Summary
- The proposed guarantee is €200,000 per MW of maximum electrical demand.
- Applications would require planning, environmental and project timetable evidence.
- Additional proposed conditions cover renewable sourcing and very large facilities.
Greece’s Ministry of Environment and Energy has put draft data centre electricity-connection rules into public consultation until 24 October 2026. The proposed measures include a financial guarantee linked to requested demand and greater scrutiny of whether a project is sufficiently advanced to justify a network connection. They are not yet in force.
The ministry confirms a proposed guarantee of €200,000 for each megawatt of maximum electricity consumption. An applicant seeking 100MW would therefore face a proposed guarantee of €20 million, although the final law and its detailed treatment of individual projects could differ from the draft. The mechanism aims to deter applications that reserve scarce network capacity without sufficient evidence that the underlying development will proceed.
Planning and financing evidence before connection
Under the reported proposals, applications would need documentation covering legal rights to the site, environmental approval, an implementation timetable and preliminary building permissions. Facilities with a demand of more than 10MW would ordinarily be handled through the transmission system operator, while particular distribution-network cases would retain specific pathways.
The draft also describes a financial-strength test for projects connected to the transmission system. Applicants would need to substantiate turnover relative to construction cost, using an estimated development benchmark of €10 million per MW. That is a proposal intended to filter speculative demand, not a verified market estimate of every data centre’s construction cost.
Contemporaneous Greek reporting describes a three-year validity period for connection offers, with possible extensions under specified conditions. Separately, the proposed bank guarantee would have to remain valid for a minimum period; neither obligation is currently enacted. A signed grid connection offer would not itself commission the facility or guarantee that every subsequent construction and equipment milestone has been met.
The proposed framework also calls for data centres to source at least 60% of annual electricity consumption from renewables from the start of operations. The precise contractual and verification arrangements would need to be examined in the enacted rules. An annual share is different from supplying a continuous operating load with renewable generation at every hour.
Projects above 200MW could be assessed ahead of other data centre requests if they commit dispatchable generation or electricity storage covering at least 80% of maximum demand, according to the draft as described by Greek reporting. Where storage is used, it would need sufficient capacity for six hours at the relevant level. That would be priority within the data centre application category, not unconditional grid access or priority over other kinds of connection.
These requirements would shift financial risk towards project promoters at an earlier stage. Large electricity requests can cause network studies, reinforcement plans and other applicants’ decisions to be based on capacity that may never materialise. Requiring planning maturity and collateral can improve the credibility of the queue while imposing an additional capital burden on genuine developers.
The proposal’s treatment of project maturity is particularly relevant to large campuses that are designed in phases. A developer might seek an initial connection sufficient for one data hall while retaining land for later expansion. If guarantees are calculated against the entire maximum requested capacity, the financing requirement could be much larger than the capital needed for the first operational phase. The final text will determine whether phased applications, amendments and returned securities receive specific treatment. No such detailed outcome should be presumed while consultation remains open.
The ministry’s consultation closes on 24 October; the draft still requires the legislative process before any measures can operate. No applicant should be described as subject to the new guarantee until a final law establishes the operative provisions and commencement dates. Applicants would need to assess when planning, environmental and financing documents must be completed under the final legislation before seeking a firm connection offer.
