The lower conductivity of Al isn't important: you just use larger wires to make up for it and get the same resistivity. Al is so cheap that it's still much che

The lower conductivity of Al isn't important: you just use larger wires to make up for it and get the same resistivity. Al is so cheap that it's still much cheaper than Cu even with thicker wires. Al also has low density, so even with thicker wires, it isn't as heavy as Cu, which is important with power lines.