If you do a Google search on "metal + conductivity chart" you will see that
aluminum is one of the better conductors of electricity. The reason they
stopped using it in houses is because of heat cycle failure in circuits that
are switched off and on. In this type of application they will become loose
which will cause even more heat and can pose a serious fire threat. In
applications where the electricity is constantly on it is perfectly suitable
and used in many high voltage applications.

Ask at alt.engineering.electrical if you have any doubts.