Portugal is finalising a decree that would impose strict electricity, water and environmental conditions on a rapidly expanding data-centre industry. The government says the rules will require renewable power and prevent cooling systems from competing with households and other economic activity for fresh water. The measure is still being prepared, so these are proposed requirements rather than a fully enacted operating regime.
The stakes are material. Projects in Portugal’s data-centre pipeline exceed 2.6 gigawatts, led by Start Campus’s planned 1.2 GW complex in Sines. That figure describes potential capacity, not current consumption: many projects must still secure permits, grid connections, financing and customers before they can operate at their announced scale.
Under the planned framework, a project that needs water for cooling would have to avoid fresh water or arrange an alternative supply that does not compete with people, businesses or the broader economy. Options may include seawater, reclaimed water or closed-loop designs, but each has its own energy use, discharge, corrosion, treatment and ecosystem implications.
Start Campus has opened the first of six planned buildings at Sines and uses seawater cooling while saying its operations run on renewable electricity. Its design illustrates how coastal geography can reduce freshwater pressure, yet seawater intake and thermal discharge still require rigorous environmental review. One operating building should not be confused with completion of the full 1.2 GW campus.
Renewable power could be obtained from solar, wind or hydropower and purchased through utilities. Matching annual renewable certificates is not necessarily the same as supplying carbon-free electricity every hour. Policymakers will need to distinguish procurement claims from additional generation, transmission availability, storage and the grid’s carbon intensity during periods of peak data-centre load.
A mandatory assessment will examine environmental consequences before approvals. Large campuses can concentrate electricity demand, substations, transmission lines, backup generation, construction, land use and noise. They can also bring investment, tax revenue and skilled employment. The policy challenge is to value those benefits without transferring water scarcity, network costs or pollution to local communities.
Portugal’s Atlantic cable links, renewable resources and available industrial land make it attractive for cloud and artificial-intelligence infrastructure. But the same AI boom is raising power demand faster than many grids can add generation and connections. Clear rules can reduce planning uncertainty if standards, measurement methods and enforcement are specific and applied consistently.
The decree’s final text will determine whether the policy changes project economics or mainly codifies practices already used by leading developments. The evidence to watch includes publication and commencement dates, water-accounting rules, hourly power requirements, grid-connection conditions, environmental decisions and which parts of the 2.6 GW pipeline actually reach construction and operation.
