CRE, the French energy regulator, has just published the locations of injection and withdrawal zones on the transmission network. A zone refers to a coherent grouping of lines and substations downstream of a transformer substation.
An “injection zone” is a network area structurally constrained by solar generation. A zone falls into this category if (1) at least 50% of its “peaks” are injection peaks, and (2) more than 80% of these peaks occur between 11:00 AM and 6:00 PM. 396 such zones have been identified within the HTB network and 320 on the HTA network.
A “withdrawal zone” is a network area structurally constrained by household consumption that drives congestion during evening and winter peaks. A zone is classified as a withdrawal zone when (1) more than 80% of the zone dimensioning peaks are withdrawal peaks, and (2) more than 80% of the TURPE peak hours coincide with the zone dimensioning peaks. 1,588 such zones have been identified within the HTB network and 1,121 on the HTA network.
Only assets connected at these designated zones are eligible for the optional grid tariff.
1,114 existing zones on the HTB network and 794 on the HTA network remain “standard” and are neither injection or withdrawal zones.
At Eclipse, our simulations show that—despite certain limitations—batteries connected to injection zones can generate higher net revenues (compared to batteries located in the standard zones). This is due to the reduction in grid tariff (TURPE 7) in these zones, in effect in August 2026.
New capabilities unlocked by injection zones
