Data centres can be built far faster than the electricity infrastructure needed to serve them. The International Energy Agency (IEA) estimates that data-centre construction can take one to three years, while planning, permitting and completing grid infrastructure can take five to 15 years. That mismatch is a growing risk for projects—not proof that every proposed facility will be built or delayed.
Why are data centres being built so quickly?
Demand for computing—particularly for artificial intelligence—is driving investment in new facilities. Data centres are large construction projects, but their power needs must be served by a wider system of generation, substations, transmission and distribution networks. Even when a site and building can be delivered on a short schedule, securing a reliable electricity connection may take substantially longer.
The mismatch is not only about construction crews or building materials. The IEA identifies tight supply chains for transformers, gas turbines, advanced chips and IT components, as well as planning and regulatory delays. A project can therefore face constraints both in the equipment needed to operate the facility and in the infrastructure needed to supply it. IEA, 2026
How much electricity will data centres use by 2030?
The IEA’s 2026 central projection puts data-centre electricity consumption at 485 terawatt-hours (TWh) in 2025, rising to about 950 TWh in 2030. It also reports that data-centre electricity demand increased 17% in 2025, compared with 3% growth in global electricity demand that year. These are estimates and projections, not a promise that all planned facilities will be completed and connected. IEA, Key Questions on Energy and AI IEA, 2026 press release
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The IEA says infrastructure bottlenecks reduce the likelihood of more aggressive near-term demand scenarios. Actual consumption will depend on whether projects proceed, how quickly they connect, technology and utilization, among other economic conditions. A forecast should therefore be read as a view of possible demand under stated assumptions, not as a construction schedule.
Why can’t the power grid keep up?
Grid projects follow a longer timetable
In its 2026 analysis, the IEA gives broad timelines of five to 15 years to plan, permit and complete grid infrastructure, compared with one to three years to construct a data centre. Those ranges are not the timetable for every project, but they illustrate why a facility may be ready before the network can provide the required connection. IEA, Electricity 2026
Connection queues span multiple kinds of projects
The IEA reports that more than 2,500 gigawatts (GW) of renewable, large-load and storage projects are stalled in connection queues worldwide. That is a combined queue figure across project types; it must not be described as data-centre capacity alone. Queues also change as projects advance, are cancelled or are reassessed. IEA, Electricity 2026
A separate IEA estimate, published in 2025, suggested that around 20% of global data-centre capacity planned for construction by 2030 could be delayed by grid constraints. This is a risk estimate, not a measured share of facilities that were ultimately delayed. IEA chart, updated 3 April 2025
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The constraint is broader than the connection line
Connecting a new load can require more than extending a cable to a site. Network capacity, substations and other equipment must be available, and approvals and supply chains can affect delivery. Transformers are among the equipment the IEA identifies as being in tight supply. A project may also depend on scarce power-generation equipment and IT components, so resolving one bottleneck does not necessarily remove the others. IEA, 2026 press release
What can developers and grid operators do?
Build new grid infrastructure
Network upgrades and new grid construction can add capacity where it is needed, but the delivery timetable can extend beyond a data-centre construction programme. Planning, permitting, equipment availability and local impacts all matter. New infrastructure is a long-term response, not an automatic short-term fix.
Use existing networks more effectively
The IEA points to grid-enhancing technologies and regulatory changes as ways to unlock hosting capacity while new infrastructure is developed. These measures can help make better use of existing networks; they do not mean every location has spare capacity or eliminate the need for construction where additional capacity is required. IEA, Electricity 2026
Generate power on site
Some US developers are advancing projects that use on-site natural-gas generation in response to slow grid connections. This can provide an alternative source of power for a project, but it is not frictionless: the IEA notes technical and financial hurdles, including the challenge of reliably serving variable AI workloads. On-site generation also requires its own equipment and approvals, and shifts rather than automatically resolves questions about system capacity and local impacts. IEA, 2026 press release
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These approaches are not interchangeable. New grid capacity and better use of existing networks address network constraints in different ways; on-site generation changes how a facility obtains power. The right solution depends on delivery time, dependable supply, connection and upgrade needs, local impacts and permitting. The available evidence does not establish a comprehensive cost comparison among them.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How is policy responding? The UK example
A UK government consultation proposes aligning data-centre connections with the energy system and managing scarce available network capacity. It discusses options that would allow developers in AI Growth Zones to build high-voltage grid infrastructure. This is consultation and policy work, not a completed reform or a rule that applies globally. UK government consultation
What the construction boom means for project planning
For developers, contractors and communities, the key issue is sequencing: a building programme can move ahead on a timetable that the grid connection, equipment supply and approvals cannot match. Assessing a proposed project therefore means looking beyond the facility itself to the power-delivery plan and its dependencies. Demand projections indicate the scale of potential growth, but actual construction and operation will depend on whether those constraints can be resolved.
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