Yes. Energy is a national-security issue, and these companies need the best-quality product as quickly as possible in order to do their job.
No. If there's demand for the product and the tariffs make importing it costly, a U.S. company will start to produce it; that's the point of the tariffs.
Too hard to say in a general sense; it needs to be looked at case-by-case.
Other (please explain in the comments section).