ECN Forum Forums General Topics of the Trade General Discussion Area What would've caused my power to do this?

I've seen that exact same thing - 24 volts - we had one of the phases crap out and someone in the local area went and started up a genset and backfed the current into the grid without making the proper offlodading from their genset back into the line. Another case of a know-it-all Home owner just getting things back to normal.