WHAT IS A BROWNFIELD AI DATA CENTER SITE?
A brownfield AI data center site is a former industrial location that already has a high-voltage connection to the RTE transmission network. These sites inherited their HV infrastructure from previous industrial uses that required large amounts of power — aluminum smelters (50-200 MW), steel mills, chemical plants, EDF thermal power stations.
Brownfield (existing HV): RTE connection already in place → 18–36 months to commissioning
Greenfield (new connection): RTE study + works + permitting → 3–5 years minimum
Best example: Nebius Béthune — former Bridgestone site · existing HV → 18 months to 240 MW
THE 63 GOVERNMENT SITES + 40 HIDDEN LOCATIONS
The French government has pre-qualified 63 sites for AI data center deployment, including 4 RTE fast-track sites at 400-1,000 MW each. These are public and known to every developer in Europe.
GridReadiness maintains a proprietary database of 40+ additional brownfield sites with confirmed HV infrastructure that have never been publicly marketed to AI data center developers. These sites appear in BASIAS (national industrial inventory) and Cartofriches (CEREMA brownfield database) but have not been cross-referenced with RTE network data for AI data center targeting.
Former aluminum smelters (Pechiney/Rio Tinto Alcan): Noguères, Lannemezan, Lacq basin (200+ ha)
Former EDF thermal plants: Cordemais (closing 2026-27), Loire-sur-Rhône (AMI open), Le Havre
Former steel sites: Florange, Gandrange (Lorraine), Escaudain (Data4 confirmed)
Former chemical sites: Lacq/Mourenx, Carling, Feyzin
Former military bases: BA128 Metz-Frescaty, Alsace OTAN bases
Former paper mills: Alizay (Eure), Chapelle Darblay, Stracel
Former automotive: Renault Flins (reconversion), Ford Blanquefort
PRIORITY BROWNFIELD SITES — TIER 1
- Lacq / Mourenx (Pyrénées-Atlantiques): 200+ ha · former Pechiney + Celanese + Yara · CCLO manages · confirmed HV · no committed DC project
- Alizay / Chapelle Darblay (Eure, Normandie): former International Paper mill · large site · confirmed fiber connectivity
- Cordemais (Loire-Atlantique): EDF thermal closing 2026-27 · first-mover window opening · existing HV from power generation
- Sites adjacent to Escaudain (Nord): Data4 confirmed the category · neighbouring sites available
- Loire-sur-Rhône (Isère): EDF AMI open · no committed partner announced as of June 2026
GRID COMPATIBILITY EVALUATION — NOT ALL BROWNFIELDS ARE EQUAL
A brownfield site with existing HV infrastructure is not automatically suitable for AI data center deployment. GridReadiness evaluates three compatibility dimensions:
- Capacity adequacy: Does the existing connection have sufficient capacity for the target MW load, or does it require reinforcement that reintroduces timeline risk?
- Voltage compatibility: Is the existing connection at the right voltage level (63kV minimum for 10MW+, 225kV for 100MW+)?
- Capacity absorption: Have other projects already queued for the same substation, reducing available headroom?
A brownfield site that scores well on all three delivers 18-36 months. A site with existing infrastructure but capacity issues can still require reinforcement works that extend the timeline to 3-5 years — eliminating the advantage.
HOW GRIDREADINESS IDENTIFIES BROWNFIELD SITES
Source 1: BASIAS — 300,000+ former industrial sites nationally inventoried
Source 2: Cartofriches (CEREMA) — 14,300+ characterised brownfield sites
Source 3: RTE network map — HV lines at 63kV, 90kV, 225kV, 400kV
Filter: former industrial sites within 5km of 63kV+ RTE infrastructure
Verification: direct contact with regional development agencies and site owners
Output: qualified sites with confirmed HV access and current availability status
RELATED INTELLIGENCE
Full Brownfield Database (40+ sites) · RTE Connection Timeline · AI Data Center France · Nebius Béthune Case Study
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Request Grid Assessment →GridReadiness · gridreadiness.com · frederic_arn@yahoo.fr · Updated June 2026