The UK data centre pipeline is approaching £100 billion in combined project value, according to analysis by industry insight specialist Barbour ABI, yet a deepening bottleneck in power, labour and planning threatens to keep much of that investment on paper rather than on site.
Barbour ABI’s figures, published alongside data from Reuters, set the current position in stark relief. £1.75 billion was spent on new UK data centres last year, with £2.38 billion forecast for 2025. By 2029, that annual figure is projected to reach £10 billion, a more than five-fold increase. Against an estimated base of BBC News-reported 477 data centres currently operating across the UK, the scale of expansion under contemplation is considerable.
The Pipeline in Numbers
Barbour ABI’s breakdown of the development pipeline illustrates just how much activity is queuing behind the schemes already on site. Seventy data centres with a build value of £2.6 billion are complete, and a further 21 on site will push the constructed total to £4.9 billion. Behind them, 55 schemes carrying detailed planning approval but yet to break ground represent a combined £12.7 billion. Twenty-two projects at outline approval stage add another £24.5 billion, while 64 applications submitted for planning consent carry a total estimated value of £40.6 billion. A further 21 schemes at pre-application stage could cost £23.2 billion to build. Taken together, if every project in the UK data centre pipeline were delivered, Barbour ABI estimates 9.3 million square metres of new data centre space would be created.
Among the largest schemes now proposed is a $13 billion hyperscale data centre in North East England put forward by Blackstone, which Reuters reports as the single biggest planned project in the country.
Recent planning decisions have added further weight to the pipeline. Apt received consent for a hyper-scale facility on a 6.8-hectare brownfield site in Ealing, west London, while Graeme Nicholls Architects revealed designs for a 280,000m² hyperscale facility near Auchtertool in Fife, described as Scotland’s largest data centre to date.
UK Data Centre Pipeline Faces Multi-Front Delivery Challenge
The headline pipeline figure, however, conceals how difficult conversion from consent to construction has become. Steve Shelley, chief data analyst at Barbour ABI, said this week: ‘There is undoubtedly a hold-up in turning data centre plans into construction, but there is not one single cause. For those that are stalled, power can be a major problem.’
Shelley identified grid connection timelines, specialist labour shortages and long lead times for transformers and cooling equipment as compounding factors. He added that the pace of artificial intelligence (AI) development itself created a particular difficulty: ‘Power and cooling requirements can change significantly between planning and construction, forcing some developers back to the drawing board.’ His conclusion was direct: ‘The biggest challenge developers face is getting the power, the people and the right technology in place.’
Matt Evans, chief operating officer at trade organisation techUK, linked the demand surge directly to AI, cloud computing, storage and streaming, but cautioned that vacancy rates in data centres were close to an all-time low even as development stalled. Evans attributed the blockage to long grid connection times, high industrial electricity costs, and wider supply chain, skills and planning barriers. He also noted that non-viable speculative applications had inflated the published pipeline figures.
The Data Centre Alliance, the representative body for the UK data centre community, warned this summer that infrastructure delivery timelines risked lagging behind national AI ambition. Its recommendations included establishing a bespoke digital infrastructure planning framework, considering targeted and time-limited energy price incentives, and strengthening local planning authority resources. A senior executive at McLaren Construction separately called for a single minister to co-ordinate planning and construction across the sector.
Government has begun to respond. Business secretary Jonathan Reynolds announced last week that funding had been secured for a new data centre in Lanarkshire, backed by a £202 million guarantee from the National Wealth Fund. Reynolds said the investment was ‘proof that our AI Growth Zones are already playing their part in reindustrialising Britain and delivering good growth in every postcode.’ The Lanarkshire announcement will be watched as a test of whether public financial levers can accelerate a sector where private capital is ready but infrastructure constraints are not.
