Data Center Registry

Arsenal Data Site (Arconic Massena Operations)

Massena, St. Lawrence County, New York

ProposedNo reception on recordRecord updated September 21, 2026

Arsenal Data Site (Arconic Massena Operations) is a proposed data center in Massena, New York (St. Lawrence County), operated by Arconic Corporation (Apollo-owned). The record for this site rests on a single unverified source and should be read that way.

Every line on this page traces to a public source listed at the bottom. Where a figure was looked for and not found, the row says so. A blank is never a zero.

Facility record

Proposed

Operator: Arconic Corporation (Apollo-owned)
Facility type: Data center
Location: 45 County Route 42, Massena, St. Lawrence County, NY, 13662
Coordinates: 44.9528, -74.8830 (approximate)
Power capacity: Not established from a public source
Land: Not established from a public source
Investment: Not established from a public source
Announced: Not established from a public source
Utility: New York Power Authority (NYPA) / National Grid
Cooling: Not established from a public source
Water use: Not established from a public source
Jobs: Not established from a public source
Public subsidy: Not established from a public source
Community reception: No reception on record
Source confidence: Rumored: a single unverified source

Timeline from the record

Newest first. Record entries come from the filings and reports the registry cites. Coverage entries are headlines from publisher feeds we monitor daily, linked to the outlet; last checked September 14, 2026.

March 7, 2025
Proposed
Arconic Corporation filed three NYISO large-load interconnection requests (#1728 'Arsenal Data Site 250', #1729 'Arsenal Data Site 500', #1730 'Arsenal Data Site 1000'; 250/500/1,000 MW), POI Denniston Substation (NYPA), proposed in-service 03-2027 Source: St. Lawrence County Planning Office

Opposition and litigation at this site

Nothing on record as of September 21, 2026. No lawsuit, organized opposition, or contested hearing over Arsenal Data Site (Arconic Massena Operations) in Massena, St. Lawrence County, New York appears in the sources this registry tracks. That is an absence in our sources rather than a finding that none exists, and local opposition often predates any coverage a national dataset would pick up.

If you live near this site and something is happening that this page does not show, that is worth telling us. Send us the document and it goes in the record with the source attached. For sites where opposition is already established, see every contested site we track.

Power and water

NYISO queue lists NYPA as interconnecting utility and National Grid as affected transmission owner, POI Denniston Substation.

Notes on the record

Lead only: known from three NYISO large-load queue positions filed by Arconic Corporation in March 2025 (250/500/1,000 MW alternatives, not summed here), all at the Denniston/Dennison substation. No site plan, permit application or public announcement was found this session; a local report that Arconic wants to use excess plant space for a ~933 MW data center could not be fetched (nny360 rate-limited). Apollo Global Management owns both Arconic and Stream Data Centers. Coordinates are the OSM landuse centroid for Arconic Massena Operations, not a data-center parcel.

What the record does not establish, and the document that would

In every fight on our tracker the decisive fact came out of a public records request. These are the requests for this site.

Power capacity in megawatts
Cooling method and water use
Tax abatements or other public subsidy
Permanent jobs promised
Land area
How the community has received it

Which document closes each gap

Power capacity in megawatts: The utility's large load service agreement, the interconnection request in the grid operator's queue, or the electrical site plan in the permit file.
Cooling method and water use: The water service agreement, any groundwater appropriation permit, and the mechanical narrative in the site plan.
Tax abatements or other public subsidy: The abatement, PILOT, or development agreement approved by the county, city, or development authority, and the state's data center sales tax exemption certificate if one was issued.
Permanent jobs promised: The economic development application or incentive agreement, which usually states a job commitment and a clawback.
Land area: The rezoning application, the plat, or the deed recorded with the county.
How the community has received it: Planning commission and governing body minutes, public comment records, and any petition or lawsuit filed in the county.

Have one of these documents? Send it to us and we will add it to the record with attribution.

Other sites within 30 miles

Distances are between recorded coordinates, many of which are a city or county centroid, so treat them as approximate. Cumulative load on one utility and one aquifer is the question a planning commission rarely asks.

ZeroC / Petawatt Holdings Data Center Site (417 County Route 42) · Massena · ZeroC Data Centers LLC (majority-owned by Petawatt Holdings, Inc.)1 mi · Proposed · 200 MW
Pontoon Bridge Road Data Center (proposed) · Massena · American Data Center Partners LLC2 mi · Proposed
Coinmint (Massena East / former Alcoa Smelter) · Massena · Coinmint8 mi · Operating · 435 MW
North Country Collocation Services Massena Data Center (former Reynolds site) · Massena · North Country Collocation Services (NCCS)8 mi · Proposed · 635 MW · Contested

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Questions people ask about this site

Is there opposition to the Arsenal Data Site (Arconic Massena Operations) data center in Massena?

Has anyone filed a lawsuit over the Arsenal Data Site (Arconic Massena Operations) data center?

No lawsuit over Arsenal Data Site (Arconic Massena Operations) appears in the record we track as of September 21, 2026. Residents most often reach a lawyer over water supply, well drawdown, noise from cooling plant, property value, or a rezoning approved without the notice the ordinance required. If any of that is happening near this site, it is worth a review whether or not a case has been filed yet.

How much water does Arsenal Data Site (Arconic Massena Operations) use?

No water withdrawal figure for Arsenal Data Site (Arconic Massena Operations) is on record here. Water use is rarely published voluntarily; it usually surfaces through a utility service agreement or a state withdrawal permit, both of which are public records. We leave the number blank rather than estimate one.

Who operates Arsenal Data Site (Arconic Massena Operations), and how big is it?

Arconic Corporation (Apollo-owned) is the operator on record. No capacity figure is on record for this site.

How to cite this page

SueDataCenters.org Data Center Registry, "Arsenal Data Site (Arconic Massena Operations)," updated September 21, 2026, https://suedatacenters.org/data-centers/arconic-arsenal-data-site-massena-ny.

Facility data from Compute Atlas (E. Kubiak), version 1.34.0 (September 21, 2026), licensed CC BY 4.0, record https://www.compute-atlas.com/facilities/arconic-arsenal-data-site-massena-ny, retrieved October 1, 2026.

Corrections with a public source are welcome at the Compute Atlas record or through our contact page. The whole registry is available as CSV and JSON under CC BY 4.0.

Sources for this record

As compiled and cited by Compute Atlas, with our own reporting appended. Archived links are used where the original has moved.

1.St. Lawrence County Planning, LGC 2025 Planning & Zoning presentation: NYISO queue excerpt listing Arconic Corporation 'Arsenal Data Site 250/500/1000' (queue #1728 to 1730, IR 3/7/2025) · St. Lawrence County Planning Office · retrieved September 21, 2026
2.Data Centers in New York, 'Arsenal Data Site', Arconic Corporation, St. Lawrence, 933 MW planned · Cleanview · retrieved September 21, 2026
3.EPA RCRA profile, ARCONIC MASSENA OPERATIONS, 45 County Route 42, Massena NY 13662 (~2,700 acres) · US EPA · retrieved September 21, 2026 · original offline, no archived copy found

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