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.

Franklin County

County in OH · 32 data centres recorded in OpenStreetMap

Mapped facilities
32
on the map today
Floor area
0.45
km² across 29 buildings
Share of US load
488
MW, inferred upper bound
Water
1.06
million gal/day, inferred
3 of these 32 are not mapped as buildings, so no power figure is estimated for them. 2 are campus boundaries covering 0.29 km² of land, and 1 is a site mapped as under construction. The megawatt figure above divides a national total by building floor area, and the area of a land parcel is not floor area. A site still being built consumed none of the electricity that total measures. Both are counted here and left out of the estimate rather than folded into it, so this region's load is understated by however much those represent.

When these appeared on the map

observed, not surveyed
01632201620182019202020212022202320252025
Data centres recorded in OpenStreetMap at the end of each month. The hatched stretch is before 2017-01, when telecom=data_center was not yet in common use — the near-zero readings there describe the tag, not the country. This is a count of what has been mapped, and OpenStreetMap carries no construction dates.

What the grid here looks like

reported by OSM contributors
Substations
65
69 kV and above
Bulk substations
6
230 kV and above
Highest voltage
345
kV, present in this county
Generating capacity
3
MW across 15 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. 14 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.

Largest named mapped records

by mapped area
NameOperatorMapped asMapped area m²Share MWFirst mapped
Google Lockbourne, OHGoogleUnder construction1,065,016—2024-09-09
Amazon AWS: Hilliard Data CenterAmazon Web Services us-east-2 datacenterCampus boundary239,550—2016-12-16
STACK New Albanynot recordedCampus boundary52,331—2023-11-24
GoogleGoogleBuilding26,93029.52024-02-19
Google NBY-6GoogleBuilding26,71729.32025-05-13
Google NBY-5GoogleBuilding26,66429.22025-05-13
Google NBY-4GoogleBuilding26,64529.22024-02-19
Amazon Web ServicesAmazon Web ServicesBuilding20,49322.52024-02-19
Amazon Web ServicesAmazon Web ServicesBuilding20,24622.22025-05-13
Amazon Web ServicesAmazon Web ServicesBuilding19,88921.82025-05-13
Amazon Web ServicesAmazon Web ServicesBuilding19,77421.72025-05-13
Amazon Web ServicesAmazon Web ServicesBuilding19,61721.52025-05-13
Amazon Web ServicesAmazon Web ServicesBuilding15,87917.42021-08-22
Amazon Web ServicesAmazon Web ServicesBuilding15,03316.52023-06-12
Amazon Web ServicesAmazon Web ServicesBuilding15,02816.52023-06-12
Amazon Web ServicesAmazon Web ServicesBuilding14,78316.22023-06-12
Amazon Web ServicesAmazon Web ServicesBuilding14,09415.42023-06-12
Amazon Web ServicesAmazon Web ServicesBuilding14,00815.32023-06-12
Amazon Web ServicesAmazon Web ServicesBuilding13,95515.32023-06-12
Amazon Web ServicesAmazon Web ServicesBuilding13,22014.52021-08-22
Amazon Web ServicesAmazon Web ServicesBuilding12,42213.62021-08-22
Amazon Web ServicesAmazon Web ServicesBuilding12,24313.42023-06-12
TJX Corporate Technonot recordedBuilding9,53910.52024-12-27
Compugen New Albanynot recordedBuilding4,1114.52024-12-27
Compugen New Albanynot recordedBuilding2,9943.32024-12-27
Amazon Web ServicesAmazon Web ServicesBuilding1,3431.52024-02-19

“First mapped” is when OpenStreetMap recorded the facility, not when it was built — OpenStreetMap carries no construction dates. Mapped area means a building floor plate, campus boundary, or construction polygon according to the “Mapped as” column; those quantities are never added together. The megawatt column appears only for buildings and is their floor-area share of a reported national total, not a measurement.