Data Center Registry

ZeroC / Petawatt Holdings Data Center Site (417 County Route 42)

Massena, St. Lawrence County, New York

ProposedNo reception on recordRecord updated September 21, 2026

ZeroC / Petawatt Holdings Data Center Site (417 County Route 42) is a proposed data center in Massena, New York (St. Lawrence County), operated by ZeroC Data Centers LLC (majority-owned by Petawatt Holdings, Inc.). The public record puts it at announced January 2025, 200 MW planned, 14 acres.

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: ZeroC Data Centers LLC (majority-owned by Petawatt Holdings, Inc.)
Facility type: Data center
Location: 417 County Route 42, Massena, St. Lawrence County, NY, 13662
Coordinates: 44.9530, -74.8600 (approximate)
Power capacity: 200 MW planned
Land: 14 acres
Investment: Not established from a public source
Announced: January 2025
Utility: Massena Electric Department (MED)
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: Reported by at least one credible outlet or filing

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.

February 20, 2025
Proposed
Massena Town Planning Board approved (4-0) the site plan for a ~$30M substation at 417 County Route 42 intended to serve a future data center; applicant said the site is 'currently a 200 Megawatt site' and would start construction within 60 days of approval Source: Town of Massena

Opposition and litigation at this site

Nothing on record as of September 21, 2026. No lawsuit, organized opposition, or contested hearing over ZeroC / Petawatt Holdings Data Center Site (417 County Route 42) 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

Applicant told the planning board the substation would sit in MED service territory, interconnecting via the Dennison 115 kV substation (NYISO queue #1213/#1731).

Notes on the record

Site preparation (brush clearing) and a ~$30M substation were approved in Feb 2025 to hold a NYISO queue position; the deed is in ZeroC Data Centers' name with Petawatt as majority shareholder. Applicant estimated a ~900,000 sq ft building and an employment ratio of 40 to 60 people per 100 MW, and offered to guarantee no cryptocurrency mining. Two containers of crypto mining were on the parcel at the time. NYISO queue shows a 200 MW request (#1213, 2021) and a later 300 MW request (#1731, March 2025) at the Dennison 115 kV substation. No building application found this session. Coordinates are a road-level geocode of County Route 42 near Dennison Road, not a confirmed parcel point.

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.

Cooling method and water use
Tax abatements or other public subsidy
Permanent jobs promised
How the community has received it

Which document closes each gap

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.
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.

Arsenal Data Site (Arconic Massena Operations) · Massena · Arconic Corporation (Apollo-owned)1 mi · Proposed
Pontoon Bridge Road Data Center (proposed) · Massena · American Data Center Partners LLC3 mi · Proposed
Coinmint (Massena East / former Alcoa Smelter) · Massena · Coinmint6 mi · Operating · 435 MW
North Country Collocation Services Massena Data Center (former Reynolds site) · Massena · North Country Collocation Services (NCCS)7 mi · Proposed · 635 MW · Contested

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Questions people ask about this site

Is there opposition to the ZeroC / Petawatt Holdings Data Center Site (417 County Route 42) in Massena?

Has anyone filed a lawsuit over the ZeroC / Petawatt Holdings Data Center Site (417 County Route 42)?

No lawsuit over ZeroC / Petawatt Holdings Data Center Site (417 County Route 42) 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 ZeroC / Petawatt Holdings Data Center Site (417 County Route 42) use?

No water withdrawal figure for ZeroC / Petawatt Holdings Data Center Site (417 County Route 42) 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 ZeroC / Petawatt Holdings Data Center Site (417 County Route 42), and how big is it?

ZeroC Data Centers LLC (majority-owned by Petawatt Holdings, Inc.) is the operator on record. Capacity on record is 200 MW. The site is recorded at 14 acres.

How to cite this page

SueDataCenters.org Data Center Registry, "ZeroC / Petawatt Holdings Data Center Site (417 County Route 42)," updated September 21, 2026, https://suedatacenters.org/data-centers/petawatt-zeroc-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/petawatt-zeroc-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.Massena Town Planning Board minutes, 2025-02-20, Site Plan Review #2: ZeroC Data Centers LLC & Petawatt Holdings, Inc., 417 County Route 42 (Tax Map 10.001-1-7.21) · Town of Massena · retrieved September 21, 2026
2.Land clearing underway for new Massena data center substation (Petawatt Holdings, County Route 42, 14-acre parcel) · Watertown Daily Times / NNY360 via Yahoo News · retrieved September 21, 2026
3.St. Lawrence County planning board makes recommendations for future data centers in Massena (references Petawatt Holdings substation site plan) · NNY360 · retrieved September 21, 2026
4.St. Lawrence County Planning, LGC 2025 Planning & Zoning presentation: NYISO interconnection queue excerpt (Petawatt Holdings 'St Lawrence Data and Agricultural Center' 200 MW, queue #1213; ZeroC Data Centers 'New York State Artificial Intelligence Data Center' 300 MW, queue #1731; both POI Dennison 115 kV) · St. Lawrence County Planning Office · retrieved September 21, 2026
5.Petawatt Massena Data Center, planned, 14 acres · Cleanview · retrieved September 21, 2026

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