What is the main function of a power line?

The primary function of a power line is to transmit electric power from power generation sources, such as power plants, to substations and ultimately to end-users, such as homes and businesses. This process is crucial for enabling the delivery of electricity, which is a fundamental service that supports a wide range of activities in modern life, from lighting and heating to powering appliances and industrial equipment.

In contrast, other options provide different functions that are not relevant to a power line's main purpose. For example, distributing telecommunication signals is typically handled by a different infrastructure, such as telecommunication cables or fiber-optic lines. Monitoring environmental conditions might involve sensors and equipment distinct from power lines, designed for gathering data about the atmosphere or ecology. Finally, connecting homes to a water supply involves plumbing systems and pipelines, which again are not related to the function of power lines that are solely focused on electric power transmission.