THE FIVE STAGES OF AN RTE CONNECTION
Stage 1 — Connection request: submit to RTE with location, power (MW), target date (Week 1)
Stage 2 — Connection study: RTE analyzes capacity, works required, cost estimate (6–18 months)
Stage 3 — Connection proposal: RTE offers solution with cost, timeline, capacity (months 12–18)
Stage 4 — Works: RTE builds the connection — line, substation, protection systems (12–24 months)
Stage 5 — Commissioning: first power delivered
Total greenfield: 3–5 years · Total brownfield: 18–36 months
WHY BROWNFIELD IS FASTER
On a brownfield site with existing high-voltage infrastructure, stages 2, 3 and part of stage 4 are already complete. RTE does not need to build a new connection — it needs to verify and potentially upgrade existing infrastructure.
Brownfield (existing 63kV+ connection): 18–36 months · most stages bypassed
Greenfield (new connection required): 3–5 years · full process
RTE fast-track (pre-approved sites): compressed procedure · 4 sites available · 400–1,000 MW
Example: Nebius Béthune — existing Bridgestone connection → first capacity end 2026 (18 months)
RTE FAST-TRACK PROCESS — WHAT IT MEANS
On May 7, 2025, the Commission de Régulation de l'Énergie (CRE) approved a dedicated fast-track connection procedure for AI data center sites. Four sites were designated at the Choose France summit on May 19, 2025 with 400–1,000 MW of capacity each. These sites allow industrial operators to pre-reserve substantial grid capacity, significantly compressing the standard timeline.
TIME-TO-POWER VS APPROVAL TIME — THE DISTINCTION THAT MATTERS
Published RTE timelines measure the approval and connection study process. They do not include transformer procurement, which must run in parallel.
For AI data center developers, the metric that matters is time-to-power — the total elapsed time from site selection to first megawatt delivered to a server rack. This includes the RTE connection process AND the transformer procurement AND the substation construction AND the building commissioning. These are partially parallel but not fully.
Transformer procurement (Efacec/Pauwels): 20–28 months (parallel with RTE works)
RTE grid works: 6–18 months (after study approval)
Substation + building commissioning: 6–12 months
Critical path: transformer procurement (20–28 months) or RTE works — whichever is longer
Realistic time-to-power (brownfield, well-managed): 24–36 months
RTE TIMELINE VS US GRID QUEUES
France brownfield RTE: 18–36 months ✓
France greenfield RTE: 3–5 years
Northern Virginia (PJM): 7–10 years
Texas (ERCOT): 5–7 years
Ireland: moratorium until 2028
Netherlands: banned until 2030
Germany (Frankfurt): banned until 2030
The RTE timeline advantage is only meaningful on brownfield sites. Greenfield France is not significantly faster than Germany. The competitive advantage is exclusive to sites with existing HV infrastructure.
GRIDREADINESS RTE CONNECTION ADVISORY
GridReadiness provides RTE connection strategy as part of the Grid Deployment Risk Audit and France Site + Equipment Sourcing service. We assess which RTE connection pathway applies to your specific site, estimate the realistic timeline, and identify whether any of the 4 fast-track sites or 40+ brownfield locations match your requirements.
Further reading: AI Data Center France · Brownfield AI Sites France · 40+ Hidden Brownfield Sites
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Request Grid Assessment →GridReadiness · gridreadiness.com · frederic_arn@yahoo.fr · Updated June 2026