Operating

Big Watt Digital Sully County Data Center

Big Watt Digital Sully County Data Center is an operating data center in Onida, SD, run by a private operator. The facility is reported at 30 MW. Bitcoin mining facility ~12 miles west of Onida; SD's largest operating data center at ~30 MW, expected to expand toward 300 MW; ~$850k/yr gross receipts taxes to local school district. Reported 2026. [Reviewed 2026-10-09: verified] Big Watt Digital's Sully Buttes Mining Facility in Onida, SD is confirmed operational at 30 MW with planned 300 MW expansion and $850k annual school taxes. Source: https://southdakotasearchlight.com/2026/01/30/sully-county-home-to-sds-largest-data-center-would-welcome-more-with-open-arms-official-says/.

30 MWPlanned capacity

Aerial imagery: USGS The National Map (public domain)

Project status

Announced
Permitting
Under construction
Operational

Recorded changes

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Community sentiment

This data center is operating.

The stance question is asked on projects still ahead.

What’s next

Election Day is in 11 days.

Tuesday, November 3
Election Day
Tuesday, November 37:00 AM · SD
Sully County: County Commission
Monday, November 9SD
South Dakota for Data Center Transparency: Mark your calendars.... All committee meetings are open to the public, and public input will be taken at each meeting. The meetings will be
Tuesday, December 17:00 AM · SD
Sully County: County Commission

Latest news

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Stories about it, and about Sully County, SD, land here.

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Records and documentation

South Dakota state legislation

HB3397 - Data center service classification requirementLegislationdatacenterbans.comDefines terms and requires the Corporation Commission to classify data center service.Download
HB1038 - PUC cost assessment authority over data centersLegislationdatacenterbans.comAllows the Public Utilities Commission to assess actual costs to data centers.Download
SB939 - AI/Data Center Regulatory Sandbox ProgramLegislationdatacenterbans.comCreates an Office of Transformation and Opportunity regulatory sandbox program with permits for high-impact data centers.Download
SF3968 - Data centers provisions modificationLegislationdatacenterbans.comModifies existing statutory provisions on data centers.Download
SB0318 - Data Center Non Disclosure AmendmentsLegislationdatacenterbans.comAmends rules on nondisclosure agreements related to data centers.Download
S0724 - Commercial Data Center Water Usage ReportLegislationdatacenterbans.comRequires water usage reporting from commercial data centers.Download
SB232 - Impose a one-year moratorium on the construction or expansion of hyperscale data centers.Moratoriumlegiscan.comPassed Feb 18, 2026Description comingDownload
HB1301 - Limit costs and risks associated with electricity use by data centers and impose a moratorium.Moratoriumlegiscan.comPassed Feb 18, 2026Description comingDownload

Site details

Operator: Big Watt Digital
County: Sully County, SD
Capacity: 30 MW
Address: Onida, SD
Stage: Operating

Size: not on file

Map

Photos

Aerial imageryUSGS The National Map · public domain
An $8 billion Treasury break helped Meta’s tax rate hit 2%. Senators want data center tax answersFortune
The states with the fewest and most data centers, rankedBusiness Insider
Finns Are Seething After Google Illegally Toppled 250,000 Trees for a Data CenterMother Jones
Google offer to pay others to help data center powerArkansas Online
This bill would make data centers pay their own way for powerSalt Lake City Deseret News