HELIOSOpen AI Infrastructure Observatory
Static snapshot. This site serves two different things: 1,853 data centres reported by OpenStreetMap contributors nationwide, and 13 sites Helios infers from Arizona parcel records, exported on July 29, 2026. The first is a map of what has been recorded; the second is an argued hypothesis with an evidence chain. This is a point-in-time export, not a live view. See meta.json or the methodology.

Essex County

County in MA · 1 data centres recorded in OpenStreetMap

Mapped facilities
1
on the map today
Floor area
0.00
km² across 1 buildings
Share of US load
5
MW, inferred upper bound
Water
0.01
million gal/day, inferred

When these appeared on the map

observed, not surveyed

Not enough history to draw a series.

What the grid here looks like

reported by OSM contributors
Substations
27
69 kV and above
Bulk substations
3
230 kV and above
Highest voltage
345
kV, present in this county
Generating capacity
1,088
MW across 57 plants

A facility drawing hundreds of megawatts connects at bulk transmission voltage, so the second figure matters more than the first: forty 69 kV yards are not a substitute for one 500 kV substation. 21 of the plants here carry no capacity tag, so the megawatt total is a floor rather than the region's output.

Proximity is not connection. Nothing here shows that any facility has contracted power from any of these substations. That gets settled in interconnection filings Helios cannot read, and in several regions those queues now run for years. A county showing no substations may have none mapped rather than none standing.