In general, what do transmission lines primarily connect?

Transmission lines primarily serve the critical function of connecting generators to consumer loads. This role is essential in the electrical grid as it facilitates the movement of electricity generated at power plants to the end-users who require it, such as homes, businesses, and industries.

By linking generation facilities directly to loads, transmission lines ensure that there is an adequate supply of electricity where it is needed most while maintaining the efficiency of the overall power system. This connection is vital for supporting the flow of power over long distances and integrating various energy resources into the grid, whether they are renewable sources like wind and solar or conventional sources like natural gas and coal.

The other options do not encapsulate the primary purpose of transmission lines in the electricity delivery system. For example, while generators can be interconnected, transmission lines specifically prioritize the delivery to end consumers. Additionally, although transmission does involve substations, the core role of these lines is to connect generation to consumer loads directly, ensuring reliable electricity supply.