I vaguely remember an incident back in the late 90’s on one of our 777s. They were minding their own business in the cruise when they stated getting EICAS advisories for lesser-known utilities. This turned quite rapidly into cautions, with many of the aircraft’s electrically powered systems going off line, to the point that it was looking pretty serious. I can’t recall how they got most of them back but the root cause was established later as being an ELMS failure. Interesting as it was still functioning but had a problem with some kind of feedback, so was load shedding on the basis of too much demand but carried on until it had turned off everything it could...