Linemen are workers who specialize in the installation and maintenance of electrical power systems. They are responsible for connecting power lines to homes and businesses, as well as repairing and replacing damaged lines. The term 'linemen' can refer to two different types of workers: ENDS and wires. ENDS are responsible for connecting power lines to homes and businesses, while wires are responsible for repairing and replacing damaged lines. Finally, TES stands for Technical Electrical Services, which is a type of specialized electrical service that linemen may provide.