I recently read a chapter on power system analysis in a book and I have some questions. 1) The three phase power at the secondary distribution level is unbalanced i.e. not equal for each phase but it is nearly balanced at the HV transmission level. Is this true? Also, is the power balanced at the generator end? Basically, is there a difference in degree of balancing between transmission and distribution? 2) In the distribution network, there are a lot of power electronic and electronic loads which lead to distorting current waveforms and hence, harmonic content of the distribution network current is very high. Are these harmonics mitigated at the transmission level using filters? Is the transmission current almost sinusoidal? If no, then where is mitigation of the harmonics carried out? Thanks a lot in advance!