration number, and unique supplier identifier. Send this to the contracting authority promptly upon receiving the award notification. Delays in providing the identifier can hold up contract execution and, in some cases, trigger questions about the supplier’s readiness to perform.

Below‑Threshold Contracts and Framework Agreements, Specific Rules

Below‑threshold supplier registration requirements in Greece depend on the specific procurement procedure used by the contracting authority. For contracts below the EU thresholds, Greek law permits simplified procedures that may not require full Promitheus registration at the bidding stage. However, early indications suggest that contracting authorities increasingly require Promitheus registration even for below‑threshold procedures, particularly where electronic bid submission is mandated.

For framework agreements, the registration obligation typically crystallises at the point of call‑off award rather than at the framework establishment stage. That said, bidders who are not registered on Promitheus may be unable to participate in electronic call‑off competitions, effectively excluding them from the framework despite being named as a framework participant. The safest approach is to treat Promitheus registration as a universal prerequisite for any interaction with Greek public procurement.

Where a specific tender notice states that procurement registration in Greece is not required for bid submission, bidders should still verify whether the identifier will be needed at award. Failing to hold a verified account at that stage can create a time‑critical problem that risks losing the contract.

B2G E‑Invoicing, myDATA and Payment Readiness, Immediate Next Steps

Completing supplier registration on Promitheus is only the first part of the compliance picture. Once you win a public contract, you must be able to issue electronic invoices that comply with Greece’s B2G e‑invoicing requirements under the myDATA (my Digital Accounting and Tax Application) framework administered by AADE.

How Promitheus and myDATA Interact

Promitheus handles the procurement lifecycle, from tender to award. myDATA handles the financial lifecycle, from invoice issuance to tax reporting. The two systems are interconnected: contracting authorities receiving invoices from suppliers expect those invoices to carry a valid MARK (Μοναδικός Αριθμός Καταχώρησης, or unique registration number) issued by the myDATA platform, which authenticates the invoice and transmits it to the AADE tax database in real time.

Greece is aligned with the European Peppol BIS standard for B2G e‑invoicing. Suppliers must ensure that their invoicing software or Peppol Access Point provider can generate invoices in the UBL 2.1 or CII format, include the mandatory Greek fields (including the MARK), and transmit them through the Peppol network to the contracting authority’s receiving Access Point. AADE’s published guidance for B2G suppliers and certified Peppol providers sets out the technical specifications in detail.

Vendor Checklist for B2G E‑Invoicing in Greece

• Register on myDATA. If you have not already done so, register your entity on the AADE myDATA platform using your TaxisNet credentials.
• Connect to a certified Peppol Access Point. Select a provider certified for the Greek Peppol network. The EU Digital Building Blocks eInvoicing country factsheet for Greece lists the current interoperability standards and participating providers.
• Configure MARK generation. Ensure your invoicing workflow generates a MARK for every B2G invoice before transmission. Invoices without a valid MARK will be rejected by the contracting authority.
• Test the end‑to‑end flow. Before your first contract payment is due, run a test invoice through the full chain, from your ERP or invoicing tool, through the Peppol Access Point, to the contracting authority, and confirm that the MARK is correctly applied and visible.

Common Errors, Troubleshooting and Support Contacts

Registration rejections on Promitheus most frequently result from a small set of avoidable errors. Knowing these in advance can save weeks of delay.

• Expired GEMI extract. The company registry certificate must be current. Submitting an extract that is more than three months old triggers an automatic rejection.
• Mismatch between AFM and entity name. The legal name entered on the registration form must match the name held by AADE against the AFM exactly, including accents and legal‑form abbreviations (e.g., Α.Ε., Ε.Π.Ε.).
• Missing or incorrect apostille. For foreign documents, an apostille from the wrong country or an apostille that does not correspond to the specific document attached will be flagged.
• Unsigned or undated power of attorney. The POA must be executed, dated, and notarised. Draft or unsigned versions are rejected.
• Wrong country code selection. Foreign suppliers selecting the incorrect country code from the drop‑down menu create a profile mismatch that requires manual correction by the support team.

For escalation, contact the Promitheus helpdesk at support@eprocurement.gov.gr. If you do not receive a response within five working days, the gov.gr public contracts guidance page provides alternative contact details for the General Secretariat of Commerce and Consumer Protection.

Practical Checklist and Next Steps

Use the following checklist to track your progress through supplier registration in Greece and post‑registration compliance:

• ☐ AFM obtained (or application submitted to DOY for non‑residents)
• ☐ TaxisNet credentials received and tested
• ☐ GEMI extract (or equivalent foreign registry certificate) obtained, dated within three months
• ☐ Articles of association / certificate of incorporation, certified, apostilled (if foreign), and translated into Greek
• ☐ Board resolution appointing authorised signatory, executed and uploaded
• ☐ Power of attorney (if using a Greek representative), notarised and apostilled
• ☐ Criminal record clearance obtained for key personnel (if required by tender)
• ☐ Promitheus personal user account created and verified
• ☐ Company profile registered and linked to AFM on Promitheus
• ☐ All supporting documents uploaded in PDF format
• ☐ Profile submitted for verification, confirmation email received
• ☐ Unique supplier identifier retrieved and stored securely
• ☐ myDATA registration completed via AADE
• ☐ Peppol Access Point provider selected and contracted
• ☐ MARK generation configured and tested for B2G invoices
• ☐ Standard identifier‑sharing email template prepared for contracting authorities

For tailored advice on specific procurement procedures, complex consortium structures, or cross‑border registration challenges, consider consulting a specialist with experience in Greek public procurement. The Global Law Experts lawyer directory includes practitioners who advise on Greek tendering, PPPs, and regulatory compliance across energy, defence, and infrastructure sectors.

Sources

1. Promitheus / eProcurement Portal, Support and Registration (ESIDIS)
2. gov.gr, Public Contracts / Bidding Online Guidance
3. Independent Authority for Public Revenue (AADE), myDATA and B2G E‑Invoicing Guidance
4. EU Digital Building Blocks, eInvoicing Country Factsheet (Greece)