[rdiddly]

A substation fire isn't a root cause. What caused the fire?

Possibilities I know of would mostly require failure of safety measures, but would include such things as hapless squirrels & birds, problems elsewhere in the system, and yes even remote operation of substation equipment by humans in dangerous ways. (Including both incompetence and malice, though in the latter case you would have to assume the safety measures didn't fail but were overridden.)

Addendum: I'm not coming out full force in favor of a conspiracy theory, I'm coming out full force in favor of keeping an open mind, not getting overly comfortable in one's beliefs, and remembering one knows a lot less than one thinks one knows.