1. What are the different parts (i.e. infrastructures) of "the grid" & what entities own, operate &/or regulate them?

2. (a) Why is electrical power transmitted over long-distance lines at high voltage?

(b) Specifically, consider two identical transmission lines that are delivering the same amount of power, the 1st at twice the voltage as the 2nd. Which line is most advantageous to a utility company, why is it so & by how much numerically?