Does Tera affect STAB?

Question

In showdown, I have a tera flying Kilowattrel(The team with it is going to be posted in RMT while you look). I'm wondering if there is an extra tera multiplier for it. Is there?

Answer 1

Yes, Tera does affect the STAB multiplier in this case.

If the Pokémon's Tera Type is the same as one of its original types, moves of that type receive a ×2 power boost instead of the usual ×1.5.

Source

Since Kilowattrel is an Electric/Flying type, it will get a x2 STAB boost on any Flying moves it has.