This chat log centers on the unexpected vulnerabilities of even highly redundant datacenter power systems. Hunterkll recounts a "perfect sequence of events" at a datacenter where, despite dual power feeds, two substations, maintained generators, and a large battery bank, a full outage occurred. This was caused by two separate "fried squirrels" taking out both substations within an hour, followed by generator malfunctions and premature battery depletion. Trifton advocates for "all lights out" real-world testing of such systems, while Hunterkll notes the practical difficulties of doing so without impacting customers. Trifton also shares a personal experience where a faulty utility circuit caused a UPS to fail due to a race condition during power fluctuations.