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Data center campus · former Mike Mansfield Advanced Technology Center, about six miles southeast of Butte (approximate), Silver Bow County, Montana

Atlas Power Butte

Operating as of June 2026

An operating computing-hosting site southeast of Butte, used for crypto-mining, whose owner signed a letter of intent with NorthWestern to grow to up to 150 MW. Also known as: former CryptoWatt site, former Mike Mansfield Advanced Technology Center.

Cite← Montana data centers
Beaverhead CountyBig Horn CountyBlaine CountyBroadwater CountyCarbon CountyCarter CountyCascade CountyChouteau CountyCuster CountyDaniels CountyDawson CountyDeer Lodge CountyFallon CountyFergus CountyFlathead CountyGallatin CountyGarfield CountyGlacier CountyGolden Valley CountyGranite CountyHill CountyJefferson CountyJudith Basin CountyLake CountyLewis and Clark CountyLiberty CountyLincoln CountyMadison CountyMcCone CountyMeagher CountyMineral CountyMissoula CountyMusselshell CountyPark CountyPetroleum CountyPhillips CountyPondera CountyPowder River CountyPowell CountyPrairie CountyRavalli CountyRichland CountyRoosevelt CountyRosebud CountySanders CountySheridan CountySilver Bow CountyStillwater CountySweet Grass CountyTeton CountyToole CountyTreasure CountyValley CountyWheatland CountyWibaux CountyYellowstone CountyAtlas Power Butte · Operating · 75 MW
Power75MW reported · record

Who is behind it

ProjectAtlas Power ButteAlso: former CryptoWatt site, former Mike Mansfield Advanced Technology Center
Developer and teamAtlas Power Holdings LLC (Atlas Power Group)
End userNot found in the recordsNot yet named in any record or credited report we have found.

The record, newest first

  1. Legislative staff listed the site as operating for crypto-mining at 75 MW, with an expansion planned. (Montana Legislative Services Division, June 2026)

  2. Atlas Power and NorthWestern Energy signed a nonbinding letter of intent for up to 150 MW of supply. (NorthWestern Energy Group, Inc. (U.S. Securities and Exchange Commission), 2026; The Livingston Enterprise (Lee Newspapers), Aug. 6, 2026)

  3. Reporting in December 2019 said the majority owner of CryptoWatt, the crypto-mining company that earlier owned and ran this site, was being held without bail after a federal indictment in New Jersey over BitClub Network, a separate venture that officials said had no connection to CryptoWatt; the Butte operation stopped and its 32 workers were laid off. The case never went to trial: on July 28, 2026, at prosecutors' request, a federal judge dismissed the charges with prejudice. The reporting concerns a former owner, not Atlas Power, which acquired the site later. (Flathead Beacon (Associated Press), Dec. 30, 2019; DatacenterDynamics, Dec. 20, 2024; Bloomberg Law, July 28, 2026)

Conflicts and open questions

  • Kept as an operating site of any size, as the tracker does for other crypto-mining computing sites; it is not an AI campus on the record.
  • No electric service agreement was active as of August 2026, according to reporting on the released letters.

The full record

Status note
Legislative staff described it in June 2026 as an operating crypto-mining site with plans to expand; its future use is not stated.
Power note
75 MW is the site's current requirement as listed by legislative staff; NorthWestern's December 2024 letter of intent covered up to 150 MW, and staff list a further 150 MW as planned. These figures conflict and are left as stated.
Evidence
Primary public records
Size class
50 MW or more (tracker scope)
Map position approximate, from the reported address or area. Updated Oct. 17, 2026.