Data Center Census

Somerset, Niagara County, NY

Lake Mariner

Also known as TeraWulf Lake Mariner

Operating102 MW of AI capacity online July 2026; 336 MW (CB-4, CB-5) under construction
  1. Rumored
  2. Proposed
  3. Approved
  4. Under construction
  5. Operating

TeraWulf's data center campus on the site of a former coal-fired power plant in Somerset, Niagara County, New York, which began with bitcoin mining and is expanding into AI hosting for Fluidstack, with Google backstopping part of Fluidstack's lease obligations. TeraWulf reported 102 MW of revenue-generating AI capacity online in July 2026, with 336 MW more under construction in buildings CB-4 and CB-5. Power comes mainly from New York Power Authority hydropower plus NYSEG.

Key facts

Size & schedule

Planned capacity750 MW [4]
total power allocated from NYSEG and NYPA
IT load360 MW [2]
Fluidstack critical IT across CB-3, CB-4 and CB-5
Site size410 acres [4]
total parcel
Permanent jobs (promised)150 [4]
potential full-time workforce with AI buildings, up from 52
Target completionCB-4 phased delivery H2 2026; CB-5 early 2027 [3]

Power

Power supplyAbout 90% hydropower from New York Power Authority, remainder NYSEG; dual 345 kV lines [4]

Water

Coolingclosed-loop water cooling [1]

Money & incentives

Tax incentivesNew York State internet data center sales tax exemption; Niagara County disputes Lake Mariner's eligibility and has authorized legal action [7]
Source excerpt
“The Legislature is concerned this decades-old exemption is being wrongly claimed by internet data centers like Lake Mariner in the Town of Somerset, costing state and local governments millions in tax dollars.”

Local decisions & site

ZoningPlanned Unit Development district amendment, site plan, SEQR review and special use permit [4]
Source excerpt
“a special joint planning board and town board meeting would be held on Thursday night for approving an amendment to the Planned Unit Development district where the data centers are located, a site plan, SEQR review, and a special use permit.”

Figures are as stated by the cited source. Where sources disagree, each figure is shown.

Timeline

  1. TeraWulf plans AI buildings; Niagara County Planning Board review and town hearing scheduled [5]

  2. TeraWulf signs 200+ MW, 10-year hosting agreements with Fluidstack; Google backstops $1.8 billion [1]

  3. Fluidstack adds 160 MW CB-5 lease; Google backstop rises to about $3.2 billion [2]

  4. Somerset Planning Board and Town Board unanimously approve expansion on 61 acres [4]

  5. CB-3 delivered, bringing AI capacity online to 102 MW [3]

Issues raised

  • A nearby resident reports noise disrupting sleep; some criticize adjacent solar expansion [6]
  • Local Assemblyman Paul Bologna supports the project as good for Niagara County [6]

Sources

  1. TeraWulf Signs 200+ MW, 10-Year AI Hosting Agreements with Fluidstack
    TeraWulf · Aug 14, 2025 · company
  2. TeraWulf Announces Fluidstack Expansion with 160 MW CB-5 Lease at Lake Mariner
    TeraWulf · Aug 18, 2025 · company
  3. TeraWulf Reports Second Quarter 2026 Results
    TeraWulf · Aug 5, 2026 · company
  4. Lake Mariner campus adding more AI data center capacity
    Niagara Gazette (via Yahoo Finance) · Oct 25, 2025 · news
  5. New Somerset, N.Y., Data Center Buildings Would House AI
    Lockport Union-Sun & Journal (via GovTech) · Oct 8, 2024 · news
  6. Proposed data centers dividing New Yorkers
    Spectrum News State of Politics · Jul 7, 2026 · news
  7. Niagara County Legislature Calls on Hochul to Audit Internet Sales Tax Exemption
    Niagara County (via EIN Presswire) · Aug 6, 2026 · government