Google Cloud Blames London Region Outage on Generator Controller Miswiring

Google Cloud attributed a six-hour outage in its London region to a programmable logic controller on a generator that was wired to the wrong side of a switch. Because backup generators never started, UPS batteries drained and the facility lost power. The incident highlights how a single wiring error in power infrastructure can take down a major cloud region.

Why it matters: It is a concrete case study for IT ops and SRE teams on verifying failover paths and backup power logic, since configuration errors can defeat redundancy that looks sound on paper.