Project dossier · Memphis (Shelby County), Tennessee

xAI Colossus Approved

Operating and expanding (~$20B, ~2 GW ambition). The live fight is air quality: on-site gas turbines in southwest Memphis - an area already failing federal ozone standards - drew a Clean Air Act suit. Environmental groups' tracking put unpermitted turbines at 27 in Feb 2026, growing to 59 by mid-2026 across the Colossus complex (incl. Colossus 2 in Southaven, MS).

Key facts

Operator
xAI
Tenant
xAI
Size
2,000 MW
Location
Memphis (Shelby County), Tennessee
Stage today
Approved

Source
read 2026-08-07

What to do next

Next step: Approved — pivot from stopping it to a binding CBA: enforceable caps on noise, water and cost, plus a community benefit.

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What has happened so far (11 events)

  • 2024-12-04announcement
    At the Greater Memphis Chamber's Annual Chairman's Luncheon, xAI announced an expansion of its Colossus supercomputer to a minimum of one million GPUs, described as the largest capital investment in the region's history. · source
  • 2025-06-17filing
    The Southern Environmental Law Center, on behalf of the NAACP, filed a 60-day notice of intent to sue xAI over at least 35 unpermitted combustion turbines at the Colossus data center near Memphis. · source
  • 2025-07-01filing
    In July 2025, after SELC threatened a citizen suit, the Shelby County Health Department issued an air permit covering 15 of the 30+ turbines then operating unpermitted at the Memphis site. · source
  • 2025-12-15ruling
    After a seven-hour hearing at the University of Memphis attended by hundreds, the Memphis and Shelby County Air Pollution Control Board dismissed the appeal of xAI's air permit on grounds of mootness. · source
  • 2026-01-08financing
    xAI announced a more than $20 billion investment in a Southaven, Mississippi data center (MACROHARDRR) that would bring its computing power to nearly 2 gigawatts; the Mississippi Development Authority approved xAI for its Data Center Incentive program. · source
  • 2026-02-13filing
    Earthjustice and the Southern Environmental Law Center, on behalf of the national NAACP and its Mississippi State Conference, sent a 60-day notice of intent to sue xAI over 27 unpermitted gas turbines in Southaven powering the Colossus 2 data center. · source
  • 2026-03-03permit
    xAI filed a permit for a $659.3 million, 75-foot, four-story building of roughly 312,000 square feet on a parcel adjacent to its Colossus 2 site on Tulane Road, reported March 3, 2026. · source
  • 2026-03-10permit
    The Mississippi Environmental Quality Permit Board unanimously approved a PSD construction permit allowing xAI affiliate MZX Tech to install 41 permanent methane gas turbines at its Southaven plant powering the Memphis data center operations. · source
  • 2026-04-14ruling
    NAACP, represented by Earthjustice and SELC, filed a Clean Air Act suit against xAI and MZX Tech (N.D. Miss.) over unpermitted gas turbines serving the Colossus complex. · source
  • 2026-05-06filing
    The NAACP asked the U.S. District Court for the Northern District of Mississippi for a preliminary injunction to halt xAI's gas turbines at its Southaven facility while the Clean Air Act lawsuit proceeds, as reported May 6, 2026. · source
  • 2026-06-16filing
    The U.S. Department of Justice moved to intervene in the NAACP's Clean Air Act suit and urged the court to dismiss it, arguing that shutting off xAI's Southaven turbines would harm national, economic and energy security because the Grok AI model supports Department of War military operations, including recent strikes involving Iran. · source

Find the paper trail

Find the paper trail (2 filed · 11 places to look)

Permits already on file (2)

Filings we have a source for — the record, not a place to look for one.

  • 2026-03-10
    The Mississippi Environmental Quality Permit Board unanimously approved a PSD construction permit allowing xAI affiliate MZX Tech to install 41 permanent methane gas turbines at its Southaven plant powering the Memphis data center operations. · source
  • 2026-03-03
    xAI filed a permit for a $659.3 million, 75-foot, four-story building of roughly 312,000 square feet on a parcel adjacent to its Colossus 2 site on Tulane Road, reported March 3, 2026. · source

State environmental permits

Backup generators, water withdrawal and stormwater are permitted by the state, usually earlier and in more detail than anything filed locally.

  • Tennessee TDECThe program page: which permits this state requires, and the office that issues them.
  • TDEC DataviewersSearchable public filings — search the operator, the shell LLC on the deed, and the address.

County & town filings

The rezoning application, site plan, traffic and noise studies, staff report and every revision.

Utility & grid records

The electricity request is filed with the grid operator and the utility long before the town hears about it — and states the real load.

Federal databases

Works anywhere, and covers the operator's record at its other sites.

  • EPA ECHO facility searchEvery federally-reported air, water and waste permit at a facility, plus its inspection and violation history. Search by address or draw a radius around the site. This project's locality centres on 35.060, -90.150 — search that point with a 5-mile radius.
  • EPA EnvirofactsThe same underlying records, queryable by county — useful for 'what else is permitted near this site' rather than one facility.
  • EPA Facility Registry ServiceResolves the shell LLC on a permit to the facility it belongs to. Worth a look when the filing name means nothing locally.

These are places to look, not evidence that anything has been filed. Links were checked on 2026-08-21; search links are queries, not records. What to ask for.

Recent news

55 stories tracked since 2026-07-16 across 24 outlets. 42× Local officials are moving to pause or block the project. 7× A community is pushing back on a nearby data center. Most recent: “Memphis councilman addresses interrupted council meeting, postponed data center moratorium vote” (localmemphis.com, 2026-10-08).

+43 more on the story tracker.

Automated news aggregation, not human-verified — follow each link to the original outlet. Part of the story tracker, 55 headlines archived.

Around here

Other tracked projects in Tennessee

Cite this page: GridWatch AI, “xAI Colossus”, aigridwatch.com/projects/xai-colossus-memphis-tn, retrieved 2026-10-11.

As of August 2026 (2m ago) · changes weekly — re-check before citing

A working set of identified proposals a community can track, not a census — most of the country's activity is not in here yet. Pennsylvania is the exception: its rows are synced from PA DEP's own data-center permit tracker, so the state's coverage is close to complete and carries the permit trail with it. **Each row carries its own provenance.** Rows showing a verification date link to reporting or the governing body's own record and were read on that date; rows marked *unverified* have no source on record — a lead to check, not a fact to cite. **Stage is derived, not asserted.** *Hearing scheduled*, *Awaiting decision*, *Approved* and *Withdrawn* are computed from each row's milestone dates on every rebuild, so a hearing date that has passed stops reading 'scheduled'. Hearings get moved and projects re-file under new names — treat a scheduled date as the earliest to act by, and confirm with the clerk before relying on it. Leads are mined into data/project_candidates.json and promoted here only after a human reads a primary source.

Part of the data center project tracker — open data, CC BY 4.0 (JSON · CSV).

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