Very much depend on site - especially the location of the nearest TNB pole to lay the cable to the pillar.

Here is the quotation
Cabling from pole to gate pillar (mine is just in front of my house) - TNB Contractor $1,250
Cabling from pillar to DB (underground) - Electrician $2,500 (mine i need to re-tile carporch, otherwise more cost on digging and tiling)

I was told, if the nearest pole is opposite road, then will be more costly as they will have dig the road underground to lay the cable to your house.

Anyway, I will not proceed with this as it does not give any much benefit.