UK Data Centres Face Multi-Million Pound Grid Deposits as Connection Queue Balloons

Ofgem proposes upfront fees of £237,500 to £712,500 per megawatt to filter speculative data centre projects from Britain's electricity connection queue, which has tripled in under a year.

The UK's energy regulator Ofgem has proposed new measures requiring data centre developers to pay substantial upfront deposits before connecting to the national electricity grid — a move that could see individual projects paying hundreds of millions of pounds in refundable fees.

The proposal, announced 29 July, would charge developers between £237,500 and £712,500 per megawatt of requested capacity. For a large-scale data centre requiring 1 gigawatt of power, that translates to a deposit of up to £712 million — refundable only if the project reaches completion.

The intervention comes as Britain's grid connection queue has more than tripled in under a year, surging from 41 GW to 125 GW of requested capacity. That figure now dwarfs the UK's peak electricity demand of approximately 46 GW. According to Ofgem, 315 data centre projects are currently waiting in the queue, representing roughly 73 GW alone.

"The amount of electricity capacity being requested by projects seeking to connect to the grid has risen sharply," Ofgem stated, describing the surge as driven in part by speculative applications. The regulator said the deposits — which could also take the form of letters of credit or bonds — are designed to ensure that "consumers should not bear the risks created by speculative projects taking up space in the system."

The proposal follows growing local opposition to data centre construction across the UK. Residents near planned sites have raised concerns about noise, electricity consumption, and the large volumes of water used to cool high-performance computing chips. There are currently 564 data centres operating in the UK, with 24 more in planning in Scotland alone, where renewable energy supply makes the region particularly attractive to developers.

Energy minister Michael Shanks backed the move, saying the plans would "help ensure that viable connection-ready projects can get going and not be held up by speculative applications." The consultation runs until 16 September.

Sources: BBC News, The Guardian