@masam I don't think that the version of firmware (20.49.0) has that 'Tesla Virtual Power Plant' feature in the 'Power Flow'; when I tap on the version # in the app, I see a May 2021 (21.13.2) version but that's supposedly only "selected regions".
So we don't get any notification of an upcoming event? My understanding is that you're supposed to so that you can opt out, if desired.
And when you say 'backup mode', may I assume that you're referring to the 'Backup-Only' mode under 'Customize'? I ask because a friend posted a similar question on a FB group and the reply there was that backup only mode precludes participation in Connected Solutions (similar to how it won't go below 20% or whatever in Self-Powered).