Why AI data centers aren't getting built: Bernstein says 35% of the US pipeline is credible
The Financial Times reported on October 18, 2026 that at least 47 large US data center projects were delayed, withdrawn or blocked this year, and that Bernstein considers only about 35% of the planned US pipeline credible. The same day, Microsoft was reported to have exited Nscale's UK site, where power may not arrive until the 2030s. The bottleneck is grid, permits, equipment and local opposition, not chips
The three lines
- Scale — 47+ large US projects stalled in 2026; ~35% of pipeline credible (Bernstein)
- Case — Microsoft exits Nscale's Essex site; grid power not expected before the 2030s
- Fallout — debt-funded AI infrastructure reprices; questions for Nscale's IPO
Key questions
- Why are data center projects delayed
- **Four bottlenecks: grid, permits, equipment, opposition.** | Bottleneck | Detail | |---|---| | Grid | Multi-year interconnection queues | | Permits | Environmental and zoning reviews | | Equipment | Transformer and turbine shortages | | Opposition | Moratorium talk in some states |
- Microsoft Nscale Loughton
- **Microsoft reportedly left as anchor tenant (Telegraph, Oct 18).** | Item | Detail | |---|---| | Site | Loughton, Essex | | Plan | ~23,000 Nvidia GB300 chips | | Problem | Power not expected until 2030s | | Reason for exit | Not disclosed |
- Bernstein data center 35 percent
- **Bernstein's estimate of the share of the planned US pipeline that is credibly executable.** Its definition and method were not published in the coverage reviewed.
The AI build-out is running into land and electricity. A Financial Times investigation on October 18, 2026, citing tracker RegLayer, counted at least 47 large US data center projects delayed, withdrawn or blocked this year, a count RegLayer calls conservative. Bernstein analysts estimate only about 35% of the planned US pipeline is credible.
The same day, the Telegraph reported Microsoft had pulled out as anchor tenant of Nscale's first British data center.
1. What is stalling
| Bottleneck | Effect | Example |
|---|---|---|
| Grid connection | Years-long queues | Nscale Essex: power in the 2030s |
| Permitting | Environmental, zoning reviews | Google's Finland site halted in September |
| Equipment | Transformer and turbine shortages | Industry-wide |
| Local opposition | Power bills, water, noise | Moratorium debates in Louisiana, Oklahoma, Missouri |
| Financing | Costly debt | CoreWeave bonds yielding 15% |
2. Microsoft and Nscale
| Item | Detail |
|---|---|
| Site | Loughton, Essex |
| Plan | ~23,000 Nvidia GB300 chips, billed as the UK's largest AI supercomputer |
| Public customer | Microsoft only |
| Power | Not expected before the 2030s |
| Nscale | "Committed to the project and the UK," exploring other power and sites |
| Norway site | 6.4MW of a planned 30MW running, six months late |
Nscale filed for a New York listing last month, seeking up to $3 billion. Its filing shows Microsoft and Anthropic account for about 85% of contract value; Anthropic agreed in August to spend $45 billion over six years.
3. Following the money
| Indicator | Value | When |
|---|---|---|
| US AI infrastructure plans | ~$10 trillion (FT) | Oct 2026 |
| Credible share | ~35% (Bernstein) | Oct 18 |
| CoreWeave shares | Down 25%+ in a month | Oct 16 |
| Philadelphia Semiconductor Index | 8 straight declines, longest since 2008 | Oct 16 |
Two-thirds uncertainty cuts two ways: inflated demand forecasts for chip and equipment makers, and shaky repayment schedules for developers who borrowed to secure land. For Korea, whose SK hynix and Samsung supply most HBM memory, the pace of real construction matters more than headline plans. Nvidia's Jensen Huang said on October 16 that the selloff "will pass."
4. What remains unconfirmed
- How Bernstein defined "credible."
- Why Microsoft left.
- Whether Nscale's IPO timing changes.
Sources
- Techmeme (citing the Financial Times) — 47+ US data center projects delayed; Bernstein ~35% credible (2026-10-18)
- Crypto Briefing — Only 35% deemed credible: Bernstein (2026-10-18)
- The Next Web — Microsoft reportedly quits Nscale's UK data centre (2026-10-18)
- Yahoo Finance — Microsoft axes AI deal in setback for UK data centre pioneer