Point of attachment of weatherhead on the house is 12'5". As long as I maintain that height,am I responsible for what the Height of the POCO's service drop ends up crossing the driveway at?
I think you are responsible to establish a point of attachment that will keep their lines up to a specified height. We are not responsible for the poco lines per NEC however they may refuse to hook it up if your attachment point doesn't give them the clearance they require.