If you end up with a big transformer you have to take into account the losses in magnetizing current of the TX core, which is energized 24/7.

Even at say 50 Watts for an 6 kVA TX it adds up to a quit bit of extra power usage.

1.2 kWh day
438 kWh year

That is for the TX only !

The product of rotation, excitation and flux produces electricty.