The energy regulator, Ofgem, has revealed that around 140 data centre projects have applied for connections to the national grid, with a combined peak demand of 50 gigawatts. By comparison, Britain’s recent peak electricity demand stood at 45 gigawatts.
The scale of the applications has prompted concern among some MPs and environmental groups, who say the potential rise in energy consumption should trigger a broader public discussion about the impact on climate targets and household energy costs.
The proposed capacity is significantly higher than previous government assumptions used in planning for a clean power grid by 2030, a target set by Energy Secretary Ed Miliband. The new figures suggest demand from data centres could be around five times greater than earlier forecasts.
Prime Minister Keir Starmer has pledged to expand AI infrastructure across the UK to stimulate economic growth. Planning reforms are being introduced to classify data centres as projects of national importance, making it easier for them to secure approval.
However, critics warn that rapid expansion could strain the electricity grid, increase emissions if not powered by clean energy, and place additional pressure on water supplies. Large facilities are known to require significant cooling systems, which can consume substantial amounts of water.
According to Ofgem, the volume of grid connection requests from large energy users exceeds even the most ambitious demand projections. The regulator said about 71 of the proposed projects, representing roughly 20 gigawatts of capacity, are considered mature developments where investors have already taken final decisions.
While industry sources suggest not all projects will ultimately proceed, Ofgem indicated that many are expected to be prioritised for grid access.
Some MPs have argued that the development of data centres should not occur without a wider national discussion about energy supply, affordability and environmental impact. Concerns include whether connection costs will be borne by developers or passed on to consumers through energy bills.
Ofgem said it is exploring options that would allow developers to fund their own grid connections in order to speed up deployment and reduce pressure on the system. The regulator is also considering reforms to the connection queue, including possible fees to ensure only viable projects proceed.
Clean energy advocates warn that competition for grid capacity could delay renewable energy projects, potentially slowing progress towards emissions reduction targets.
The government has defended its approach, stating that data centres are essential to the modern economy and digital growth. It says AI growth zones are being developed in regions with new clean power infrastructure and that it is working with regulators and network operators to expand grid capacity.
Industry representatives argue that data centres are central to economic development but stress that timely access to electricity is critical. Some have welcomed the idea of introducing fees or deposits to prioritise committed projects, provided the system is fair and transparent.
As the UK accelerates its artificial intelligence strategy, questions remain over how the country will balance technological expansion with energy security, affordability and climate commitments.
