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Would we know if a suspicious cluster of human cases, that could represent the first sustained human-to-human transmission of the disease, were happening?

Video of flames at the base of an Edison transmission tower in Eaton Canyon the night the fire began raised suspicions that the utility’s equipment was at fault.

Two basic technologies are used to interconnect parts of a grid or countries - a standard transmission line that carries alternating currents, and increasingly, high voltage direct current lines.

The initial focus was to get the northern and southern power generating regions working again, which grid operator Red Eléctrica said was key to "gradually re-energising the transmission grid as the generating units are connected".

Edison has been under scrutiny since Jan. 7, when videos captured the devastating Eaton wildfire igniting under one of its transmission towers.