The five questions that decide a project
A project to connect?
This page explains the rules. For your project, we step in at three points: before committing to a site, when filing the request, and when the grid operator's offer arrives.
Depending on your stage:
- verifying a site's power before buying or financing it
- preparing and following the PTF request to RTE
- reviewing the study, PTF or Enedis offer received
First conversation confidential and with no commitment. Fixed fees proposed in writing before any assignment. Best-efforts obligation.
Open calculator: estimate what a month of delay costs and a site's usable IT capacity.
Download or fill in: the PTF request checklist (PDF, 23 points) · your project readiness scorecard (12 questions).
In short: a grid data center in France connects to the transmission network through one operator, RTE, under a single national procedure. Connected brownfield sites typically take several years, greenfield sites 3 to 5 years. A regulator-approved fast-track and five pre-identified sites (4.8 GW) aim to shorten this.
Fast-track procedure: approved by the regulator (CRE) in May 2025
Pre-identified sites: five connection-ready sites, 4.8 GW, published June 2026, commitment at reservation
Queue pressure: close to 18 GW reserved for around 80 data center projects by May 2026
Typical timeline: several years, even on a connected brownfield, and longer greenfield
Fast-track procedure: 8 sites identified at about 1 GW each, 4 allocated with a secured connection, over 7.5 GW in total; first steps from 2027, full capacity in 2029-2030
9 GW of new hosting capacity by 2030 in Dunkirk, Le Havre and Fos-sur-Mer
Access rules: gradual shift to "first ready, first served", and a Paris-region pilot letting data centers commit earlier to their real needs, against a financial commitment and a firm capacity offer from RTE
Source: Thomas Veyrenc, RTE's executive director for economics, strategy and finance, Paris Infraweek, 2 November 2026.
HOW GRID CONNECTION WORKS IN FRANCE
Large data centers connect to RTE's high-voltage network, while smaller sites can connect to the distribution network operated mainly by Enedis. Unlike the US, where rules vary across regional operators, France has a single transmission operator and one national procedure, which makes timelines more legible for developers and lenders. See the RTE connection timeline and the five steps of RTE's procedure (in French).
THE FAST-TRACK AND PRE-IDENTIFIED SITES
France's answer to congestion has been to decide where capacity goes first. Under a fast-track approved by the regulator, RTE and the State published five connection-ready sites totalling 4.8 GW in June 2026, with a financial commitment required at reservation. Details: RTE's five fast-track sites.
WHERE THE RISKS ARE
Speculative queue. RTE had reserved close to 18 GW for around 80 data center projects by May 2026, and has signalled a move away from pure first-come, first-served.
Equipment. Major transformer manufacturers quote 48 to 60 months or more; second-tier European makers remain the fastest route. See our transformer lead time tracker.
Permits and community. Building permits can be challenged by third parties for two months after posting, and several French projects faced legal challenges or local campaigns in 2026. See the France opposition tracker.
A REAL CASE: BÉTHUNE
Nebius's AI data center on the former Bridgestone plant in Béthune shows both sides of the French picture. The building reportedly went live in about ten months thanks to the brownfield, but only about 45 MW is available from the grid at first; the full 240 MW connection is reportedly around three years away, with gas generation planned in the interim. See Béthune: the building took ten months, the grid will take three years.
BY REGION
Grid conditions differ across French regions. See our regional pages for Île-de-France, Hauts-de-France, Auvergne-Rhône-Alpes, Marseille and PACA and the Grand Ouest, and the full grid data center hub.
HOW IT WORKS
WHAT WE COMMIT TO
Review of connection documents and the announced energisation date for a European data center developer, ahead of its investment decision. Audit of high-voltage equipment sourcing for a petrochemical group.
We do not design, build or sell equipment. No commission, no brokerage. Never on both sides of the same project.
Confidentiality agreement before any document. Professional liability insurance. Best-efforts obligation: only RTE and Enedis commit to capacity and a date.
Our difference
The truth is on the ground
Software spots signals. At GridReadiness, we verify them.
Maps, databases and announcements tell you where to look. They do not tell you whether a substation can really be used, whether works are progressing or whether a date will hold. Our experts go and see, and read the original documents.
- site and substation visits: equipment condition, nameplates, progress of works, posted permits
- reading the original documents: connection studies and proposals, agreements, manufacturer quotes
- the experience of people who have delivered grid connections, commissioning and construction
- a written opinion that separates what is verified from what remains to be confirmed
Connection times exceed five years for GW-scale AI factories (Vertiv)
See Time to Connect: what really sets the date
Source: J3e no. 929, October 2026, "AI, an infrastructure revolution" (in French).
FREQUENTLY ASKED QUESTIONS
How long does it take to connect a data center to the grid in France?
Typically several years on a brownfield site with existing high-voltage infrastructure, and 3 to 5 years on a greenfield site, depending on local network capacity and works.
Who connects data centers to the grid in France?
RTE for transmission-level connections, under a single national procedure. Smaller sites may connect to the distribution network, mainly operated by Enedis.
What are France's fast-track data center sites?
Five connection-ready sites totalling 4.8 GW, published in June 2026 under a regulator-approved fast-track procedure, with a financial commitment required at reservation.