1) state factors that influence location of generating power station
2) explain why high voltages are stepped down at consumer intake point
3) reasons why balancing loads is desirable in three phase supply system

 

This sounds like a homework question.
How about you have a go at the answers first?

 

1) state factors that influence location of generating power station
2) explain why high voltages are stepped down at consumer intake point
3) reasons why balancing loads is desirable in three phase supply system

Yeah in the homework section here you are required to state your own initial solution even if it is not right, and that shows what method(s) you are using also.
Do you have any idea about any of the answers to these questions?
For example, can you at least guess why the voltage is stepped down at the consumer's end? Do you know what it means to step down a voltage?