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Data center project · Walla Walla County, Washington

Amazon Attalia Data Center Campus, Wallula Gap Business Park

Proposed · Amazon's plan for up to 16 data center buildings on port land west of Walla Walla. The first application covers three buildings. Also known as: Advance Phase LLC.

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Status
Proposed · as of Sept. 1, 2026
Location
Wallula Gap Business Park, Sundance Road near Highway 12 (Attalia) · Walla Walla County
Status note
The county found the land-use application complete; no decision has been made.
Power
Not reported
Amazon has not disclosed its power needs.
Land
554 acres
About 554 acres sold by the port; the first application covers 134 acres.
Investment
$4.8 billion for the full campus, as reported.
Developer and team
Amazon Data Services (Amazon Web Services)
End user
Amazon Web Services
Utility
Columbia Rural Electric Association (per the application, as cited in a comment letter)
Water
The SEPA checklist lists 18 million gallons a year of surface water for cooling, but Amazon's FAQ says 14 million, so stated figures range from 14 to 18 million gallons a year. Groundwater would serve as temporary cooling water until Columbia River rights are converted, starting in 2029.
Evidence
News reports; primary records not yet obtained
Size class
50 MW or more (tracker scope)
Map position approximate, from the reported address or area. Updated Oct. 17, 2026.

Updates, newest first

  1. Oct. 7, 2026 The Washington State Standard reported a county comment period through Oct. 12, protests statewide, and that the county's community development director did not think an environmental impact statement was needed. (Washington State Standard (republished by The Spokesman-Review), Oct. 7, 2026)
  2. Sept. 1, 2026 Walla Walla County found the application for three 220,000-square-foot buildings complete, letting permit and environmental review go ahead. (Elkhorn Media Group (Columbia Basin News), Sept. 1, 2026)
  3. July 31, 2026 Earthjustice, for Columbia Riverkeeper plus the Walla Walla Anti-Data Center League, asked the county for a full environmental impact statement, citing the application's three buildings on 134 acres, substation, evaporation ponds and water plans. (Earthjustice (comment letter to Walla Walla County Community Development for Columbia Riverkeeper and the Walla Walla Anti-Data Center League), July 31, 2026)
  4. Feb. 13, 2026 Elkhorn Media Group reported Port of Walla Walla commissioners unanimously approved selling about 554 acres to Amazon Data Services at $65,000 an acre ($36,007,400). (Elkhorn Media Group, Feb. 13, 2026)
  5. Feb. 12, 2026 DCD, crediting the Tri-City Herald, reported Amazon Web Services was behind the purchase and described a $4.8 billion, 16-building plan in four phases. (DatacenterDynamics, Feb. 12, 2026)
  6. Oct. 2024 Advance Phase LLC bought about 500 acres in the Wallula Gap Business Park for $32.5 million. (DatacenterDynamics, Feb. 12, 2026)

Conflicts and open questions

  • Water figures conflict between the SEPA checklist (18 million gallons a year) and Amazon's FAQ (14 million); Amazon did not immediately respond when the Washington State Standard asked about the difference.
  • County primary records (the application and SEPA checklist) were not opened directly.

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