He may be right. Aren't power generation facilites outside of the scope of the NEC?
It's true that any facility of that type is going to be fully designed and engineered. That said, I know for sure that power generation facilites do at least reference the NEC for the wiring inside and outside of the facilliy.
You aren't going to see the lights in the turbine rooms wired with lamp cord. Or duct banks built with plumbing pipe.