I have the same issue. In my city, total power capacity is higher than demand (my capacity is 286 and the demand is about 210+), and all power plants are visually connected by roads. However, at least 4 buildings still show “No Power” icons, and some power plants display red output numbers as if they are not supplying electricity. Now, my buildings are abadoned.
There are no broken roads, and the city layout is fully connected. Interestingly, when I move or rebuild a power plant, the power immediately starts working again, which suggests that the power routing was not updated correctly before.
After doing this, the buildings still sometimes keep the “No Power” bubble until I delete and rebuild a nearby road or interact with the building, which makes the icon disappear.
