Electricity moves itself. You apply power on one end and it flows down the line at about the speed of light. There is literally nothing (other than superconductors) with lower marginal cost per joule transmitted than wire.
Wires never blow a tire, head gasket, or transmission - and in fact they cannot even crash into and kill people on the highway. They're just long pieces of copper or steel tied to a tower. How convenient!
If you instead compare the fixed costs, as you seem wont to do, you'll find that HV (500 kV) transmission lines and towers capable of carrying several gigawatts [1] continuously have substantially lower initial and lifetime costs per Joule-kilometre than oil pipelines, rail, trucks, tankers, or anything else that has to move oil. [2]
[1] https://www.power-technology.com/features/featurethe-worlds-...
[2] https://www.forbes.com/sites/jamesconca/2014/04/26/pick-your...