Power First: Grid Connection Strategy for Data Centres in Greece

In every data centre feasibility study we have seen succeed, the electricity question was answered before the real estate question. In most that struggled, it was the other way around. Greece has power — the challenge is that it is not always where the demand wants to be.

The Real Constraint Is Locational

Hyperscale and colocation demand clusters around Athens for the same reasons it clusters around Frankfurt or Milan: fibre routes, cable landing stations, customers and skilled labour. But the strongest available grid capacity increasingly lies elsewhere — notably in Western Macedonia, where the retirement of lignite plants has freed substantial transmission infrastructure. This is precisely the logic behind PPC's plan to convert former mining land into data centre campuses.

For an investor, this creates a genuine strategic decision: compete for constrained capacity near Athens, or trade latency and ecosystem proximity for faster, cheaper power elsewhere. Neither answer is universally right — but the decision should be made deliberately, at the start, with a full picture of connection options.

Elements of a Power Strategy

Demand definition

Initial IT load, ultimate campus load, ramp profile and redundancy requirements determine the connection voltage level and whether a dedicated substation is needed. Under-declaring demand to simplify the initial connection is a false economy that constrains every later phase.

Connection application and works

The connection offer from the competent operator defines the technical solution, the works, the cost and — critically — the timeline. Where network reinforcement or extension is required, the sequencing of those works against construction milestones becomes a central contractual issue with the EPC contractor.

Cost sharing

Where multiple users benefit from the same high-voltage connection works, the cost-sharing framework of Article 98 of Law 4951/2022 — made operational by RAAEY Decision 5577/2025 after a long regulatory delay — can materially affect connection economics. It deserves a place in any feasibility model.

Energy sourcing and sustainability

Corporate power purchase agreements (PPAs) with renewable generators, on-site or near-site generation, storage and backup autonomy all interact with the EU sustainability framework: data centres of 500 kW+ IT demand must report energy KPIs — including their renewable energy factor — to the European database annually. Power sourcing is now a compliance topic, not only a cost topic.

Contractual Consequences

The grid dimension flows directly into the project's contracts. Connection milestones should be mirrored in EPC completion mechanics; delay regimes should distinguish operator-caused delay from contractor-caused delay; and testing, energisation and commissioning sequences should align with the operator's procedures. A grid milestone missed in the contracts is a dispute waiting for a date.

This article provides general information, verified against the cited sources at the date of publication. It does not constitute legal, tax or investment advice.