# Global Power Grid Anomalies Traced to Synchronized Battery Systems Researchers discover that minute-by-minute state-of-charge checks by internet-connected batteries cause grid-wide frequency drops. - **Source:** [TechCrunch](https://techcrunch.com) - **Published:** 2026-11-08 - **Topic:** [technology](https://brifing.si/c/technology) - **Original article:** - **On Brifing:** https://brifing.si/s/2582d5ca-f9ac-40b3-8215-a4cee6bba226 ## Mysterious Global Grid Oscillations For years, grid managers worldwide observed a recurring electrical anomaly where frequency dropped every 60 seconds. These synchronized sags appeared simultaneously across different continents, creating a complex puzzle for transmission operators. Dirk Witthaut of Forschungszentrum Jülich led the investigation into these persistent oscillations, which threatened to damage sensitive power plant equipment. ## Initial Focus on Hydropower Researchers initially suspected hydropower plants, as their turbines are known to cause ultra-low frequency oscillations through mechanical resonance. Using computer models of Scandinavian grids, the team confirmed that resonance could peak once per minute. However, mechanical resonance typically fluctuates, failing to explain the rigid, clockwork regularity of the observed grid-wide signal. ## Identifying the Clockwork Culprit The team installed 80 smart power quality meters at the Jülich campus to monitor distribution lines and battery storage. Data revealed that stationary batteries, including data center uninterruptible power supplies, check their state-of-charge exactly every minute. Because these devices use internet-synchronized clocks, their collective power draw creates a measurable, periodic grid disturbance. ## Evidence from Irish Data Centers Ireland provided clear evidence of the phenomenon, as data centers consumed 18% of the nation’s electricity by 2022. Between 2016 and 2021, the minute-by-minute frequency drop on the Irish grid quadrupled from 3 milli-Hertz to 12 milli-Hertz. Recent measurements have even exceeded 20 milli-Hertz, highlighting the growing impact of concentrated server infrastructure. ## Risks to Grid Stability While 20 milli-Hertz is within the 50 Hz grid's tolerance, it adds unnecessary stress to the system. If other loads fluctuate simultaneously, these synchronized battery checks could push the grid toward blackout conditions. The cumulative effect of thousands of devices acting in unison creates a significant, albeit invisible, burden on global infrastructure. ## Simple Software-Based Solutions The solution involves adding randomization to the state-of-charge check schedules within battery and UPS firmware. By staggering these tasks, the periodic spikes would be smoothed out, eliminating the resonance. Manufacturers can implement this fix through simple software patches, preventing the need for expensive hardware modifications or complex grid-wide infrastructure overhauls. ## Expanding IoT Device Risks The research team also detected periodic power fluctuations in various IoT devices, including smart ovens and Raspberry Pi clusters. While the fix remains a software patch, the challenge lies in the fact that less than 3% of IoT devices currently run the latest firmware, leaving many systems vulnerable to these persistent, unpatched electrical patterns. ## Future Regulatory Coordination Needs Solving this mystery requires global coordination, as regulators can only address their specific regional grids. While the cause is now understood, the problem may persist for years due to the slow adoption of firmware updates. Future grid stability will depend on mandatory standards for connected devices to prevent such synchronized, large-scale disturbances. ## Sources covering this story - https://techcrunch.com/2026/11/08/coordinated-disturbances-haunt-grids-worldwide-heres-how-researchers-solved-the-mystery/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._