Graeme 🏴@GossiTheDog Talk about single point of failure. A failed substation should be a case of switching around, power issue for an hour tops. Heathrow also had a massive battery backup - I went there as part of a battery monitoring system install, though that was 30 years ago. It was huge - a costco sized warehouse full of racks and racks of cells. I wonder if someone decided it was too expensive in the intervening years?
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