How Greece's 2026 Public Procurement Reforms (law 5290/2026) Change Ppps, Unsolicited Proposals and Tender Disputes

The landscape of public procurement Greece has undergone its most significant overhaul in nearly a decade. Law 5290/2026, published in April 2026, restructures the rules governing unsolicited proposals, recalibrates the classification of public‑private partnerships (PPPs) and concessions, and modifies the remedies available to aggrieved bidders before Greece’s administrative courts. These domestic reforms land alongside the revised EU public procurement thresholds that took effect on 1 January 2026, together redrawing the line between contracts subject to full EU procurement directives and those governed solely by national rules. For procurement officers, in‑house and external counsel, PPP investors and bidders operating in Greece, the combined effect demands an immediate reassessment of tender strategy, bid‑challenge readiness and compliance architecture.

This guide explains what changed, who is affected, and, critically, what practitioners should do now. It covers:

• The substantive changes introduced by Law 5290/2026, scope, definitions and practical effects.
• Revised EU thresholds, a comparison table showing which contracts now fall under EU rules.
• Unsolicited proposals, the new step‑by‑step process for private parties and contracting authorities.
• PPPs, concessions and HRADF privatisation interactions.
• Promitheus / eProcurement compliance checklists for bidders.
• Remedies and tender dispute tactics, timelines, injunctive relief and litigation strategy.
• Compliance risk checklists for both sides of the procurement table.

1. What Changed: Law 5290/2026, Concise Legal Summary for Public Procurement Greece

Law 5290/2026 amends several core provisions of Greece’s public procurement framework, building on the earlier reform trajectory established by Law 5218/2025. Where the 2025 law began modernising Greece’s alignment with EU Directives 2014/24/EU and 2014/25/EU, the 2026 amendments go further by tackling three areas that generated persistent practical difficulties: the unsolicited‑proposals regime, the boundary between PPPs and standard public contracts, and the procedural rules for administrative review of award decisions.

1a. Scope and key definitions

The law applies to all contracting authorities within the meaning of the Greek transposition of the EU procurement directives, central government ministries, regional authorities, municipalities, public‑law bodies and utilities. Its three substantive pillars are:

• Unsolicited proposals. Law 5290/2026 introduces a dedicated statutory pathway through which private parties may propose projects to contracting authorities outside a formal tender process, subject to strict procedural safeguards.
• PPP classification. The amendments clarify the demarcation between concession contracts (governed by Directive 2014/23/EU) and PPP arrangements that include availability‑payment structures, resolving ambiguities that previously complicated financing and risk allocation.
• Remedies framework. The law adjusts filing deadlines and the procedural sequencing of pre‑contractual relief before the Administrative Courts of Appeal, responding to criticism that the prior timeline created perverse incentives for tactical delay.

1b. Key procedural changes for contracting authorities

Contracting authorities must now comply with enhanced transparency obligations when evaluating unsolicited proposals, including mandatory publication of receipt, evaluation criteria and outcome on the National Electronic Public Procurement System (ΕΣΗΔΗΣ). They must also apply a formal public‑interest test before any unsolicited proposal can progress to a competitive dialogue or negotiated procedure. Additionally, authorities procuring PPP contracts above the EU thresholds must classify the arrangement at the outset and maintain documentary evidence supporting that classification throughout the award process.

1c. Immediate practical effects

For bidders, the reforms create new opportunities (the unsolicited‑proposal channel) but also new compliance burdens. Early indications suggest that contracting authorities will scrutinise technical and financial feasibility documentation more rigorously, and that the enhanced remedies framework shortens the window for challenge preparation. Procurement officers should update their internal procedures, template documentation and delegation matrices before the next procurement cycle begins.

2. EU Public Procurement Thresholds, Which Greek Contracts Fall Under EU Rules After 1 January 2026

The European Commission’s biennial threshold revision, effective 1 January 2026, directly determines which Greek procurements must comply with the full procedural requirements of the EU directives, including mandatory publication in the Official Journal of the EU (OJEU), prescribed minimum time‑limits and the EU remedies directive. Contracts below the thresholds remain subject to national rules, which Law 5290/2026 now also modifies.

Pre‑2026 vs post‑1 January 2026 public procurement thresholds

Note: thresholds are expressed net of VAT. Where a contract’s estimated value falls close to the boundary, contracting authorities must aggregate lots and avoid artificial splitting, a requirement that Law 5290/2026 reinforces with enhanced penalties.

Worked examples

Municipal road project. A municipality procures a road‑surfacing contract estimated at €5,400,000 (net). Under the previous thresholds this exceeded the works threshold and triggered full EU rules. Under the revised thresholds (€5,538,000), the same contract falls below the EU threshold and is governed solely by Greek national procurement rules as amended by Law 5290/2026, a material difference in time‑limits, publication obligations and available remedies.

Hospital concession. A regional health authority plans a 25‑year hospital‑services concession valued at €12 million. This remains above both the previous and revised concession thresholds, so full EU procedures apply. However, the PPP classification changes in Law 5290/2026 may affect whether this is treated as a concession or as an availability‑payment PPP, with downstream consequences for risk transfer analysis and financing structure.

3. Unsolicited Proposals Under Law 5290/2026, Process for Bidders and Authorities in Greece

The unsolicited‑proposals regime is arguably the most consequential innovation in the 2026 reforms. Before Law 5290/2026, unsolicited proposals occupied a legal grey zone in Greek public procurement, tolerated in practice but lacking a clear statutory framework. The new provisions create a structured pathway from initial submission through to potential contract award, while preserving competitive tension and public‑interest safeguards.

3a. When an unsolicited proposal is permitted

Under the new rules, a private party may submit an unsolicited proposal to a contracting authority where:

• The proposed project is not already the subject of a pending or planned procurement procedure.
• The proposal involves a PPP or concession arrangement (not a standard supply or service contract).
• The proposal identifies a public need that the contracting authority has not yet addressed through its published procurement programme.

This last criterion, the “unmet public need” test, is new and is expected to be the primary filter through which authorities assess whether to engage with a proposal at all.

3b. Required contents, what private parties must include

Law 5290/2026 prescribes a minimum content framework for unsolicited proposals in Greece:

• Technical feasibility study. A detailed description of the project, its technical specifications, construction or delivery methodology and timeline.
• Financial model. Sources and uses of funds, projected revenues (if a concession) or availability‑payment structure (if a PPP), and a sensitivity analysis demonstrating financial viability.
• Public‑interest justification. An explanation of why the project serves the public interest, how it addresses the identified unmet need, and what value it delivers compared with traditional procurement.
• Risk allocation matrix. A proposed allocation of key project risks (construction, demand, maintenance, regulatory) between the public and private parties.
• Environmental and social impact assessment. Where applicable, a preliminary environmental impact statement or a commitment to conduct one during the evaluation phase.

3c. Evaluation process and transparency obligations

On receipt of an unsolicited proposal, the contracting authority must:

1. Acknowledge receipt within 15 working days and publish a notice on ΕΣΗΔΗΣ confirming that a proposal has been received (without disclosing commercially sensitive details).
2. Conduct a preliminary assessment against the public‑interest test within 60 calendar days.
3. If the proposal passes the preliminary assessment, appoint an evaluation committee and publish evaluation criteria on ΕΣΗΔΗΣ.
4. Complete the detailed evaluation, including independent technical and financial review, within 120 calendar days.
5. If the proposal is approved, initiate a competitive dialogue or negotiated procedure with publication, inviting competing proposals for at least 45 days.

The mandatory competitive stage is critical: an unsolicited proposal cannot result in a direct award. Industry observers expect this requirement to reduce the risk of legal challenge by unsuccessful competitors while preserving the incentive for private innovation.

3d. Timeframes and exclusivity rules

The original proposer receives a limited form of exclusivity during the evaluation phase: other private parties may not submit unsolicited proposals for the same project while the first is under evaluation. However, this exclusivity expires automatically if the authority misses the 120‑day evaluation deadline. The original proposer is also entitled to participate in the subsequent competitive procedure and receives a scoring bonus (the precise percentage to be determined by ministerial decision) in recognition of their origination costs.

3e. Bidder checklist for unsolicited proposals in Greece

• Confirm the project is not already listed in the authority’s published procurement programme.
• Prepare all five required documents (technical study, financial model, public‑interest justification, risk matrix, environmental assessment).
• Submit via the ΕΣΗΔΗΣ platform with qualified electronic signatures.
• Monitor the 15‑day acknowledgment and 60‑day preliminary‑assessment windows.
• Prepare competitive‑phase bid documentation in parallel, the 45‑day competitive window is short.
• Budget for origination costs, recognising that the scoring bonus partially, but not fully, offsets them.

4. PPPs and Concessions, Procurement, Exclusivity, HRADF and Privatisation Impacts in Greece

Law 5290/2026 addresses a persistent source of structuring uncertainty in Greek PPPs: the boundary between a concession (where the private partner bears genuine demand risk) and an availability‑payment PPP (where the public authority guarantees payments linked to performance, not usage). The practical consequences of this classification extend to financing, accounting treatment and, under the revised thresholds, whether EU procurement rules apply at all.

4a. How PPPs are classified under the 2026 reforms

The law requires contracting authorities to classify each PPP arrangement as either a concession or an availability‑payment contract at the procurement‑design stage, based on a structured risk‑transfer analysis. A project qualifies as a concession only where the private partner bears “significant operating risk”, meaning that, under normal operating conditions, the partner is not guaranteed to recover its investment and operating costs. Where payment is primarily linked to availability and performance standards, the contract is classified as an availability‑payment PPP and is subject to the standard supply/services procurement thresholds rather than the higher concession threshold.

4b. Interaction with HRADF privatisation pipelines

The Hellenic Republic Asset Development Fund (HRADF) manages Greece’s privatisation programme, which includes major infrastructure concessions (ports, airports, motorways, energy assets). Law 5290/2026 explicitly states that unsolicited proposals may not be submitted for assets already within the HRADF pipeline. However, the likely practical effect of the new unsolicited‑proposal regime is that private parties may use it to propose complementary projects, for example, ancillary infrastructure serving an HRADF concession, that are not themselves within the Fund’s portfolio.

4c. Drafting and financing flags for PPP investors

Concession and PPP sponsors operating in Greece should take the following immediate actions:

• Review existing PPP structures. Confirm that the risk‑transfer classification remains correct under the new definitions. A reclassification from concession to availability‑payment PPP could lower the applicable threshold, potentially bringing the contract under full EU rules.
• Update project agreements. Ensure that risk‑allocation clauses and payment mechanisms are drafted with sufficient clarity to withstand regulatory scrutiny of the classification.
• Engage lenders early. Financing institutions will require comfort that the procurement classification is defensible, particularly where EU remedies exposure changes as a result of Law 5290/2026.
• Monitor HRADF updates. Confirm whether target assets or adjacent projects have entered the privatisation pipeline before investing in unsolicited‑proposal preparation.

5. Preparing Compliant Bids in Promitheus / eProcurement, A Practical Public Procurement Greece Checklist

All formal procurement procedures in Greece, whether initiated by a contracting authority or triggered by an unsolicited proposal that has progressed to the competitive stage, are conducted through the National Electronic Public Procurement System (ΕΣΗΔΗΣ), accessed via the Promitheus platform. Compliance failures at the submission stage remain one of the most common grounds for bid exclusion.

Step‑by‑step Promitheus submission checklist

1. Register on Promitheus. Ensure company registration is current and that all authorised signatories hold valid qualified electronic signatures (QES) issued by an EU‑recognised trust service provider.
2. Download the tender documents. Access the full procurement file via ΕΣΗΔΗΣ, including technical specifications, contract terms and evaluation criteria.
3. Prepare the qualification envelope. Include certificates of good standing, tax and social‑security compliance certificates (issued within the preceding three months), evidence of professional capacity, and a European Single Procurement Document (ESPD) or national equivalent.
4. Prepare the technical envelope. Address every evaluation criterion specified in the tender documents. Missing or incomplete responses are the single most common cause of exclusion.
5. Prepare the financial envelope. Submit pricing in the prescribed format. Ensure arithmetical accuracy, contracting authorities may correct obvious errors but are not required to do so.
6. Upload and sign. Upload all envelopes to ΕΣΗΔΗΣ before the submission deadline. Apply QES to each document. The platform locks submissions at the deadline, late uploads are automatically rejected.
7. Retain evidence. Download and archive the platform‑generated submission receipt, including timestamp and document hash. This is essential evidence in any subsequent challenge.

Common mistakes and mitigations

• Expired certificates. Tax and social‑security certificates must be current at submission. Set calendar reminders at least 30 days before the deadline to request fresh certificates.
• Signature failures. QES token expiry or software incompatibility can prevent signing. Conduct a test upload at least 48 hours before the deadline.
• Incomplete ESPD. The self‑declaration must cover all mandatory and discretionary exclusion grounds. Cross‑check against the tender notice, which may add authority‑specific requirements.
• Lot‑by‑lot compliance. Where a procurement is divided into lots, each lot requires a separate compliant submission. Bidders frequently miss lot‑specific technical requirements.

6. Remedies and Tender Dispute Strategy After Law 5290/2026, Administrative Courts and Injunctive Relief

The remedies framework is where Law 5290/2026 makes its most tactically significant changes for tender disputes Greece practitioners must master. Greece’s pre‑contractual review system channels challenges through the Hellenic Single Public Procurement Authority (EAAΔHΣΥ) for below‑threshold contracts and through the Administrative Courts of Appeal for above‑threshold contracts. The 2026 reforms adjust timelines and procedural sequencing in both tracks.

6a. Administrative remedies, timelines and filing requirements

Under the amended framework, the key deadlines for challenging a procurement decision are:

• Pre‑contractual application to the Administrative Court of Appeal. Must be filed within ten (10) calendar days of notification of the contested decision (previously fifteen days for certain contract types). The shortened window applies to contracts above the EU thresholds.
• EAAΔHΣΥ complaint (below‑threshold contracts). Must be filed within ten (10) calendar days of the contested act. The Authority must issue a decision within twenty (20) working days.
• Standstill period. Contracting authorities remain prohibited from signing the contract during the standstill period (minimum ten calendar days from notification of the award decision). Filing a pre‑contractual application extends the standstill automatically until the court issues its decision.

6b. Interim relief and emergency injunctions

A bidder who files a pre‑contractual application may simultaneously request interim measures, including suspension of the procurement procedure and prohibition of contract signature. The Administrative Court of Appeal must hear the interim‑relief application within a compressed timetable. The likely practical effect of the amended rules is that courts will prioritise these applications, but bidders should prepare evidence and legal arguments before the award decision is issued, given the shortened ten‑day filing window.

6c. Tactical options for winners and losers

For unsuccessful bidders (challengers):

• File the pre‑contractual application within the ten‑day window, this is a strict deadline and courts have consistently rejected late filings.
• Request interim measures simultaneously. A bare application without interim relief allows the authority to sign the contract once the standstill expires.
• Gather evidence during the tender process, not after. Request access to the evaluation report and scoring sheets immediately upon notification of the award.

For winning bidders (defenders):

• Intervene in any pre‑contractual proceedings as an interested party. Failure to intervene may result in the contract being set aside without the winning bidder’s arguments being heard.
• Prepare a detailed factual record of compliance with the evaluation criteria, anticipating that challengers will target scoring methodology or evaluation‑committee composition.
• Coordinate with the contracting authority to ensure the standstill period is properly observed, premature contract signature exposes both authority and contractor to annulment proceedings.

6d. Practical timeline, from filing to resolution

Note: timelines are indicative and depend on court caseload and case complexity. In high‑value procurements, courts have expedited hearings to within 20 days of filing.

7. Procurement Compliance Greece, Risk Checklist for Contracting Authorities and Bidders

The following checklists consolidate the key compliance obligations arising from Law 5290/2026 and the revised EU thresholds.

For contracting authorities

• Threshold check. Re‑evaluate all pending and planned procurements against the 1 January 2026 thresholds. Contracts that previously exceeded the EU threshold may now fall below it, adjust procedures, publication requirements and time‑limits accordingly.
• PPP classification. Document the risk‑transfer analysis at procurement‑design stage. Retain the analysis in the procurement file for audit and challenge purposes.
• Unsolicited‑proposal protocol. Establish an internal procedure for receiving, acknowledging and evaluating unsolicited proposals within the statutory deadlines (15 days acknowledgment, 60 days preliminary assessment, 120 days detailed evaluation).
• ΕΣΗΔΗΣ publication. Ensure all notices, including unsolicited‑proposal receipts, are published on the eProcurement platform in the prescribed format and timeframe.
• Evaluation transparency. Publish evaluation criteria before bid opening. Document scoring rationale in sufficient detail to withstand judicial review.
• Standstill compliance. Do not execute contracts before the standstill period expires. Monitor for pre‑contractual applications that extend the standstill.

For bidders

• Document currency. Confirm that all certificates (tax, social security, good standing) are valid at the submission deadline, not merely at the date of preparation.
• QES readiness. Test electronic‑signature functionality on ΕΣΗΔΗΣ at least 48 hours before submission.
• Challenge readiness. Build a “challenge file” during the tender process: archive all communications, download evaluation reports promptly, and pre‑draft key sections of a pre‑contractual application to meet the ten‑day deadline.
• Unsolicited‑proposal due diligence. Before investing in proposal preparation, verify that the target project is not within the HRADF pipeline or subject to a pending procurement.
• Scoring‑bonus awareness. If submitting an unsolicited proposal, factor in the origination‑cost scoring bonus when modelling the competitive‑phase bid strategy.

8. Key Legislative and Threshold Dates, Timeline

9. Conclusion and Next Steps for Public Procurement Greece Practitioners

Law 5290/2026 and the revised EU thresholds represent a structural shift in how public procurement Greece operates. Bidders gain a formal unsolicited‑proposal channel, but must comply with rigorous documentation and procedural requirements. Contracting authorities face tighter transparency obligations and a reformed remedies regime that shortens challenge windows while strengthening interim relief. PPP sponsors must revisit risk‑transfer classifications that may now trigger different procurement rules.

The immediate priorities are clear: update internal procurement procedures, recalibrate threshold assessments, establish unsolicited‑proposal intake protocols, and build challenge‑readiness into every bid process. Given the compressed timelines, particularly the ten‑day filing window for pre‑contractual applications, early engagement with experienced public procurement lawyers in Greece is essential.

Appendix, Downloadable Resources and Templates

The following resources support compliance with Law 5290/2026 and the revised public procurement Greece framework:

• Unsolicited Proposal Template. Structured document covering all five mandatory components (technical feasibility, financial model, public‑interest justification, risk matrix, environmental assessment), formatted for ΕΣΗΔΗΣ submission.
• Promitheus Bid‑Submission Checklist. Step‑by‑step checklist covering registration, document preparation, electronic‑signature requirements and deadline management.
• Pre‑Contractual Challenge Preparation Kit. Includes a timeline calculator (from award‑notification to filing‑deadline), template interim‑relief request and evidence‑gathering checklist.
• PPP Classification Decision Tree. Flowchart guiding contracting authorities and sponsors through the concession vs availability‑payment classification analysis under Law 5290/2026.
• EU Threshold Quick‑Reference Card. One‑page comparison of pre‑ and post‑1 January 2026 thresholds by contract type, with notes on aggregation rules.

To request access to these resources, contact a qualified procurement adviser or reach out through the Global Law Experts platform.

Sources

1. National eProcurement Portal (ΕΣΗΔΗΣ)
2. Gov.gr, NEPPS / Promitheus Guidance
3. Bernitsas Law, Amendments to Unsolicited Proposals Under Law 5290/2026
4. ICLG, Public Procurement Laws and Regulations Greece
5. Legal 500, Greece Public Procurement Guide
6. OECD, Managing Public Procurement Risks in Greece
7. <a href="https://www.zeya.com/newsletters/reforming-gre