OpenAI Pauses UK Stargate Data Center Project: Energy Costs Too High, $500B Vision Falls Short

OpenAI has officially paused its Stargate data center project in the UK, according to a report by Bloomberg on April 9. Excessive energy costs are cited as the main reason. The flagship facility, originally planned to come online in Q1 2026, has not been started yet, dealing a major setback to UK Prime Minister Keir Starmer’s AI-centered economic growth strategy.

The 8,000-chip commitment falls through

The UK Stargate plan was first announced in September 2025, in partnership between OpenAI and UK data center operator Nscale. It was expected to build a large-scale data center at Cobalt Park in Tyneside, capable of housing roughly 8,000 Nvidia AI processors. The project is part of OpenAI CEO Sam Altman’s global Stargate initiative, which was jointly announced with U.S. President Donald Trump at the White House in January 2025. The total scale reaches $500B.

However, with the Q1 2026 deadline already passed, the facility has not only failed to go live—it has not even started construction. Both OpenAI and Nscale have declined to publicly comment and have not provided a revised timeline.

Energy and the regulatory environment are the biggest obstacles

Bloomberg’s report says that the UK’s energy costs are a key factor behind OpenAI’s decision to pause the plan. OpenAI said it will continue moving forward with the UK project under “appropriate conditions,” but did not specify what those conditions are.

This is not the first time the Stargate project has faced delays. Earlier, a Texas expansion plan in collaboration with Oracle was also put on hold in early 2026, and major funding backer SoftBank still has not finalized the definitive terms. According to an analysis by climate research firm Sightline Climate, as many as 50% of major data center projects worldwide are currently behind schedule, largely due to planning difficulties and insufficient energy supply.

Real-world test for the UK’s AI ambitions

The UK government had previously viewed the Stargate project as an important milestone to demonstrate the country’s leadership in AI. OpenAI also recruited former Conservative Party finance minister George Osborne to lead its international expansion efforts, while Nscale (valued at $15 billion, with former UK deputy prime minister Nick Clegg serving as a director) has also been seen as a key driver of the UK’s AI infrastructure.

However, a spokesperson for the advocacy group Foxglove, Tom Hegarty, criticized it: “Sam Altman’s flagship Stargate UK project is, so far, just a press release from eight months ago.”

In response, a UK government spokesperson said that ministers are still focused on creating a favorable investment environment and continue to work with OpenAI and other AI companies to strengthen the UK’s compute capabilities. But as OpenAI has clearly listed energy costs as the primary reason for the pause, the UK may need to make substantive adjustments to energy policy to once again attract investments of this kind in large-scale AI infrastructure.

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