Short answer: The UK has recognised data centres as Critical National Infrastructure (CNI), but the evidence available to 13 October 2026 does not show that this designation has removed the connection bottleneck. A reported 72.8 GW of data-centre capacity sits in the Great Britain connection queue, while regulators are still consulting on ways to separate credible projects from speculative applications. Getting “enough” connected will require clean queue data, fair prioritisation and physical network construction—not a designation alone.
What CNI status changes—and what it does not
The government designated UK data centres as Critical National Infrastructure in 2024. The Office for National Statistics (ONS) places them alongside infrastructure functions such as energy and water supply because they support essential services and economic activity. That is a statement of strategic importance: disruption to major facilities could affect services that businesses, public bodies and households rely on.
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CNI status is not, by itself, a guaranteed electricity connection, a planning consent or a right to jump ahead of other applicants. The designation does not establish a particular connection date, reserve a quantity of grid capacity or create a published set of cyber, physical-security or water obligations. The material reviewed here does not quantify those obligations, so they should not be inferred from the label.
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- Strategic importance: CNI recognition answers “yes”.
- Deliverable connections: the size and quality of the queue, and the ability to energise projects on time, remain under pressure.
- Adequacy of policy and investment: reforms are under way, but the evidence does not set a final threshold for how much capacity, network investment or delivery speed would count as sufficient.
What the connection numbers actually tell us
A written parliamentary answer from the Department for Energy Security and Net Zero (DESNZ), published on 7 September 2026, reported that National Energy System Operator (NESO) data collected in 2025 showed 72.8 GW allocated to data centres in the Great Britain electricity connection queue. The figure combines transmission and distribution connections.
That is queue capacity, not electricity already being consumed. It is not a count of buildings, a forecast of operational load, or a measure of constructed or energised sites. DESNZ said it could not provide the number of individual projects represented by the 72.8 GW. Without a project count, location, stage of development and expected energisation date, the number cannot show how many facilities will actually be built.
The parliamentary question also raised the practical conflict: how many centres have requested or received offers, what capacity they seek, and what effect could that have on connection dates for housing, manufacturing and low-carbon generation? The published answer does not provide a complete project-level dataset that resolves those questions.
Why a queue can grow faster than real demand
Applicants can seek a connection before they have secured land, planning consent, finance, equipment or a firm construction programme. A large request can therefore represent an option on future capacity rather than a project ready to build. If projects that do not progress retain their position, viable schemes wait behind paper capacity.
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Ofgem described this pressure in its 29 July 2026 release. Contracted demand connection offers rose from 41 GW in November 2024 to 125 GW in June 2025, with the increase driven largely by data centres. Ofgem attributed at least 80 GW of that demand-offer total to data centres. These are offers across demand projects; they are not a separate tally of operating data centres and should not be added to the 72.8 GW queue figure as if the measures were identical.
Ofgem Director for Energy System Design and Development Eleanor Warburton explained the regulator’s rationale: “Britain’s electricity demand connections queue has more than tripled in size in less than a year, and consumers should not bear the risks created by speculative projects taking up space in the system.” The statement accompanied a consultation, not a declaration that the problem had been solved.
What reforms are on the table
Data-centre commitment fee and progress milestones
Ofgem opened a data-centre-focused consultation on 29 July 2026, which closed on 16 September. It proposed a refundable Data Centre Commitment Fee of £237,500 to £712,500 per MW. Ofgem characterised that range as approximately 2.5% to 7.5% of average project costs. The evidence available here does not include a final decision, so the fee must be treated as a proposal rather than an adopted charge.
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| Measure | What it is intended to do | Status as at 13 October 2026 |
|---|---|---|
| Refundable commitment fee | Make applicants demonstrate financial commitment and release capacity held by projects that do not proceed. | Proposed in Ofgem’s consultation; final adoption is not established in the available evidence. |
| Progress milestones | Test financial capability, commercial maturity and procurement activity at defined stages. | Proposed; implementation details and final requirements are not established here. |
| Wider demand-connection reform | Filter non-viable projects, plan for strategic demand and speed physical connections. | Under the “Curate, Plan, Connect” programme; outcomes are mixed across projects. |
“Curate, Plan, Connect”
Ofgem’s wider Demand Connections Reform programme is organised around three actions:
- Curate: remove or deprioritise projects that are not viable or are not progressing.
- Plan: identify strategic demand and coordinate it with network investment.
- Connect: make the physical and administrative process faster for projects that are ready.
Ofgem reported that wider reforms had accelerated around 7.8 GW of projects by an average of six years. That is a significant reported result, but it is not a data-centre-specific outcome and does not prove that the entire data-centre queue is now deliverable.
Why queue reform cannot substitute for network construction
A faster offer is useful only if the network can be reinforced and the site can be energised. The government’s 2024 Statutory Security of Supply Report describes an objective to halve end-to-end transmission build times from 12–14 years to seven years. Seven years is a goal, not an achieved performance, and it illustrates the mismatch between a developer’s timetable and the time needed for consenting, procurement, construction and commissioning of major transmission assets.
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NESO became a publicly owned system operator on 1 October 2024. Its role, together with Ofgem and the network companies, is part of a governance change intended to make planning more strategic. It does not remove the physical lead time for substations, cables, transformers, protection systems and rights of way.
A data centre is more than a megawatt request
National Grid’s November 2025 Data Centre Impact Study lists dependencies that can determine whether a site is actually buildable:
- agreements with water companies;
- power connections and the network works behind them;
- district-heating feasibility where relevant;
- local employment commitments;
- biodiversity net gain;
- public-benefit packages; and
- planning and community considerations.
The study also noted that there was no equivalent comprehensive project pipeline register for demand comparable to the register used for generation. That transparency gap matters. A credible system should distinguish a speculative enquiry, a signed offer, a project with finance and equipment orders, a site under construction, and a facility that has been energised.
Are other connection applicants being treated fairly?
Scarce network capacity creates a distribution question, not only a data-centre question. Housing developments need electricity for homes and heat pumps; manufacturers need dependable power for new plant; and low-carbon generation needs a route to market. A policy that accelerates one category without explaining its effect on the others will not look fair, even if the accelerated projects are strategically important.
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The Clean Power 2030 approach provides a basis for strategic prioritisation, but the sources reviewed do not publish a single hierarchy that resolves every conflict between a data centre, a housing scheme, a factory and a generator. Nor do they quantify how many connection dates have moved because of data-centre applications. That makes transparent criteria essential.
| Assessment test | Evidence a sufficient system would publish | Position shown by the available evidence |
|---|---|---|
| Queue integrity | Project stage, milestones met, capacity released and reasons for removal. | Ofgem has proposed fees and milestones; a final operating regime is not established. |
| Fair prioritisation | Rules showing how strategic data centres are balanced against housing, manufacturing, electrification and clean generation. | Strategic planning is stated, but a complete cross-sector ranking is not supplied. |
| Connection versus construction | Dates for offers, reinforcement, consent, construction and energisation. | Reforms can accelerate some projects; transmission build times remain a long-term constraint. |
| Whole-site readiness | Evidence covering water, planning, heat, jobs, biodiversity and public benefits as well as power. | National Grid identifies these considerations; no comprehensive demand pipeline register is identified. |
| Transparency | Separate figures for applications, offers, credible demand, built capacity and energised capacity. | The 72.8 GW figure is published without an individual-project count. |
What “enough” should mean in practice
There is no authoritative number in the available evidence that defines a sufficient connection system. A more defensible test is whether the following conditions are met at the same time:
- Credible demand is measurable. Public reporting should show how many projects sit behind headline gigawatt figures, where they are, what stage they have reached and when they expect to use power.
- Capacity is released quickly. Applicants that miss financial, procurement or construction milestones should lose their queue position under clear, appealable rules.
- Priorities are explicit. Government and network operators should explain how data-centre connections interact with housing, manufacturing, electrification and clean-power objectives.
- Reinforcement is funded and scheduled. A connection offer should identify the network works required, their consenting status, procurement plan and realistic energisation date.
- Whole-site impacts are resolved. Water supply, heat recovery or district heating, biodiversity, employment and community benefits should be assessed alongside the electrical design.
- Results are independently visible. Regular reporting should separate queue capacity from contracted capacity, construction and energisation, with Great Britain and any other geography clearly labelled.
What this means for developers, contractors and local authorities
For developers
A grid offer should be treated as one workstream in a gated development programme. Before relying on a headline capacity figure, establish the connection point, reinforcement scope, milestone evidence, land and planning position, water strategy, cooling design, procurement schedule and funding. If the proposed commitment-fee regime is adopted, missing a milestone could have both financial and programme consequences.
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Projects may move from a long queue to a short delivery window if reforms release capacity. Contractors should therefore plan for evidence-led mobilisation: long-lead electrical equipment, substation interfaces, civil works, commissioning responsibility and environmental conditions need to be aligned with the network company’s programme. A nominal connection date is not a substitute for an integrated construction schedule.
For local authorities and communities
CNI status does not eliminate planning duties or local impacts. Authorities still need to examine water availability, traffic, employment, biodiversity net gain, heat opportunities and public benefits. Publishing the project’s actual stage and expected load is more useful to communities than presenting the national queue total alone.
So, are we doing enough?
The evidence supports a qualified answer: the response is active, but it is not yet demonstrably sufficient. Recognition as CNI correctly signals that data centres matter. Ofgem has identified speculative demand as a risk, consulted on a substantial refundable fee and milestones, and reported acceleration for projects under wider reforms. Government has also set strategic planning objectives and a long-term transmission build-time goal.
However, 72.8 GW in the Great Britain queue, the absence of an individual-project count in the parliamentary answer, the lack of a comprehensive demand pipeline register identified by National Grid, and the continuing need to build physical network assets show why designation and consultation cannot be treated as delivery. Until published data can distinguish credible demand from reserved capacity—and until reinforcement and site dependencies are delivered on matching schedules—the connection bottleneck remains an open infrastructure problem.
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