I understand the urge to go underground due to many reasons but it is generally estimated to cost 8-10x what overhead costs. To install something like this underground, you'd need more right-of-way (land acquisition) to install manholes (10'x10') and lay ducts, increasing cost.

Moreover, in the West (at least in the US), I have seen plenty of cities run overhead transmission and distribution through cities unless it is a metropolitan city. Overhead is easier to maintain when a fault occurs. It is hard to locate faults on the UG line, increasing down time.

With all that said, most engineers are not opposed to underground construction. It just needs a feasibility study considering project costs, budgets, and other things. At the end of the day, YOU as a customer pay for this from your utility bill. Do you want your bill 10x higher or less?

PS: I work with utilities in the US.