More and more renewable developers are combining a solar plant, a battery park and sometimes a data center on the same land. The idea is appealing: one site, one substation, building blocks that complement each other. But for the grid, these are three projects that follow different rules. That is often where timelines slip.
DOES YOUR SITUATION LOOK LIKE ONE OF THESE?
1. THREE BLOCKS, THREE LOGICS
The solar plant exports. Its connection falls under the regional renewable connection scheme (S3REnR), with a cost share to pay and capacity reserved substation by substation.
Batteries export and import. For the grid they are both a producer and a consumer, which weighs on the connection solution, the access conditions and the place in the queue.
The data center imports, continuously. It needs firm power around the clock. Above a few tens of MW, the request generally goes to RTE, with its own timelines, at a time when nearly 18 GW of data center requests were already signed by May 2026.
2. QUESTIONS TO SETTLE EARLY
How much export, how much import, and by when?
Enedis or RTE for each block, and which substation is really available?
Is a connection offer with power limitations acceptable for storage or generation?
Which company will hold each request and each agreement?
What timeline for each block, and in which order?
3. THE MOST COMMON MISTAKES
Assuming solar reduces the data center's connection. Solar output varies. A data center needs firm power at night and in winter. The import connection must be sized accordingly.
Counting on the batteries as backup. A battery park designed for grid services is not a data center backup system. The two uses are designed differently, and combining them is decided from the start. See UPS vs BESS: two different jobs.
Changing the project after filing. A significant change in power or configuration can trigger a new study and the loss of the queue position.
Separating the grid connection from the permits. The permits must describe the same project as the connection requests. If the permitted capacity is lower than the requested capacity, the operator may reduce it.
4. THE METHOD
Start with the map of available capacity around the site, for export and for import. Talk to Enedis and RTE early to test the assumptions. Sequence the requests according to the real timeline of each block, rather than filing everything at once. And keep the grid connection, the permits and the financing consistent: that is what lenders look at.
See also our battery storage support, the BESS connection queue and the RTE PTF request for a data center.
Sources: RTE and Enedis technical reference documentation; regional renewable grid connection schemes (S3REnR); French energy regulator (CRE) decisions on connection queues; RTE figures of May 2026 on data center connection requests. Procedures change regularly; only the version in force when the request is filed applies. This article is general information.
FREQUENTLY ASKED QUESTIONS
Can a solar plant and a data center share the same grid connection?
In some configurations, yes, but export and import needs differ and each block has its own rules. It is settled with the grid operator before filing.
Does solar generation reduce the power to request for the data center?
Generally not. A data center needs firm, continuous power; variable solar output does not reduce the import connection by the same amount.
Can a battery park serve as the data center's backup?
Not unless it was designed for it. Storage sized for grid services and a data center backup system meet different requirements.
What happens if the project changes after the request?
A significant change in power or configuration can trigger a new study by the grid operator and the loss of the queue position.