Ofgem plans big deposits for data centres

What's happened

Ofgem has proposed refundable upfront deposits between £237,500 and £712,500 per megawatt for projects seeking grid connections, to stop speculative data‑centre schemes clogging the queue. The regulator has opened a consultation to force applicants to hit hard milestones or lose their place as Britain faces connection requests vastly above peak demand.

What's behind the headline?

What Ofgem is doing and why

• Ofgem has proposed charging refundable deposits per megawatt to deter speculative projects from holding scarce grid capacity. Developers would keep their place only if they meet milestones such as securing customers and finance.

How this will change development economics

• Requiring deposits of hundreds of thousands per MW will force developers to finance a large portion of connection risk up front. That will increase project costs and will filter out projects without committed customers or funding. Large builds that need 500MW–1GW will face up‑front pledges in the hundreds of millions.

Likely short-term consequences

• Some announced projects will be paused or cancelled rather than post large deposits. Utilities and grid operators will see a thinner queue more reflective of deliverable projects. Local opposition to new builds will remain a political obstacle where consent and planning are unresolved.

Medium-term outcomes

• Developers that can demonstrate firm customers and capital will gain priority; speculative plans will lose leverage. This will accelerate decisions about whether to build on‑site generation or pursue grid connections. Projects that rely on behind‑the‑meter power will continue attracting attention but will face scrutiny over reliability and emissions costs.

Forecast

• The policy will reduce the connection queue and shift the industry toward better‑underwritten projects. It will increase capital requirements for new data‑centre builds and will speed some firms toward either firm grid commitments or clarified off‑grid strategies, which will in turn shape where and how AI compute capacity expands.

How we got here

Connection requests to Britain's electricity grid have surged from 41GW to 125GW in a year, far exceeding 2025 peak demand of about 46GW. Data centres account for a large share of new applications and face local opposition over noise, water use and power draw. Ofgem is consulting until 16 September on measures to prioritise projects likely to be built.

Our analysis

The BBC has summarised Ofgem's proposal and its scale, noting the regulator's consultation and a recommended refundable fee between £237,500 and £712,500 per megawatt; the corporation quoted Eleanor Warburton, Ofgem's director for energy system design and development, saying "consumers should not bear the risks created by speculative projects taking up space in the system." The Guardian provides sharper colour on the queue, reporting 315 data centres representing 73GW waiting to connect and giving the practical example that Ofgem has proposed "pledges of £350m to reserve 500MW of grid capacity." TechCrunch and Axios broaden the picture internationally: TechCrunch explains parallel moves by US grid operators to curtail large users during shortages and the risk that sites will rely on diesel or onsite generation, while Axios highlights a trend toward behind‑the‑meter power and recent deployment problems that have spurred investor caution. Read the BBC for the consultation details and Ofgem quotes, the Guardian for specific queue figures and proposed pledge examples, and Axios and TechCrunch for how grid constraints are forcing some data‑centre builders toward onsite power and the operational risks that follow.

Go deeper

• How will deposits affect small versus hyperscale data‑centre developers?
• Will major cloud providers accept higher upfront costs or move to more onsite generation?
• How quickly will the consultation produce binding changes to connection rules?

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