Trying to see if replacing x.com with twitter.com helps w/getting the Tweet to render here:
Sign in the video is definitely visible at
Google Maps (I never paid close attention to that sign) and the SCs + WCs are further down the road, past the traffic lights.
Thanks for the pics.
In the 2nd (top right) static picture of omg_Tesla's tweet, the two white cabinets are switchgear, NOT supercharger cabinets (which are off in a group of 6 elsewhere in the parking lot).
In the 3rd (lower right) static picture, just to the right of the guy in yellow vest, the transformer doors are open. Not a great view, but looks like the 3 high voltage inputs are already removed and capped. Then further to the right is an aboveground busway from the output side of the transformer leading to the first switchgear cabinet, which has got smoke damage from the fire.
If a supercharger cabinet got a big short, the circuit breaker in the switchgear would trip, likely instantaneously (although breakers can fail), cutting off all three phases of AC input at once, so not such a spectacular fire.
But this is a fault in the wiring (bus bars?) from transformer to switchgear. The transformer/wiring to switchgear is protected with a set of fuses, which are much less sensitive than circuit breakers, and take longer to blow. And there are 3 phases here, individually fused.
Could have been a transformer fault leading to excessive voltage causing the busbar short, or a mouse/snake trying to keep warm in the switchgear, or a poorly made/poorly installed busbar/connection.
Best case is some burned up conductor (toasted small creature optional) with replacement bus bars/wire quickly available.
Worst case is transformer damage (either originally, or by excess load by short downstream) AND the busbars in switchgear cabinet torn/melted off mounts, so have to replace the whole switchgear cabinet too.