Data centres guzzle roughly 2.5% of Britain’s electricity today, a share the National Grid expects to double by 2030. That’s the equivalent of adding another 1.5 million homes to the grid, every year, for the next six years. And until now, those vast server farms have paid far less than households for the network capacity they use.
Ofgem wants to change that. The regulator is consulting on a new charging structure that would make datacentres pay more for their grid connections, as reported by Computing UK. The proposal is buried in a technical consultation on transmission network use of system (TNUoS) charges, but its implications for household energy bills are anything but technical.
What it means for your energy bill
Network charges account for roughly a quarter of a typical household electricity bill, about £180 a year on a standard variable tariff. Ofgem has been under pressure from consumer groups to stop cross-subsidising large industrial users, who often negotiate lower connection fees despite drawing enormous loads.
If datacentres start paying a fairer share, the cost burden on households could ease. The catch is timing: any reduction in domestic bills would be gradual and small, perhaps £10–20 a year per household by 2030, based on Ofgem’s initial modelling. That’s not nothing, but it won’t transform a household budget. What it could do, however, is slow the rate at which network costs rise as the grid decarbonises.
Who qualifies, and who doesn’t
The proposal targets datacentres with connection capacities above 5 MW, roughly the size that serves a large hyperscaler campus or a colocation facility servicing multiple tenants. Smaller server rooms in office blocks or edge computing sites below that threshold would not be affected.
Ofgem’s logic is simple: large datacentres are concentrated in a few locations (Slough, the M4 corridor, parts of London) where the grid is already strained. Their demand growth is forcing network upgrades that all bill-payers currently fund. The regulator wants those costs assigned to the users causing them, a principle it already applies to other large industrial consumers like steelworks and chemical plants.
Yet the datacentre industry argues the move could deter investment. The UK is Europe’s largest datacentre market, hosting hyperscalers from AWS to Microsoft. If connection costs rise, some projects may shift to Ireland, the Nordics, or Spain, countries with lower electricity prices and more available renewables.
The EPC and home upgrade angle
For homeowners considering solar panels, a heat pump, or better insulation, the datacentre charging debate matters indirectly. Every pound the grid spends reinforcing connections for datacentres is a pound not spent on decarbonising the distribution network, the local wires and transformers that bring power to your street.
If datacentres pay their own way, more network capacity is freed for domestic renewables. That could make it cheaper and faster to connect a new solar array or heat pump, especially in areas where the local grid is already near capacity. The Energy Saving Trust notes that grid constraints are a growing barrier to heat pump adoption in some regions; easing that bottleneck would help.
Ofgem’s consultation runs until early 2025. Homeowners don’t need to submit responses, but they should watch the outcome. If the regulator pushes through higher datacentre charges, the long-term effect is likely to be slightly lower network costs for households, and a grid that’s better positioned to support the electrification of heat and transport.
What you can do now: check your own electricity tariff. If you’re on a standard variable rate, you’re paying the full network charge. Fixed tariffs sometimes lock in lower network cost projections. And if you’re planning an eco upgrade, ask your installer whether local grid capacity is a constraint, they can check with the Distribution Network Operator (DNO) for your area. The answer may depend, in part, on how this consultation lands.
Frequently Asked Questions
Not immediately, and not by a large amount. If implemented, the change would reduce upward pressure on network charges over several years, likely saving a typical household £10–20 annually by 2030. The bigger impact is on grid capacity for domestic renewables and heat pumps.
The consultation closes in early 2025. Ofgem typically publishes a decision within six months of a consultation closing, so a final ruling could come by mid-2025. Implementation would be phased over multiple years to allow datacentres to adjust.
