Not really ‘Sustainable Energy’ but possibly interesting to a community interested in all things power…
Network rail had an overvoltage for 20s knocking out a big chunk of signalling gear. They have been remarkably forthcoming on the issue (which I like).
There is a bit more on the twitter thread https://twitter.com/NetworkRailSE/status/1207703163358392322?s=20
Interesting that despite multiple supplies, they only failover on a power cut not on an overvoltage. Classic blinkered approach to system design / business continuity; focusing on the ‘usual’ problem rather than the thing that actually causes the issue i.e. Power Cut v Unsuitable Power Supply. There is always the possibility the overvoltage was far enough back to affect all 3 of their suplies, but in that case you would expect a more widespread disruption.