What material is commonly used for high-voltage transmission lines?

Aluminum is commonly used for high-voltage transmission lines due to its excellent electrical conductivity, lightweight properties, and resistance to corrosion. Its lower weight compared to copper allows for longer spans between transmission towers, which is advantageous in reducing the overall cost and material requirements for supporting structures. Additionally, aluminum is often reinforced with steel strands, which enhances its strength and durability, allowing it to withstand environmental factors such as wind and ice loads, making it ideal for long-distance power transmission. This combination of strength and weight allows for efficient and effective transmission of electricity over vast distances.