What does it mean when residential demand is halfway faded?

Just noticed that the green bars showing residential demand is actually partially faded out. The whole bar is filled, but a portion of the top is maybe 50% lighter than the rest. My industrial demand is also a full bar, but all the same color.

Anyone know what this means? Does it have anything to do with the region as a whole, or?


That means there is demand in your region, but not in the city (city demand is full green).

So your residential demand is at 50% locally and full regionally and you industrial demand is full within your city.