The choice of aluminum over copper for overhead transmission lines is driven by key practical and economic advantages. The two most significant benefits are:

• Cost-Effectiveness: Aluminum is far more abundant and less expensive than copper, which substantially reduces the overall material costs for large-scale projects.

• Weight: Aluminum is roughly one-third the weight of copper for the same electrical resistance. This allows for lighter support structures (towers) and longer spans between them, which significantly lowers infrastructure and construction costs.