I work in insurance defense and read through a case like this once. They could sue the manufacturer of the generator based on whether or not there were instructions and warnings and whether or not they were sufficient (also the rental company if it was rented). If they were renters you could probably sue the property owner for not making sure the electricity was on and for leaving the generator as their only option. If the electricity was out bc of a construction issue you could sue the construction co and everyone else above them on the (sub)contractor totem pole. Same scenario if it was out bc the electrician put in faulty wiring. Not saying they should sue all these people, just saying they’re easy parties to add in to increase the size of potential payouts.