Quote Originally Posted by Jimaz View Post
About half of my power is out. I'm told that's likely because one of two upstream 220V lines is dead.

There are no 'upstream 220v lines'. 220V is only from the transformer on the pole to your house. Upstream from there is the wires between poles and that is usually 4,800 volts or higher. You've lost one 'leg' of that primary supply which could mean a branch laying on a wire shorting it to ground.