Microsoft Exits Nscale's Loughton AI Site Over a Grid Delay

Microsoft has ended its agreement for a planned AI data center in Loughton, Essex, after the site's expected grid connection slipped into the 2030s. The developer is Nscale, a company that grew out of Arkon Energy, which built sites for bitcoin mining. CoinDesk reported on October 19 that the local grid operator told Nscale the site may not have enough power for about a decade.

I follow this story because it sits right where bitcoin mining and AI hosting meet: land, a power connection and the date when the electricity actually shows up.

What Happened

According to Data Center Knowledge, a Microsoft spokesperson confirmed the termination. Nscale announced Loughton in 2025 as a 50 MW campus that could scale to 90 MW. The plan called for 23,040 Nvidia GB300 GPUs serving Microsoft Azure, with operations expected to begin in early 2027.

Both CoinDesk and Data Center Knowledge cite reporting by the Guardian that UK Power Networks, which runs the local grid, told Nscale it could not supply enough electricity until the early to mid 2030s. Silicon UK reported that the connection had originally been expected by the end of 2026.

Data Center Knowledge reported that Nscale said it remains committed to the site and is exploring alternative power sources and other expansion options in the UK. Nscale also said its other Microsoft contracts are unaffected. Neither company has disclosed the financial effect of the termination, according to the same report.

Where Nscale Came From

CoinDesk describes Nscale as a bitcoin mining offshoot. Its founder, Josh Payne, used Arkon Energy's experience securing land and power for mining sites to build a business selling computing capacity to AI companies.

That path is common. Many public miners have spent the last two years announcing AI and high performance computing deals for sites that began as mining facilities. CoinDesk cited a March report that public miners had announced more than $70 billion in AI and high performance computing contracts. It also cited CoinShares figures showing more than 4 gigawatts of AI capacity under contract across the miners CoinShares tracks, with only about 550 megawatts billing customers.

Why Power Timing Matters So Much

In bitcoin mining, the power connection is the business. A site with machines on racks and no energized feed produces nothing. The same is true for an AI data center, only the money involved per megawatt is far larger. CoinDesk cited estimates of $8 million to $15 million per megawatt for AI ready facilities, compared with roughly $700,000 to $1 million per megawatt for bitcoin mining.

Interconnection is usually the slowest piece of any large load project. A developer controls land, buildings and equipment orders. The utility or grid operator controls when the substation work is done and when capacity is released. When that date moves, every later date moves with it, including customer delivery dates written into hosting or colocation agreements.

I have written before about the basics of power at ASIC sites and about power contract disputes in bitcoin mining. Loughton is a reminder that the grid connection date is a separate risk from the power contract itself.

What Participants Have Said

Data Center Knowledge collected several analyst comments on the termination.

• Alex Cordovil, research director at Dell'Oro Group, said: "Contracted capacity is meaningless until it's energized capacity." He also said grid operators can revise connection commitments by six months or a year, and sometimes longer, and that the project is not a sign that AI infrastructure demand is weakening.
• Neil Osnato, founder of Persistence Analytics Group, said the problem is not necessarily that AI demand disappears, but that capital can be committed before the assumptions behind its recovery are proven.
• Owen Rogers of Uptime Institute Intelligence said a backlog only becomes cash if the provider can build and power capacity on time.

On the policy side, CoinDesk reported that Ofgem says data center projects have requested UK grid connections totaling about 73 gigawatts of demand, and that the regulator is weighing tougher rules because some applicants may not build at all.

Contract Value Versus Energized Capacity

Data Center Knowledge reported figures from Nscale's September 2026 IPO filing: $103.4 billion in active and contracted total contract value as of August 31, 2026, against $2.6 billion in active contract value. The filing said Microsoft agreements provide for payments of up to $43.8 billion through December 2033, subject to delivery and service availability requirements.

That gap between contracted and active value is the same gap CoinShares described across public miners. It is also familiar to anyone who reads bitcoin mining hosting agreements, where delivery dates, energization milestones and termination rights are usually written around the assumption that power arrives when planned.

What the Industry Is Watching

A few open questions stand out to me as this develops.

• Whether Nscale finds alternative power for Loughton, and on what timeline.
• Whether other AI conversion projects, including those on former or current bitcoin mining sites, report similar interconnection delays in their filings.
• How Ofgem's review of the UK connection queue changes the timing for projects that are ready to build.
• How miners that have announced AI contracts describe energization dates and milestones in upcoming quarterly reports.

For bitcoin miners weighing an AI conversion, the reporting on Loughton puts one variable in plain view. The contract can be signed, the chips can be ordered and the site can be cleared, and the start date still depends on when the grid can deliver the power.