Re: 5G power consumption?
"I read somewhere that 5G masts use around 1kW or something like 4 times as much as a 3/4G mast."
If you mean the actual radio power then it is usually expressed as EIRP which is 'distributed' across the whole 100 MHz, or so bandwidth, and 'directed' by the polar pattern of the antenna system. Underneath the tower power will be the same or less than at, say 30 degrees and 400 metres away and lower power at any specific frequency.
This is factors of 10 less than digital TV transponders run.