Greece's Ministry of Environment and Energy has drafted legislation that would force data centers to source at least 60 percent of their power from renewables — and back their grid applications with €200,000 ($224,089) per MW in bank guarantees.

The draft, now in consultation until October 24, 2026, is the second move of its kind in Europe this year. Spain proposed stricter rules in August: an 80 percent renewable requirement, matched hourly against new renewable generation. Greece's 60 percent threshold comes without the hourly matching component.

For operators, the headline change is financial. The guarantee requirement is designed to keep speculative applications out of the grid connection queue — a chronic bottleneck across European markets.

What else does the draft require?

The legislation bundles several provisions that change how a data center project gets built in Greece:

• Investors must reserve grid capacity only when they can prove sufficient financial backing and investment readiness
• Data centers must cover grid connection costs and related grid reinforcement costs
• Projects connecting to the transmission system face financial capacity checks, including turnover criteria
• The Regulatory Authority for Waste, Energy and Water (RAAEY) will create a data center registry to track sector development and improve transparency
• Transmission and distribution operators must publish regional data on available connection capacity every three months

The registry and quarterly capacity disclosures are transparency tools. Practically, that means prospective operators will be able to see where capacity actually exists before spending money on applications.

What are flexible connection agreements?

The draft introduces flexible grid connection agreements in locations with insufficient capacity. Under these agreements, grid operators can limit how much power a facility draws from the grid, within set limits.

That's a meaningful trade for operators: cheaper or faster connections in constrained zones, in exchange for accepting curtailment risk. Similar schemes in the UK and Ireland have pushed some operators toward on-site generation and storage to hedge against those limits.

What about the €2.3 billion fund?

Alongside the data center rules, the legislation establishes a €2.3 billion ($2.57 billion) Island Decarbonization Fund. It will finance projects that cut reliance on oil-fired generation on Greece's islands in favor of renewables and storage.

For data center planners, the islands are a double signal. The fund could expand clean generation capacity in exactly the places where grid constraints bite hardest — but it also signals where Greek energy policy is directing capital over the next decade.

How big is the Greek market?

Greece remains a small European data center market, but it has expanded significantly in recent years. Data Center Map counts 29 operational facilities run by 19 operators. Digital Realty entered the market in April last year, opening its first Greek data center on the island of Crete.

A 60 percent renewable mandate is less demanding than Spain's 80 percent hourly-matched proposal, but Greece's grid mix and island geography make compliance planning a different exercise. Operators weighing entry now have until October 24, 2026 to weigh in on the consultation before the rules harden.