Well, look at your calc again. Transmission loss per my calc is actually 1 - 0.9^3 = 27.1%. At grid level, high efficient part(mainly stable industry loads) wil

Well, look at your calc again. Transmission loss per my calc is actually 1 - 0.9^3 = 27.1%. At grid level, high efficient part(mainly stable industry loads) will cover up low efficiency of household loads.