electure
You are acting as a contractor for the utility. Since the NEC does not cover installations that are part of the distribution, they do not follow the same rules that the NEC applies to other installations. They caculate the load differently than required by section 220.
They estimate the load that will occur any give n moment and size the conductor to match this estimated load. That is why they can use 4/0 AL. In this case the conductor belongs to the home owner and it should be installed according the the NEC. In my opinion 4/0 is not large enough for this load.
