Well, to keep the circus aroused (myself being a carny) I've come up with an idea I personally haven't tried, surprisingly.
The idea came from the power being turned on or off as a time lapsed event. It's not instantaneous, like all the other maps.
Obviously, the only thing this fact could coincide with is the bus, as it moves around, and it's on a supposed schedule.
So, I'm gonna reach. Nah, it's only been almost 2 years, it's okay
What if the power needs to be activated at a certain time the bus is in a specific area?
There are definitely a few things that come to mind:
1) After entering the tunnel. From what I can remember, and I'm probably wrong, the driver doesn't say anything. It's also right before the diner when he says something about "blah new coordinates, hat's cool blah". Perhaps the tunnel shroud is blocking incoming transmissions and would make something something?
2) On the bridge after town. That's the only other time lapsed scenario, which is dramatically overplayed with the bridge collapsing so that everyone almost dies (but not really because it only buckles). This lead me to:
3) On the bridge after town (or darn close). I thought about the depot sign with the different times of the bus routes displayed = A & B. We all know by now about the clocks that are stuck around the map and they are stuck at 7:50ish (the others 5:10ish). If you look at Route A on that sign, there are 5 stops, all presumably corresponding to the 5 stops we all get normally, and the last one is at 6:3?pm. Based on the duration between the times on that sign, it's easy to see that by the time we get back to the Depot, it would be 8:00 = which is the beginning of Route B.
That all led me to the idea of the EMP's, and the ability to disable the bus for a short period, definitely long enough for someone to turn on power and having it be activated by the time the bus repowered itself at said different scenarios.
Seeing that we all have stretched and searched beyond practical means, this actually seems do-able and pretty relative time-wise.
If any of those three scenarios worked, I'd suspect it would be the bridge after town. EMP bus on bridge, turn on power, ____ & ____.
I believe that because of the that time displayed all over the map (7:50) right before Route B starts (8:00), which imo would start at the Depot.