Why does electricity move along wires? This is one of those questions where the answer is relatively simple—the wires are made of conductive metal—but the meaning behind the answer isn't always well-understood. Conductive metals are conductive because of things going on at the tiny scale of atoms and electrons. If you want to understand superconductivity, and what red wine has to do with any of this, you need to understand this part first.
You know how an atom is set up. There's a nucleus, made up on protons and neutrons. Electrons circle the nucleus like a cloud. In conductive metals, though, those electrons aren't tightly locked to any one nucleus. Instead, a conductive wire is a bit like an electron river, in which nuclei float like buoys. "Generating" electricity really just means "making the river flow", getting those electrons to move along from one nucleus to another. That's how electrcity is able to get from the power plant to your house.
But it's not all smooth sailing. As those electrons travel, they encounter resistance. They bump into one another, slowing down their movement like fender bender slows traffic. There are energy conversions that go along with those little collisions. Where electricity once was, you get some heat. When people talk about "line loss"—the usable energy lost to waste heat as electricity travels over power lines—this is what they're talking about. If we could conduct electricity in a more efficient way, we wouldn't have to generate as much to begin with. Read the rest