Overview

• EDF said Unit 4 at Paluel was shut at 9 p.m. local time on September 3 after jellyfish clogged pumping-station filters, and output at Unit 3 was reduced as a precaution.
• The event cut the site’s generation by about 2.4 gigawatts from a total 5.2 gigawatts of capacity.
• According to the operator, the intrusion occurred on the non‑nuclear side of the plant, with no impact on safety, personnel, or the environment.
• Plant teams are clearing intake screens, performing diagnostics, and preparing to restart the affected reactor and restore full power.
• The disruption follows a similar clog at Gravelines roughly three weeks earlier, highlighting climate‑related operating pressures for seawater‑cooled reactors in a system where nuclear provides about 70% of electricity.