Where deliverable grid capacity sits relative to Britain’s internet exchanges. Capacity close to a major exchange suits latency-sensitive colocation and inference; capacity far from one suits AI training and other workloads that tolerate distance.
| Area | Deliverable | Within 50 km | Sites ≥50 MW | Best suited to |
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| Area | Deliverable | Pipeline under 100 MW | Known MW | Without MW | Campuses ≥100 MW | Cancelled | Known pipeline / deliverable |
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Planned and under-construction sites from the Azraq sites database. Campuses of 100 MW or more usually connect to transmission, so they are counted apart from the distribution-scale comparison. MW is missing for many pipeline sites, so the ratio is a lower bound.
| Substation | Network | Area | Deliverable | Connectability | Major exchange | Nearest exchange |
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| Substation | Network | Area | Deliverable | Connectability | Major exchange | Nearest exchange |
|---|
Each substation is scored 0 to 100 as if a new data center were built there: its own deliverable capacity, how many substations are nearby, how much data center capacity is already built within 10 km and how far the nearest exchange is. Green is 80 and above, amber 60 to 79, red below 60, the same scale as every other power page; the (i) beside the column gives the weights. Substation dots on the map are coloured by free MW, not by score. Scores come from the live UK grid data and show once it loads. It is not a connection offer.
Exchange locations are PeeringDB facilities hosting an internet exchange with 10 or more member networks. A major exchange has 100 or more: LINX LON1, LINX LON2, LONAP and LINX Manchester. Distances are straight lines from each substation, not fibre route distance, and say nothing about fibre at the site itself.
The substation ranking and exchange distances on this page are a saved snapshot and do not yet include SSEN Distribution’s substations (central southern England, including Slough, and the north of Scotland). Their headroom is on the UK Grid Capacity page, and the pipeline table below includes SSEN’s two licence areas once the daily build has run.
SP Energy Networks publishes one headroom figure for a group of substations and repeats it on each substation in the group. This page counts each group once, at its first listed location, which removes repeated rows. Deliverable capacity is the published headroom, less accepted offers, capped by the grid supply point, as on the UK Grid Capacity page.
Latency-suited: at least half of an area’s deliverable capacity lies within 50 km of a major exchange. Training-suited: under 10%. Mixed: in between. These are screening labels, not a substitute for carrier quotes on route, diversity and cost.