Answer:
A: POWER is generated at power plants that could be hydro. oil burning ,solar wind etc. all the power is transformed to hi voltage 475 kv ready for transmission interstate actually the all the states are tied together and it is called the grid. this power is collected at a sub station where it is again reduced for distribution At lower voltage yet 16kv the farther down the line it come to a pole or ground transformer where it is further reduce to 240v dual phase but only one phase is brought to the houses some power business may have 240v 2 phases brought in to save energy. All power is sold and bought from difference sources troughs out the day by power company.