I think the answer has been stated: electricity has no temperature itself.
All the materials that electricity has to travel through resist the flow of electricity to some degree. That causes the electrons to jostle other
electrons in the material which is released as heat (and why your Pop Tarts get nice and golden brown: the toaster's coils are resisting the flow of
electricity and release that as heat), or, it is the right kind of material, light (or both! Which why they wanted to ban a certain type of light bulb
not realizing that people use it because
it gives off heat (keeps the eggs warm in the incubator)). If the resistance remains too high (or your
amperage, the amount of current, is way off) then you have the condition where the power cord melts; like the Pop Tarts with too much heat, if you
over supply current you get your Pop Tart flamethrower!
That explains why lightening is "hot" and causes forest fires (or nuclear fusion up in the atmosphere, in small amounts).
Superconductors (SC) are crystal structures within the electric conductor that when under special conditions (really cold temperatures) flip their
state from bein an insulator (does not conduct electricity; either that much or at all) to a conductor along the crystal edges that has no resistance.
The dream is to have a material that does this with out having to cool it down to just above absolute zero (even "high temperature" one are colder
than liquid nitrogen). Because of material resistance in the high tension power cables, they say 5 -10 % of all electricity generated is actually heat
and is never used as electricity because of resistance.
The goal is less loss of electricity through room temperature superconductor power lines. It would also be good for the environment since we would no
longer have to over produce electricity and create even more greenhouse gasses.
Chicago is currently testing "high temperature" (HT) power cables (the insulation and cooling jacket surround the HTSC allowing DC current from
renewables to reach its destination, only several hundred feet, without loss. May not seem like much but it is a start! The cooling parts are at both
ends of the cable). They started in 2018, I think, so we are still awaiting results.
ETA: I should have looked! Chicago's HTSC power cable is 3.5 KM. There are many around the world doing both AC or DC with lengths around 1,000 meters
being typical. Link
. (Has a cross-section picture of how HTSC cable is
edit on 27-1-2020 by TEOTWAWKIAIFF because: add correction and link