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   Russ Garrett (russss@chaos.social)'s status on Wednesday, 02-Jul-2025 17:58:47 JST Russ Garrett

   Very nice report on the fire at North Hyde substation which took down Heathrow in March.

   tl;dr:

   * Fire was caused by moisture ingress in a high voltage bushing which was detected in 2018 but got lost in the system.
   * North Hyde is an ageing substation which didn't have adequate protection against spread of fire
   * Heathrow didn't think that a loss of grid feed was a plausible risk, so they assumed 10-12 hours was a reasonable recovery time from that.

   https://www.neso.energy/document/363891/download