IN Brief:
- Ofgem is consulting on refundable commitment fees for large data centre connection offers.
- The proposed charge ranges from £237,500 to £712,500 per megawatt.
- Additional milestones would assess financial capability, commercial maturity, and procurement progress.
Ofgem has proposed commitment fees and additional development milestones for large data centre projects entering Britain’s electricity connections queue.
The regulator has opened a consultation on a Data Centre Commitment Fee that would be payable when a developer accepts a connection offer. The charge would be refunded when the project reaches energisation but forfeited if it leaves the queue early.
The proposed range is £237,500 to £712,500 per megawatt, which Ofgem estimates at approximately 2.5% to 7.5% of average project costs. A 100MW application would therefore carry a commitment of between £23.75 million and £71.25 million.
Demand connection applications have increased from 41GW to 125GW in less than a year, with data centre projects accounting for at least 80GW of the total. Overlapping, immature, or speculative applications can occupy capacity and distort assumptions used for network planning.
Alongside the fee, Ofgem proposes data centre specific milestones covering financial capability, commercial maturity, and procurement progress. Applicants would have to provide evidence that land, finance, equipment, delivery planning, and customer requirements are moving towards construction.
The proposals form part of wider connection reforms intended to move viable projects forward and remove developments that cannot meet agreed delivery requirements. Ofgem reports that earlier changes have already accelerated 7.8GW of projects by an average of six years.
Demand applications become a system planning risk
Connection queues have traditionally been associated with renewable generation, but large demand projects now create a comparable planning problem. Data centres can require hundreds of megawatts at one location and may pursue several possible sites before reaching an investment decision.
Network operators must assess each application against substation capacity, transmission boundaries, fault levels, voltage performance, reinforcement requirements, and the timing of other generation and demand projects. A queue containing uncertain demand can reserve capacity that more advanced developments might otherwise use.
Financial commitments can test project maturity, although the outcome will depend on how the charge is calibrated. A low fee may be absorbed as a routine development cost, while a disproportionately high charge could deter viable schemes or favour only the largest developers.
Refunding the fee at energisation links the commitment to completed delivery, but the period between offer acceptance and connection may extend across several years. Capital could remain tied up while planning, land acquisition, equipment procurement, and network works progress.
The treatment of delays outside a developer’s control will require precise rules. Planning appeals, network reinforcement, equipment shortages, or changes imposed by the system operator can affect delivery even when the applicant continues to meet its own obligations.
Data centre demand is rarely uniform across the development period. Campuses are often built in phases, with initial energisation covering part of the eventual connection capacity and later buildings following over several years.
Milestones must distinguish phased delivery from capacity that is unlikely to be used. Network operators will also need sufficiently reliable demand profiles to model voltage, thermal loading, contingency conditions, and reinforcement accurately.
Equipment lead times add another constraint because high voltage transformers, switchgear, protection systems, uninterruptible power supplies, busways, cooling equipment, and standby plant may need to be ordered well before energisation.
Procurement evidence can demonstrate maturity, but developers may be reluctant to place major orders until connection dates, planning approval, and customer commitments are sufficiently secure. A milestone regime that demands firm orders too early could transfer excessive risk into the supply chain.
Concentrated data centre development is also increasing attention on voltage stability, power quality, and the interaction between large electronic loads and constrained networks.
Connection reform cannot replace physical reinforcement. National Grid is already pursuing £4.5 billion of transmission investment, while additional substations, lines, cables, reactive power equipment, generation, and system services will be required as genuine demand grows.
Removing weak applications may release capacity and improve sequencing, but a more accurate queue does not create new network capacity by itself. Development milestones and infrastructure investment must advance together.
The consultation will determine how fees, evidence requirements, exemptions, exit conditions, and phased projects should be treated. The regime will need to remove applications that are unlikely to proceed without creating another administrative obstacle for developments that are ready to invest.
