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#1

Primarily because of its lighter weight. Copper is a better conductor, but is too heavy and more expensive.

#2

Aluminium is lighter than most other metals yet still strong enough to carry its weight, so the cables do not need to be monstrously thick, and it is a fairly highly conductive material (being a metal) so power is not wasted on the transmission. It should be noted, however, that aluminum by itself is not normally used for long spans, i.e. high-voltage power transmission. It is wrapped around a steel core. The steel is used for strength, and the aluminum is used for better conductivity. Such cable is called type ACSR (short for aluminum conductor - steel reinforced).

#3

Because of its light weight. It is great at conducting a current and copper is expensive.

#4

Because of conductivity.

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