The power loss in line is proportional to resistance and square of current. (i.e. PLOSS=I2R).
Higher voltage transmission and distribution thus would help to minimize line voltage drop in
the ratio of voltages, and the line power loss in the ratio of square of voltages. For instance, if
distribution of power is raised from 11 kV to 33 kV, the voltage drop would be lower by a factor
1/3 and the line loss would be lower by a factor (1/3)2 i.e., 1/9. Lower voltage transmission
and distribution also calls for bigger size conductor on account of current handling capacity
needed.