The only (perceived) problem you might have with the PoCo is on the drop/lateral - they'll size to their estimation of demand, as opposed to your Code requirement calculated conductor size. Just remember, they operate under a different book than we do.
A customer of mine wanted the ITE Pushmatic 8 spot panels on each side of his duplex upgraded to 200A modern panels (30 space GE) each when he added AC to the units. The AHJ allowed me (based on his load calc) to run 3/0 (maybe it was 2/0) up the riser, but the PoCo left the existing drop alone, stating that they didn't see enough of an increase in demand to warrant a change in conductors.
[This message has been edited by DougW (edited 11-20-2005).]