Why would a new development have power lines? In my country older suburbs have powerlines but everything is underground in new ones. Much more economical to do

Why would a new development have power lines? In my country older suburbs have powerlines but everything is underground in new ones. Much more economical to do it in an area before any buildings or roads are built. The newer ones are horrible for other reasons. They do tend to have smaller trees but over here that’s because everything is squeezed in to as little space as possible to maximise developer profit per square meter of land.