Update on the Flamanville EPR: the reactor has reached 100% of nuclear thermal power 14 December 2025 marks a major milestone : the Flamanville 3 reactor reached 100% nuclear thermal power at 11:37am and generated 1,669MW of gross electrical power*. The ramp-up to 100% nuclear thermal power follows the approval by the French nuclear safety and radiation protection authority (ASNR) on 12 December 2025, to go beyond the 80% threshold. Reaching the 100% mark for the first time enables testing of equipment a ...