> taxed electricity exports

it is easy to tax exports, but this makes the export less profitable (for the entity making that export). Unless you mean the producer raises prices to cover the new tax - in which case, the export is now more expensive, and less of it gets exported.

It doesn't really help with the tariff situation much in any case - a political problem requires a political solution (such as reciprocal tariffs). Both sides hurt, and there's no good outcome.