The 25th International Collaboration Meeting of the Jiangmen Underground Neutrino Observatory (JUNO) was successfully held from January 13 to 17, 2025, in Kaiping, Jiangmen. The event brought together 308 researchers from 13 countries and regions, with 92 participants representing institutions outside of China.

During the meeting, Prof. Yifang Wang, the spokesperson for JUNO, shared exciting updates on the project's progress. Since the last collaboration meeting, significant milestones have been achieved in the installation of the JUNO detector. Notably, the installation of both the central detector and the water pool veto detector has been completed. The team has now embarked on the next phase, focusing on the installation of the top plastic scintillator detector.

The JUNO detector began filling with ultra-pure water on December 18, 2024, marking a crucial step forward. This process has been proceeding smoothly, with multiple rounds of joint detector commissioning conducted to ensure optimal performance. These tests have shown excellent results, particularly in systems like the photomultiplier tubes and electronics. The water filling is expected to conclude by the end of January, after which several days of pure water experimental data will be collected during the Spring Festival.

In parallel, the production of linear alkylbenzene, the raw material for the liquid scintillator, began in early January and is being transported to the JUNO site. The filling of the liquid scintillator is expected to begin in early February with plans to complete this phase by summer. Meanwhile, the Taishan Antineutrino Observatory, a satellite detector for JUNO, is making remarkable progress and is scheduled to initiate operations and data collection this summer.

Throughout the meeting, various detector subsystems and analysis working groups reported on their progress, engaging in extensive and productive discussions on topics such as detector commissioning, data analysis preparation, and publication strategies.

Following the collaboration meeting, a two-day workshop on physics analysis and commissioning was held, focusing on detector calibration, reconstruction, and offline computing, with a particular focus on photomultiplier tube performance calibration and water phase detector reconstruction. As the water filling nears completion, participants also developed future plans and strategies for data acquisition.

The JUNO collaboration has decided that the 26th JUNO International Collaboration meeting will take place from July 26 to 31, 2025, in Kaiping.