The next major source of electricity demand growth in Southeast Europe may not come from traditional sectors such as households, heavy industry or electric vehicles. Increasingly, data centres are emerging as a new strategic driver of power consumption. Greece has already provided an early indication of this trend, with applications from data-centre developers seeking access to the high-voltage grid rising above 4.5 GW, compared with approximately 1.2 GW at the end of 2025.
The growth in demand is spreading beyond Athens, where available grid capacity is becoming increasingly limited. Developers are now focusing on regions such as Western Macedonia, Central Greece, Epirus and Evros, where transmission infrastructure offers greater potential for new connections. This shift highlights a broader trend: access to reliable electricity is becoming one of the most important factors determining the location of future digital infrastructure.
The scale of interest is already significant. ADMIE has issued final connection terms for eight data-centre projects with a combined capacity of around 520 MW, while active applications in the wider Attica region are estimated at below 500 MW as developers move toward areas with more available network capacity. The challenge is not only the volume of demand, but also how connection requests are managed. In many cases, projects are processed according to submission order, meaning that developments in congested areas can slow progress even when capacity exists elsewhere.
For Southeast Europe, Greece represents both a warning and an opportunity. Data centres are fundamentally different from traditional electricity consumers. They require 24-hour reliability, redundant grid connections, advanced cooling solutions, strong digital infrastructure, renewable power sourcing and verifiable clean electricity credentials. While they can provide stable baseload demand and support generation investment, they can also create significant pressure on local electricity networks. A single large facility consuming several hundred megawatts continuously can reshape the economics of an entire regional electricity node.
Recent electricity market developments make this issue even more relevant. During the second half of June, HU+SEE electricity consumption increased by 3,360 MW as rising temperatures pushed demand higher and created tighter market conditions. Data centres would introduce a different type of pressure: demand that is less seasonal, more predictable and supported by strong credit quality, but also more demanding in terms of reliability and uninterrupted supply.
This trend creates new opportunities for countries such as Serbia and Montenegro. Serbia has several advantages, including available industrial land, expanding renewable energy capacity, strong regional interconnections and the potential to combine solar, wind, storage and future pumped-storage projects into dedicated power solutions for digital infrastructure. Montenegro offers hydropower resources, growing interest in solar development, Adriatic connectivity and potential advantages from regional fibre networks. However, its tighter domestic electricity balance and exposure to imports during generation shortfalls remain important challenges.
For both markets, attracting data-centre investment will depend on treating renewable electricity as a fully engineered infrastructure solution rather than simply a sustainability commitment. Developers will require reliable power supply arrangements supported by grid capacity, storage solutions and long-term contracts.
The financing requirements are also becoming more complex. Large-scale or AI-focused data centres need more than a standard electricity agreement. They require detailed grid-impact assessments, secure supply strategies, advanced metering systems, Guarantees of Origin or equivalent certification mechanisms, and increasingly, hourly matching between electricity consumption and low-carbon generation sources. For international technology companies, the quality and transparency of the power supply package can become a decisive factor when selecting locations.
This creates a strong investment case for hybrid renewable energy projects. Solar generation alone cannot fully support continuous data-centre demand because production is concentrated during daylight hours. Wind can improve the generation profile, while hydro, flexible gas capacity and battery storage can provide balancing capability and resilience. The most competitive projects will combine renewable generation, storage, grid access, backup capacity and transparent monitoring systems.
Data centres are therefore becoming a power-market issue before they become a real-estate issue. The key constraints will not only be land availability, but also transmission capacity, connection timelines, cooling requirements, permitting processes and the ability to demonstrate reliable low-carbon electricity supply.
Greece’s rapid increase in grid connection applications is an early signal of a broader regional transformation. Southeast Europe’s electricity markets may soon need to prepare for a new demand cycle where digital infrastructure becomes one of the most important drivers of investment in grids, renewables and flexibility assets.