I work at a generation facility. We ALWAYS apply grounding rigs to high/med voltage circuits prior to work (de-engergized of course).
This is not primiarily for re-energization protection but for "stray" voltage protection. When working with very high voltages it is easy to get an induced voltage on tagged and locked conductors.
I don't personally work the poles, but I have discussed this very topic with linemen, and they ground for re-energization. Not by the utility, but by homeowners with generators.
Ed
