Canada

Generally military equipment ignores fuel economy - in wartime it's such a tiny expense. To what degree they try to manage it, it's to extend range. That's certainly the case for nuclear submarines, which can stay under until they run out of food, and go full steam the whole time.

But anyway, no, both diesel-electric. IIRC the government wants something soon and that existing sailors can easily learn. That's also why they're not considering building in Canada.

The Hanwha offering is bigger, meaning it's more livable and could last weeks, and it can launch ballistic missiles vertically. It's flexible, and could do a bit of the job of other submarines. The European sub is just very, very good at it's one job of ambushing surface craft (probably much better than the Hanwha boat).

We tried electric windmills, and it worked pretty well, but they failed all the hide and seek testing protocols.