essentialy no choice in putting infrastructure underground as the cost's and delays in putting a power corridor right of way through is unthinkable, they will almost certainly be useing old established locations for transformer substations that have the required set backs and other services, which must from time to time, come to the frenzied attention of developers, agast ,that they cant relieve someone of this "vacant" land
So tunneling isn't just an engineering choice, it's a planning survival strategy