## Highlights Great Britain's National Energy System Operator (NESO) now administers an interconnection queue holding **600 GW of requested load capacity**—a figure that dwarfs the UK's entire installed generation base of approximately 76
## Highlights
Great Britain's National Energy System Operator (NESO) now administers an interconnection queue holding **600 GW of requested load capacity**—a figure that dwarfs the UK's entire installed generation base of approximately 76 GW and signals a multi-year wait for new large loads seeking grid connection.
London scores **16.9 on the DC Hub excess-power index**, the lowest of any tracked global market, while carrying a 77.8% constraint ratio. The combination of low headroom and deep queue position means a 100+ MW hyperscale facility applying for transmission service today faces an energization timeline stretching into 2030 or beyond.
## What It Means for Site Selection
For capacity planners evaluating UK sites, the queue depth is now the dominant capex variable—not land cost, not fiber, not incentives. A five-year delay to power-on translates to five years of debt service on a fully capitalized shell, five years of foregone revenue, and five years of risk that the competitive landscape shifts before the first rack goes live.
The contrast with North American build corridors is stark. **Midland–Odessa, Texas** (ERCOT) posts an 85.7 excess score with 22.8% constraint and sub-18-month interconnection paths. **Oklahoma City** (SPP) scores 76.5 with 47.1% constraint and similar timelines. Both markets offer transmission headroom measured in gigawatts, not decades.
## The Grid-Policy Implication
NESO's queue is a policy artifact, not a physical constraint. The UK's transmission approval process layers planning consent, environmental review, and local opposition into a serial workflow that assumes incremental load growth. Hyperscale AI loads—lumpy, urgent, and measured in hundreds of megawatts—break the model. The 600 GW figure is a queue of requests, not a queue of projects; most will never energize, but all must wait in line.
For developers, the lesson is simple: **queue position is now a line-item risk**. A site with planning permission but no grid position is a land bank, not a data center. Price the delay into the pro forma, or build where the power is already waiting.
Source: NESO Transmission Entry Capacity Register (https://www.neso.energy/data-portal/transmission-entry-capacity-tec-register). DC Hub tracks live power and queue metrics across 320+ markets, updated daily.
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