Energy has become the defining delivery risk for UK data centre development. Grid capacity, connection timescales and regulatory reform are no longer technical considerations to be addressed later. Instead, they have become central to site selection, planning and investment decisions from the outset.

The challenge is reflected in the UK’s electricity connection queue. When the latest application window closed in March 2025, the National Energy System Operator (NESO) identified around 125 GW of connection requests, equivalent to approximately 1.7 times the UK’s total grid capacity of around 75 GW. Data centres represented a significant proportion: around 140 projects  sought  transmission connections, equating to approximately 50 GW of capacity.

While not all of these schemes will be delivered, the level of oversubscription illustrates why reforms are needed to distinguish credible developments from speculative applications.

A changing approach to grid connections

Under an emerging framework, the UK is moving away from a purely “first come, first served” approach towards a system that prioritises projects which are both ready and needed.

Connection rights will increasingly depend on developers demonstrating tangible progress, including land control, defined site boundaries, planning advancement, financial backing and a clear need for capacity. Projects that fail to meet these criteria may remain in a holding position without a firm connection date or price, while the wider Demand Connections Reform programme seeks to curate the queue and connect viable demand more efficiently.

With application windows unlikely to reopen before late 2026, developers have an opportunity to strengthen technical due diligence, refine power requirements and develop more robust commercial strategies ahead of the next allocation round.

Ofgem’s latest proposals

Ofgem has also recently proposed requiring large data centre developers to provide substantial financial commitments in order to secure grid connections.

The proposals recognise the increasing pressure on the electricity network and seek to ensure that projects requesting significant capacity have both the intent and ability to proceed. In many respects, this builds on reforms already introduced for renewable energy connections, placing greater emphasis on projects demonstrating genuine progress and a realistic prospect of delivery.

Extending similar principles to large demand connections such as data centres is a logical next step in the UK’s broader programme of grid reform. However, striking the right balance will be critical. While financial commitments could help discourage speculative applications and free up capacity, they must also avoid creating unnecessary barriers to investment in a sector that remains strategically important to the UK’s digital economy.

Power as a competitive advantage

Securing a grid connection is only part of the equation. Electricity pricing, influenced by wholesale markets as well as transmission, distribution and system balancing costs, has become an increasingly important factor in development viability.

Consequently, energy strategy is a commercial differentiator. Developers must demonstrate a credible route to securing power and also a financeable long-term energy strategy capable of supporting operational competitiveness.

Looking ahead, development is likely to become increasingly concentrated around established hyperscale locations with proven infrastructure. As the market evolves, energy is no longer simply another utility requirement; it has become the gatekeeper to UK data centre delivery.

Further information

Contact Lydia Brissy or Phil Pearson 

Queue discipline: Separating signal from noise in UK power access