I think through civil law/tort/delict (in simple terms, someone sueing someone else) than the electricity company could potentially be sued. I think if the right person heard about it at the electricity company (i.e. not the call centre supervisor) then they would do something.
I would suggest that the fire officer should get the most senior colleugue possible to phone someone pretty senior at the electricity company (chief executive, finance director, risk/insurance manager - something like that) and point out that people might die because of their actions.
Or, if the fire service has lawyers on the pay roll, get them to send a fax to the legal department.
I'm not sure if any of this would work, but I think it might be worth trying.