Thanks for suggesting this, it does seem like a fundamental alert that is fundamentally missing!
I’ve brought it up before … and for potentially more urgent reasons I think it’s a crucial alert:
The alert equation is actually quite interesting. In the absolute sense, near 0 watts, it’s trivial (during known-daylight hours) but you can imagine anomalies like huge dark clouds being something that could initiate an alert: “Your dryer load is delayed due to weather”.