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AI data centres could push up UK energy bills further

Building the facilities needed for artificial intelligence is set to cost between £16 million and £22 million per megawatt, adding pressure on the grid and household supply.

1 October 2026 · Eleanor Whitfield · Fuse Energy

Rising costs for new infrastructure

The UK is seeing rapid growth in AI-optimised data centres. These facilities need specialised cooling and high-density power setups that push build costs well above those of standard sites. The extra demand also means data centres already take around 5.8% of national electricity, close to the level that often triggers public and political resistance.

Water, carbon and grid strain

Cooling these centres uses large volumes of drinking water. Water UK figures show current daily use in England at 6.6 million litres, with the potential to triple to 19.8 million litres by 2030 if capacity grows as expected. Ofgem has proposed new connection fees and progress rules to manage the load on the network.

We have already looked at how similar demand spikes could affect bills on both sides of the Irish Sea in AI Data Centres Set to Match 100,000 Homes in Power Use.

What this means for households

Higher overall demand makes it more important for homes to cut waste and lock in competitive tariffs. Switching suppliers remains one of the simplest steps available. Fuse Energy is highlighting its focus on renewables and flexible pricing as one route to keep costs down while the grid adapts.

The company argues that scaling clean generation and modernising transmission will be essential if the UK wants to support both new digital industries and everyday household use without repeated price shocks.

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