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An electrical transmission tower is a tall structure, typically made of steel lattice, that supports high-voltage power lines and transports large amounts of electricity over long distances from power plants to substations. These towers keep the power lines safely elevated above the ground to prevent interference from buildings and trees, while insulators prevent electricity from flowing to the tower itself. 
Key functions and characteristics

• High-voltage transmission: They carry high-voltage current (e.g., 23,000 to 765,000 volts) across long distances to meet the electrical needs of cities and towns. 
• Structural support: They are designed to support the immense weight of the power lines and withstand external forces like wind. 
• Cable suspension: The towers keep the overhead power lines at a safe height, preventing accidental contact with people, vehicles, or animals. 
• Lightning protection: Many towers have an overhead ground wire at the top to absorb or deflect lightning strikes, channeling the electricity safely to the ground. 
• Material and design: Most large towers are steel lattice structures, but smaller ones can be made of wood, concrete, or steel poles. Other designs include tubular and monopole towers, which are often used in more urban areas. 
• Versatility: Beyond electricity, some towers are also used for other purposes like supporting antennas for radio, mobile telephony, or broadcasting. 

How they work

1. Generation: Electricity is generated at power plants. 
2. Transmission: High-voltage lines are strung between transmission towers to carry the electricity to substations. 
3. Insulation: Insulators are used to attach the wires to the towers, preventing the electric current from traveling down the tower structure. 
4. Distribution: Substations then reduce the voltage to a level suitable for distribution to homes and businesses.