If solar panels were on a solar home built in the Southern Hemisphere, should they face north, south, east, or west? and why?

Can anyone explain to me in a simple way how solar plants and hydroelectric plants generate electricity? I've done research, but I'm a little confused. Please note, I am not asking how solar panels work. I want to know how solar PLANTS generate electricity.

I just bought a solar fencer for my horse, and was wondering if you noticed a decline in your electric bill? I bought it due to the conveince of no electirc cord running my yard all yr, can't do much about winter for the hot water tank heater, wish they would come up with a solar for that as well.

How many solar powered homes are in america and whats should we be seeing in the near future for solar houses?